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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| const canvas = document.createElement("canvas"); | ||
| const ctx = canvas.getContext("2d")!; | ||
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|
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| document.body.append(canvas); | ||
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| let rects: { | ||
| x: number; | ||
| y: number; | ||
| delay: number; | ||
| duration: number; | ||
| a: number; | ||
| row: number; | ||
| col: number; | ||
| }[] = []; | ||
| let SIZE = 0; | ||
| let SPACE = 0; | ||
| let width = 0; | ||
| let height = 0; | ||
| let columns = 0; | ||
| let rows = 0; | ||
| let mouseX = -1; | ||
| let mouseY = -1; | ||
| let smoothMouseX = 0; | ||
| let smoothMouseY = 0; | ||
| let img: ImageData; | ||
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| function onMouseMove(e: MouseEvent) { | ||
| mouseX = e.pageX; | ||
| mouseY = e.pageY; | ||
| } | ||
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| window.addEventListener( | ||
| "mousemove", | ||
| (e) => { | ||
| onMouseMove(e); | ||
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| smoothMouseX = mouseX; | ||
| smoothMouseY = mouseY; | ||
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| window.addEventListener("mousemove", onMouseMove); | ||
| }, | ||
| { once: true } | ||
| ); | ||
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| function onResize() { | ||
| rects = []; | ||
| width = window.innerWidth; | ||
| height = window.innerHeight; | ||
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|
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| if (width < 768) { | ||
| SIZE = 2; | ||
| SPACE = 2; | ||
| } else { | ||
| SIZE = 3; | ||
| SPACE = 2; | ||
| } | ||
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| canvas.width = width; | ||
| canvas.height = height; | ||
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| ctx.fillStyle = "#fff"; | ||
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| columns = Math.ceil(width / SIZE / SPACE); | ||
| rows = Math.ceil(height / SIZE / SPACE); | ||
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| for (let i = 0; i < columns * rows; i++) { | ||
| const col = i % columns; | ||
| const row = Math.floor(i / columns); | ||
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| rects.push({ | ||
| x: col * SPACE * SIZE, | ||
| y: row * SPACE * SIZE, | ||
| delay: Math.random() * 15000, | ||
| duration: Math.random() * 5000 + 1000, | ||
| a: 25, | ||
| row, | ||
| col, | ||
| }); | ||
| } | ||
|
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| img = ctx.createImageData(width, height); | ||
| } | ||
|
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| let then = performance.now() * -20; | ||
| function animate(now: number) { | ||
| requestAnimationFrame(animate); | ||
|
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| const diff = now - then; | ||
| then = now - diff; | ||
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| const data = img.data; | ||
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| if (mouseX !== -1) { | ||
| smoothMouseX += (mouseX - smoothMouseX) * 0.13; | ||
| smoothMouseY += (mouseY - smoothMouseY) * 0.13; | ||
| } | ||
|
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| const dd = Math.min( | ||
| Math.max( | ||
| Math.hypot(smoothMouseX - mouseX, smoothMouseY - mouseY) * 0.7, | ||
| 25 | ||
| ), | ||
| 140 | ||
| ); | ||
|
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| for (let i = 0; i < rects.length; i++) { | ||
| const r = rects[i]; | ||
| const time = r.duration + r.delay; | ||
| const delta = diff % time; | ||
| const finished = delta > time; | ||
|
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| let alpha = delta > r.delay && !finished ? 50 : 25; | ||
|
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| if (mouseX != -1 && Math.random() > 0.9) { | ||
| const d = Math.hypot(smoothMouseX - r.x, smoothMouseY - r.y); | ||
| if (d < dd * Math.random()) { | ||
| alpha = 100 * Math.random() + 25; | ||
| } | ||
| } | ||
|
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| if (r.a > 50) { | ||
| r.a -= 1; | ||
| alpha = r.a; | ||
| } | ||
|
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| for (let j = 0; j <= SIZE; j++) { | ||
| for (let k = 0; k <= SIZE; k++) { | ||
| // const n = (r.x + j + (r.y + k + j) * width) * 4; | ||
| const n = (r.x + j + (r.y + k) * width) * 4; | ||
| data[n] = 255; | ||
| data[n + 1] = 255; | ||
| data[n + 2] = 255; | ||
| data[n + 3] = alpha; | ||
| } | ||
| } | ||
|
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| r.a = alpha; | ||
| } | ||
|
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| ctx.putImageData(img, 0, 0); | ||
| } | ||
|
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| function start() { | ||
| onResize(); | ||
| requestAnimationFrame(animate); | ||
| } | ||
|
|
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| addEventListener("resize", onResize); | ||
| document.fonts.ready.then(start); |
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