72 wiersze
1.9 KiB
TypeScript
72 wiersze
1.9 KiB
TypeScript
import { Random } from "./random";
|
|
import { range } from "./util";
|
|
import * as colorspaces from "colorspaces";
|
|
|
|
/**
|
|
* Clamp the given number to be between 0 and 255, then
|
|
* convert it to hexadecimal.
|
|
*/
|
|
export function clampedByteToHex(value: number): string {
|
|
if (value < 0) {
|
|
value = 0;
|
|
} else if (value > 255) {
|
|
value = 255;
|
|
}
|
|
let hex = value.toString(16);
|
|
if (hex.length === 1) {
|
|
hex = "0" + hex;
|
|
}
|
|
return hex;
|
|
}
|
|
|
|
function createRandomColor(rng: Random): string {
|
|
const max_luv_samples = 100;
|
|
let luv_sample_failed = true;
|
|
let rand_color_hex: string = "#000000";
|
|
|
|
//See if we can pull out a sample inside the LUV solid
|
|
for (let i = 0; i < max_luv_samples; i++) {
|
|
let L = rng.inRange({ min: 0, max: 100, step: 1 });
|
|
let u = rng.inRange({ min: -128, max: 128, step: 1 });
|
|
let v = rng.inRange({ min: -128, max: 128, step: 1 });
|
|
let rand_color = colorspaces.make_color("CIELUV", [L, u, v]);
|
|
|
|
if (rand_color.is_displayable()) {
|
|
rand_color_hex = rand_color.as("hex");
|
|
luv_sample_failed = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
//just sample sRGB if I couldn't sample a random LUV color
|
|
if (luv_sample_failed) {
|
|
console.log("Sampling sRGB");
|
|
let rgb = new Array<number>(3).map(() =>
|
|
rng.inRange({ min: 0, max: 255, step: 1 })
|
|
);
|
|
console.log(rgb);
|
|
for (let i = 0; i < rgb.length; i++) {
|
|
rgb[i] = rgb[i] / 255.0;
|
|
}
|
|
console.log(rgb);
|
|
let rand_color = colorspaces.make_color("sRGB", rgb);
|
|
rand_color_hex = rand_color.as("hex");
|
|
}
|
|
|
|
return rand_color_hex;
|
|
}
|
|
|
|
/**
|
|
* Create a random color palette with the given number of
|
|
* entries, optionally using the given random number generator.
|
|
*
|
|
* The return value is an Array of strings, where each string is
|
|
* a color hex hash (e.g. `#ff0000`).
|
|
*/
|
|
export function createRandomColorPalette(
|
|
numEntries: number,
|
|
rng: Random = new Random()
|
|
): string[] {
|
|
return range(numEntries).map(() => createRandomColor(rng));
|
|
}
|