@antv/f2/es/deps/d3-interpolate/src/rgb.js

Charts for mobile visualization.

import { rgb as colorRgb } from '../../d3-color/src';
import basis from './basis.js';
import basisClosed from './basisClosed.js';
import nogamma, { gamma } from './color.js';
export default (function rgbGamma(y) {
  var color = gamma(y);
  function rgb(start, end) {
    var r = color((start = colorRgb(start)).r, (end = colorRgb(end)).r),
      g = color(start.g, end.g),
      b = color(start.b, end.b),
      opacity = nogamma(start.opacity, end.opacity);
    return function (t) {
      start.r = r(t);
      start.g = g(t);
      start.b = b(t);
      start.opacity = opacity(t);
      return start + '';
    };
  }
  rgb.gamma = rgbGamma;
  return rgb;
})(1);
function rgbSpline(spline) {
  return function (colors) {
    var n = colors.length,
      r = new Array(n),
      g = new Array(n),
      b = new Array(n),
      i,
      color;
    for (i = 0; i < n; ++i) {
      color = colorRgb(colors[i]);
      r[i] = color.r || 0;
      g[i] = color.g || 0;
      b[i] = color.b || 0;
    }
    r = spline(r);
    g = spline(g);
    b = spline(b);
    color.opacity = 1;
    return function (t) {
      color.r = r(t);
      color.g = g(t);
      color.b = b(t);
      return color + '';
    };
  };
}
export var rgbBasis = rgbSpline(basis);
export var rgbBasisClosed = rgbSpline(basisClosed);