he4et/browser-milje-2077
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test.html: separate logic

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He4eT 2024-08-15 01:26:24 +02:00
commit 26dccc0f71
1 changed files with 32 additions and 19 deletions
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test.html
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@ -8,23 +8,11 @@
body, html {
margin: 0;
padding: 0;
}
body {
display: flex;
justify-content: center;
background: gray;
}
canvas {
transform: translateY(-50%) rotate(45deg);
filter: drop-shadow(0px 0px 10px rgba(60,60,60,0.5));
}
</style>
</head>
<body>
<canvas id="carpetCanvas" width="512" height="512"></canvas>
<script>
// LCG using GCC's constants
// https://en.wikipedia.org/wiki/Linear_congruential_generator
@ -69,7 +57,7 @@
}
}
}
return matrix.flat()
return matrix
}
// https://stackoverflow.com/questions/3448347/how-to-scale-an-imagedata-in-html-canvas
@ -95,28 +83,53 @@
return scaled
}
const drawOnCanvas = (matrix, size) => {
const canvas = document.getElementById('carpetCanvas')
const getCanvas = (size) => {
const canvas = document.createElement('canvas')
canvas.width = size
canvas.height = size
Object.entries({
'position': 'fixed',
'top': '0%',
'left': '50%',
'margin': '0 auto',
'transform': 'translateY(-50%) translateX(-50%) rotate(45deg)',
'filter': 'drop-shadow(0px 0px 10px rgba(60,60,60,0.5))',
'zIndex': '9999',
}).forEach(([key, value]) => { canvas.style[key] = value })
return canvas
}
const matrixToCanvas = (matrix, size, scaleFactor) => {
const flatMatrix = matrix.flat()
const canvas = getCanvas(size * scaleFactor)
const ctx = canvas.getContext('2d')
const imageData = ctx.createImageData(size, size)
for (let i = 0; i < matrix.length; i++) {
const value = matrix[i] * 255
for (let i = 0; i < flatMatrix.length; i++) {
const value = flatMatrix[i] * 255
const index = i * 4
imageData.data[index + 0] = value // Red
imageData.data[index + 1] = value // Green
imageData.data[index + 2] = value // Blue
imageData.data[index + 3] = value ? 255 : 0 // Alpha (fully opaque)
}
ctx.putImageData(scaleImageData(imageData, 16, ctx), 0, 0)
ctx.putImageData(scaleImageData(imageData, scaleFactor, ctx), 0, 0)
return canvas
}
const gridSize = 3
const patternSize = 16
const scaleFactor = 16
const randomSeed = new Date()
drawOnCanvas(generatePattern(patternSize, gridSize, randomSeed), patternSize * 2)
const pattern = generatePattern(patternSize, gridSize, randomSeed)
const miljeCanvas = matrixToCanvas(pattern, patternSize * 2, scaleFactor)
document.body.appendChild(miljeCanvas)
</script>
</body>
</html>