Created
June 15, 2018 04:26
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Canvas 2d Mask
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| const size = 512 | |
| const size2 = size / 2 | |
| const c = document.createElement('canvas') | |
| c.width = size | |
| c.height = size | |
| document.body.appendChild(c) | |
| const ctx = c.getContext('2d') | |
| ctx.fillStyle = '#ff0000' | |
| ctx.fillRect(0, 0, size, size) | |
| // applying the circle mask | |
| ctx.globalCompositeOperation = 'destination-in' | |
| ctx.fillStyle = '#000000' | |
| ctx.arc(size2, size2, size2, 0, 2*Math.PI) | |
| ctx.fill() |
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