Created
November 8, 2017 11:18
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| function getContrastColor (color) { | |
| const [RED, GREEN, BLUE] = [0, 1, 2] | |
| const fraction = (val, pos) => parseInt(val.slice(pos * 2, pos * 2 + 2), 16) | |
| const contrast = (fraction(color, RED) * 299 + fraction(color, GREEN) * 587 + fraction(color, BLUE) * 114) / 1000 | |
| if (contrast > 180) { | |
| return 'rgba(0, 0, 0, 0.8)' | |
| } else { | |
| return 'rgba(255, 255, 255, 0.8)' | |
| } | |
| } |
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