Fabric.js 剪辑画布(或对象组)到多边形

2021-12-21 00:00:00 canvas php javascript html fabricjs

我有一个在 Fabric.js 中绘制的画布，我正在向其中添加一组矩形，我想将这些矩形的边缘限制为一个组，以免超出某个区域.

I have a canvas drawn in Fabric.js that i am adding a group of rectangles to, i want to limit the edges of those rectangles as a group to not go outside a certain area.

想象制作一件条纹 T 恤，条纹是用一系列矩形制成的，我需要让它们保持 T 恤的形状.

Imagine making a stripy t-shirt, the stripes are make by using a series of rectangles and i need to keep them to the shape of the t-shirt.

我认为最好将整个画布剪成 T 恤的形状，所以我添加的任何内容都保留在 T 恤内，但我被卡住了.到目前为止，我只剪辑到基本的圆形和矩形.

I think its better to clip the entire canvas to the shape of the t shirt, so anything i add to it remains within the t-shirt but i am stuck. So far i am only clip to basic circles and rectangles.

谢谢

推荐答案

你可以在 canvas.clipTo 中渲染一个形状 :)

You can just render a shape inside canvas.clipTo :)

我刚刚在 kitchensink 中加载了一个随机的 SVG 形状并执行了以下操作:

I just loaded a random SVG shape in kitchensink and did this:

var shape = canvas.item(0);
canvas.remove(shape);
canvas.clipTo = function(ctx) {
  shape.render(ctx);
};

如您所见，整个画布现在都被该 SVG 形状剪裁了.

As you can see, entire canvas is now clipped by that SVG shape.

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