GFX module potentially

gfx.js

define(["dojo/_base/config", "./" + (function(){
	var renderer, sl, flag, match;
	while(!renderer){
		// Have a way to force a GFX renderer, if so desired.
		// Useful for being able to serialize GFX data in a particular format.
		if(dojo.config.forceGfxRenderer){
			renderer = dojo.config.forceGfxRenderer;
			break;
		}
		var renderers = (typeof dojo.config.gfxRenderer === "string" ?
			dojo.config.gfxRenderer : "svg,vml,canvas,silverlight").split(",");
		var i = 0;
		for(i = 0; i < renderers.length; ++i){
			switch(renderers[i]){
				case "svg":
					// the next test is from https://github.com/phiggins42/has.js
					if("SVGAngle" in dojo.global){
						renderer = "svg";
					}
					break;
				case "vml":
					if(dojo.isIE){
						renderer = "vml";
					}
					break;
				case "silverlight":
					try{
						if(dojo.isIE){
							sl = new ActiveXObject("AgControl.AgControl");
							if(sl && sl.IsVersionSupported("1.0")){
								flag = true;
							}
						}else{
							if(navigator.plugins["Silverlight Plug-In"]){
								flag = true;
							}
						}
					}catch(e){
						flag = false;
					}finally{
						sl = null;
					}
					if(flag){
						renderer = "silverlight";
					}
					break;
				case "canvas":
					if(dojo.global.CanvasRenderingContext2D){
						renderer = "canvas";
					}
					break;
			}
			if(renderer){
				break;
			}
		}
		break;
	}
	if (renderer === 'canvas' && dojo.config.canvasEvent !== false){
		renderer = "canvasWithEvents";
	}

	if(dojo.config.isDebug){
		console.debug("gfxRenderer to load: " + renderer);
	}

	return renderer;
})()], function (config, renderer){
	var gfx = dojo.getObject("dojox.gfx", true);

	gfx.switchTo(renderer); // this would simply be a mixin

	return gfx;
});