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35 lines
1.4 KiB
35 lines
1.4 KiB
2 years ago
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import 'package:flutter/material.dart';
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MaterialColor getSwatch(Color color) {
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final hslColor = HSLColor.fromColor(color);
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final lightness = hslColor.lightness;
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/// if [500] is the default color, there are at LEAST five
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/// steps below [500]. (i.e. 400, 300, 200, 100, 50.) A
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/// divisor of 5 would mean [50] is a lightness of 1.0 or
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/// a color of #ffffff. A value of six would be near white
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/// but not quite.
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const lowDivisor = 6;
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/// if [500] is the default color, there are at LEAST four
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/// steps above [500]. A divisor of 4 would mean [900] is
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/// a lightness of 0.0 or color of #000000
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const highDivisor = 5;
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final lowStep = (1.0 - lightness) / lowDivisor;
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final highStep = lightness / highDivisor;
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return MaterialColor(color.value, {
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50: (hslColor.withLightness(lightness + (lowStep * 5))).toColor(),
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100: (hslColor.withLightness(lightness + (lowStep * 4))).toColor(),
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200: (hslColor.withLightness(lightness + (lowStep * 3))).toColor(),
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300: (hslColor.withLightness(lightness + (lowStep * 2))).toColor(),
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400: (hslColor.withLightness(lightness + lowStep)).toColor(),
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500: (hslColor.withLightness(lightness)).toColor(),
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600: (hslColor.withLightness(lightness - highStep)).toColor(),
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700: (hslColor.withLightness(lightness - (highStep * 2))).toColor(),
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800: (hslColor.withLightness(lightness - (highStep * 3))).toColor(),
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900: (hslColor.withLightness(lightness - (highStep * 4))).toColor(),
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});
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}
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