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September 7, 2024 17:01
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How to create a tiled background image in litecanvas
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| let bg, tile | |
| litecanvas() | |
| function init() { | |
| loadImage('https://placehold.co/128', (res) => { | |
| tile = res | |
| bg = paint(WIDTH, HEIGHT, () => { | |
| // cache the tiled image | |
| tiled(0, 0, WIDTH, HEIGHT, tile) | |
| }) | |
| }) | |
| x = y = 0 | |
| } | |
| // optional: resize and cache again the tiled image | |
| function resized() { | |
| if (!bg) return | |
| bg = paint(WIDTH, HEIGHT, () => { | |
| // cache the tiled image | |
| tiled(0, 0, WIDTH, HEIGHT, tile) | |
| }) | |
| } | |
| function draw() { | |
| if (LOADING) return; | |
| image(x, y, bg) | |
| } | |
| function tiled(x, y, width, height, image) { | |
| const _ctx = ctx(), | |
| pattern = _ctx.createPattern(image, "repeat"); | |
| pattern.setTransform(new DOMMatrix([1,0,0,1,x, y])); | |
| _ctx.fillStyle = pattern; | |
| _ctx.fillRect(x, y, width, height); | |
| } |
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Demo:
https://litecanvas.js.org?c=eJyNUl1LwzAUfc%2BvuO7FFMK6%2BSSTCcJkG6gTHfggIlmatYEsLemd25T9d2%2FSKvMDkTYpOTfn3HOSWo2wyAWgsZoxa1Ar6V5kzRPGlmun0JQOjDPIE3hjALaU2XQlc82PC8SqHqRpZaXSRWmzrirT%2FsnpsQDudZ3A8DxSIIrDEAiMy0VOi0oah%2FxhOppPBEwup%2BPJnHgHJIA0BSVVoQHDII0MTGjdliPCewLo%2FaYTSknctg%2BfOG2p6Y5Gj%2B0ZI%2BmyCtmkHQRf5lWDdFnbT%2BZk7kfXz%2BNo9mftiZgl8KNFnhCMa%2B%2FYf%2FP9me4f2SjU%2FuCOMi83B46uZhej6c34w9VZgOO1bQXsBFn8ym76NbWNybAQUGiTFygaWiOsSlcjPCsMZ0kzT0R0W0lE7R2BodZVXkvUtw3II19Ax%2BuK4E4SrLSEbq1x7qWrl6Vfcac3MJpdX0v0Zssf%2B6JHT18EU09JpEX1pbH2Hnfxj2p1vtTutMLfkpDCnr0Dcc7f%2BQ%3D%3D
Preview:
