Please teach WeChat Mini Programs drawImage and clip how to cut a picture into a circle as an avatar and position it.

ask for advice, such as the title, thank you.

Javascript
Mar.16,2021

I am using Mini Program's canvas, but it is similar to that of the web page. The idea is to first locate a circular hole in the canvas canvas, and then the square picture happens to be in that position, so it looks like the picture is round.
here is the code 

context.save();
context.beginPath();
// 50  90  x  y 25 
context.arc(50, 90, 25, 0, 2*Math.PI);
context.closePath();
//  50 90
context.clip();
// res.tempFilePath  wx.downloadFile 
//  drawImage  canvas  x y 
context.drawImage(res.tempFilePath, 25, 65, 50, 50);
context.restore();
context.draw(true, that.getTempFilePath);

according to the above, it is very clear and easy to display the round avatar, and the location is also clear.

globalCompositeOperation

it's better to cut a circle in this way

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