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[Harmony]颜色初始化

news 来源：原创 2025/6/6 17:47:09

默认初始化颜色

let color: Color = 0xFF00FF

创建一个工具，用十六进制颜色和RGBA初始化颜色


// 颜色工具类
export class ColorUtils {/*** 十六进制颜色初始化（支持透明度）* @param hex 支持格式：#RRGGBB、#AARRGGBB、0xRRGGBB、0xAARRGGBB* @param alpha 可选透明度（0-1）*/static fromHex(hex: string | number, alpha?: number): Color {let hexValue: number;if (typeof hex === 'string') {// 去除#号hex = hex.replace('#', '');// 处理3/4位简写格式if (hex.length === 3 || hex.length === 4) {hex = hex.split('').map(c => c + c).join('');}// 补全6位或8位if (hex.length === 6) {hex = 'FF' + hex; // 默认不透明}hexValue = parseInt(hex, 16);} else {hexValue = hex;}// 应用透明度覆盖if (alpha !== undefined) {const alphaByte = Math.round(alpha * 255);hexValue = (alphaByte << 24) | (hexValue & 0x00FFFFFF);}return hexValue as Color;}/*** RGBA颜色初始化* @param r 红色通道（0-255）* @param g 绿色通道（0-255）* @param b 蓝色通道（0-255）* @param a 透明度（0-1）*/static fromRGBA(r: number, g: number, b: number, a: number = 1): Color {const alphaByte = Math.round(a * 255);return ((alphaByte << 24) | (r << 16) | (g << 8) | b) as Color;}/*** 将Color转换为十六进制字符串* @param color 颜色对象* @param withAlpha 是否包含透明度通道* @returns 格式：#AARRGGBB 或 #RRGGBB*/static toHexString(color: Color, withAlpha: boolean = true): string {const num = Number(color);if (withAlpha) {return `#${((num >>> 0) & 0xFFFFFFFF).toString(16).padStart(8, '0').toUpperCase()}`;}return `#${((num & 0x00FFFFFF) >>> 0).toString(16).padStart(6, '0').toUpperCase()}`;}/*** 将Color转换为RGBA对象* @param color 颜色对象* @returns 包含r,g,b,a(0-1)的对象*/static toRGBA(color: Color): RGBAColor {const num = Number(color);return {r: (num >> 16) & 0xFF,g: (num >> 8) & 0xFF,b: num & 0xFF,a: ((num >> 24) & 0xFF) / 255};}
}interface RGBAColor {r: number;g: number;b: number;a: number;
}