Fabric.js Clip Canvas (or object group) To Polygon

Question

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.

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.

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.

Thanks

Solution

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

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);
};

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

Comments

[kangax]

@simmisimmi it's a first item on canvas

[MANISHDAN LANGA]

@kangax can u give me example for it or any fiddle.

[MANISHDAN LANGA]

can we clipped by the image shape to image shape

[Innodel]

Canvas clipping is working perfect but this clipTo function is also clipping canvas' backgroundimage, I don't want its backgroundImage to be clipped.

[Khawer Zeshan]

This clipTo does not work if there are multiple paths in the SVG. See this question.

[Bhupendra Jadeja]

i did the same but i am getting error that shape is not defined