30度翻转影像? [英] Flip images at 30 degrees?
本文介绍了30度翻转影像?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
vc.scale(-1, -1)
但是有没有办法在30度对称线上翻转图像? p>
解决方案
是的,您可以使用 rotate()画布方法:
var ctx = document.getElementById(myCanvas)。getContext(2d); var img = new Image(); img.src =http:// photos .the-scientist.com / articleImages / 48000 / 48607-1-t.jpg; img.onload = function(){ctx.rotate(30 * Math.PI / 180); ctx.translate(ctx.canvas.width / 2,ctx.canvas.height / 2); ctx.scale(1,-1); ctx.drawImage(img,-65,65);}
< canvas id =myCanvaswidth =300height =300>
In canvas I know that I can flip images horizontally and vertically by doing this:
vc.scale(-1, -1)
But is there some way to flip an image along a 30 degree symmetry line?
解决方案
Yes, you can accomplish this using the rotate() method of canvas :
var ctx = document.getElementById("myCanvas").getContext("2d");
var img = new Image();
img.src = "http://photos.the-scientist.com/articleImages/48000/48607-1-t.jpg";
img.onload = function() {
ctx.rotate(30 * Math.PI / 180);
ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
ctx.scale(1, -1);
ctx.drawImage(img, -65, 65);
}
<canvas id="myCanvas" width="300" height="300">
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