[javascript-dev] jsui mysketch

On Dec 20, 2007, at 6:27 AM, klaus filip wrote:

> hi
> i am trying to build a multi-2D slider as jsui and hanging at the  
> very basics.
> since i don't want to redraw all sliders i want to use multiple  
> sketches (like sprites).
> below is my basic misunderstanding, the function dsketch works,
> but the function dsketch2 is doing nothing...

Other sketch instances are not visible. They must be drawn into the  
main sketch to see. This is demonstrated in the jsui_imagestuff- 
example.pat, in the sketchpix() js function, which I've included  
below. You can also copy sketch instances pixels to an image for use  
with the other image drawing functions. Hope this gets you on the  
right track.


-Joshua


// the sketchpix function demonstrates rendering into another  
instance of sketch
// and then copying to the main Sketch object, this.sketch. this can  
be useful
// to make sprites, or generating geometry based alpha masks, etc.
function sketchpix(x,y)
{
	// create a new instance of sketch
	var rendersketch = new Sketch(64,64);
	
	// draw some things in new sketch instance
	with (rendersketch) {
		default2d();
		glcolor(0,1,0,1);
		moveto(0,0);
		circle(0.7);
		glcolor(1,0,0,1);
		roundedplane(0.1,0.3);
	}
		
	// copy to main sketch instance
	with (sketch) {
		glclearcolor(0,0,1,1);
		glclear();
		if (myblend)
			glenable("blend");
		else
			gldisable("blend");
		copypixels(rendersketch,x,y);
	}
	refresh();
}