interpolateColor method

@override void interpolateColor(Mobject _mob1, Mobject _mob2, double alpha)

Implementation

@override
void interpolateColor(Mobject _mob1, Mobject _mob2, double alpha) {
  assert(_mob1 is VMobject && _mob2 is Mobject);
  var mob1 = _mob1 as VMobject;
  var mob2 = _mob2 as VMobject;

  fillColors =
      interpolateColorList(mob1.getFillColors(), mob2.getFillColors(), alpha);
  strokeColors = interpolateColorList(
      mob1.getStrokeColors(), mob2.getStrokeColors(), alpha);
  backgroundStrokeColors = interpolateColorList(
      mob1.getStrokeColors(background: true),
      mob2.getStrokeColors(background: true),
      alpha);
  strokeWidth = interpolateValue(mob1.strokeWidth, mob2.strokeWidth, alpha);
  backgroundStrokeWidth = interpolateValue(
      mob1.backgroundStrokeWidth, mob2.backgroundStrokeWidth, alpha);

  var copyColors = (List<Color> colors) => [...colors.map((c) => c.copy())];

  if (alpha == 1.0) {
    fillColors =
        mob2.fillColors != null ? copyColors(mob2.fillColors!) : null;
    strokeColors =
        mob2.strokeColors != null ? copyColors(mob2.strokeColors!) : null;
    backgroundStrokeColors = mob2.backgroundStrokeColors != null
        ? copyColors(mob2.backgroundStrokeColors!)
        : null;
    strokeWidth = mob2.strokeWidth;
    backgroundStrokeWidth = mob2.backgroundStrokeWidth;
  }
}