render sprite

[fengFanYong]

can i Local refresh,i use renderer.render(),it canvas.clear(0,0,canvas.width,canvas.height),it not i want.

Thank!

[themoonrat]

When creating the renderer, as part of the options you can pass through, make sure these are set

clearBeforeRender: false
preserveDrawingBuffer: true

 

 

[fengFanYong]

i want to  achieve partial refres,hope can clear a sprite or graphics

[xerver]

Render the parts you want to render separately to a render texture, and update that only when necessary

[fengFanYong]

When a sprite move ,i want clear the old sprite ,and render the new sprite

[xerver]

You can't clear a single element of the canvas, after rendering it is just a flat bitmap. If you have parts that change rarely, you can put those in a render texture and not update it every loop.

[fengFanYong]

sorry ，i do not know your mean,i know can't clear a single elemen,i want clear the area of sprite，can your get give a demo? 

[xerver]

You cannot "clear" something off the canvas. You can only clear the entire thing, and render again.

[fengFanYong]

I do not clear something off the canvas, i want only clear the area of sprite,but when i use render.context.clear(),it will clear area of last render element.this clear different from clear of html5.