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355 lines
10 KiB
JavaScript
355 lines
10 KiB
JavaScript
15 years ago
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dojo.provide("dojox.gfx.path");
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dojo.require("dojox.gfx.shape");
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dojo.declare("dojox.gfx.path.Path", dojox.gfx.Shape, {
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// summary: a generalized path shape
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constructor: function(rawNode){
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// summary: a path constructor
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// rawNode: Node: a DOM node to be used by this path object
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this.shape = dojo.clone(dojox.gfx.defaultPath);
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this.segments = [];
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this.absolute = true;
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this.last = {};
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this.rawNode = rawNode;
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},
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// mode manipulations
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setAbsoluteMode: function(mode){
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// summary: sets an absolute or relative mode for path points
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// mode: Boolean: true/false or "absolute"/"relative" to specify the mode
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this.absolute = typeof mode == "string" ? (mode == "absolute") : mode;
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return this; // self
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},
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getAbsoluteMode: function(){
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// summary: returns a current value of the absolute mode
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return this.absolute; // Boolean
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},
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getBoundingBox: function(){
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// summary: returns the bounding box {x, y, width, height} or null
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return (this.bbox && ("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; // dojox.gfx.Rectangle
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},
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getLastPosition: function(){
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// summary: returns the last point in the path, or null
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return "x" in this.last ? this.last : null; // Object
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},
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// segment interpretation
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_updateBBox: function(x, y){
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// summary: updates the bounding box of path with new point
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// x: Number: an x coordinate
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// y: Number: a y coordinate
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// we use {l, b, r, t} representation of a bbox
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if(this.bbox && ("l" in this.bbox)){
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if(this.bbox.l > x) this.bbox.l = x;
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if(this.bbox.r < x) this.bbox.r = x;
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if(this.bbox.t > y) this.bbox.t = y;
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if(this.bbox.b < y) this.bbox.b = y;
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}else{
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this.bbox = {l: x, b: y, r: x, t: y};
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}
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},
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_updateWithSegment: function(segment){
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// summary: updates the bounding box of path with new segment
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// segment: Object: a segment
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var n = segment.args, l = n.length;
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// update internal variables: bbox, absolute, last
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switch(segment.action){
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case "M":
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case "L":
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case "C":
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case "S":
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case "Q":
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case "T":
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for(var i = 0; i < l; i += 2){
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this._updateBBox(n[i], n[i + 1]);
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}
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this.last.x = n[l - 2];
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this.last.y = n[l - 1];
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this.absolute = true;
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break;
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case "H":
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for(var i = 0; i < l; ++i){
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this._updateBBox(n[i], this.last.y);
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}
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this.last.x = n[l - 1];
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this.absolute = true;
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break;
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case "V":
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for(var i = 0; i < l; ++i){
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this._updateBBox(this.last.x, n[i]);
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}
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this.last.y = n[l - 1];
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this.absolute = true;
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break;
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case "m":
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var start = 0;
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if(!("x" in this.last)){
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this._updateBBox(this.last.x = n[0], this.last.y = n[1]);
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start = 2;
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}
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for(var i = start; i < l; i += 2){
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this._updateBBox(this.last.x += n[i], this.last.y += n[i + 1]);
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}
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this.absolute = false;
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break;
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case "l":
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case "t":
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for(var i = 0; i < l; i += 2){
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this._updateBBox(this.last.x += n[i], this.last.y += n[i + 1]);
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}
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this.absolute = false;
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break;
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case "h":
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for(var i = 0; i < l; ++i){
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this._updateBBox(this.last.x += n[i], this.last.y);
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}
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this.absolute = false;
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break;
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case "v":
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for(var i = 0; i < l; ++i){
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this._updateBBox(this.last.x, this.last.y += n[i]);
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}
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this.absolute = false;
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break;
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case "c":
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for(var i = 0; i < l; i += 6){
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this._updateBBox(this.last.x + n[i], this.last.y + n[i + 1]);
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this._updateBBox(this.last.x + n[i + 2], this.last.y + n[i + 3]);
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this._updateBBox(this.last.x += n[i + 4], this.last.y += n[i + 5]);
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}
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this.absolute = false;
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break;
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case "s":
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case "q":
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for(var i = 0; i < l; i += 4){
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this._updateBBox(this.last.x + n[i], this.last.y + n[i + 1]);
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this._updateBBox(this.last.x += n[i + 2], this.last.y += n[i + 3]);
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}
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this.absolute = false;
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break;
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case "A":
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for(var i = 0; i < l; i += 7){
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this._updateBBox(n[i + 5], n[i + 6]);
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}
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this.last.x = n[l - 2];
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this.last.y = n[l - 1];
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this.absolute = true;
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break;
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case "a":
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for(var i = 0; i < l; i += 7){
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this._updateBBox(this.last.x += n[i + 5], this.last.y += n[i + 6]);
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}
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this.absolute = false;
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break;
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}
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// add an SVG path segment
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var path = [segment.action];
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for(var i = 0; i < l; ++i){
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path.push(dojox.gfx.formatNumber(n[i], true));
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}
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if(typeof this.shape.path == "string"){
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this.shape.path += path.join("");
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}else{
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Array.prototype.push.apply(this.shape.path, path);
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}
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},
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// a dictionary, which maps segment type codes to a number of their argemnts
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_validSegments: {m: 2, l: 2, h: 1, v: 1, c: 6, s: 4, q: 4, t: 2, a: 7, z: 0},
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_pushSegment: function(action, args){
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// summary: adds a segment
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// action: String: valid SVG code for a segment's type
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// args: Array: a list of parameters for this segment
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var group = this._validSegments[action.toLowerCase()];
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if(typeof group == "number"){
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if(group){
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if(args.length >= group){
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var segment = {action: action, args: args.slice(0, args.length - args.length % group)};
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this.segments.push(segment);
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this._updateWithSegment(segment);
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}
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}else{
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var segment = {action: action, args: []};
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this.segments.push(segment);
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this._updateWithSegment(segment);
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}
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}
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},
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_collectArgs: function(array, args){
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// summary: converts an array of arguments to plain numeric values
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// array: Array: an output argument (array of numbers)
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// args: Array: an input argument (can be values of Boolean, Number, dojox.gfx.Point, or an embedded array of them)
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for(var i = 0; i < args.length; ++i){
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var t = args[i];
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if(typeof t == "boolean"){
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array.push(t ? 1 : 0);
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}else if(typeof t == "number"){
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array.push(t);
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}else if(t instanceof Array){
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this._collectArgs(array, t);
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}else if("x" in t && "y" in t){
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array.push(t.x, t.y);
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}
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}
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},
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// segments
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moveTo: function(){
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// summary: formes a move segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "M" : "m", args);
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return this; // self
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},
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lineTo: function(){
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// summary: formes a line segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "L" : "l", args);
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return this; // self
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},
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hLineTo: function(){
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// summary: formes a horizontal line segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "H" : "h", args);
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return this; // self
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},
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vLineTo: function(){
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// summary: formes a vertical line segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "V" : "v", args);
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return this; // self
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},
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curveTo: function(){
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// summary: formes a curve segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "C" : "c", args);
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return this; // self
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},
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smoothCurveTo: function(){
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// summary: formes a smooth curve segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "S" : "s", args);
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return this; // self
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},
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qCurveTo: function(){
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// summary: formes a quadratic curve segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "Q" : "q", args);
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return this; // self
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},
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qSmoothCurveTo: function(){
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// summary: formes a quadratic smooth curve segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "T" : "t", args);
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return this; // self
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},
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arcTo: function(){
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// summary: formes an elliptic arc segment
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var args = [];
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this._collectArgs(args, arguments);
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this._pushSegment(this.absolute ? "A" : "a", args);
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return this; // self
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},
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closePath: function(){
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// summary: closes a path
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this._pushSegment("Z", []);
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return this; // self
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},
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// setShape
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_setPath: function(path){
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// summary: forms a path using an SVG path string
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// path: String: an SVG path string
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var p = dojo.isArray(path) ? path : path.match(dojox.gfx.pathSvgRegExp);
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this.segments = [];
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this.absolute = true;
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this.bbox = {};
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this.last = {};
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if(!p) return;
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// create segments
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var action = "", // current action
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args = [], // current arguments
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l = p.length;
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for(var i = 0; i < l; ++i){
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var t = p[i], x = parseFloat(t);
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if(isNaN(x)){
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if(action){
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this._pushSegment(action, args);
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}
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args = [];
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action = t;
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}else{
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args.push(x);
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}
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}
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this._pushSegment(action, args);
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},
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setShape: function(newShape){
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// summary: forms a path using a shape
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// newShape: Object: an SVG path string or a path object (see dojox.gfx.defaultPath)
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dojox.gfx.Shape.prototype.setShape.call(this, typeof newShape == "string" ? {path: newShape} : newShape);
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var path = this.shape.path;
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// switch to non-updating version of path building
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this.shape.path = [];
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this._setPath(path);
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// switch back to the string path
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this.shape.path = this.shape.path.join("");
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return this; // self
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},
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// useful constant for descendants
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_2PI: Math.PI * 2
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});
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dojo.declare("dojox.gfx.path.TextPath", dojox.gfx.path.Path, {
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// summary: a generalized TextPath shape
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constructor: function(rawNode){
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// summary: a TextPath shape constructor
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// rawNode: Node: a DOM node to be used by this TextPath object
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if(!("text" in this)){
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this.text = dojo.clone(dojox.gfx.defaultTextPath);
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}
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if(!("fontStyle" in this)){
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this.fontStyle = dojo.clone(dojox.gfx.defaultFont);
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}
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},
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getText: function(){
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// summary: returns the current text object or null
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return this.text; // Object
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},
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setText: function(newText){
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// summary: sets a text to be drawn along the path
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this.text = dojox.gfx.makeParameters(this.text,
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typeof newText == "string" ? {text: newText} : newText);
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this._setText();
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return this; // self
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},
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getFont: function(){
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// summary: returns the current font object or null
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return this.fontStyle; // Object
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},
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setFont: function(newFont){
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// summary: sets a font for text
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this.fontStyle = typeof newFont == "string" ?
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dojox.gfx.splitFontString(newFont) :
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dojox.gfx.makeParameters(dojox.gfx.defaultFont, newFont);
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this._setFont();
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return this; // self
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}
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});
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