40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
// https://stackoverflow.com/questions/4492385/convert-simple-array-into-two-dimensional-array-matrix
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// convert a 1D array into a 2D matrix
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export function toMatrix(array, width) {
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return array.reduce(
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(rows, key, index) =>
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(index % width == 0
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? rows.push([key])
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: rows[rows.length - 1].push(key)) && rows,
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[]
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);
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}
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// convert an image into a black and white image
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export function picToBlackAndWhite(pixels, width, height) {
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return pixels.reduce((acc, pixel, index) => {
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if (index % 4 == 0) {
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const count = pixels[index] + pixels[index + 1] + pixels[index + 2];
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const colour = count >= 255 ? 255 : 1;
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acc.data[index] = colour;
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acc.data[index + 1] = colour;
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acc.data[index + 2] = colour;
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acc.data[index + 3] = 255;
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}
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return acc;
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}, new ImageData(width, height));
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}
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// convert an ImageData into a 2D array of boolean (0, 1) values
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export function picToBoard(pixels, width, height) {
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const flat = pixels.reduce((acc, pixel, index) => {
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if (index % 4 == 0) {
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const count = pixels[index] + pixels[index + 1] + pixels[index + 2];
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const value = count >= 255 ? 1 : 0;
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acc[index] = value;
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}
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return acc;
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}, []);
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return toMatrix(flat, Math.max(width, height));
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}
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