From d61a6d0f3a45addea3a6653c223a46828e59031c Mon Sep 17 00:00:00 2001
From: ilyaChuk <86570508+ilyaChuk@users.noreply.github.com>
Date: Thu, 29 Feb 2024 12:37:06 +0300
Subject: [PATCH] first commit

---
 .gitignore |  1 +
 index.js   | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 index.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0dc7b4b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/.vscode
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..8c07f09
--- /dev/null
+++ b/index.js
@@ -0,0 +1,89 @@
+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);
\ No newline at end of file