source: Dev/trunk/src/client/dojox/sketch/LeadAnnotation.js

define(["dojo/_base/kernel", "dojo/_base/lang", "./Annotation", "./Anchor"], function(dojo){
        dojo.getObject("sketch", true, dojox);

        var ta=dojox.sketch;
        ta.LeadAnnotation=function(figure, id){
                ta.Annotation.call(this, figure, id);
                this.transform={dx:0, dy:0 };
                this.start={ x:0, y:0 };
                this.control={x:100, y:-50};
                this.end={ x:200, y:0 };
                this.textPosition={ x:0, y:0 };
                this.textOffset=4;
                //this.textAlign="middle";
                this.textYOffset=10;

//              this.property('label',this.id);
                this.pathShape=null;
                this.labelShape=null;

                this.anchors.start=new ta.Anchor(this, "start");
                this.anchors.control=new ta.Anchor(this, "control");
                this.anchors.end=new ta.Anchor(this, "end");
        };
        ta.LeadAnnotation.prototype=new ta.Annotation;
        var p=ta.LeadAnnotation.prototype;
        p.constructor=ta.LeadAnnotation;

        p.type=function(){ return 'Lead'; }
        p.getType=function(){ return ta.LeadAnnotation; };

        p._pos=function(){
                var offset=this.textOffset, x=0, y=0;
                var slope=this.calculate.slope(this.control, this.end);
                this.textAlign="middle";
                if(Math.abs(slope)>=1){
                        x=this.end.x+this.calculate.dx(this.control, this.end, offset);
                        if(this.control.y>this.end.y){
                                y=this.end.y-offset;
                        } else {
                                y=this.end.y+offset+this.textYOffset;
                        }
                } else if(slope==0){
                        x=this.end.x+offset;
                        y=this.end.y+this.textYOffset;
                } else {
                        if(this.start.x>this.end.x){
                                x=this.end.x-offset;
                                this.textAlign="end";
                        } else {
                                x=this.end.x+offset;
                                this.textAlign="start";
                        }
                        if(this.start.y<this.end.y){
                                y=this.end.y+this.calculate.dy(this.control, this.end, offset)+this.textYOffset;
                        } else {
                                y=this.end.y+this.calculate.dy(this.control, this.end, -offset);
                        }
                }
                this.textPosition={ x:x, y:y };
        };
        p.apply=function(obj){
                if(!obj){ return; }
                if(obj.documentElement){ obj=obj.documentElement; }
                this.readCommonAttrs(obj);
                
                for(var i=0; i<obj.childNodes.length; i++){
                        var c=obj.childNodes[i];
                        if(c.localName=="text"){
                                this.property('label',c.childNodes.length?c.childNodes[0].nodeValue:'');
                        }
                        else if(c.localName=="path"){
                                //      the line
                                var d=c.getAttribute('d').split(" ");
                                var s=d[0].split(",");
                                this.start.x=parseFloat(s[0].substr(1),10);
                                this.start.y=parseFloat(s[1],10);
                                s=d[1].split(",");
                                this.control.x=parseFloat(s[0].substr(1),10);
                                this.control.y=parseFloat(s[1],10);
                                s=d[2].split(",");
                                this.end.x=parseFloat(s[0],10);
                                this.end.y=parseFloat(s[1],10);
                                var stroke=this.property('stroke');
                                var style=c.getAttribute('style');
                                var m=style.match(/stroke:([^;]+);/);
                                if(m){
                                        stroke.color=m[1];
                                        this.property('fill',m[1]);
                                }
                                m=style.match(/stroke-width:([^;]+);/);
                                if(m){
                                        stroke.width=m[1];
                                }
                                this.property('stroke',stroke);
                        }
                }
        };

        p.initialize=function(obj){
                this.apply(obj);
                this._pos();

                //      create either from scratch or based on the passed node
                this.shape=this.figure.group.createGroup();
                this.shape.getEventSource().setAttribute("id", this.id);
                this.pathShape=this.shape.createPath("M"+this.start.x+","+this.start.y+" Q"+this.control.x+","+this.control.y+" "+this.end.x+","+this.end.y+" l0,0");
                this.labelShape=this.shape.createText({
                                x:this.textPosition.x,
                                y:this.textPosition.y,
                                text:this.property('label'),
                                align:this.textAlign
                        });
                this.labelShape.getEventSource().setAttribute('id',this.id+"-labelShape");
                this.draw();
        };
        p.destroy=function(){
                if(!this.shape){ return; }
                this.shape.remove(this.pathShape);
                this.shape.remove(this.labelShape);
                this.figure.group.remove(this.shape);
                this.shape=this.pathShape=this.labelShape=null;
        };
        p.getBBox=function(){
                var x=Math.min(this.start.x, this.control.x, this.end.x);
                var y=Math.min(this.start.y, this.control.y, this.end.y);
                var w=Math.max(this.start.x, this.control.x, this.end.x)-x;
                var h=Math.max(this.start.y, this.control.y, this.end.y)-y;
                return { x:x, y:y, width:w, height:h };
        };
        p.draw=function(obj){
                this.apply(obj);
                this._pos();
                this.shape.setTransform(this.transform);
                this.pathShape.setShape("M"+this.start.x+","+this.start.y+" Q"+this.control.x+","+this.control.y+" "+this.end.x+","+this.end.y+" l0,0");
                this.labelShape.setShape({
                                x:this.textPosition.x,
                                y:this.textPosition.y,
                                text:this.property('label')
                        })
                        .setFill(this.property('fill'));
                this.zoom();
        };
        p.serialize=function(){
                var stroke=this.property('stroke');
                return '<g '+this.writeCommonAttrs()+'>'
                        + '<path style="stroke:'+stroke.color+';stroke-width:'+stroke.width+';fill:none;" d="'
                        + "M"+this.start.x+","+this.start.y+" "
                        + "Q"+this.control.x+","+this.control.y+" "
                        + this.end.x+","+this.end.y
                        + '" />'
                        + '<text style="fill:'+stroke.color+';text-anchor:'+this.textAlign+'" font-weight="bold" '
                        + 'x="' + this.textPosition.x + '" '
                        + 'y="' + this.textPosition.y + '">'
                        + this.property('label')
                        + '</text>'
                        + '</g>';
        };

        ta.Annotation.register("Lead");
        return dojox.sketch.LeadAnnotation;
});