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ilyaChuk committed Feb 29, 2024
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1 change: 1 addition & 0 deletions .gitignore
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/.vscode
89 changes: 89 additions & 0 deletions index.js
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class SeedRandom {
constructor(seed) {
this.seed = seed;
}

random(x, y) {
var hash = (x + y * 57) * 57 + this.seed;
hash = Math.sin(hash) * 10000;
return hash - Math.floor(hash);
}
}

class GradientSquares {
static get inputProperties() {
return ['--gradient-start', '--gradient-end', '--gradient-angle', '--square-size', '--noise-intensity', '--seed'];
}

paint(ctx, size, properties) {
const startColor = properties.get('--gradient-start').toString().trim();
const endColor = properties.get('--gradient-end').toString().trim();
let angle = parseFloat(properties.get('--gradient-angle').toString()) || 0;
let squareSize = parseInt(properties.get('--square-size').toString()) || 5;
const noiseIntensity = parseFloat(properties.get('--noise-intensity').toString()) || 25;
const seed = parseInt(properties.get('--seed').toString()) || 12345;

// Коррекция угла
angle = angle % 360;
if (angle < 0) angle += 360; // Нормализация отрицательного угла
squareSize = Math.max(1, squareSize);

const seedRandom = new SeedRandom(seed);
const startRGB = this.hexToRgb(startColor);
const endRGB = this.hexToRgb(endColor);

const width = size.width;
const height = size.height;

// Преобразование угла в радианы для расчетов
const angleRad = (angle * Math.PI) / 180;

for (let y = 0; y < height; y += squareSize) {
for (let x = 0; x < width; x += squareSize) {
// Учет угла для определения позиции квадрата в градиенте
const dx = x - width / 2;
const dy = y - height / 2;
const distance = dx * Math.cos(angleRad) + dy * Math.sin(angleRad);
const maxDistance = Math.sqrt((width / 2) ** 2 + (height / 2) ** 2);
const ratio = (distance + maxDistance) / (2 * maxDistance);

const noise = (seedRandom.random(x / squareSize, y / squareSize) * 2 - 1) * noiseIntensity;

const color = this.applyNoiseToColor(startRGB, endRGB, ratio, noise);

ctx.fillStyle = `rgb(${color.r}, ${color.g}, ${color.b})`;
ctx.fillRect(x, y, squareSize, squareSize);
}
}
}

applyNoiseToColor(startRGB, endRGB, ratio, noise) {
let r = startRGB.r + ratio * (endRGB.r - startRGB.r);
let g = startRGB.g + ratio * (endRGB.g - startRGB.g);
let b = startRGB.b + ratio * (endRGB.b - startRGB.b);

// Применяем шум, убедившись, что значения остаются в диапазоне [0, 255]
r = Math.max(0, Math.min(255, r + noise));
g = Math.max(0, Math.min(255, g + noise));
b = Math.max(0, Math.min(255, b + noise));

return { r: Math.round(r), g: Math.round(g), b: Math.round(b) };
}

hexToRgb(hex) {
let r = 0, g = 0, b = 0;
hex = hex.replace(/^#/, '');
if (hex.length === 3) {
r = parseInt(hex[0] + hex[0], 16);
g = parseInt(hex[1] + hex[1], 16);
b = parseInt(hex[2] + hex[2], 16);
} else if (hex.length === 6) {
r = parseInt(hex.slice(0, 2), 16);
g = parseInt(hex.slice(2, 4), 16);
b = parseInt(hex.slice(4, 6), 16);
}
return { r, g, b };
}
}

registerPaint('gradientSquares', GradientSquares);

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