https://developers.weixin.qq.com/miniprogram/en/dev/api/canvas/CanvasContext.setTransform.html
CanvasContext.setTransform(number scaleX, number skewX, number skewY, number scaleY, number...
the doc for Weixin develoers
numberscalexscaley
https://www.w3schools.com/csSref/func_skewy.php
CSS skewY() function
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and...
cssfunction
https://miniapp.bilibili.com/small-app-doc/api/canvas/CanvasContext.transform
CanvasContext.transform(number scaleX, number skewX, number skewY, number scaleY, number...
transformnumberscalexscaley