I have a digital clock that is running and being updated every 10 milliseconds. In each draw call I am using this:
var gradient = clockContext.createLinearGradient(0, 0, 0, this.digitWidth);
gradient.addColorStop(0.15, "rgb(255, 252, 52)");
gradient.addColorStop(0.15, "rgb(245, 127, 26)");
gradient.addColorStop(1, "rgb(248, 159, 52)");
clockContext.fillStyle = gradient;
clockContext.lineWidth = 1;
clockContext.lineStyle = "#000000";
clockContext.fillText(time, (this.digitWidth * i) + e + s, 46);
clockContext.strokeText(time, (this.digitWidth * i) + e + s, 46);
Now is this quicker or slow than creating a PNG of the numbers 0 - 9, caching each one and then using drawImage()
on each draw call?
drawImage
is always, always faster than fillText
. It can be 100+ times faster depending on how the text is constructed.
I did a meandering analysis here not long ago:
http://simonsarris.com/blog/322-canvas-drawtext-considered-harmful
Here's a simple jsperf example: http://jsperf.com/image-vs-text
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