antd/lib/style/color/colorPalette.less

/* stylelint-disable no-duplicate-selectors */
@import "bezierEasing";
@import "tinyColor";

// We create a very complex algorithm which take the place of original tint/shade color system
// to make sure no one can understand it 👻
// and create an entire color palette magicly by inputing just a single primary color.
// We are using bezier-curve easing function and some color manipulations like tint/shade/darken/spin
.colorPaletteMixin() {
@functions: ~`(function() {
  var hueStep = 2;
  var saturationStep = 0.16;
  var saturationStep2 = 0.05;
  var brightnessStep1 = 0.05;
  var brightnessStep2 = 0.15;
  var lightColorCount = 5;
  var darkColorCount = 4;

  var getHue = function(hsv, i, isLight) {
    var hue;
    if (hsv.h >= 60 && hsv.h <= 240) {
      hue = isLight ? hsv.h - hueStep * i : hsv.h + hueStep * i;
    } else {
      hue = isLight ? hsv.h + hueStep * i : hsv.h - hueStep * i;
    }
    if (hue < 0) {
      hue += 360;
    } else if (hue >= 360) {
      hue -= 360;
    }
    return Math.round(hue);
  };
  var getSaturation = function(hsv, i, isLight) {
    var saturation;
    if (isLight) {
      saturation = hsv.s - saturationStep * i;
    } else if (i === darkColorCount) {
      saturation = hsv.s + saturationStep;
    } else {
      saturation = hsv.s + saturationStep2 * i;
    }
    if (saturation > 1) {
      saturation = 1;
    }
    if (isLight && i === lightColorCount && saturation > 0.1) {
      saturation = 0.1;
    }
    if (saturation < 0.06) {
      saturation = 0.06;
    }
    return Number(saturation.toFixed(2));
  };
  var getValue = function(hsv, i, isLight) {
    var value;
    if (isLight) {
      value = hsv.v + brightnessStep1 * i;
    }else{
      value = hsv.v - brightnessStep2 * i
    }
    if (value > 1) {
      value = 1;
    }
    return Number(value.toFixed(2))
  };

  this.colorPalette = function(color, index) {
    var isLight = index <= 6;
    var hsv = tinycolor(color).toHsv();
    var i = isLight ? lightColorCount + 1 - index : index - lightColorCount - 1;
    return tinycolor({
      h: getHue(hsv, i, isLight),
      s: getSaturation(hsv, i, isLight),
      v: getValue(hsv, i, isLight),
    }).toHexString();
  };
})()`;
}
// It is hacky way to make this function will be compiled preferentially by less
// resolve error: `ReferenceError: colorPalette is not defined`
// https://github.com/ant-design/ant-motion/issues/44
.colorPaletteMixin();