113 lines
3.1 KiB
TypeScript
113 lines
3.1 KiB
TypeScript
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/**
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* 颜色处理工具类
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* 提供十进制颜色值转十六进制颜色码（支持BGR转RGB）及文字对比度计算功能
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*/
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function decimalToHexColor(decimal: number | string): string {
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// 处理空值和非数字情况
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if (decimal === undefined || decimal === null || decimal === '') {
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return '#FFFFFF';
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}
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// 统一转换为数字类型
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const num = typeof decimal === 'string' ? parseFloat(decimal) : decimal;
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if (isNaN(num)) {
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return '#FFFFFF';
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}
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// 十进制转十六进制并转为大写
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let hex = Math.floor(num).toString(16).toUpperCase();
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let rgbHex = ''
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// 确保十六进制字符串为6位，不足则补0
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if (hex.length < 6) {
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hex = hex.padStart(6, '0');
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}
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// BGR转RGB（交换前后两位）
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const r = hex.substring(4, 6);
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const g = hex.substring(2, 4);
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const b = hex.substring(0, 2);
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rgbHex = r + g + b;
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return `#${rgbHex}`;
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}
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// 处理颜色转换为十进制数字
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const convertHexToNumber = (hex: string) => {
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if (!hex) return
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hex = hex.replace('#', '');
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const bgr = hex.slice(4, 6) + hex.slice(2, 4) + hex.slice(0, 2);
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return parseInt(bgr, 16);
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};
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/**
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* 根据背景色计算对比度文字颜色（黑/白）
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* @param bgColor 十六进制背景色（如#FFFF80）
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* @returns 对比度文字颜色（#333333或#FFFFFF）
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*/
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function getContrastTextColor(bgColor: string): string {
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// 验证颜色格式
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if (!/^#([0-9A-F]{6})$/i.test(bgColor)) {
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throw new Error('Invalid hex color format. Expected #RRGGBB');
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}
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// 提取RGB分量
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const r = parseInt(bgColor.slice(1, 3), 16);
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const g = parseInt(bgColor.slice(3, 5), 16);
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const b = parseInt(bgColor.slice(5, 7), 16);
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// 计算亮度（标准 luminance 公式）
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const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
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// 根据亮度返回对比色
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return luminance > 0.5 ? '#333333' : '#FFFFFF';
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}
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// 打印https pdf
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function printPDF(pdfUrl: string) {
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// 验证URL是否为HTTPS
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if (pdfUrl.startsWith('http')) {
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console.warn('PDF URL不是HTTPS协议，可能存在安全风险');
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}
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const iframe = document.createElement('iframe');
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iframe.style.display = 'none';
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iframe.src = pdfUrl;
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document.body.appendChild(iframe);
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iframe.onload = () => {
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iframe.contentWindow?.print();
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setTimeout(() => URL.revokeObjectURL(pdfUrl), 1000); // 释放内存
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};
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}
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// 打印base64 pdf
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function printBase64PDF(base64: string) {
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const blob = base64ToBlob(base64);
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const pdfUrl = URL.createObjectURL(blob);
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const iframe = document.createElement('iframe');
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iframe.style.display = 'none';
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iframe.src = pdfUrl;
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document.body.appendChild(iframe);
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iframe.onload = () => {
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iframe.contentWindow?.print();
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setTimeout(() => URL.revokeObjectURL(pdfUrl), 1000); // 释放内存
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};
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}
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function base64ToBlob(base64: string) {
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const binaryString = atob(base64.replace(/[\n\r]/g, ''));
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const bytes = new Uint8Array(binaryString.length);
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for (let i = 0; i < binaryString.length; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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return new Blob([bytes], { type: 'application/pdf' });
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}
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export const classCom = { decimalToHexColor, convertHexToNumber, getContrastTextColor, printBase64PDF, printPDF }
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