Drawing on a texture pixel by pixel

[Alfredo]

Hi guys,

how can I draw on a texture pixel by pixel? I cannot find it in the documentation.

[xerver]

Draw to a canvas, and use the canvas as the texture.

[mrBRC]

@Xerver, What do you mean exactly?

how do you use a separate canvasContext as a PIXI.Texture or PIXI.BaseTexture?







 

[mrBRC]

nevermind.. I found a method to do this.. however, it is not immediately obvious how you can bind and update the texture when the canvas changes.. 


at any rate.. the following code sample demonstrates how to use a separate canvas as a PIXI.BaseTexture

// I created a canvas element with the id "drawpanel" on my page.// My renderer is WebGL, function LoadCanvasImage() {   var c = document.getElementById("drawpanel");   pixiCanvasRenderer = new PIXI.CanvasRenderer(c.width,c.height,c,true);		   var grd=pixiCanvasRenderer.context.createRadialGradient(75,50,5,90,60,100);       grd.addColorStop(0,"red");       grd.addColorStop(1,"white");   // Fill with gradient       pixiCanvasRenderer.context.fillStyle=grd;       pixiCanvasRenderer.context.fillRect(10,10,150,100);   var source = new Image();       source.src = pixiCanvasRenderer.view.toDataURL();   // in this instance, 'Canvas'.toDataURL returns "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAYE0lEQ…TWsFPLE2MExosAgTXenPKMGIFhI0BgDTu1PDFGYLwI/A9PJKWFOlTAfAAAAABJRU5ErkJggg=="   // reference http://www.html5canvastutorials.com/advanced/html5-canvas-save-drawing-as-an-image/    var BaseTexture = new PIXI.BaseTexture(source, PIXI.scaleModes.LINEAR);   var Texture = new PIXI.Texture(BaseTexture);   var mySprite = new PIXI.Sprite(Texture);   stage.addChild(mySprite);}

I'm not showing the Stage initialization here, or the animation loop.. but that should be easy enough to reference and implement in the pixi examples on github.

 

EDIT: Added toDataURL instance data, and an article reference on it.

Edited July 17, 2014 by mrBRC

[Alfredo]

Thanks, solved.

[Mat Groves]

Hey guys easiest way is to use:

// create a regular canvasvar canvas = document.create('canvas')// make your canvas awesome...// then use it as a texture:var canvasTexture = PIXI.Texture.fromCanvas(canvas);var sprite = new PIXI.Sprite(canvasTexture)

[Alfredo]

 

Hey guys easiest way is to use:

// create a regular canvasvar canvas = document.create('canvas')// make your canvas awesome...// then use it as a texture:var canvasTexture = PIXI.Texture.fromCanvas(canvas);var sprite = new PIXI.Sprite(canvasTexture)

Thanks, much cleaner, I have one other question, why doing setTexture  works using canvas, and it doesn't using WebGL?