shape.js

这是一个ajax的例子大家好好的看看就是一个鱼眼的效果

	// summary: a container of shapes, which can be used 
	//	as a foundation for renderer-specific groups, or as a way 
	//	to logically group shapes (e.g, to propagate matricies)
	
	_init: function() {
		// children: Array: a list of children
		this.children = [];
	},
	
	// group management
	
	add: function(shape){
		// summary: adds a shape to the list
		// shape: dojox.gfx.Shape: a shape
		var oldParent = shape.getParent();
		if(oldParent){
			oldParent.remove(shape, true);
		}
		this.children.push(shape);
		return shape._setParent(this, this._getRealMatrix());	// self
	},
	remove: function(shape, silently){
		// summary: removes a shape from the list
		// silently: Boolean?: if true, do not redraw a picture yet
		for(var i = 0; i < this.children.length; ++i){
			if(this.children[i] == shape){
				if(silently){
					// skip for now
				}else{
					shape._setParent(null, null);
				}
				this.children.splice(i, 1);
				break;
			}
		}
		return this;	// self
	},
	clear: function(){
		// summary: removes all shapes from a group/surface
		this.children = [];
		return this;	// self
	},
	
	// moving child nodes
	
	_moveChildToFront: function(shape){
		// summary: moves a shape to front of the list of shapes
		for(var i = 0; i < this.children.length; ++i){
			if(this.children[i] == shape){
				this.children.splice(i, 1);
				this.children.push(shape);
				break;
			}
		}
		return this;	// self
	},
	_moveChildToBack: function(shape){
		// summary: moves a shape to back of the list of shapes
		for(var i = 0; i < this.children.length; ++i){
			if(this.children[i] == shape){
				this.children.splice(i, 1);
				this.children.unshift(shape);
				break;
			}
		}
		return this;	// self
	}
};

dojo.declare("dojox.gfx.shape.Surface", null, {
	// summary: a surface object to be used for drawings
	constructor: function(){
		// underlying node
		this.rawNode = null;
	},
	getEventSource: function(){
		// summary: returns a node, which can be used to attach event listeners
		return this.rawNode; // Node
	},
	_getRealMatrix: function(){
		// summary: always returns the identity matrix
		return null;	// dojox.gfx.Matrix2D
	}
});

dojo.extend(dojox.gfx.shape.Surface, dojox.gfx.shape._eventsProcessing);

dojo.declare("dojox.gfx.Point", null, {
	// summary: a hypothetical 2D point to be used for drawings - {x, y}
	// description: This object is defined for documentation purposes.
	//	You should use the naked object instead: {x: 1, y: 2}.
});

dojo.declare("dojox.gfx.Rectangle", null, {
	// summary: a hypothetical rectangle - {x, y, width, height}
	// description: This object is defined for documentation purposes.
	//	You should use the naked object instead: {x: 1, y: 2, width: 100, height: 200}.
});

dojo.declare("dojox.gfx.shape.Rect", dojox.gfx.Shape, {
	// summary: a generic rectangle
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultRect);
		this.rawNode = rawNode;
	},
	getBoundingBox: function(){
		// summary: returns the bounding box (its shape in this case)
		return this.shape;	// dojox.gfx.Rectangle
	}
});

dojo.declare("dojox.gfx.shape.Ellipse", dojox.gfx.Shape, {
	// summary: a generic ellipse
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultEllipse);
		this.rawNode = rawNode;
	},
	getBoundingBox: function(){
		// summary: returns the bounding box
		if(!this.bbox){
			var shape = this.shape;
			this.bbox = {x: shape.cx - shape.rx, y: shape.cy - shape.ry, 
				width: 2 * shape.rx, height: 2 * shape.ry};
		}
		return this.bbox;	// dojox.gfx.Rectangle
	}
});

dojo.declare("dojox.gfx.shape.Circle", dojox.gfx.Shape, {
	// summary: a generic circle
	//	(this is a helper object, which is defined for convenience)
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultCircle);
		this.rawNode = rawNode;
	},
	getBoundingBox: function(){
		// summary: returns the bounding box
		if(!this.bbox){
			var shape = this.shape;
			this.bbox = {x: shape.cx - shape.r, y: shape.cy - shape.r, 
				width: 2 * shape.r, height: 2 * shape.r};
		}
		return this.bbox;	// dojox.gfx.Rectangle
	}
});

dojo.declare("dojox.gfx.shape.Line", dojox.gfx.Shape, {
	// summary: a generic line
	//	(this is a helper object, which is defined for convenience)
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultLine);
		this.rawNode = rawNode;
	},
	getBoundingBox: function(){
		// summary: returns the bounding box
		if(!this.bbox){
			var shape = this.shape;
			this.bbox = {
				x:		Math.min(shape.x1, shape.x2),
				y:		Math.min(shape.y1, shape.y2),
				width:	Math.abs(shape.x2 - shape.x1),
				height:	Math.abs(shape.y2 - shape.y1)
			};
		}
		return this.bbox;	// dojox.gfx.Rectangle
	}
});

dojo.declare("dojox.gfx.shape.Polyline", dojox.gfx.Shape, {
	// summary: a generic polyline/polygon
	//	(this is a helper object, which is defined for convenience)
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultPolyline);
		this.rawNode = rawNode;
	},
	setShape: function(points, closed){
		// summary: sets a polyline/polygon shape object
		// points: Object: a polyline/polygon shape object
		// closed: Boolean: close the polyline to make a polygon
		if(points && points instanceof Array){
			// points: Array: an array of points
			dojox.gfx.Shape.prototype.setShape.call(this, {points: points});
			if(closed && this.shape.points.length){ 
				this.shape.points.push(this.shape.points[0]);
			}
		}else{
			dojox.gfx.Shape.prototype.setShape.call(this, points);
		}
		return this;	// self
	},
	getBoundingBox: function(){
		// summary: returns the bounding box
		if(!this.bbox && this.shape.points.length){
			var p = this.shape.points;
			var l = p.length;
			var t = p[0];
			var bbox = {l: t.x, t: t.y, r: t.x, b: t.y};
			for(var i = 1; i < l; ++i){
				t = p[i];
				if(bbox.l > t.x) bbox.l = t.x;
				if(bbox.r < t.x) bbox.r = t.x;
				if(bbox.t > t.y) bbox.t = t.y;
				if(bbox.b < t.y) bbox.b = t.y;
			}
			this.bbox = {
				x:		bbox.l, 
				y:		bbox.t, 
				width:	bbox.r - bbox.l, 
				height:	bbox.b - bbox.t
			};
		}
		return this.bbox;	// dojox.gfx.Rectangle
	}
});

dojo.declare("dojox.gfx.shape.Image", dojox.gfx.Shape, {
	// summary: a generic image
	//	(this is a helper object, which is defined for convenience)
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.shape = dojo.clone(dojox.gfx.defaultImage);
		this.rawNode = rawNode;
	},
	getBoundingBox: function(){
		// summary: returns the bounding box (its shape in this case)
		return this.shape;	// dojox.gfx.Rectangle
	},
	setStroke: function(){
		// summary: ignore setting a stroke style
		return this;	// self
	},
	setFill: function(){
		// summary: ignore setting a fill style
		return this;	// self
	}
});

dojo.declare("dojox.gfx.shape.Text", dojox.gfx.Shape, {
	// summary: a generic text
	constructor: function(rawNode) {
		// rawNode: Node: a DOM Node
		this.fontStyle = null;
		this.shape = dojo.clone(dojox.gfx.defaultText);
		this.rawNode = rawNode;
	},
	getFont: function(){
		// summary: returns the current font object or null
		return this.fontStyle;	// Object
	},
	setFont: function(newFont){
		// summary: sets a font for text
		// newFont: Object: a font object (see dojox.gfx.defaultFont) or a font string
		this.fontStyle = typeof newFont == "string" ? dojox.gfx.splitFontString(newFont) :
			dojox.gfx.makeParameters(dojox.gfx.defaultFont, newFont);
		this._setFont();
		return this;	// self
	}
});

dojox.gfx.shape.Creator = {
	// summary: shape creators
	createShape: function(shape){
		// summary: creates a shape object based on its type; it is meant to be used
		//	by group-like objects
		// shape: Object: a shape descriptor object
		switch(shape.type){
			case dojox.gfx.defaultPath.type:		return this.createPath(shape);
			case dojox.gfx.defaultRect.type:		return this.createRect(shape);
			case dojox.gfx.defaultCircle.type:		return this.createCircle(shape);
			case dojox.gfx.defaultEllipse.type:		return this.createEllipse(shape);
			case dojox.gfx.defaultLine.type:		return this.createLine(shape);
			case dojox.gfx.defaultPolyline.type:	return this.createPolyline(shape);
			case dojox.gfx.defaultImage.type:		return this.createImage(shape);
			case dojox.gfx.defaultText.type:		return this.createText(shape);
			case dojox.gfx.defaultTextPath.type:	return this.createTextPath(shape);
		}
		return null;
	},
	createGroup: function(){
		// summary: creates an SVG group shape
		return this.createObject(dojox.gfx.Group);	// dojox.gfx.Group
	},
	createRect: function(rect){
		// summary: creates an SVG rectangle shape
		// rect: Object: a path object (see dojox.gfx.defaultRect)
		return this.createObject(dojox.gfx.Rect, rect);	// dojox.gfx.Rect
	},
	createEllipse: function(ellipse){
		// summary: creates an SVG ellipse shape
		// ellipse: Object: an ellipse object (see dojox.gfx.defaultEllipse)
		return this.createObject(dojox.gfx.Ellipse, ellipse);	// dojox.gfx.Ellipse
	},
	createCircle: function(circle){
		// summary: creates an SVG circle shape
		// circle: Object: a circle object (see dojox.gfx.defaultCircle)
		return this.createObject(dojox.gfx.Circle, circle);	// dojox.gfx.Circle
	},
	createLine: function(line){
		// summary: creates an SVG line shape
		// line: Object: a line object (see dojox.gfx.defaultLine)
		return this.createObject(dojox.gfx.Line, line);	// dojox.gfx.Line
	},
	createPolyline: function(points){
		// summary: creates an SVG polyline/polygon shape
		// points: Object: a points object (see dojox.gfx.defaultPolyline)
		//	or an Array of points
		return this.createObject(dojox.gfx.Polyline, points);	// dojox.gfx.Polyline
	},
	createImage: function(image){
		// summary: creates an SVG image shape
		// image: Object: an image object (see dojox.gfx.defaultImage)
		return this.createObject(dojox.gfx.Image, image);	// dojox.gfx.Image
	},
	createText: function(text){
		// summary: creates an SVG text shape
		// text: Object: a text object (see dojox.gfx.defaultText)
		return this.createObject(dojox.gfx.Text, text);	// dojox.gfx.Text
	},
	createPath: function(path){
		// summary: creates an SVG path shape
		// path: Object: a path object (see dojox.gfx.defaultPath)
		return this.createObject(dojox.gfx.Path, path);	// dojox.gfx.Path
	},
	createTextPath: function(text){
		// summary: creates an SVG text shape
		// text: Object: a textpath object (see dojox.gfx.defaultTextPath)
		return this.createObject(dojox.gfx.TextPath, {}).setText(text);	// dojox.gfx.TextPath
	},
	createObject: function(shapeType, rawShape){
		// summary: creates an instance of the passed shapeType class
		// shapeType: Function: a class constructor to create an instance of
		// rawShape: Object: properties to be passed in to the classes "setShape" method

		// SHOULD BE RE-IMPLEMENTED BY THE RENDERER!

		return null;	// dojox.gfx.Shape
	}
};

}