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You change the link in the img tag, then copy and paste the code to your local test. But to be honest, using background tiling to achieve drawing is very difficult to control.
Another suggestion I give you is to use drawImage to draw it first, and then use globalCompositeOperation to intercept the circle.

<img src="AN_1.png"><br/>
<canvas id="canvas" width="300" height="300" style="background:#000;"></canvas>
<script type="text/javascript">
var cv = document.getElementById('canvas'),
    cxt = cv.getContext('2d'),
    img = document.querySelector("img");

var pt = cxt.createPattern(img,"repeat");
cxt.fillStyle = pt;

cxt.save();
cxt.arc(canvas.width/2,canvas.height/2,100,0,Math.PI * 2, true);
cxt.fill();
cxt.restore();
</script>

grd.addColorStop(0,"#eee");
grd.addColorStop(1,ballArray[i].color);
cxt.fillStyle=grd;
cxt.arc(ballArray[i].x, ballArray[i].y, ballArray[i].r, 0, Math.PI * 2, true);

Written as a gradient like this... the effect is almost the same, although it is very ugly. .

Update...

Gradient Random Color Random Transparency

It feels like your commented out code is just that

// var pat=cxt.createPattern(img,"no-repeat");
// cxt.fillStyle = pat;

This is a demo written by me, but the compatibility has not been tested

https://codepen.io/jackpan/pe...