Consultant Designer & Developer
{
// Sets the random see so that, when `showGrid` is changed
// new points are not generated.
random.setSeed(seed + randomize);
clear();
drawLines(linesSet);
if (debug) {
drawBounds();
drawSquares(linesSet);
drawPts(linesSet);
}
return `Iteration: ${randomize}`;
}
lineLengthUV = 1 / 8
linesSet = {
randomize;
const set = math
.linspace(rows, true)
.map((v, j) =>
math.linspace(cols, true).map((u, i) => {
const index = j * cols + i;
const lineDirections = getDirections(index);
const minDistanceUV = math.inverseLerp(1, 4, lineDirections.length);
const minDistance = math.lerp(1 / 15, 1 / 25, minDistanceUV);
const pts = poissonSampling(1, 1, { minDistance });
const shuffledPts = random.shuffle(pts);
let lines = [];
const chunkSize = Math.floor(pts.length / lineDirections.length);
const chunkedPts = chunk(shuffledPts, chunkSize);
lineDirections.forEach((dir, i) => {
let dirLines = generateLinesAtPts(chunkedPts[i], dir);
dirLines = geom.clipPolylinesToBox(
dirLines,
[0, 0, 1, 1],
false,
false
);
dirLines = dirLines.map((l) => [...l, dir]);
lines = [...lines, ...dirLines];
});
return {
midpoint: [u, v],
pts,
lines
};
})
)
.flat();
return set;
}
generateLinesAtPts = (pts, direction) => {
const angle = getAngleFromDirection(direction);
const lines = pts.map(([u, v]) => {
const u1 = u + lineLengthUV * Math.cos(angle);
const v1 = v + lineLengthUV * Math.sin(angle);
const u2 = u - lineLengthUV * Math.cos(angle);
const v2 = v - lineLengthUV * Math.sin(angle);
return [
[u1, v1],
[u2, v2]
];
});
return lines;
}
drawBounds = () => {
ctx.beginPath();
ctx.strokeStyle = palette.debug;
ctx.lineCap = "round";
ctx.lineWidth = 1;
ctx.rect(marginLeft, marginTop, gridWidth, gridHeight);
ctx.stroke();
}
uv2xy = (u, v, xMin, xMax, yMin, yMax) => {
return [math.lerp(xMin, xMax, u), math.lerp(yMin, yMax, v)];
}
drawLines = (linesSet) => {
linesSet.forEach(({ midpoint, lines }) => {
const { x, y, size } = getSquareBounds(...midpoint);
lines.forEach((l) => {
let [[u1, v1], [u2, v2], dir] = l;
let [x1, y1] = uv2xy(u1, v1, x, x + size, y, y + size);
let [x2, y2] = uv2xy(u2, v2, x, x + size, y, y + size);
drawLineWithOvershoot(
x1,
y1,
x2,
y2,
lineWidth,
palette[getColorFromDirection(dir)]
);
});
});
}
drawSquares = (linesSet) => {
ctx.beginPath();
ctx.strokeStyle = palette.debug;
ctx.lineCap = "round";
ctx.lineWidth = 1;
for (let i = 0; i < cols; i++) {
for (let j = 0; j < rows; j++) {
const index = i * rows + j;
const { x, y, size } = getSquareBounds(...linesSet[index].midpoint);
ctx.rect(x, y, size, size);
}
}
ctx.stroke();
}
drawPts = (linesSet) => {
ctx.beginPath();
ctx.fillStyle = palette.debug;
linesSet.forEach(({ midpoint, pts }) => {
const { x, y, size } = getSquareBounds(...midpoint);
pts.forEach(([u, v]) => {
const px = math.lerp(x, x + size, u);
const py = math.lerp(y, y + size, v);
ctx.moveTo(px, py);
ctx.arc(px, py, 1, 0, 2 * Math.PI);
});
});
ctx.fill();
}
getSquareBounds = (u, v) => {
const cx = math.lerp(
marginLeft + cellSize / 2,
marginLeft + gridWidth - cellSize / 2,
u
);
const cy = math.lerp(
marginTop + cellSize / 2,
marginTop + gridHeight - cellSize / 2,
v
);
return {
x: cx - cellSize / 2,
y: cy - cellSize / 2,
size: cellSize
};
}
directions = ({
vertical: { color: "yellow", angle: Math.PI / 2 },
horizontal: { color: "black", angle: 0 },
diagDown: { color: "blue", angle: Math.PI / 4 },
diagUp: { color: "red", angle: -Math.PI / 4 }
})
palette = ({
paper: `hsla(42, 32%, 95%, 1.00)`, //`hsl(26, 26%, 98%)`,
black: `hsl(26,15%,15%)`,
yellow: `hsla(44, 79%, 58%, 1.00)`,
red: `hsla(5, 55%, 45%, 1.00)`,
blue: `hsla(214, 62%, 44%, 1.00)`,
debug: "#FF00FF"
})
getAngleFromDirection = (dir) => directions[dir].angle || 0
getColorFromDirection = (dir) => directions[dir].color || 0
getDirections = (index) =>
isShowingSingle()
? random.pick(allDirectionCombinations)
: allDirectionCombinations[index] || []
lineWidth = isShowingSingle() ? 1.5 : 1
drawLineWithOvershoot = (...args) => {
const [x1, y1, x2, y2, lineWidth, ...rest] = args;
const m = slope(x1, y1, x2, y2);
const angle = Math.atan(m);
const maxExtU = 1 - math.clamp01(math.inverseLerp(5, 1, lineWidth));
const maxExt = lineWidth * math.lerp(4, 0.5, maxExtU);
const ext1 = random.value();
const ext2 = random.value();
let xe1 = x1,
ye1 = y1,
xe2 = x2,
ye2 = y2;
if (m >= 0) {
// line move upwards when x moves from left to right
xe1 = x1 - maxExt * ext1 * Math.cos(angle);
ye1 = y1 - maxExt * ext1 * Math.sin(angle);
xe2 = x2 + maxExt * ext2 * Math.cos(angle);
ye2 = y2 + maxExt * ext2 * Math.sin(angle);
}
drawLine(xe1, ye1, xe2, ye2, lineWidth, ...rest);
}
ratio = rows / cols
width
maxSqSize = Math.min(width / cols, height / rows)
maxGridWidth = maxSqSize * cols
maxGridHeight = maxSqSize * rows
maxSize = Math.min(height, width)
gridWidth = width - 2 * marginLeft
gridHeight = height - 2 * marginTop
cellSize = {
const cellWidth = gridHeight / rows;
return isShowingSingle() ? cellWidth : cellWidth - cellPadding / 2;
}
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