path.js
上传用户:kimgenplus
上传日期:2016-06-05
资源大小:20877k
文件大小:7k
- /*
- Copyright (c) 2004-2006, The Dojo Foundation
- All Rights Reserved.
- Licensed under the Academic Free License version 2.1 or above OR the
- modified BSD license. For more information on Dojo licensing, see:
- http://dojotoolkit.org/community/licensing.shtml
- */
- dojo.provide("dojo.gfx.path");
- dojo.require("dojo.math");
- dojo.require("dojo.gfx.shape");
- dojo.declare("dojo.gfx.path.Path", dojo.gfx.Shape, {initializer:function (rawNode) {
- this.shape = dojo.lang.shallowCopy(dojo.gfx.defaultPath, true);
- this.segments = [];
- this.absolute = true;
- this.last = {};
- this.attach(rawNode);
- }, setAbsoluteMode:function (mode) {
- this.absolute = typeof (mode) == "string" ? (mode == "absolute") : mode;
- return this;
- }, getAbsoluteMode:function () {
- return this.absolute;
- }, getBoundingBox:function () {
- return "l" in this.bbox ? {x:this.bbox.l, y:this.bbox.t, width:this.bbox.r - this.bbox.l, height:this.bbox.b - this.bbox.t} : null;
- }, getLastPosition:function () {
- return "x" in this.last ? this.last : null;
- }, _updateBBox:function (x, y) {
- if ("l" in this.bbox) {
- if (this.bbox.l > x) {
- this.bbox.l = x;
- }
- if (this.bbox.r < x) {
- this.bbox.r = x;
- }
- if (this.bbox.t > y) {
- this.bbox.t = y;
- }
- if (this.bbox.b < y) {
- this.bbox.b = y;
- }
- } else {
- this.bbox = {l:x, b:y, r:x, t:y};
- }
- }, _updateWithSegment:function (segment) {
- var n = segment.args;
- var l = n.length;
- switch (segment.action) {
- case "M":
- case "L":
- case "C":
- case "S":
- case "Q":
- case "T":
- for (var i = 0; i < l; i += 2) {
- this._updateBBox(this.bbox, n[i], n[i + 1]);
- }
- this.last.x = n[l - 2];
- this.last.y = n[l - 1];
- this.absolute = true;
- break;
- case "H":
- for (var i = 0; i < l; ++i) {
- this._updateBBox(this.bbox, n[i], this.last.y);
- }
- this.last.x = n[l - 1];
- this.absolute = true;
- break;
- case "V":
- for (var i = 0; i < l; ++i) {
- this._updateBBox(this.bbox, this.last.x, n[i]);
- }
- this.last.y = n[l - 1];
- this.absolute = true;
- break;
- case "m":
- var start = 0;
- if (!("x" in this.last)) {
- this._updateBBox(this.bbox, this.last.x = n[0], this.last.y = n[1]);
- start = 2;
- }
- for (var i = start; i < l; i += 2) {
- this._updateBBox(this.bbox, this.last.x += n[i], this.last.y += n[i + 1]);
- }
- this.absolute = false;
- break;
- case "l":
- case "t":
- for (var i = 0; i < l; i += 2) {
- this._updateBBox(this.bbox, this.last.x += n[i], this.last.y += n[i + 1]);
- }
- this.absolute = false;
- break;
- case "h":
- for (var i = 0; i < l; ++i) {
- this._updateBBox(this.bbox, this.last.x += n[i], this.last.y);
- }
- this.absolute = false;
- break;
- case "v":
- for (var i = 0; i < l; ++i) {
- this._updateBBox(this.bbox, this.last.x, this.last.y += n[i]);
- }
- this.absolute = false;
- break;
- case "c":
- for (var i = 0; i < l; i += 6) {
- this._updateBBox(this.bbox, this.last.x + n[i], this.last.y + n[i + 1]);
- this._updateBBox(this.bbox, this.last.x + n[i + 2], this.last.y + n[i + 3]);
- this._updateBBox(this.bbox, this.last.x += n[i + 4], this.last.y += n[i + 5]);
- }
- this.absolute = false;
- break;
- case "s":
- case "q":
- for (var i = 0; i < l; i += 4) {
- this._updateBBox(this.bbox, this.last.x + n[i], this.last.y + n[i + 1]);
- this._updateBBox(this.bbox, this.last.x += n[i + 2], this.last.y += n[i + 3]);
- }
- this.absolute = false;
- break;
- case "A":
- for (var i = 0; i < l; i += 7) {
- this._updateBBox(this.bbox, n[i + 5], n[i + 6]);
- }
- this.last.x = n[l - 2];
- this.last.y = n[l - 1];
- this.absolute = true;
- break;
- case "a":
- for (var i = 0; i < l; i += 7) {
- this._updateBBox(this.bbox, this.last.x += n[i + 5], this.last.y += n[i + 6]);
- }
- this.absolute = false;
- break;
- }
- var path = [segment.action];
- for (var i = 0; i < l; ++i) {
- path.push(dojo.gfx.formatNumber(n[i], true));
- }
- if (typeof (this.shape.path) == "string") {
- this.shape.path += path.join("");
- } else {
- this.shape.path = this.shape.path.concat(path);
- }
- }, _validSegments:{m:2, l:2, h:1, v:1, c:6, s:4, q:4, t:2, a:7, z:0}, _pushSegment:function (action, args) {
- var group = this._validSegments[action.toLowerCase()];
- if (typeof (group) == "number") {
- if (group) {
- if (args.length >= group) {
- var segment = {action:action, args:args.slice(0, args.length - args.length % group)};
- this.segments.push(segment);
- this._updateWithSegment(segment);
- }
- } else {
- var segment = {action:action, args:[]};
- this.segments.push(segment);
- this._updateWithSegment(segment);
- }
- }
- }, _collectArgs:function (array, args) {
- for (var i = 0; i < args.length; ++i) {
- var t = args[i];
- if (typeof (t) == "boolean") {
- array.push(t ? 1 : 0);
- } else {
- if (typeof (t) == "number") {
- array.push(t);
- } else {
- if (t instanceof Array) {
- this._collectArgs(array, t);
- } else {
- if ("x" in t && "y" in t) {
- array.push(t.x);
- array.push(t.y);
- }
- }
- }
- }
- }
- }, moveTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "M" : "m", args);
- return this;
- }, lineTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "L" : "l", args);
- return this;
- }, hLineTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "H" : "h", args);
- return this;
- }, vLineTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "V" : "v", args);
- return this;
- }, curveTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "C" : "c", args);
- return this;
- }, smoothCurveTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "S" : "s", args);
- return this;
- }, qCurveTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "Q" : "q", args);
- return this;
- }, qSmoothCurveTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- this._pushSegment(this.absolute ? "T" : "t", args);
- return this;
- }, arcTo:function () {
- var args = [];
- this._collectArgs(args, arguments);
- for (var i = 2; i < args.length; i += 7) {
- args[i] = -args[i];
- }
- this._pushSegment(this.absolute ? "A" : "a", args);
- return this;
- }, closePath:function () {
- this._pushSegment("Z", []);
- return this;
- }, _setPath:function (path) {
- var p = path.match(dojo.gfx.pathRegExp);
- this.segments = [];
- this.absolute = true;
- this.bbox = {};
- this.last = {};
- if (!p) {
- return;
- }
- var action = "";
- var args = [];
- for (var i = 0; i < p.length; ++i) {
- var t = p[i];
- var x = parseFloat(t);
- if (isNaN(x)) {
- if (action) {
- this._pushSegment(action, args);
- }
- args = [];
- action = t;
- } else {
- args.push(x);
- }
- }
- this._pushSegment(action, args);
- }, setShape:function (newShape) {
- this.shape = dojo.gfx.makeParameters(this.shape, typeof (newShape) == "string" ? {path:newShape} : newShape);
- var path = this.shape.path;
- this.shape.path = [];
- this._setPath(path);
- this.shape.path = this.shape.path.join("");
- return this;
- }, _2PI:Math.PI * 2});