boguz / geometric-paint-worklet

A customizable CSS Paint Worklet that renders geometric figures

geometric-paint-worklet

A customizable CSS Paint Worklet that renders geometric figures to the background of any element

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Table of contents

1. What are CSS Paint Worklets
2. How to use
3. How to customize
4. CSS Variables
5. Examples

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🧪 1. What are CSSPaint Worklets?

CSS Paint Worklets are part of the CSS Paint API (also known as “CSS Custom Paint” or “Houdini’s paint worklet”) which allow us to programmatically generate an image that we can then use on any CSS property that expects an image (background-image, border-image, ...).

CSS Paint API article on the developers.google.com

⚠️ CSS Paint API features are experimental: Maybe you need to take a look at the CSS Paint Polyfill

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📦 2. How to use

ℹ️ If you want to use a CDN, skip steps 1 and 2 and instead add <script scr="https://unpkg.com/geometric-paint-worklet"></script> to your index.html

1. You can get the worklet js file from one of the following methods:

   1.1. Copy the dist/geomatric-paint-worklet.js file into your project

   1.2. Install with npm npm install geometric-paint-worklet

2. Import the worklet file on your index.html head:

<script src="node_modules/geometric-paint-worklet/dist/geometric-paint-worklet.js"></script>

3. Add the paint worklet module to your index.html:

<script>
    CSS.paintWorklet.addModule('node_modules/geometric-paint-worklet/dist/geometric-paint-worklet.js');
</script>

4. Use the GeometricPaintWorklet on any Element. Ex:

.my-element {
    background-image: paint(geometricPaintWorklet);
}

5. Customize it to your needs using custom CSS Variables (see below)

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💈 3. How to customize

You can customize it using css variables. Ex:

.nice-element {
    --gpw-number-of-shapes: 32;
    --gpw-shape-size: 16;
    --gpw-line-width: 2;
    --gpw-possible-colors: ['#E57373', 'pink', 'rgb(100, 150, 34)'];
    --gpw-opacity: .25;
    
    background-image: paint(geometricPaintWorklet);
}

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🦖 4. CSS Variables

Variable	Value Type	Default
--gpw-number-of-shapes	number	12
--gpw-shape-size	number	40
--gpw-line-width	number	40
--gpw-possible-colors	array	['#FFF59D', '#FFAB91', '#80DEEA', '#E57373']
--gpw-fill-shapes	boolean	false
--gpw-opacity	number	1

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📸 5. Examples

1. Default Settings

.my-element {
    background-image: paint(geometricPaintWorklet);
}

2. Small shapes

.my-element {
    --gpw-number-of-shapes: 80;
    --gpw-shape-size: 6;
    --gpw-line-width: 6;
    --gpw-fill-shapes: false;
    --gpw-opacity: .5;

    background-image: paint(geometricPaintWorklet);
}

3. Overlapping translucent forms

.my-element {
    --gpw-number-of-shapes: 24;
    --gpw-shape-size: 256;
    --gpw-line-width: 1;
    --gpw-fill-shapes: true;
    --gpw-opacity: .25;

    background-image: paint(geometricPaintWorklet);
}

4. Large thin borders

.my-element {
    --gpw-number-of-shapes: 8;
    --gpw-shape-size: 240;
    --gpw-line-width: 1;
    --gpw-possible-colors: ['#ffffff'];
    
    background-image: paint(geometricPaintWorklet);
}

5. Solid colourful shapes

.my-element {
    --gpw-number-of-shapes: 12;
    --gpw-shape-size: 40;
    --gpw-line-width: 40;

    background-image: paint(geometricPaintWorklet);
}

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😀 Have fun with it, and let me know if you use it somewhere...