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41 lines
876 B
41 lines
876 B
class FlakesTexture {
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constructor( width = 512, height = 512 ) {
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const canvas = document.createElement( 'canvas' );
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canvas.width = width;
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canvas.height = height;
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const context = canvas.getContext( '2d' );
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context.fillStyle = 'rgb(127,127,255)';
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context.fillRect( 0, 0, width, height );
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for ( let i = 0; i < 4000; i ++ ) {
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const x = Math.random() * width;
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const y = Math.random() * height;
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const r = Math.random() * 3 + 3;
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let nx = Math.random() * 2 - 1;
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let ny = Math.random() * 2 - 1;
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let nz = 1.5;
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const l = Math.sqrt( nx * nx + ny * ny + nz * nz );
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nx /= l; ny /= l; nz /= l;
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context.fillStyle = 'rgb(' + ( nx * 127 + 127 ) + ',' + ( ny * 127 + 127 ) + ',' + ( nz * 255 ) + ')';
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context.beginPath();
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context.arc( x, y, r, 0, Math.PI * 2 );
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context.fill();
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}
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return canvas;
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}
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}
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export { FlakesTexture };
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