Created
June 3, 2018 12:42
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Mozilla arch JS code
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function curveInArchCoords(col, rows, cols) { | |
const mathX = col / cols * 2 * Math.PI; | |
const mathY = Math.cos(mathX); | |
const archY = (1 + mathY) / 2 * rows; | |
return archY; | |
} | |
function setFrame(frame, rows, cols, colOffset) { | |
for (const i of frame) { | |
frame[i] = 0; | |
} | |
for (let col = 0; col < cols; col++) { | |
const row = Math.floor(curveInArchCoords(col + colOffset, rows, cols)); | |
const offset = (row * cols + col) * 3; | |
const red = col / cols * 255; | |
const green = 0; | |
const blue = row / rows * 255; | |
frame[offset] = red; | |
frame[offset + 1] = green; | |
frame[offset + 2] = blue; | |
} | |
} | |
export function transform(buffer, rows, cols, frameCount, fps, isFirst) { | |
const frameSize = 3 * rows * cols; | |
for (let i = 0; i < frameCount; i++) { | |
const second = i / fps; | |
const frame = new Uint8Array(buffer, frameSize * i, frameSize); | |
setFrame(frame, rows, cols, second * 4); | |
} | |
} | |
export default function () { | |
return { transform }; | |
} |
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