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added ColorUtils.lerp(List<Color> colors, double t) function #77

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added ColorUtils.lerp(List<Color> colors, double t) function #77

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16 changes: 16 additions & 0 deletions lib/src/ColorUtils.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,22 @@ class ColorUtils {
static const String BASIC_COLOR_BLUE = 'blue';
static const String HEX_BLACK = '#000000';
static const String HEX_WHITE = '#FFFFFF';

///
/// Lerps multiple colors according to [t]
///
/// Similar to Color.lerp, but with support for more than two colors instead
///
static Color lerp(List<Color> colors, double t) {
final double newT = math.min(1.0, math.max(0.0, t));
if (newT == 1.0) {
return colors.last;
}
final double x = newT * (colors.length - 1);
final Color oldColor = colors[x.floor()];
final Color newColor = colors[(x + 1).floor()];
return Color.lerp(oldColor, newColor, x - x.floor())!;
}

///
/// Converts the given [hex] color string to the corresponding int.
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