画布图像编辑器 [英] Canvas Image editor

问题描述

我正在尝试使用画布制作图像编辑器，但是在调整旋转图像的大小时遇到​​了一些问题.我调整大小的锚点和图像似乎没有对齐.

I'm trying to make an image editor with canvas, but I ran into some problems with re-sizing an rotated image. My re-size anchors and the image do not seem to line up as they should.

http://jsbin.com/isexig/9/edit#source

(图像在您单击时将旋转，仅用于测试调整大小)

(The image will rotate when you click on it, its just for testing the re-sizing)

有关如何解决此问题的任何线索?

any clues how to fix this?

我发现需要将角度除以pi，但无法使bl起作用，并且锚点仍无法完美匹配=/

I found out that the angle needed to be divided by pi but i fail to get the bl to work and the anchors still do not match up perfectly =/

推荐答案

我发现该组已经旋转，包括角手柄，因此您根本不需要任何三角函数.

I found that the group is already rotated, including the corner handles, so you don't need any trigonometry at all:

http://jsbin.com/abejab/5/edit

switch (activeAnchor.name) {
case "tl":
case "br":
    bl.x = tl.x;
    bl.y = br.y;
    tr.x = br.x;
    tr.y = tl.y;
    break;
case "tr":
case "bl":
    br.x = tr.x;
    br.y = bl.y;
    tl.x = bl.x;
    tl.y = tr.y;
    break;
}
image.x = tl.x;
image.y = tl.y;
image.width = tr.x - tl.x;
image.height = bl.y - tl.y;

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