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I have 3 layers of canvas – 1 is matrix, 2 & 3 is graphics, how to preserve them in one image?
<div style="position: relative;">
<canvas id="matix" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer1" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer2" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 1;"></canvas>
</div>
You can draw one canvas into another with
ctx.drawImage(other_canvas,0,0)If you do that in the right order, you will have all the canvas contents correctly layered in one of them.
If you want to save the image, you can call
canvas.toDataURL()to get the contents as a base64 encoded PNG file.