GUIPolyE.c
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上传日期:2017-08-10
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- /*
- *********************************************************************************************************
- * uC/GUI
- * Universal graphic software for embedded applications
- *
- * (c) Copyright 2002, Micrium Inc., Weston, FL
- * (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
- *
- * 礐/GUI is protected by international copyright laws. Knowledge of the
- * source code may not be used to write a similar product. This file may
- * only be used in accordance with a license and should not be redistributed
- * in any way. We appreciate your understanding and fairness.
- *
- ----------------------------------------------------------------------
- File : GUIPolyE.c
- Purpose : Polygon enlarge
- ----------------------------------------------------------------------
- */
- #include <math.h>
- #include "GUI.H"
- #include "GUIDebug.H"
- typedef struct {
- float x,y;
- } tfPoint;
- static int fround ( float f) {
- if (f>0)
- return f+0.5;
- return f-0.5;
- }
- static void Normalize(tfPoint* pfPoint) {
- float fx = pfPoint->x;
- float fy = pfPoint->y;
- float r = sqrt(fx*fx + fy*fy);
- if (r > 0) {
- pfPoint->x = fx/r;
- pfPoint->y = fy/r;
- }
- }
- static void ReverseLen(tfPoint* pfPoint) {
- float fx = pfPoint->x;
- float fy = pfPoint->y;
- float r = sqrt(fx*fx/2 + fy*fy/2);
- if (r > 0) {
- pfPoint->x = fx/r/r;
- pfPoint->y = fy/r/r;
- }
- }
- static void GetVect(tfPoint* pfPoint, const GUI_POINT* pSrc, int NumPoints, int Index) {
- int Off0 = (Index + NumPoints-1) % NumPoints;
- int Off1 = Index % NumPoints;
- pfPoint->x = pSrc[Off1].x - pSrc[Off0].x;
- pfPoint->y = pSrc[Off1].y - pSrc[Off0].y;
- }
- /*******************************************************************
- *
- * GUI_EnlargePolygon
- *
- ********************************************************************
- */
- #if 0
- void GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) {
- int j;
- /* Calc destination points */
- for (j=0; j<NumPoints; j++) {
- int x, y;
- tfPoint aVect[2];
- /* Get the vectors */
- GetVect(&aVect[0], pSrc, NumPoints, j);
- GetVect(&aVect[1], pSrc, NumPoints, j+1);
- /* Normalize the vectors and add vectors */
- Normalize(&aVect[0]);
- Normalize(&aVect[1]);
- aVect[0].x += aVect[1].x;
- aVect[0].y += aVect[1].y;
- /* Resulting vector needs to be normalized again */
- Normalize(&aVect[0]);
- x = fround(aVect[0].y * Len);
- y = -fround(aVect[0].x * Len);
- /* Store destination */
- (pDest+j)->x = (pSrc+j)->x + x;
- (pDest+j)->y = (pSrc+j)->y + y;
- }
- }
- #else
- void GUI_EnlargePolygon(GUI_POINT* pDest, const GUI_POINT* pSrc, int NumPoints, int Len) {
- int j;
- /* Calc destination points */
- for (j=0; j<NumPoints; j++) {
- int x, y;
- tfPoint aVect[2];
- /* Get the vectors */
- GetVect(&aVect[0], pSrc, NumPoints, j);
- GetVect(&aVect[1], pSrc, NumPoints, j+1);
- /* Normalize the vectors and add vectors */
- Normalize(&aVect[0]);
- Normalize(&aVect[1]);
- aVect[0].x += aVect[1].x;
- aVect[0].y += aVect[1].y;
- /* Resulting vector needs to be normalized again */
- ReverseLen(&aVect[0]);
- x = fround(aVect[0].y * Len);
- y = -fround(aVect[0].x * Len);
- /* Store destination */
- (pDest+j)->x = (pSrc+j)->x + x;
- (pDest+j)->y = (pSrc+j)->y + y;
- }
- }
- #endif