source: Dev/trunk/src/client/dojox/gfx/svgext.js

define([
        "dojo/dom",
        "dojo/_base/array",
        "dojo/_base/window",
        "./_base",
        "./svg"], 
        function(dom, array, win, gfx, svg){

        /*=====
        return {
                // summary:
                //              A module that adds svg-specific features to the gfx api. You should require this module
                //              when your application specifically targets the SVG renderer.
        }
        =====*/

        var svgext = gfx.svgext = {};
        var toIgnore = {
                primitives:null,
                tag:null,
                children:null
        };

        function buildFilterPrimitivesDOM(primitive, parentNode){
                var node =  parentNode.ownerDocument.createElementNS(svg.xmlns.svg, primitive.tag);
                parentNode.appendChild(node);
                for(var p in primitive){
                        if(!(p in toIgnore)){
                                node.setAttribute(p, primitive[p]);
                        }
                }
                if(primitive.children){
                        array.forEach(primitive.children, function(f){buildFilterPrimitivesDOM(f, node);});
                }
                return node;
        }

        /*=====
        declare("dojox.gfx.svgext.__FilterPrimitiveArgs", null, {
                // summary:
                //              Represents an SVG filter primitive.
                // description:
                //              In addition to the following properties, a FilterPrimitiveArgs should define the properties specific to
                //              this primitive, as defined by the SVG spec.
                // example:
                //              Define a simple feGaussianBlur primitive:
                //      |       var blurPrimitive = {
                //      |               "tag": "feGaussianBlur",
                //      |               "in": "SourceAlpha",
                //      |               "stdDeviation":"4",
                //      |               "result":"blur"
                //      |       };
                //
                // example:
                //              Define a feSpecularLighting primitive with one fePointLight child
                //      |       var lighting = {
                //      |               "tag": "feSpecularLighting",
                //      |               "in":"blur",
                //      |               "surfaceScale":5,
                //      |               "specularConstant":.75,
                //      |               "specularExponent":20,
                //      |               "lighting-color":"#bbbbbb",
                //      |               "result":"specOut"
                //      |               "children": [
                //      |                       "tag": "fePointLight"
                //      |                       "x":-5000,
                //      |                       "y":-10000,
                //      |                       "z":20000
                //      |               ]
                //      |       };

                // tag: String?
                //              The type of the primitive, as specified by the SVG spec (http://www.w3.org/TR/SVG/filters.html)
                tag: null,

                // children: dojox.gfx.svgext.__FilterPrimitiveArgs[]?
                //              An array of child primitives, if any.
                children: null
        });
        =====*/


        /*=====
        declare("dojox.gfx.svgext.__FilterArgs", null, {
                // summary:
                //              The filter arguments passed to the dojox/gfx/svgext/Shape.setFilter method.
                // description:
                //              An object defining the properties of a SVG Filter.
                // example:
                //              Define a drop shadow filter:
                //      |       var filter = {
                //      |               "id": "fastSmallDropShadow",
                //      |               "x": "-10%",
                //      |               "y": "-10%",
                //      |               "width": "125%",
                //      |               "height": "125%",
                //      |               "primitives": [{
                //      |                       "tag": "feColorMatrix",
                //      |                       "in": "SourceAlpha",
                //      |                       "type": "matrix",
                //      |                       "result": "grey",
                //      |                       "values": "0.2125,0.7154,0.0721,0,0,0.2125,0.7154,0.0721,0,0,0.2125,0.7154,0.0721,0,0,0,0,0,0.7,0"
                //      |               },{
                //      |                       "tag": "feOffset",
                //      |                       "dx": 3,
                //      |                       "dy": 3,
                //      |                       "result": "offsetBlur"
                //      |               },{
                //      |                       "tag": "feMerge",
                //      |                       "children":[{
                //      |                               "tag": "feMergeNode",
                //      |                               "in": "offsetBlur"
                //      |                       },{
                //      |                               "tag": "feMergeNode",
                //      |                               "in": "SourceGraphic"
                //      |                       }]
                //      |               }]
                //      |       };


                // id: String?
                //              The filter identifier. If none is provided, a generated id will be used.
                id: null,

                // filterUnits: String?
                //              The coordinate system of the filter. Default is "userSpaceOnUse".
                filterUnits: "userSpaceOnUse",

                // primitives: dojox.gfx.svgext.__FilterPrimitiveArgs[]
                //              An array of filter primitives that define this filter.
                primitives: []
        });
        =====*/

        svg.Shape.extend({
                addRenderingOption: function(/*String*/option, /*String*/value){
                        // summary:
                        //              Adds the specified SVG rendering option on this shape.
                        // option: String
                        //              The name of the rendering option to add to this shape, as specified by the
                        //              SVG specification (http://www.w3.org/TR/SVG/painting.html#RenderingProperties)
                        // value: String
                        //              the option value.
                        this.rawNode.setAttribute(option, value);
                        return this; // self
                },

                setFilter: function(/*dojox.gfx.svgext.__FilterArgs*/filter){
                        // summary:
                        //              Sets the specified SVG Filter on this shape.
                        // filter: dojox.gfx.svgext.__FilterArgs
                        //              An object that defines the filter properties. Note that in order to make the creation of such filter
                        //              easier, the dojox/gfx/filters module defines both a simple API to easily create filter objects and
                        //              also a set of predefined filters like drop shadows, blurs, textures effects (among others).
                        // example:
                        //              Sets a drop shadow filter:
                        //      |       var filter = {
                        //      |               "id": "fastSmallDropShadow",
                        //      |               "x": "-10%",
                        //      |               "y": "-10%",
                        //      |               "width": "125%",
                        //      |               "height": "125%",
                        //      |               "primitives": [{
                        //      |                       "tag": "feColorMatrix",
                        //      |                       "in": "SourceAlpha",
                        //      |                       "type": "matrix",
                        //      |                       "result": "grey",
                        //      |                       "values": "0.2125,0.7154,0.0721,0,0,0.2125,0.7154,0.0721,0,0,0.2125,0.7154,0.0721,0,0,0,0,0,0.7,0"
                        //      |               },{
                        //      |                       "tag": "feOffset",
                        //      |                       "dx": 3,
                        //      |                       "dy": 3,
                        //      |                       "result": "offsetBlur"
                        //      |               },{
                        //      |                       "tag": "feMerge",
                        //      |                       "in": "offsetBlur",
                        //      |                       "in2": "SourceGraphic"
                        //      |               }]
                        //      |       };
                        //      |       var shape = surface.createRect().setFilter(filter);
                        //
                        // example:
                        //              Sets a predefined filter from the dojox/gfx/filters module:
                        //      |       require(["dojox/gfx/filters","dojox/gfx/svgext",...], function(filters, svgext){
                        //      |               ...
                        //      |               var filter = filters.textures.paper({"id":"myFilter","x":0,"y":0,"width":100,"height":100});
                        //      |               var shape = surface.createRect().setFilter(filter);

                        if(!filter){
                                this.rawNode.removeAttribute("filter");
                                this.filter = null;
                                return this;
                        }
                        this.filter = filter;
                        filter.id = filter.id || gfx._base._getUniqueId();
                        var filterNode = dom.byId(filter.id);
                        if(!filterNode){
                                filterNode = this.rawNode.ownerDocument.createElementNS(svg.xmlns.svg, "filter");
                                filterNode.setAttribute("filterUnits", "userSpaceOnUse");
                                for(var p in filter){
                                        if(!(p in toIgnore)){
                                                filterNode.setAttribute(p, filter[p]);
                                        }
                                }
                                array.forEach(filter.primitives, function(p){
                                        buildFilterPrimitivesDOM(p, filterNode);
                                });
                                var surface = this._getParentSurface();
                                if(surface){
                                        var defs = surface.defNode;
                                        defs.appendChild(filterNode);
                                }
                        }
                        this.rawNode.setAttribute("filter", "url(#"+filter.id+")");
                        return this;
                },

                getFilter: function(){
                        // summary:
                        //              Gets the shape SVG Filter.
                        return this.filter;
                }
        });
        return svgext;
});