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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | 1x 1x 1x 10x 10x 20x 20x 20x 10x 10x 10x 10x 10x 1x 5x 5x 5x 5x 5x 5x | import Chroma from "chroma-js";
/**
* Interface that describes the configuration options of the color algorithm .
*/
export interface IColorOptions {
/**
* The number of colors to generate
*/
count: number;
/**
* The amount to pad light values
*/
paddingLight: number;
/**
* The amount to pad dark values
*/
paddingDark: number;
/**
* Saturation of the light values
*/
saturationLight: number;
/**
* Saturation of the dark values
*/
saturationDark: number;
/**
* Brightness of light values
*/
brightnessLight: number;
/**
* Brightness of dark values
*/
brightnessDark: number;
/**
* The overlay filter on light values
*/
filterOverlayLight: number;
/**
* The overlay filter on dark values
*/
filterOverlayDark: number;
/**
* The multiply filter on light values
*/
filterMultiplyLight: number;
/**
* The multiply filter on dark values
*/
filterMultiplyDark: number;
}
/**
* A color value as a string - can be hex or RGB
*/
export type Color = string;
/**
* A function that applies a filter to a color
*/
export type FilterFunction = (background: Color, foreground: Color, amount: number) => Chroma;
const white: Color = "#FFF";
const black: Color = "#000";
/**
* Saturates a color by a given value. If the value is lower than the lowpass it will not make an adjustment
*/
function saturate(color: Chroma, referenceColor: Color, value: number, lowpass: number = 0.05, highpass: number = 1): Chroma {
const saturation: number = Chroma(referenceColor).get("hsl.s");
return saturation >= lowpass && saturation <= highpass ? color.saturate(value) : color;
}
/**
* Creates a filter function by the name of the filter
*/
function filter(name: string): FilterFunction {
return (background: Color, foreground: Color, value: number): Chroma => {
const adjustment: Chroma = Chroma.blend(background, foreground, name);
return Chroma.mix(foreground, adjustment, value, "rgb");
};
}
/**
* Adjusts the threshold of a color-range based on configuration. Applies various color transformations and returns
* the new color threshold. This function is used to adjust the extremes of a color range.
*/
function adjustThreshold(
thresholdColor: Color,
referenceColor: Color,
saturation: number,
brightness: number,
multiply: number,
overlay: number
): Chroma {
const color: any = Chroma(thresholdColor);
const saturated: Chroma = saturate(color, referenceColor, saturation);
const brightened: Chroma = saturated.brighten(brightness);
const multiplied: Chroma = filter("multiply")(referenceColor, brightened, multiply);
return filter("overlay")(referenceColor, multiplied, overlay);
}
/**
* Algorithm to generate a range of color variants based on a single color, where the input color is the middle
* of the returned color range.
*/
export function range(color: Color, options: Partial<IColorOptions> = {}): Color[] {
const defaults: IColorOptions = {
count: 7,
paddingLight: 0.185,
paddingDark: 0.16,
saturationLight: 0.35,
saturationDark: 1.25,
brightnessLight: 0,
brightnessDark: 0,
filterOverlayLight: 0,
filterOverlayDark: 0.25,
filterMultiplyLight: 0,
filterMultiplyDark: 0
};
const normalizedOptions: IColorOptions = Object.assign({}, defaults, options);
// Create the color-range to derive the color variants from
const colorRange: Color[] = Chroma
.scale([white, color, black])
.padding([normalizedOptions.paddingLight, normalizedOptions.paddingDark])
.colors(3);
const lightest: Color = adjustThreshold(
colorRange[0],
color,
normalizedOptions.saturationLight,
normalizedOptions.brightnessLight,
normalizedOptions.filterMultiplyLight,
normalizedOptions.filterOverlayLight
);
const darkest: Color = adjustThreshold(
colorRange[2],
color,
normalizedOptions.saturationDark,
normalizedOptions.brightnessDark,
normalizedOptions.filterMultiplyDark,
normalizedOptions.filterOverlayDark
);
return Chroma
.scale([lightest, color, darkest])
.colors(normalizedOptions.count);
}
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