| 799 | |
| 800 | // 将十六进制颜色转换为rgba格式 |
| 801 | function hexToRgba(hex, alpha) { |
| 802 | // 移除井号 |
| 803 | hex = hex.replace('#', ''); |
| 804 | |
| 805 | // 解析RGB值 |
| 806 | const r = parseInt(hex.length === 3 ? hex.substring(0, 1).repeat(2) : hex.substring(0, 2), 16); |
| 807 | const g = parseInt(hex.length === 3 ? hex.substring(1, 2).repeat(2) : hex.substring(2, 4), 16); |
| 808 | const b = parseInt(hex.length === 3 ? hex.substring(2, 3).repeat(2) : hex.substring(4, 6), 16); |
| 809 | |
| 810 | // 返回rgba字符串 |
| 811 | return `rgba(${r}, ${g}, ${b}, ${alpha})`; |
| 812 | } |
| 813 | |
| 814 | // 渲染热力图（自定义实现） |
| 815 | function renderHeatmap(ctx, data, options) { |