imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
37 lines (36 loc) • 1.93 kB
JavaScript
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.rainbow = void 0;
const math_1 = require("../../../constants/math");
const global = (_a) => __awaiter(void 0, [_a], void 0, function* ({ data, width, height }) {
const rPhase = (0, math_1.random)() * 2 * math_1.PI;
const gPhase = (0, math_1.random)() * 2 * math_1.PI;
const bPhase = (0, math_1.random)() * 2 * math_1.PI;
for (let i = 0; i < data.length; i += 4) {
const x = (i / 4) % width;
const y = (0, math_1.floor)((i / 4) / width);
const grayscale = data[i];
const rWave = grayscale * (0.75 + 0.25 * (0, math_1.sin)(2 * math_1.PI * (x / width) + rPhase));
const gWave = grayscale * (0.75 + 0.25 * (0, math_1.sin)(2 * math_1.PI * (y / height) + gPhase));
const bWwave = grayscale * (0.75 + 0.25 * (0, math_1.sin)(2 * math_1.PI * ((x / width + y / height) + bPhase)));
data[i] = (0, math_1.pow)(rWave / 255, 0.75) * 255;
data[i + 1] = (0, math_1.pow)(gWave / 255, 0.75) * 255;
data[i + 2] = (0, math_1.pow)(bWwave / 255, 0.75) * 255;
}
return data;
});
const rainbow = {
name: 'rainbow',
browser: global,
node: global
};
exports.rainbow = rainbow;