Using FabricJS ClipTo to Set Image or SVG as Canvas Border

Question

Using FabricJS ClipTo to Set Image or SVG as Canvas Border

Is there a way to apply the clipTo function to an image or SVG in order to constrain objects within the shape or outline?

I'm looking to achieve a similar goal as the user in this post, but the solutions provided were not clear to me.

I have successfully used clipTo with a regular shape, like so:

        var circle = new fabric.Circle({
            radius: 150,
            stroke: '#f55',
            fill: "transparent",
            top: 50,
            left: 50
        });
        circle.selectable = false;
        canvas.add(circle); 
        canvas.clipTo = function (ctx) {
            circle.render(ctx);
        };

You can view a working example in this fiddle: http://jsfiddle.net/o9f4dqjn/1/

However, I have been unable to replicate this functionality with an image. Is there a way to make it work with images?

javascript canvas fabricjs

Answer 1

Answer №1

This solution effectively achieves the desired outcome even without using clipTo.

Source: https://github.com/kangax/fabric.js/issues/2313

Here is my modified fiddle demonstrating the working solution: http://jsfiddle.net/w396uhnv/

Essentially, the background image must be set first, followed by setting

yourobject.globalCompositeOperation = 'source-atop';

on the object.

It is important to note that the background image must have a transparent background with a non-transparent fill.

Although, I managed to make the clipTo method work with SVG specifically, not an image:

        fabric.loadSVGFromURL('http://fabricjs.com/assets/23.svg', function (objects, options) {
            var shape = fabric.util.groupSVGElements(objects, options); 
            canvas.clipTo = function (ctx) {
                shape.render(ctx);
            };
            canvas.renderAll();
        });

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

Answer 2

This solution effectively achieves the desired outcome even without using clipTo.

Source: https://github.com/kangax/fabric.js/issues/2313

Here is my modified fiddle demonstrating the working solution: http://jsfiddle.net/w396uhnv/

Essentially, the background image must be set first, followed by setting

yourobject.globalCompositeOperation = 'source-atop';

on the object.

It is important to note that the background image must have a transparent background with a non-transparent fill.

Although, I managed to make the clipTo method work with SVG specifically, not an image:

        fabric.loadSVGFromURL('http://fabricjs.com/assets/23.svg', function (objects, options) {
            var shape = fabric.util.groupSVGElements(objects, options); 
            canvas.clipTo = function (ctx) {
                shape.render(ctx);
            };
            canvas.renderAll();
        });

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

Using FabricJS ClipTo to Set Image or SVG as Canvas Border

Answer №1

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