tkCanvLine.c
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上传日期:2015-12-11
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- /*
- * tkCanvLine.c --
- *
- * This file implements line items for canvas widgets.
- *
- * Copyright (c) 1991-1994 The Regents of the University of California.
- * Copyright (c) 1994-1997 Sun Microsystems, Inc.
- * Copyright (c) 1998-1999 by Scriptics Corporation.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tkCanvLine.c,v 1.13.2.2 2006/10/16 15:35:50 das Exp $
- */
- #include <stdio.h>
- #include "tkInt.h"
- #include "tkPort.h"
- #include "tkCanvas.h"
- /*
- * The structure below defines the record for each line item.
- */
- typedef enum {
- ARROWS_NONE, ARROWS_FIRST, ARROWS_LAST, ARROWS_BOTH
- } Arrows;
- typedef struct LineItem {
- Tk_Item header; /* Generic stuff that's the same for all
- * types. MUST BE FIRST IN STRUCTURE. */
- Tk_Outline outline; /* Outline structure */
- Tk_Canvas canvas; /* Canvas containing item. Needed for
- * parsing arrow shapes. */
- int numPoints; /* Number of points in line (always >= 0). */
- double *coordPtr; /* Pointer to malloc-ed array containing
- * x- and y-coords of all points in line.
- * X-coords are even-valued indices, y-coords
- * are corresponding odd-valued indices. If
- * the line has arrowheads then the first
- * and last points have been adjusted to refer
- * to the necks of the arrowheads rather than
- * their tips. The actual endpoints are
- * stored in the *firstArrowPtr and
- * *lastArrowPtr, if they exist. */
- int capStyle; /* Cap style for line. */
- int joinStyle; /* Join style for line. */
- GC arrowGC; /* Graphics context for drawing arrowheads. */
- Arrows arrow; /* Indicates whether or not to draw arrowheads:
- * "none", "first", "last", or "both". */
- float arrowShapeA; /* Distance from tip of arrowhead to center. */
- float arrowShapeB; /* Distance from tip of arrowhead to trailing
- * point, measured along shaft. */
- float arrowShapeC; /* Distance of trailing points from outside
- * edge of shaft. */
- double *firstArrowPtr; /* Points to array of PTS_IN_ARROW points
- * describing polygon for arrowhead at first
- * point in line. First point of arrowhead
- * is tip. Malloc'ed. NULL means no arrowhead
- * at first point. */
- double *lastArrowPtr; /* Points to polygon for arrowhead at last
- * point in line (PTS_IN_ARROW points, first
- * of which is tip). Malloc'ed. NULL means
- * no arrowhead at last point. */
- Tk_SmoothMethod *smooth; /* Non-zero means draw line smoothed (i.e.
- * with Bezier splines). */
- int splineSteps; /* Number of steps in each spline segment. */
- } LineItem;
- /*
- * Number of points in an arrowHead:
- */
- #define PTS_IN_ARROW 6
- /*
- * Prototypes for procedures defined in this file:
- */
- static int ArrowheadPostscript _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, LineItem *linePtr,
- double *arrowPtr));
- static void ComputeLineBbox _ANSI_ARGS_((Tk_Canvas canvas,
- LineItem *linePtr));
- static int ConfigureLine _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
- Tcl_Obj *CONST objv[], int flags));
- static int ConfigureArrows _ANSI_ARGS_((Tk_Canvas canvas,
- LineItem *linePtr));
- static int CreateLine _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, struct Tk_Item *itemPtr,
- int objc, Tcl_Obj *CONST objv[]));
- static void DeleteLine _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display));
- static void DisplayLine _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, Display *display, Drawable dst,
- int x, int y, int width, int height));
- static int GetLineIndex _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr,
- Tcl_Obj *obj, int *indexPtr));
- static int LineCoords _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr,
- int objc, Tcl_Obj *CONST objv[]));
- static void LineDeleteCoords _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, int first, int last));
- static void LineInsert _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj));
- static int LineToArea _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *rectPtr));
- static double LineToPoint _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double *coordPtr));
- static int LineToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
- Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
- static int ArrowParseProc _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, Tk_Window tkwin,
- CONST char *value, char *recordPtr, int offset));
- static char * ArrowPrintProc _ANSI_ARGS_((ClientData clientData,
- Tk_Window tkwin, char *recordPtr, int offset,
- Tcl_FreeProc **freeProcPtr));
- static int ParseArrowShape _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, Tk_Window tkwin,
- CONST char *value, char *recordPtr, int offset));
- static char * PrintArrowShape _ANSI_ARGS_((ClientData clientData,
- Tk_Window tkwin, char *recordPtr, int offset,
- Tcl_FreeProc **freeProcPtr));
- static void ScaleLine _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double originX, double originY,
- double scaleX, double scaleY));
- static void TranslateLine _ANSI_ARGS_((Tk_Canvas canvas,
- Tk_Item *itemPtr, double deltaX, double deltaY));
- /*
- * Information used for parsing configuration specs. If you change any
- * of the default strings, be sure to change the corresponding default
- * values in CreateLine.
- */
- static Tk_CustomOption arrowShapeOption = {
- (Tk_OptionParseProc *) ParseArrowShape,
- PrintArrowShape, (ClientData) NULL
- };
- static Tk_CustomOption arrowOption = {
- (Tk_OptionParseProc *) ArrowParseProc,
- ArrowPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption smoothOption = {
- (Tk_OptionParseProc *) TkSmoothParseProc,
- TkSmoothPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption stateOption = {
- (Tk_OptionParseProc *) TkStateParseProc,
- TkStatePrintProc, (ClientData) 2
- };
- static Tk_CustomOption tagsOption = {
- (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
- Tk_CanvasTagsPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption dashOption = {
- (Tk_OptionParseProc *) TkCanvasDashParseProc,
- TkCanvasDashPrintProc, (ClientData) NULL
- };
- static Tk_CustomOption offsetOption = {
- (Tk_OptionParseProc *) TkOffsetParseProc,
- TkOffsetPrintProc,
- (ClientData) (TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
- };
- static Tk_CustomOption pixelOption = {
- (Tk_OptionParseProc *) TkPixelParseProc,
- TkPixelPrintProc, (ClientData) NULL
- };
- static Tk_ConfigSpec configSpecs[] = {
- {TK_CONFIG_CUSTOM, "-activedash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.activeDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.activeColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.activeStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-activewidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(LineItem, outline.activeWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_CUSTOM, "-arrow", (char *) NULL, (char *) NULL,
- "none", Tk_Offset(LineItem, arrow), TK_CONFIG_DONT_SET_DEFAULT, &arrowOption},
- {TK_CONFIG_CUSTOM, "-arrowshape", (char *) NULL, (char *) NULL,
- "8 10 3", Tk_Offset(LineItem, arrowShapeA),
- TK_CONFIG_DONT_SET_DEFAULT, &arrowShapeOption},
- {TK_CONFIG_CAP_STYLE, "-capstyle", (char *) NULL, (char *) NULL,
- "butt", Tk_Offset(LineItem, capStyle), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
- "black", Tk_Offset(LineItem, outline.color), TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-dash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.dash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_PIXELS, "-dashoffset", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(LineItem, outline.offset),
- TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-disableddash", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.disabledDash),
- TK_CONFIG_NULL_OK, &dashOption},
- {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.disabledColor),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.disabledStipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-disabledwidth", (char *) NULL, (char *) NULL,
- "0.0", Tk_Offset(LineItem, outline.disabledWidth),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_JOIN_STYLE, "-joinstyle", (char *) NULL, (char *) NULL,
- "round", Tk_Offset(LineItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
- "0,0", Tk_Offset(LineItem, outline.tsoffset),
- TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
- {TK_CONFIG_CUSTOM, "-smooth", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(LineItem, smooth),
- TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
- {TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
- "12", Tk_Offset(LineItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
- &stateOption},
- {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(LineItem, outline.stipple),
- TK_CONFIG_NULL_OK},
- {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
- (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
- {TK_CONFIG_CUSTOM, "-width", (char *) NULL, (char *) NULL,
- "1.0", Tk_Offset(LineItem, outline.width),
- TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
- {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
- (char *) NULL, 0, 0}
- };
- /*
- * The structures below defines the line item type by means
- * of procedures that can be invoked by generic item code.
- */
- Tk_ItemType tkLineType = {
- "line", /* name */
- sizeof(LineItem), /* itemSize */
- CreateLine, /* createProc */
- configSpecs, /* configSpecs */
- ConfigureLine, /* configureProc */
- LineCoords, /* coordProc */
- DeleteLine, /* deleteProc */
- DisplayLine, /* displayProc */
- TK_CONFIG_OBJS, /* flags */
- LineToPoint, /* pointProc */
- LineToArea, /* areaProc */
- LineToPostscript, /* postscriptProc */
- ScaleLine, /* scaleProc */
- TranslateLine, /* translateProc */
- (Tk_ItemIndexProc *) GetLineIndex, /* indexProc */
- (Tk_ItemCursorProc *) NULL, /* icursorProc */
- (Tk_ItemSelectionProc *) NULL, /* selectionProc */
- (Tk_ItemInsertProc *) LineInsert, /* insertProc */
- LineDeleteCoords, /* dTextProc */
- (Tk_ItemType *) NULL, /* nextPtr */
- };
- /*
- * The definition below determines how large are static arrays
- * used to hold spline points (splines larger than this have to
- * have their arrays malloc-ed).
- */
- #define MAX_STATIC_POINTS 200
- /*
- *--------------------------------------------------------------
- *
- * CreateLine --
- *
- * This procedure is invoked to create a new line item in
- * a canvas.
- *
- * Results:
- * A standard Tcl return value. If an error occurred in
- * creating the item, then an error message is left in
- * the interp's result; in this case itemPtr is left uninitialized,
- * so it can be safely freed by the caller.
- *
- * Side effects:
- * A new line item is created.
- *
- *--------------------------------------------------------------
- */
- static int
- CreateLine(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Interpreter for error reporting. */
- Tk_Canvas canvas; /* Canvas to hold new item. */
- Tk_Item *itemPtr; /* Record to hold new item; header
- * has been initialized by caller. */
- int objc; /* Number of arguments in objv. */
- Tcl_Obj *CONST objv[]; /* Arguments describing line. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- int i;
- if (objc == 0) {
- panic("canvas did not pass any coordsn");
- }
- /*
- * Carry out initialization that is needed to set defaults and to
- * allow proper cleanup after errors during the the remainder of
- * this procedure.
- */
- Tk_CreateOutline(&(linePtr->outline));
- linePtr->canvas = canvas;
- linePtr->numPoints = 0;
- linePtr->coordPtr = NULL;
- linePtr->capStyle = CapButt;
- linePtr->joinStyle = JoinRound;
- linePtr->arrowGC = None;
- linePtr->arrow = ARROWS_NONE;
- linePtr->arrowShapeA = (float)8.0;
- linePtr->arrowShapeB = (float)10.0;
- linePtr->arrowShapeC = (float)3.0;
- linePtr->firstArrowPtr = NULL;
- linePtr->lastArrowPtr = NULL;
- linePtr->smooth = (Tk_SmoothMethod *) NULL;
- linePtr->splineSteps = 12;
- /*
- * Count the number of points and then parse them into a point
- * array. Leading arguments are assumed to be points if they
- * start with a digit or a minus sign followed by a digit.
- */
- for (i = 1; i < objc; i++) {
- char *arg = Tcl_GetString(objv[i]);
- if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
- break;
- }
- }
- if (LineCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
- goto error;
- }
- if (ConfigureLine(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
- return TCL_OK;
- }
- error:
- DeleteLine(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
- return TCL_ERROR;
- }
- /*
- *--------------------------------------------------------------
- *
- * LineCoords --
- *
- * This procedure is invoked to process the "coords" widget
- * command on lines. See the user documentation for details
- * on what it does.
- *
- * Results:
- * Returns TCL_OK or TCL_ERROR, and sets the interp's result.
- *
- * Side effects:
- * The coordinates for the given item may be changed.
- *
- *--------------------------------------------------------------
- */
- static int
- LineCoords(interp, canvas, itemPtr, objc, objv)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item whose coordinates are to be
- * read or modified. */
- int objc; /* Number of coordinates supplied in
- * objv. */
- Tcl_Obj *CONST objv[]; /* Array of coordinates: x1, y1,
- * x2, y2, ... */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- int i, numPoints;
- double *coordPtr;
- if (objc == 0) {
- int numCoords;
- Tcl_Obj *subobj, *obj = Tcl_NewObj();
- numCoords = 2*linePtr->numPoints;
- if (linePtr->firstArrowPtr != NULL) {
- coordPtr = linePtr->firstArrowPtr;
- } else {
- coordPtr = linePtr->coordPtr;
- }
- for (i = 0; i < numCoords; i++, coordPtr++) {
- if (i == 2) {
- coordPtr = linePtr->coordPtr+2;
- }
- if ((linePtr->lastArrowPtr != NULL) && (i == (numCoords-2))) {
- coordPtr = linePtr->lastArrowPtr;
- }
- subobj = Tcl_NewDoubleObj(*coordPtr);
- Tcl_ListObjAppendElement(interp, obj, subobj);
- }
- Tcl_SetObjResult(interp, obj);
- return TCL_OK;
- }
- if (objc == 1) {
- if (Tcl_ListObjGetElements(interp, objv[0], &objc,
- (Tcl_Obj ***) &objv) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- if (objc & 1) {
- char buf[64 + TCL_INTEGER_SPACE];
- sprintf(buf, "wrong # coordinates: expected an even number, got %d",
- objc);
- Tcl_SetResult(interp, buf, TCL_VOLATILE);
- return TCL_ERROR;
- } else if (objc < 4) {
- char buf[64 + TCL_INTEGER_SPACE];
- sprintf(buf, "wrong # coordinates: expected at least 4, got %d", objc);
- Tcl_SetResult(interp, buf, TCL_VOLATILE);
- return TCL_ERROR;
- } else {
- numPoints = objc/2;
- if (linePtr->numPoints != numPoints) {
- coordPtr = (double *) ckalloc((unsigned)
- (sizeof(double) * objc));
- if (linePtr->coordPtr != NULL) {
- ckfree((char *) linePtr->coordPtr);
- }
- linePtr->coordPtr = coordPtr;
- linePtr->numPoints = numPoints;
- }
- coordPtr = linePtr->coordPtr;
- for (i = 0; i <objc; i++) {
- if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
- coordPtr++) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- /*
- * Update arrowheads by throwing away any existing arrow-head
- * information and calling ConfigureArrows to recompute it.
- */
- if (linePtr->firstArrowPtr != NULL) {
- ckfree((char *) linePtr->firstArrowPtr);
- linePtr->firstArrowPtr = NULL;
- }
- if (linePtr->lastArrowPtr != NULL) {
- ckfree((char *) linePtr->lastArrowPtr);
- linePtr->lastArrowPtr = NULL;
- }
- if (linePtr->arrow != ARROWS_NONE) {
- ConfigureArrows(canvas, linePtr);
- }
- ComputeLineBbox(canvas, linePtr);
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * ConfigureLine --
- *
- * This procedure is invoked to configure various aspects
- * of a line item such as its background color.
- *
- * Results:
- * A standard Tcl result code. If an error occurs, then
- * an error message is left in the interp's result.
- *
- * Side effects:
- * Configuration information, such as colors and stipple
- * patterns, may be set for itemPtr.
- *
- *--------------------------------------------------------------
- */
- static int
- ConfigureLine(interp, canvas, itemPtr, objc, objv, flags)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing itemPtr. */
- Tk_Item *itemPtr; /* Line item to reconfigure. */
- int objc; /* Number of elements in objv. */
- Tcl_Obj *CONST objv[]; /* Arguments describing things to configure. */
- int flags; /* Flags to pass to Tk_ConfigureWidget. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- XGCValues gcValues;
- GC newGC, arrowGC;
- unsigned long mask;
- Tk_Window tkwin;
- Tk_State state;
- tkwin = Tk_CanvasTkwin(canvas);
- if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
- (CONST char **) objv, (char *) linePtr, flags|TK_CONFIG_OBJS)) {
- return TCL_ERROR;
- }
- /*
- * A few of the options require additional processing, such as
- * graphics contexts.
- */
- state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (linePtr->outline.activeWidth > linePtr->outline.width ||
- linePtr->outline.activeDash.number != 0 ||
- linePtr->outline.activeColor != NULL ||
- linePtr->outline.activeStipple != None) {
- itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
- } else {
- itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
- }
- mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr,
- &(linePtr->outline));
- if (mask) {
- if (linePtr->arrow == ARROWS_NONE) {
- gcValues.cap_style = linePtr->capStyle;
- mask |= GCCapStyle;
- }
- gcValues.join_style = linePtr->joinStyle;
- mask |= GCJoinStyle;
- newGC = Tk_GetGC(tkwin, mask, &gcValues);
- #ifdef MAC_OSX_TK
- /*
- * Mac OS X CG drawing needs access to linewidth even for
- * arrow fills (as linewidth controls antialiasing).
- */
- mask |= GCLineWidth;
- #else
- gcValues.line_width = 0;
- #endif
- arrowGC = Tk_GetGC(tkwin, mask, &gcValues);
- } else {
- newGC = arrowGC = None;
- }
- if (linePtr->outline.gc != None) {
- Tk_FreeGC(Tk_Display(tkwin), linePtr->outline.gc);
- }
- if (linePtr->arrowGC != None) {
- Tk_FreeGC(Tk_Display(tkwin), linePtr->arrowGC);
- }
- linePtr->outline.gc = newGC;
- linePtr->arrowGC = arrowGC;
- /*
- * Keep spline parameters within reasonable limits.
- */
- if (linePtr->splineSteps < 1) {
- linePtr->splineSteps = 1;
- } else if (linePtr->splineSteps > 100) {
- linePtr->splineSteps = 100;
- }
- if ((!linePtr->numPoints) || (state==TK_STATE_HIDDEN)) {
- ComputeLineBbox(canvas, linePtr);
- return TCL_OK;
- }
- /*
- * Setup arrowheads, if needed. If arrowheads are turned off,
- * restore the line's endpoints (they were shortened when the
- * arrowheads were added).
- */
- if ((linePtr->firstArrowPtr != NULL) && (linePtr->arrow != ARROWS_FIRST)
- && (linePtr->arrow != ARROWS_BOTH)) {
- linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
- linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
- ckfree((char *) linePtr->firstArrowPtr);
- linePtr->firstArrowPtr = NULL;
- }
- if ((linePtr->lastArrowPtr != NULL) && (linePtr->arrow != ARROWS_LAST)
- && (linePtr->arrow != ARROWS_BOTH)) {
- int i;
- i = 2*(linePtr->numPoints-1);
- linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
- linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
- ckfree((char *) linePtr->lastArrowPtr);
- linePtr->lastArrowPtr = NULL;
- }
- if (linePtr->arrow != ARROWS_NONE) {
- ConfigureArrows(canvas, linePtr);
- }
- /*
- * Recompute bounding box for line.
- */
- ComputeLineBbox(canvas, linePtr);
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * DeleteLine --
- *
- * This procedure is called to clean up the data structure
- * associated with a line item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Resources associated with itemPtr are released.
- *
- *--------------------------------------------------------------
- */
- static void
- DeleteLine(canvas, itemPtr, display)
- Tk_Canvas canvas; /* Info about overall canvas widget. */
- Tk_Item *itemPtr; /* Item that is being deleted. */
- Display *display; /* Display containing window for
- * canvas. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- Tk_DeleteOutline(display, &(linePtr->outline));
- if (linePtr->coordPtr != NULL) {
- ckfree((char *) linePtr->coordPtr);
- }
- if (linePtr->arrowGC != None) {
- Tk_FreeGC(display, linePtr->arrowGC);
- }
- if (linePtr->firstArrowPtr != NULL) {
- ckfree((char *) linePtr->firstArrowPtr);
- }
- if (linePtr->lastArrowPtr != NULL) {
- ckfree((char *) linePtr->lastArrowPtr);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * ComputeLineBbox --
- *
- * This procedure is invoked to compute the bounding box of
- * all the pixels that may be drawn as part of a line.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The fields x1, y1, x2, and y2 are updated in the header
- * for itemPtr.
- *
- *--------------------------------------------------------------
- */
- static void
- ComputeLineBbox(canvas, linePtr)
- Tk_Canvas canvas; /* Canvas that contains item. */
- LineItem *linePtr; /* Item whose bbos is to be
- * recomputed. */
- {
- double *coordPtr;
- int i, intWidth;
- double width;
- Tk_State state = linePtr->header.state;
- Tk_TSOffset *tsoffset;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (!(linePtr->numPoints) || (state==TK_STATE_HIDDEN)) {
- linePtr->header.x1 = -1;
- linePtr->header.x2 = -1;
- linePtr->header.y1 = -1;
- linePtr->header.y2 = -1;
- return;
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- coordPtr = linePtr->coordPtr;
- linePtr->header.x1 = linePtr->header.x2 = (int) *coordPtr;
- linePtr->header.y1 = linePtr->header.y2 = (int) coordPtr[1];
- /*
- * Compute the bounding box of all the points in the line,
- * then expand in all directions by the line's width to take
- * care of butting or rounded corners and projecting or
- * rounded caps. This expansion is an overestimate (worst-case
- * is square root of two over two) but it's simple. Don't do
- * anything special for curves. This causes an additional
- * overestimate in the bounding box, but is faster.
- */
- for (i = 1, coordPtr = linePtr->coordPtr+2; i < linePtr->numPoints;
- i++, coordPtr += 2) {
- TkIncludePoint((Tk_Item *) linePtr, coordPtr);
- }
- width = linePtr->outline.width;
- if (width < 1.0) {
- width = 1.0;
- }
- if (linePtr->arrow != ARROWS_NONE) {
- if (linePtr->arrow != ARROWS_LAST) {
- TkIncludePoint((Tk_Item *) linePtr, linePtr->firstArrowPtr);
- }
- if (linePtr->arrow != ARROWS_FIRST) {
- TkIncludePoint((Tk_Item *) linePtr, linePtr->lastArrowPtr);
- }
- }
- tsoffset = &linePtr->outline.tsoffset;
- if (tsoffset->flags & TK_OFFSET_INDEX) {
- double *coordPtr = linePtr->coordPtr + (tsoffset->flags & ~TK_OFFSET_INDEX);
- if (tsoffset->flags <= 0) {
- coordPtr = linePtr->coordPtr;
- if ((linePtr->arrow == ARROWS_FIRST) || (linePtr->arrow == ARROWS_BOTH)) {
- coordPtr = linePtr->firstArrowPtr;
- }
- }
- if (tsoffset->flags > (linePtr->numPoints * 2)) {
- coordPtr = linePtr->coordPtr + (linePtr->numPoints * 2);
- if ((linePtr->arrow == ARROWS_LAST) || (linePtr->arrow == ARROWS_BOTH)) {
- coordPtr = linePtr->lastArrowPtr;
- }
- }
- tsoffset->xoffset = (int) (coordPtr[0] + 0.5);
- tsoffset->yoffset = (int) (coordPtr[1] + 0.5);
- } else {
- if (tsoffset->flags & TK_OFFSET_LEFT) {
- tsoffset->xoffset = linePtr->header.x1;
- } else if (tsoffset->flags & TK_OFFSET_CENTER) {
- tsoffset->xoffset = (linePtr->header.x1 + linePtr->header.x2)/2;
- } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
- tsoffset->xoffset = linePtr->header.x2;
- }
- if (tsoffset->flags & TK_OFFSET_TOP) {
- tsoffset->yoffset = linePtr->header.y1;
- } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
- tsoffset->yoffset = (linePtr->header.y1 + linePtr->header.y2)/2;
- } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
- tsoffset->yoffset = linePtr->header.y2;
- }
- }
- intWidth = (int) (width + 0.5);
- linePtr->header.x1 -= intWidth;
- linePtr->header.x2 += intWidth;
- linePtr->header.y1 -= intWidth;
- linePtr->header.y2 += intWidth;
- if (linePtr->numPoints==1) {
- linePtr->header.x1 -= 1;
- linePtr->header.x2 += 1;
- linePtr->header.y1 -= 1;
- linePtr->header.y2 += 1;
- return;
- }
- /*
- * For mitered lines, make a second pass through all the points.
- * Compute the locations of the two miter vertex points and add
- * those into the bounding box.
- */
- if (linePtr->joinStyle == JoinMiter) {
- for (i = linePtr->numPoints, coordPtr = linePtr->coordPtr; i >= 3;
- i--, coordPtr += 2) {
- double miter[4];
- int j;
-
- if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
- width, miter, miter+2)) {
- for (j = 0; j < 4; j += 2) {
- TkIncludePoint((Tk_Item *) linePtr, miter+j);
- }
- }
- }
- }
- /*
- * Add in the sizes of arrowheads, if any.
- */
- if (linePtr->arrow != ARROWS_NONE) {
- if (linePtr->arrow != ARROWS_LAST) {
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint((Tk_Item *) linePtr, coordPtr);
- }
- }
- if (linePtr->arrow != ARROWS_FIRST) {
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint((Tk_Item *) linePtr, coordPtr);
- }
- }
- }
- /*
- * Add one more pixel of fudge factor just to be safe (e.g.
- * X may round differently than we do).
- */
- linePtr->header.x1 -= 1;
- linePtr->header.x2 += 1;
- linePtr->header.y1 -= 1;
- linePtr->header.y2 += 1;
- }
- /*
- *--------------------------------------------------------------
- *
- * DisplayLine --
- *
- * This procedure is invoked to draw a line item in a given
- * drawable.
- *
- * Results:
- * None.
- *
- * Side effects:
- * ItemPtr is drawn in drawable using the transformation
- * information in canvas.
- *
- *--------------------------------------------------------------
- */
- static void
- DisplayLine(canvas, itemPtr, display, drawable, x, y, width, height)
- Tk_Canvas canvas; /* Canvas that contains item. */
- Tk_Item *itemPtr; /* Item to be displayed. */
- Display *display; /* Display on which to draw item. */
- Drawable drawable; /* Pixmap or window in which to draw
- * item. */
- int x, y, width, height; /* Describes region of canvas that
- * must be redisplayed (not used). */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- XPoint staticPoints[MAX_STATIC_POINTS*3];
- XPoint *pointPtr;
- double linewidth;
- int numPoints;
- Tk_State state = itemPtr->state;
- Pixmap stipple = linePtr->outline.stipple;
- if ((!linePtr->numPoints)||(linePtr->outline.gc==None)) {
- return;
- }
- if (state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- linewidth = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeStipple != None) {
- stipple = linePtr->outline.activeStipple;
- }
- if (linePtr->outline.activeWidth != linewidth) {
- linewidth = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledStipple != None) {
- stipple = linePtr->outline.disabledStipple;
- }
- if (linePtr->outline.disabledWidth != linewidth) {
- linewidth = linePtr->outline.disabledWidth;
- }
- }
- /*
- * Build up an array of points in screen coordinates. Use a
- * static array unless the line has an enormous number of points;
- * in this case, dynamically allocate an array. For smoothed lines,
- * generate the curve points on each redisplay.
- */
- if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
- numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- } else {
- numPoints = linePtr->numPoints;
- }
- if (numPoints <= MAX_STATIC_POINTS) {
- pointPtr = staticPoints;
- } else {
- pointPtr = (XPoint *)ckalloc((unsigned)(numPoints * 3*sizeof(XPoint)));
- }
- if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
- numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
- linePtr->numPoints, linePtr->splineSteps, pointPtr,
- (double *) NULL);
- } else {
- numPoints = TkCanvTranslatePath((TkCanvas*)canvas, numPoints,
- linePtr->coordPtr, 0, pointPtr);
- }
- /*
- * Display line, the free up line storage if it was dynamically
- * allocated. If we're stippling, then modify the stipple offset
- * in the GC. Be sure to reset the offset when done, since the
- * GC is supposed to be read-only.
- */
- if (Tk_ChangeOutlineGC(canvas, itemPtr, &(linePtr->outline))) {
- Tk_CanvasSetOffset(canvas, linePtr->arrowGC, &linePtr->outline.tsoffset);
- }
- if (numPoints>1) {
- XDrawLines(display, drawable, linePtr->outline.gc, pointPtr, numPoints,
- CoordModeOrigin);
- } else {
- int intwidth = (int) (linewidth + 0.5);
- if (intwidth<1) {
- intwidth=1;
- }
- XFillArc(display, drawable, linePtr->outline.gc,
- pointPtr->x - intwidth/2, pointPtr->y - intwidth/2,
- (unsigned int)intwidth+1, (unsigned int)intwidth+1, 0, 64*360);
- }
- if (pointPtr != staticPoints) {
- ckfree((char *) pointPtr);
- }
- /*
- * Display arrowheads, if they are wanted.
- */
- if (linePtr->firstArrowPtr != NULL) {
- TkFillPolygon(canvas, linePtr->firstArrowPtr, PTS_IN_ARROW,
- display, drawable, linePtr->arrowGC, NULL);
- }
- if (linePtr->lastArrowPtr != NULL) {
- TkFillPolygon(canvas, linePtr->lastArrowPtr, PTS_IN_ARROW,
- display, drawable, linePtr->arrowGC, NULL);
- }
- if (Tk_ResetOutlineGC(canvas, itemPtr, &(linePtr->outline))) {
- XSetTSOrigin(display, linePtr->arrowGC, 0, 0);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * LineInsert --
- *
- * Insert coords into a line item at a given index.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The coords in the given item is modified.
- *
- *--------------------------------------------------------------
- */
- static void
- LineInsert(canvas, itemPtr, beforeThis, obj)
- Tk_Canvas canvas; /* Canvas containing text item. */
- Tk_Item *itemPtr; /* Line item to be modified. */
- int beforeThis; /* Index before which new coordinates
- * are to be inserted. */
- Tcl_Obj *obj; /* New coordinates to be inserted. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- int length, objc, i;
- double *new, *coordPtr;
- Tk_State state = itemPtr->state;
- Tcl_Obj **objv;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- if (!obj || (Tcl_ListObjGetElements((Tcl_Interp *) NULL, obj, &objc, &objv) != TCL_OK)
- || !objc || objc&1) {
- return;
- }
- length = 2*linePtr->numPoints;
- if (beforeThis < 0) {
- beforeThis = 0;
- }
- if (beforeThis > length) {
- beforeThis = length;
- }
- if (linePtr->firstArrowPtr != NULL) {
- linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
- linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
- }
- if (linePtr->lastArrowPtr != NULL) {
- linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
- linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
- }
- new = (double *) ckalloc((unsigned)(sizeof(double) * (length + objc)));
- for(i=0; i<beforeThis; i++) {
- new[i] = linePtr->coordPtr[i];
- }
- for(i=0; i<objc; i++) {
- if (Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,objv[i],
- new+(i+beforeThis))!=TCL_OK) {
- Tcl_ResetResult(((TkCanvas *)canvas)->interp);
- ckfree((char *) new);
- return;
- }
- }
- for(i=beforeThis; i<length; i++) {
- new[i+objc] = linePtr->coordPtr[i];
- }
- if(linePtr->coordPtr) ckfree((char *)linePtr->coordPtr);
- linePtr->coordPtr = new;
- linePtr->numPoints = (length + objc)/2;
- if ((length>3) && (state != TK_STATE_HIDDEN)) {
- /*
- * This is some optimizing code that will result that only the part
- * of the polygon that changed (and the objects that are overlapping
- * with that part) need to be redrawn. A special flag is set that
- * instructs the general canvas code not to redraw the whole
- * object. If this flag is not set, the canvas will do the redrawing,
- * otherwise I have to do it here.
- */
- itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
- if (beforeThis>0) {beforeThis -= 2; objc+=2; }
- if ((beforeThis+objc)<length) objc+=2;
- if (linePtr->smooth) {
- if(beforeThis>0) {
- beforeThis-=2; objc+=2;
- }
- if((beforeThis+objc+2)<length) {
- objc+=2;
- }
- }
- itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[beforeThis];
- itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[beforeThis+1];
- if ((linePtr->firstArrowPtr != NULL) && (beforeThis<1)) {
- /* include old first arrow */
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- if ((linePtr->lastArrowPtr != NULL) && ((beforeThis+objc)>=length)) {
- /* include old last arrow */
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- coordPtr = linePtr->coordPtr+beforeThis+2;
- for(i=2; i<objc; i+=2) {
- TkIncludePoint(itemPtr, coordPtr);
- coordPtr+=2;
- }
- }
- if (linePtr->firstArrowPtr != NULL) {
- ckfree((char *) linePtr->firstArrowPtr);
- linePtr->firstArrowPtr = NULL;
- }
- if (linePtr->lastArrowPtr != NULL) {
- ckfree((char *) linePtr->lastArrowPtr);
- linePtr->lastArrowPtr = NULL;
- }
- if (linePtr->arrow != ARROWS_NONE) {
- ConfigureArrows(canvas, linePtr);
- }
- if(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
- double width;
- int intWidth;
- if ((linePtr->firstArrowPtr != NULL) && (beforeThis>2)) {
- /* include new first arrow */
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- if ((linePtr->lastArrowPtr != NULL) && ((beforeThis+objc)<(length-2))) {
- /* include new right arrow */
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- intWidth = (int) (width + 0.5);
- if (intWidth < 1) {
- intWidth = 1;
- }
- itemPtr->x1 -= intWidth; itemPtr->y1 -= intWidth;
- itemPtr->x2 += intWidth; itemPtr->y2 += intWidth;
- Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
- itemPtr->x2, itemPtr->y2);
- }
- ComputeLineBbox(canvas, linePtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * LineDeleteCoords --
- *
- * Delete one or more coordinates from a line item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Characters between "first" and "last", inclusive, get
- * deleted from itemPtr.
- *
- *--------------------------------------------------------------
- */
- static void
- LineDeleteCoords(canvas, itemPtr, first, last)
- Tk_Canvas canvas; /* Canvas containing itemPtr. */
- Tk_Item *itemPtr; /* Item in which to delete characters. */
- int first; /* Index of first character to delete. */
- int last; /* Index of last character to delete. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- int count, i, first1, last1;
- int length = 2*linePtr->numPoints;
- double *coordPtr;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- first &= -2;
- last &= -2;
- if (first < 0) {
- first = 0;
- }
- if (last >= length) {
- last = length-2;
- }
- if (first > last) {
- return;
- }
- if (linePtr->firstArrowPtr != NULL) {
- linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
- linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
- }
- if (linePtr->lastArrowPtr != NULL) {
- linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
- linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
- }
- first1 = first; last1 = last;
- if(first1>0) first1 -= 2;
- if(last1<length-2) last1 += 2;
- if (linePtr->smooth) {
- if(first1>0) first1 -= 2;
- if(last1<length-2) last1 += 2;
- }
- if((first1<2) && (last1 >= length-2)) {
- /*
- * This is some optimizing code that will result that only the part
- * of the line that changed (and the objects that are overlapping
- * with that part) need to be redrawn. A special flag is set that
- * instructs the general canvas code not to redraw the whole
- * object. If this flag is set, the redrawing has to be done here,
- * otherwise the general Canvas code will take care of it.
- */
- itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
- itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[first1];
- itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[first1+1];
- if ((linePtr->firstArrowPtr != NULL) && (first1<2)) {
- /* include old first arrow */
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- if ((linePtr->lastArrowPtr != NULL) && (last1>=length-2)) {
- /* include old last arrow */
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- coordPtr = linePtr->coordPtr+first1+2;
- for (i=first1+2; i<=last1; i+=2) {
- TkIncludePoint(itemPtr, coordPtr);
- coordPtr+=2;
- }
- }
- count = last + 2 - first;
- for (i=last+2; i<length; i++) {
- linePtr->coordPtr[i-count] = linePtr->coordPtr[i];
- }
- linePtr->numPoints -= count/2;
- if (linePtr->firstArrowPtr != NULL) {
- ckfree((char *) linePtr->firstArrowPtr);
- linePtr->firstArrowPtr = NULL;
- }
- if (linePtr->lastArrowPtr != NULL) {
- ckfree((char *) linePtr->lastArrowPtr);
- linePtr->lastArrowPtr = NULL;
- }
- if (linePtr->arrow != ARROWS_NONE) {
- ConfigureArrows(canvas, linePtr);
- }
- if(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
- double width;
- int intWidth;
- if ((linePtr->firstArrowPtr != NULL) && (first1<4)) {
- /* include new first arrow */
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- if ((linePtr->lastArrowPtr != NULL) && (last1>(length-4))) {
- /* include new right arrow */
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- TkIncludePoint(itemPtr, coordPtr);
- }
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- intWidth = (int) (width + 0.5);
- if (intWidth < 1) {
- intWidth = 1;
- }
- itemPtr->x1 -= intWidth; itemPtr->y1 -= intWidth;
- itemPtr->x2 += intWidth; itemPtr->y2 += intWidth;
- Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
- itemPtr->x2, itemPtr->y2);
- }
- ComputeLineBbox(canvas, linePtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * LineToPoint --
- *
- * Computes the distance from a given point to a given
- * line, in canvas units.
- *
- * Results:
- * The return value is 0 if the point whose x and y coordinates
- * are pointPtr[0] and pointPtr[1] is inside the line. If the
- * point isn't inside the line then the return value is the
- * distance from the point to the line.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static double
- LineToPoint(canvas, itemPtr, pointPtr)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item to check against point. */
- double *pointPtr; /* Pointer to x and y coordinates. */
- {
- Tk_State state = itemPtr->state;
- LineItem *linePtr = (LineItem *) itemPtr;
- double *coordPtr, *linePoints;
- double staticSpace[2*MAX_STATIC_POINTS];
- double poly[10];
- double bestDist, dist, width;
- int numPoints, count;
- int changedMiterToBevel; /* Non-zero means that a mitered corner
- * had to be treated as beveled after all
- * because the angle was < 11 degrees. */
- bestDist = 1.0e36;
- /*
- * Handle smoothed lines by generating an expanded set of points
- * against which to do the check.
- */
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
- numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- if (numPoints <= MAX_STATIC_POINTS) {
- linePoints = staticSpace;
- } else {
- linePoints = (double *) ckalloc((unsigned)
- (2*numPoints*sizeof(double)));
- }
- numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- linePoints);
- } else {
- numPoints = linePtr->numPoints;
- linePoints = linePtr->coordPtr;
- }
- if (width < 1.0) {
- width = 1.0;
- }
- if (!numPoints || itemPtr->state==TK_STATE_HIDDEN) {
- return bestDist;
- } else if (numPoints == 1) {
- bestDist = hypot(linePoints[0] - pointPtr[0], linePoints[1] - pointPtr[1])
- - width/2.0;
- if (bestDist < 0) bestDist = 0;
- return bestDist;
- }
- /*
- * The overall idea is to iterate through all of the edges of
- * the line, computing a polygon for each edge and testing the
- * point against that polygon. In addition, there are additional
- * tests to deal with rounded joints and caps.
- */
- changedMiterToBevel = 0;
- for (count = numPoints, coordPtr = linePoints; count >= 2;
- count--, coordPtr += 2) {
- /*
- * If rounding is done around the first point then compute
- * the distance between the point and the point.
- */
- if (((linePtr->capStyle == CapRound) && (count == numPoints))
- || ((linePtr->joinStyle == JoinRound)
- && (count != numPoints))) {
- dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- - width/2.0;
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- /*
- * Compute the polygonal shape corresponding to this edge,
- * consisting of two points for the first point of the edge
- * and two points for the last point of the edge.
- */
- if (count == numPoints) {
- TkGetButtPoints(coordPtr+2, coordPtr, width,
- linePtr->capStyle == CapProjecting, poly, poly+2);
- } else if ((linePtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
- poly[0] = poly[6];
- poly[1] = poly[7];
- poly[2] = poly[4];
- poly[3] = poly[5];
- } else {
- TkGetButtPoints(coordPtr+2, coordPtr, width, 0,
- poly, poly+2);
- /*
- * If this line uses beveled joints, then check the distance
- * to a polygon comprising the last two points of the previous
- * polygon and the first two from this polygon; this checks
- * the wedges that fill the mitered joint.
- */
- if ((linePtr->joinStyle == JoinBevel) || changedMiterToBevel) {
- poly[8] = poly[0];
- poly[9] = poly[1];
- dist = TkPolygonToPoint(poly, 5, pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- changedMiterToBevel = 0;
- }
- }
- if (count == 2) {
- TkGetButtPoints(coordPtr, coordPtr+2, width,
- linePtr->capStyle == CapProjecting, poly+4, poly+6);
- } else if (linePtr->joinStyle == JoinMiter) {
- if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
- width, poly+4, poly+6) == 0) {
- changedMiterToBevel = 1;
- TkGetButtPoints(coordPtr, coordPtr+2, width,
- 0, poly+4, poly+6);
- }
- } else {
- TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
- poly+4, poly+6);
- }
- poly[8] = poly[0];
- poly[9] = poly[1];
- dist = TkPolygonToPoint(poly, 5, pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- /*
- * If caps are rounded, check the distance to the cap around the
- * final end point of the line.
- */
- if (linePtr->capStyle == CapRound) {
- dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- - width/2.0;
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- /*
- * If there are arrowheads, check the distance to the arrowheads.
- */
- if (linePtr->arrow != ARROWS_NONE) {
- if (linePtr->arrow != ARROWS_LAST) {
- dist = TkPolygonToPoint(linePtr->firstArrowPtr, PTS_IN_ARROW,
- pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- if (linePtr->arrow != ARROWS_FIRST) {
- dist = TkPolygonToPoint(linePtr->lastArrowPtr, PTS_IN_ARROW,
- pointPtr);
- if (dist <= 0.0) {
- bestDist = 0.0;
- goto done;
- } else if (dist < bestDist) {
- bestDist = dist;
- }
- }
- }
- done:
- if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
- ckfree((char *) linePoints);
- }
- return bestDist;
- }
- /*
- *--------------------------------------------------------------
- *
- * LineToArea --
- *
- * This procedure is called to determine whether an item
- * lies entirely inside, entirely outside, or overlapping
- * a given rectangular area.
- *
- * Results:
- * -1 is returned if the item is entirely outside the
- * area, 0 if it overlaps, and 1 if it is entirely
- * inside the given area.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static int
- LineToArea(canvas, itemPtr, rectPtr)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item to check against line. */
- double *rectPtr;
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- double staticSpace[2*MAX_STATIC_POINTS];
- double *linePoints;
- int numPoints, result;
- double radius, width;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- radius = (width+1.0)/2.0;
- if ((state==TK_STATE_HIDDEN) || !linePtr->numPoints) {
- return -1;
- } else if (linePtr->numPoints == 1) {
- double oval[4];
- oval[0] = linePtr->coordPtr[0]-radius;
- oval[1] = linePtr->coordPtr[1]-radius;
- oval[2] = linePtr->coordPtr[0]+radius;
- oval[3] = linePtr->coordPtr[1]+radius;
- return TkOvalToArea(oval, rectPtr);
- }
- /*
- * Handle smoothed lines by generating an expanded set of points
- * against which to do the check.
- */
- if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
- numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- if (numPoints <= MAX_STATIC_POINTS) {
- linePoints = staticSpace;
- } else {
- linePoints = (double *) ckalloc((unsigned)
- (2*numPoints*sizeof(double)));
- }
- numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- linePoints);
- } else {
- numPoints = linePtr->numPoints;
- linePoints = linePtr->coordPtr;
- }
- /*
- * Check the segments of the line.
- */
- if (width < 1.0) {
- width = 1.0;
- }
- result = TkThickPolyLineToArea(linePoints, numPoints,
- width, linePtr->capStyle, linePtr->joinStyle,
- rectPtr);
- if (result == 0) {
- goto done;
- }
- /*
- * Check arrowheads, if any.
- */
- if (linePtr->arrow != ARROWS_NONE) {
- if (linePtr->arrow != ARROWS_LAST) {
- if (TkPolygonToArea(linePtr->firstArrowPtr, PTS_IN_ARROW,
- rectPtr) != result) {
- result = 0;
- goto done;
- }
- }
- if (linePtr->arrow != ARROWS_FIRST) {
- if (TkPolygonToArea(linePtr->lastArrowPtr, PTS_IN_ARROW,
- rectPtr) != result) {
- result = 0;
- goto done;
- }
- }
- }
- done:
- if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
- ckfree((char *) linePoints);
- }
- return result;
- }
- /*
- *--------------------------------------------------------------
- *
- * ScaleLine --
- *
- * This procedure is invoked to rescale a line item.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The line referred to by itemPtr is rescaled so that the
- * following transformation is applied to all point
- * coordinates:
- * x' = originX + scaleX*(x-originX)
- * y' = originY + scaleY*(y-originY)
- *
- *--------------------------------------------------------------
- */
- static void
- ScaleLine(canvas, itemPtr, originX, originY, scaleX, scaleY)
- Tk_Canvas canvas; /* Canvas containing line. */
- Tk_Item *itemPtr; /* Line to be scaled. */
- double originX, originY; /* Origin about which to scale rect. */
- double scaleX; /* Amount to scale in X direction. */
- double scaleY; /* Amount to scale in Y direction. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- double *coordPtr;
- int i;
- /*
- * Delete any arrowheads before scaling all the points (so that
- * the end-points of the line get restored).
- */
- if (linePtr->firstArrowPtr != NULL) {
- linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
- linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
- ckfree((char *) linePtr->firstArrowPtr);
- linePtr->firstArrowPtr = NULL;
- }
- if (linePtr->lastArrowPtr != NULL) {
- int i;
- i = 2*(linePtr->numPoints-1);
- linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
- linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
- ckfree((char *) linePtr->lastArrowPtr);
- linePtr->lastArrowPtr = NULL;
- }
- for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
- i++, coordPtr += 2) {
- coordPtr[0] = originX + scaleX*(*coordPtr - originX);
- coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
- }
- if (linePtr->arrow != ARROWS_NONE) {
- ConfigureArrows(canvas, linePtr);
- }
- ComputeLineBbox(canvas, linePtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * GetLineIndex --
- *
- * Parse an index into a line item and return either its value
- * or an error.
- *
- * Results:
- * A standard Tcl result. If all went well, then *indexPtr is
- * filled in with the index (into itemPtr) corresponding to
- * string. Otherwise an error message is left in
- * interp->result.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- GetLineIndex(interp, canvas, itemPtr, obj, indexPtr)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item for which the index is being
- * specified. */
- Tcl_Obj *obj; /* Specification of a particular coord
- * in itemPtr's line. */
- int *indexPtr; /* Where to store converted index. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- int length;
- char *string = Tcl_GetStringFromObj(obj, &length);
- if (string[0] == 'e') {
- if (strncmp(string, "end", (unsigned) length) == 0) {
- *indexPtr = 2*linePtr->numPoints;
- } else {
- badIndex:
- /*
- * Some of the paths here leave messages in interp->result,
- * so we have to clear it out before storing our own message.
- */
- Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
- Tcl_AppendResult(interp, "bad index "", string, """,
- (char *) NULL);
- return TCL_ERROR;
- }
- } else if (string[0] == '@') {
- int i;
- double x ,y, bestDist, dist, *coordPtr;
- char *end, *p;
- p = string+1;
- x = strtod(p, &end);
- if ((end == p) || (*end != ',')) {
- goto badIndex;
- }
- p = end+1;
- y = strtod(p, &end);
- if ((end == p) || (*end != 0)) {
- goto badIndex;
- }
- bestDist = 1.0e36;
- coordPtr = linePtr->coordPtr;
- *indexPtr = 0;
- for(i=0; i<linePtr->numPoints; i++) {
- dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
- if (dist<bestDist) {
- bestDist = dist;
- *indexPtr = 2*i;
- }
- coordPtr += 2;
- }
- } else {
- if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
- goto badIndex;
- }
- *indexPtr &= -2; /* if index is odd, make it even */
- if (*indexPtr < 0){
- *indexPtr = 0;
- } else if (*indexPtr > (2*linePtr->numPoints)) {
- *indexPtr = (2*linePtr->numPoints);
- }
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * TranslateLine --
- *
- * This procedure is called to move a line by a given amount.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The position of the line is offset by (xDelta, yDelta), and
- * the bounding box is updated in the generic part of the item
- * structure.
- *
- *--------------------------------------------------------------
- */
- static void
- TranslateLine(canvas, itemPtr, deltaX, deltaY)
- Tk_Canvas canvas; /* Canvas containing item. */
- Tk_Item *itemPtr; /* Item that is being moved. */
- double deltaX, deltaY; /* Amount by which item is to be
- * moved. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- double *coordPtr;
- int i;
- for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
- i++, coordPtr += 2) {
- coordPtr[0] += deltaX;
- coordPtr[1] += deltaY;
- }
- if (linePtr->firstArrowPtr != NULL) {
- for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- coordPtr[0] += deltaX;
- coordPtr[1] += deltaY;
- }
- }
- if (linePtr->lastArrowPtr != NULL) {
- for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
- i++, coordPtr += 2) {
- coordPtr[0] += deltaX;
- coordPtr[1] += deltaY;
- }
- }
- ComputeLineBbox(canvas, linePtr);
- }
- /*
- *--------------------------------------------------------------
- *
- * ParseArrowShape --
- *
- * This procedure is called back during option parsing to
- * parse arrow shape information.
- *
- * Results:
- * The return value is a standard Tcl result: TCL_OK means
- * that the arrow shape information was parsed ok, and
- * TCL_ERROR means it couldn't be parsed.
- *
- * Side effects:
- * Arrow information in recordPtr is updated.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static int
- ParseArrowShape(clientData, interp, tkwin, value, recordPtr, offset)
- ClientData clientData; /* Not used. */
- Tcl_Interp *interp; /* Used for error reporting. */
- Tk_Window tkwin; /* Not used. */
- CONST char *value; /* Textual specification of arrow shape. */
- char *recordPtr; /* Pointer to item record in which to
- * store arrow information. */
- int offset; /* Offset of shape information in widget
- * record. */
- {
- LineItem *linePtr = (LineItem *) recordPtr;
- double a, b, c;
- int argc;
- CONST char **argv = NULL;
- if (offset != Tk_Offset(LineItem, arrowShapeA)) {
- panic("ParseArrowShape received bogus offset");
- }
- if (Tcl_SplitList(interp, (char *) value, &argc, &argv) != TCL_OK) {
- syntaxError:
- Tcl_ResetResult(interp);
- Tcl_AppendResult(interp, "bad arrow shape "", value,
- "": must be list with three numbers", (char *) NULL);
- if (argv != NULL) {
- ckfree((char *) argv);
- }
- return TCL_ERROR;
- }
- if (argc != 3) {
- goto syntaxError;
- }
- if ((Tk_CanvasGetCoord(interp, linePtr->canvas, argv[0], &a) != TCL_OK)
- || (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[1], &b)
- != TCL_OK)
- || (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[2], &c)
- != TCL_OK)) {
- goto syntaxError;
- }
- linePtr->arrowShapeA = (float)a;
- linePtr->arrowShapeB = (float)b;
- linePtr->arrowShapeC = (float)c;
- ckfree((char *) argv);
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * PrintArrowShape --
- *
- * This procedure is a callback invoked by the configuration
- * code to return a printable value describing an arrow shape.
- *
- * Results:
- * None.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static char *
- PrintArrowShape(clientData, tkwin, recordPtr, offset, freeProcPtr)
- ClientData clientData; /* Not used. */
- Tk_Window tkwin; /* Window associated with linePtr's widget. */
- char *recordPtr; /* Pointer to item record containing current
- * shape information. */
- int offset; /* Offset of arrow information in record. */
- Tcl_FreeProc **freeProcPtr; /* Store address of procedure to call to
- * free string here. */
- {
- LineItem *linePtr = (LineItem *) recordPtr;
- char *buffer;
- buffer = (char *) ckalloc(120);
- sprintf(buffer, "%.5g %.5g %.5g", linePtr->arrowShapeA,
- linePtr->arrowShapeB, linePtr->arrowShapeC);
- *freeProcPtr = TCL_DYNAMIC;
- return buffer;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArrowParseProc --
- *
- * This procedure is invoked during option processing to handle
- * the "-arrow" option.
- *
- * Results:
- * A standard Tcl return value.
- *
- * Side effects:
- * The arrow for a given item gets replaced by the arrow
- * indicated in the value argument.
- *
- *--------------------------------------------------------------
- */
- static int
- ArrowParseProc(clientData, interp, tkwin, value, widgRec, offset)
- ClientData clientData; /* some flags.*/
- Tcl_Interp *interp; /* Used for reporting errors. */
- Tk_Window tkwin; /* Window containing canvas widget. */
- CONST char *value; /* Value of option. */
- char *widgRec; /* Pointer to record for item. */
- int offset; /* Offset into item. */
- {
- int c;
- size_t length;
- register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
- if(value == NULL || *value == 0) {
- *arrowPtr = ARROWS_NONE;
- return TCL_OK;
- }
- c = value[0];
- length = strlen(value);
- if ((c == 'n') && (strncmp(value, "none", length) == 0)) {
- *arrowPtr = ARROWS_NONE;
- return TCL_OK;
- }
- if ((c == 'f') && (strncmp(value, "first", length) == 0)) {
- *arrowPtr = ARROWS_FIRST;
- return TCL_OK;
- }
- if ((c == 'l') && (strncmp(value, "last", length) == 0)) {
- *arrowPtr = ARROWS_LAST;
- return TCL_OK;
- }
- if ((c == 'b') && (strncmp(value, "both", length) == 0)) {
- *arrowPtr = ARROWS_BOTH;
- return TCL_OK;
- }
- Tcl_AppendResult(interp, "bad arrow spec "", value,
- "": must be none, first, last, or both",
- (char *) NULL);
- *arrowPtr = ARROWS_NONE;
- return TCL_ERROR;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArrowPrintProc --
- *
- * This procedure is invoked by the Tk configuration code
- * to produce a printable string for the "-arrow"
- * configuration option.
- *
- * Results:
- * The return value is a string describing the arrows for
- * the item referred to by "widgRec". In addition, *freeProcPtr
- * is filled in with the address of a procedure to call to free
- * the result string when it's no longer needed (or NULL to
- * indicate that the string doesn't need to be freed).
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static char *
- ArrowPrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
- ClientData clientData; /* Ignored. */
- Tk_Window tkwin; /* Window containing canvas widget. */
- char *widgRec; /* Pointer to record for item. */
- int offset; /* Offset into item. */
- Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
- * information about how to reclaim
- * storage for return string. */
- {
- register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
- switch (*arrowPtr) {
- case ARROWS_FIRST:
- return "first";
- case ARROWS_LAST:
- return "last";
- case ARROWS_BOTH:
- return "both";
- default:
- return "none";
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * ConfigureArrows --
- *
- * If arrowheads have been requested for a line, this
- * procedure makes arrangements for the arrowheads.
- *
- * Results:
- * Always returns TCL_OK.
- *
- * Side effects:
- * Information in linePtr is set up for one or two arrowheads.
- * the firstArrowPtr and lastArrowPtr polygons are allocated
- * and initialized, if need be, and the end points of the line
- * are adjusted so that a thick line doesn't stick out past
- * the arrowheads.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static int
- ConfigureArrows(canvas, linePtr)
- Tk_Canvas canvas; /* Canvas in which arrows will be
- * displayed (interp and tkwin
- * fields are needed). */
- LineItem *linePtr; /* Item to configure for arrows. */
- {
- double *poly, *coordPtr;
- double dx, dy, length, sinTheta, cosTheta, temp;
- double fracHeight; /* Line width as fraction of
- * arrowhead width. */
- double backup; /* Distance to backup end points
- * so the line ends in the middle
- * of the arrowhead. */
- double vertX, vertY; /* Position of arrowhead vertex. */
- double shapeA, shapeB, shapeC; /* Adjusted coordinates (see
- * explanation below). */
- double width;
- Tk_State state = linePtr->header.state;
- if (linePtr->numPoints <2) {
- return TCL_OK;
- }
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = linePtr->outline.width;
- if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- }
- /*
- * The code below makes a tiny increase in the shape parameters
- * for the line. This is a bit of a hack, but it seems to result
- * in displays that more closely approximate the specified parameters.
- * Without the adjustment, the arrows come out smaller than expected.
- */
- shapeA = linePtr->arrowShapeA + 0.001;
- shapeB = linePtr->arrowShapeB + 0.001;
- shapeC = linePtr->arrowShapeC + width/2.0 + 0.001;
- /*
- * If there's an arrowhead on the first point of the line, compute
- * its polygon and adjust the first point of the line so that the
- * line doesn't stick out past the leading edge of the arrowhead.
- */
- fracHeight = (width/2.0)/shapeC;
- backup = fracHeight*shapeB + shapeA*(1.0 - fracHeight)/2.0;
- if (linePtr->arrow != ARROWS_LAST) {
- poly = linePtr->firstArrowPtr;
- if (poly == NULL) {
- poly = (double *) ckalloc((unsigned)
- (2*PTS_IN_ARROW*sizeof(double)));
- poly[0] = poly[10] = linePtr->coordPtr[0];
- poly[1] = poly[11] = linePtr->coordPtr[1];
- linePtr->firstArrowPtr = poly;
- }
- dx = poly[0] - linePtr->coordPtr[2];
- dy = poly[1] - linePtr->coordPtr[3];
- length = hypot(dx, dy);
- if (length == 0) {
- sinTheta = cosTheta = 0.0;
- } else {
- sinTheta = dy/length;
- cosTheta = dx/length;
- }
- vertX = poly[0] - shapeA*cosTheta;
- vertY = poly[1] - shapeA*sinTheta;
- temp = shapeC*sinTheta;
- poly[2] = poly[0] - shapeB*cosTheta + temp;
- poly[8] = poly[2] - 2*temp;
- temp = shapeC*cosTheta;
- poly[3] = poly[1] - shapeB*sinTheta - temp;
- poly[9] = poly[3] + 2*temp;
- poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
- poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
- poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
- poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
- /*
- * Polygon done. Now move the first point towards the second so
- * that the corners at the end of the line are inside the
- * arrowhead.
- */
- linePtr->coordPtr[0] = poly[0] - backup*cosTheta;
- linePtr->coordPtr[1] = poly[1] - backup*sinTheta;
- }
- /*
- * Similar arrowhead calculation for the last point of the line.
- */
- if (linePtr->arrow != ARROWS_FIRST) {
- coordPtr = linePtr->coordPtr + 2*(linePtr->numPoints-2);
- poly = linePtr->lastArrowPtr;
- if (poly == NULL) {
- poly = (double *) ckalloc((unsigned)
- (2*PTS_IN_ARROW*sizeof(double)));
- poly[0] = poly[10] = coordPtr[2];
- poly[1] = poly[11] = coordPtr[3];
- linePtr->lastArrowPtr = poly;
- }
- dx = poly[0] - coordPtr[0];
- dy = poly[1] - coordPtr[1];
- length = hypot(dx, dy);
- if (length == 0) {
- sinTheta = cosTheta = 0.0;
- } else {
- sinTheta = dy/length;
- cosTheta = dx/length;
- }
- vertX = poly[0] - shapeA*cosTheta;
- vertY = poly[1] - shapeA*sinTheta;
- temp = shapeC*sinTheta;
- poly[2] = poly[0] - shapeB*cosTheta + temp;
- poly[8] = poly[2] - 2*temp;
- temp = shapeC*cosTheta;
- poly[3] = poly[1] - shapeB*sinTheta - temp;
- poly[9] = poly[3] + 2*temp;
- poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
- poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
- poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
- poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
- coordPtr[2] = poly[0] - backup*cosTheta;
- coordPtr[3] = poly[1] - backup*sinTheta;
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * LineToPostscript --
- *
- * This procedure is called to generate Postscript for
- * line items.
- *
- * Results:
- * The return value is a standard Tcl result. If an error
- * occurs in generating Postscript then an error message is
- * left in the interp's result, replacing whatever used
- * to be there. If no error occurs, then Postscript for the
- * item is appended to the result.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- LineToPostscript(interp, canvas, itemPtr, prepass)
- Tcl_Interp *interp; /* Leave Postscript or error message
- * here. */
- Tk_Canvas canvas; /* Information about overall canvas. */
- Tk_Item *itemPtr; /* Item for which Postscript is
- * wanted. */
- int prepass; /* 1 means this is a prepass to
- * collect font information; 0 means
- * final Postscript is being created. */
- {
- LineItem *linePtr = (LineItem *) itemPtr;
- char buffer[64 + TCL_INTEGER_SPACE];
- char *style;
- double width;
- XColor *color;
- Pixmap stipple;
- Tk_State state = itemPtr->state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- width = linePtr->outline.width;
- color = linePtr->outline.color;
- stipple = linePtr->outline.stipple;
- if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
- if (linePtr->outline.activeWidth>width) {
- width = linePtr->outline.activeWidth;
- }
- if (linePtr->outline.activeColor!=NULL) {
- color = linePtr->outline.activeColor;
- }
- if (linePtr->outline.activeStipple!=None) {
- stipple = linePtr->outline.activeStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.disabledWidth>0) {
- width = linePtr->outline.disabledWidth;
- }
- if (linePtr->outline.disabledColor!=NULL) {
- color = linePtr->outline.disabledColor;
- }
- if (linePtr->outline.disabledStipple!=None) {
- stipple = linePtr->outline.disabledStipple;
- }
- }
- if (color == NULL || linePtr->numPoints<1 || linePtr->coordPtr==NULL) {
- return TCL_OK;
- }
- if (linePtr->numPoints==1) {
- sprintf(buffer, "%.15g %.15g translate %.15g %.15g",
- linePtr->coordPtr[0], Tk_CanvasPsY(canvas, linePtr->coordPtr[1]),
- width/2.0, width/2.0);
- Tcl_AppendResult(interp, "matrix currentmatrixn",buffer,
- " scale 1 0 moveto 0 0 1 0 360 arcnsetmatrixn", (char *) NULL);
- if (Tk_CanvasPsColor(interp, canvas, color)
- != TCL_OK) {
- return TCL_ERROR;
- }
- if (stipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- return TCL_OK;
- }
- /*
- * Generate a path for the line's center-line (do this differently
- * for straight lines and smoothed lines).
- */
- if ((!linePtr->smooth) || (linePtr->numPoints < 3)) {
- Tk_CanvasPsPath(interp, canvas, linePtr->coordPtr, linePtr->numPoints);
- } else {
- if ((stipple == None) && linePtr->smooth->postscriptProc) {
- linePtr->smooth->postscriptProc(interp, canvas,
- linePtr->coordPtr, linePtr->numPoints, linePtr->splineSteps);
- } else {
- /*
- * Special hack: Postscript printers don't appear to be able
- * to turn a path drawn with "curveto"s into a clipping path
- * without exceeding resource limits, so TkMakeBezierPostscript
- * won't work for stippled curves. Instead, generate all of
- * the intermediate points here and output them into the
- * Postscript file with "lineto"s instead.
- */
- double staticPoints[2*MAX_STATIC_POINTS];
- double *pointPtr;
- int numPoints;
- numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- (double *) NULL);
- pointPtr = staticPoints;
- if (numPoints > MAX_STATIC_POINTS) {
- pointPtr = (double *) ckalloc((unsigned)
- (numPoints * 2 * sizeof(double)));
- }
- numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
- linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
- pointPtr);
- Tk_CanvasPsPath(interp, canvas, pointPtr, numPoints);
- if (pointPtr != staticPoints) {
- ckfree((char *) pointPtr);
- }
- }
- }
- /*
- * Set other line-drawing parameters and stroke out the line.
- */
- style = "0 setlinecapn";
- if (linePtr->capStyle == CapRound) {
- style = "1 setlinecapn";
- } else if (linePtr->capStyle == CapProjecting) {
- style = "2 setlinecapn";
- }
- Tcl_AppendResult(interp, style, (char *) NULL);
- style = "0 setlinejoinn";
- if (linePtr->joinStyle == JoinRound) {
- style = "1 setlinejoinn";
- } else if (linePtr->joinStyle == JoinBevel) {
- style = "2 setlinejoinn";
- }
- Tcl_AppendResult(interp, style, (char *) NULL);
- if (Tk_CanvasPsOutline(canvas, itemPtr,
- &(linePtr->outline)) != TCL_OK) {
- return TCL_ERROR;
- }
- /*
- * Output polygons for the arrowheads, if there are any.
- */
- if (linePtr->firstArrowPtr != NULL) {
- if (stipple != None) {
- Tcl_AppendResult(interp, "grestore gsaven",
- (char *) NULL);
- }
- if (ArrowheadPostscript(interp, canvas, linePtr,
- linePtr->firstArrowPtr) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- if (linePtr->lastArrowPtr != NULL) {
- if (stipple != None) {
- Tcl_AppendResult(interp, "grestore gsaven", (char *) NULL);
- }
- if (ArrowheadPostscript(interp, canvas, linePtr,
- linePtr->lastArrowPtr) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * ArrowheadPostscript --
- *
- * This procedure is called to generate Postscript for
- * an arrowhead for a line item.
- *
- * Results:
- * The return value is a standard Tcl result. If an error
- * occurs in generating Postscript then an error message is
- * left in the interp's result, replacing whatever used
- * to be there. If no error occurs, then Postscript for the
- * arrowhead is appended to the result.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static int
- ArrowheadPostscript(interp, canvas, linePtr, arrowPtr)
- Tcl_Interp *interp; /* Leave Postscript or error message
- * here. */
- Tk_Canvas canvas; /* Information about overall canvas. */
- LineItem *linePtr; /* Line item for which Postscript is
- * being generated. */
- double *arrowPtr; /* Pointer to first of five points
- * describing arrowhead polygon. */
- {
- Pixmap stipple;
- Tk_State state = linePtr->header.state;
- if(state == TK_STATE_NULL) {
- state = ((TkCanvas *)canvas)->canvas_state;
- }
- stipple = linePtr->outline.stipple;
- if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
- if (linePtr->outline.activeStipple!=None) {
- stipple = linePtr->outline.activeStipple;
- }
- } else if (state==TK_STATE_DISABLED) {
- if (linePtr->outline.activeStipple!=None) {
- stipple = linePtr->outline.disabledStipple;
- }
- }
- Tk_CanvasPsPath(interp, canvas, arrowPtr, PTS_IN_ARROW);
- if (stipple != None) {
- Tcl_AppendResult(interp, "clip ", (char *) NULL);
- if (Tk_CanvasPsStipple(interp, canvas, stipple)
- != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- Tcl_AppendResult(interp, "filln", (char *) NULL);
- }
- return TCL_OK;
- }