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canvas-graph.js
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canvas-graph.js
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import canvasSketch from "canvas-sketch";
import {
findCuspOKLCH,
gamutMapOKLCH,
MapToAdaptiveCuspL,
A98RGBGamut,
convert,
DisplayP3Gamut,
OKLCH,
Rec2020Gamut,
sRGBGamut,
degToRad,
constrainAngle,
floatToByte,
isRGBInGamut,
clampedRGB,
} from "../src/index.js";
import arrayAlmostEqual from "./almost-equal.js";
const settings = {
dimensions: [768, 768],
animate: false,
playbackRate: "throttle",
fps: 2,
attributes: {
colorSpace: "display-p3",
},
};
const sketch = ({ width, height }) => {
return ({ context, width, height, frame, playhead }) => {
const { colorSpace = "srgb" } = context.getContextAttributes();
const gamut = colorSpace === "srgb" ? sRGBGamut : DisplayP3Gamut;
const mapping = MapToAdaptiveCuspL;
context.fillStyle = "gray";
context.fillRect(0, 0, width, height);
const H = 264.1;
// const H = constrainAngle((frame * 45) / 2);
// console.time("map");
// console.profile("map");
const tmp = [0, 0, 0];
const pixels = new Uint8ClampedArray(width * height * 4).fill(0xff);
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const u = x / width;
const v = y / height;
const [L, C] = UVtoLC([u, v]);
let oklch = [L, C, H];
let rgb = convert(oklch, OKLCH, gamut.space, tmp);
if (!isRGBInGamut(rgb, 0)) {
rgb[0] = 0.25;
rgb[1] = 0.25;
rgb[2] = 0.25;
// if we wanted to fill the whole space with mapped colors
// rgb = gamutMapOKLCH(oklch, gamut, sRGB, tmp, mapping);
}
const idx = x + y * width;
pixels[idx * 4 + 0] = floatToByte(rgb[0]);
pixels[idx * 4 + 1] = floatToByte(rgb[1]);
pixels[idx * 4 + 2] = floatToByte(rgb[2]);
}
}
context.putImageData(
new ImageData(pixels, width, height, { colorSpace }),
0,
0
);
// console.profileEnd("map");
// console.timeEnd("map");
const A = [1, 0];
const B = [0, 0];
const lineWidth = width * 0.003;
context.lineWidth = lineWidth;
const gamuts = [
{ defaultColor: "yellow", gamut: sRGBGamut },
{ defaultColor: "palegreen", gamut: DisplayP3Gamut },
{ defaultColor: "red", gamut: Rec2020Gamut },
{ defaultColor: "pink", gamut: A98RGBGamut },
];
const hueAngle = degToRad(H);
const a = Math.cos(hueAngle);
const b = Math.sin(hueAngle);
for (let { gamut: dispGamut, defaultColor } of gamuts) {
const gamutCusp = findCuspOKLCH(a, b, dispGamut);
const gamutTri = [A, gamutCusp, B];
drawLCTriangle(
context,
gamutTri,
gamut === dispGamut ? "white" : defaultColor
);
}
context.strokeStyle = "white";
const steps = 64;
for (let i = 0; i < steps; i++) {
// get some LC point that is very likely to be out of gamut
const ox = 0.5;
const oy = 0.5;
const r = 1;
const t = (i / steps) * degToRad(360) + degToRad(-180);
const xy = [Math.cos(t) * r + ox, Math.sin(t) * r + oy];
const [L, C] = UVtoLC(xy);
const oklch = [L, C, H];
const lc = oklch.slice(0, 2);
const mapped = gamutMapOKLCH(oklch, gamut, OKLCH, tmp, mapping);
const radius = width * 0.01;
const didChange = !arrayAlmostEqual(mapped, oklch);
if (didChange) {
context.globalAlpha = 0.5;
drawLCPoint(context, lc, radius / 2, "white");
context.beginPath();
context.lineTo(...LCtoXY(lc));
context.lineTo(...LCtoXY(mapped));
context.stroke();
context.globalAlpha = 1;
drawLCPoint(context, mapped.slice(0, 2), radius / 4, "white");
} else {
drawLCPoint(context, lc, radius);
}
}
const fontSize = width * 0.03;
const boxHeight = fontSize * gamuts.length;
const pad = width * 0.05;
const padleft = width * 0.1;
context.fillStyle = "black";
for (let i = 0; i < gamuts.length; i++) {
const { gamut: dispGamut, defaultColor } = gamuts[i];
const curColor = dispGamut === gamut ? "white" : defaultColor;
context.font = `${fontSize}px monospace`;
context.textAlign = "right";
context.textBaseline = "top";
context.fillStyle = curColor;
const x = width - pad - padleft;
const y = height - boxHeight + i * fontSize - pad;
context.fillText(dispGamut.space.id, x, y);
context.beginPath();
context.lineTo(x + fontSize / 2, y + fontSize * 0.4);
context.lineTo(x + padleft, y + fontSize * 0.4);
context.strokeStyle = curColor;
context.stroke();
}
context.fillStyle = "white";
context.fillText(
`Hue: ${H.toFixed(0)}º`,
width - pad,
height - pad - boxHeight - fontSize * 2
);
};
function LCtoXY(okLC) {
const x = (okLC[1] / 1) * width;
const y = (1 - okLC[0]) * height;
return [x, y];
}
function XYtoLC(xy) {
return UVtoLC([xy[0] / width, xy[1] / height]);
}
function UVtoLC(xy) {
const L = 1 - xy[1];
const C = xy[0] * 1;
return [L, C];
}
function drawLCTriangle(context, triangle, color = "white") {
context.beginPath();
triangle.forEach((oklch) => {
const [x, y] = LCtoXY(oklch);
context.lineTo(x, y);
});
context.closePath();
context.strokeStyle = color;
context.stroke();
}
function drawLCPoint(
context,
okLC,
radius = width * 0.01,
color = "white",
fill = true
) {
context.beginPath();
context.arc(...LCtoXY(okLC), radius, 0, Math.PI * 2);
if (fill) {
context.fillStyle = color;
context.fill();
} else {
context.strokeStyle = color;
context.stroke();
}
}
};
canvasSketch(sketch, settings);