Canvas image export

exportImage(event) {				
		event.stopPropagation();
		
		this.ctx.fillStyle = "#333333";
		this.ctx.font = 'bold 16px Helvetica, Arial, sans-serif';
		this.ctx.textBaseline = "top";
		var textSize = this.ctx.measureText("esimov.com");
		//this.ctx.fillText("esimov.com", this.size - textSize.width - 10, 5);
				
		//retrieve canvas image as data URL:		
		var dataURL = this.canvas.toDataURL("image/png");
		//open a new window of appropriate size to hold the image:
		var imageWindow = window.open("", "DeJongAttractor", "left=0,top=0,width=" + this.size + ",height=" + this.size + ",toolbar=0,resizable=0");
		//write some html into the new window, creating an empty image:
		imageWindow.document.write("<title>DeJong Attractor</title>");
		imageWindow.document.write("<img id='exportImage'"
									+ " alt=''"
									+ " height='" + this.size + "'"
									+ " width='"  + this.size  + "'"
									+ " style='position:absolute;left:0;top:0'/>");
		imageWindow.document.close();
		//copy the image into the empty img in the newly opened window:
		var exportImage = imageWindow.document.getElementById("exportImage");
		exportImage.src = dataURL;
	}