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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,81 @@ | ||
| import 'dart:math'; | ||
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| import 'package:flutter/material.dart'; | ||
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| // Based upon: https://stackoverflow.com/questions/64639589/how-to-adjust-hue-saturation-and-brightness-of-an-image-in-flutter | ||
| // from BananaNeil: https://stackoverflow.com/users/937841/banananeil. | ||
| // This is, in turn, based upon: https://stackoverflow.com/a/7917978/937841 | ||
|
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| /// Use the [ChangeColors] widget to change the brightness and hue of any widget, including images. | ||
| /// | ||
| /// Example: | ||
| /// | ||
| /// ``` | ||
| /// ChangeColors( | ||
| /// hue: 0.55, | ||
| /// brightness: 0.2, | ||
| /// child: Image.asset('myImage.png'), | ||
| /// ); | ||
| /// ``` | ||
| /// | ||
| /// To achieve a greyscale effect, you may also use the | ||
| /// [ChangeColors.greyscale] constructor. | ||
| /// | ||
| class ChangeColors extends StatelessWidget { | ||
| const ChangeColors({this.brightness = 0.0, this.hue = 0.0, required this.child, super.key}); | ||
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| /// Negative value will make it darker (-1 is darkest). | ||
| /// Positive value will make it lighter (1 is the maximum, but you can go above it). | ||
| /// Note: 0.0 is unchanged. | ||
| final double brightness; | ||
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| /// From -1.0 to 1.0 (Note: 1.0 wraps into -1.0, such as 1.2 is the same as -0.8). | ||
| /// Note: 0.0 is unchanged. Adding or subtracting multiples of 2.0 also keeps it unchanged. | ||
| final double hue; | ||
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| final Widget child; | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return ColorFiltered( | ||
| colorFilter: ColorFilter.matrix(_adjustMatrix(hue: hue * pi, brightness: brightness)), | ||
| child: child, | ||
| ); | ||
| } | ||
| } | ||
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| List<double> _adjustMatrix({required double hue, required double brightness}) { | ||
| if (hue == 0 && brightness == 0) { | ||
| // dart format off | ||
| return [ | ||
| 1, 0, 0, 0, 0, | ||
| 0, 1, 0, 0, 0, | ||
| 0, 0, 1, 0, 0, | ||
| 0, 0, 0, 1, 0, | ||
| ]; | ||
| // dart format on | ||
| } | ||
| final brightnessValue = brightness <= 0 ? brightness * 255 : brightness * 100; | ||
| return List<double>.from(<double>[ | ||
| 0.213 + cos(hue) * 0.787 + sin(hue) * -0.213, | ||
| 0.715 + cos(hue) * -0.715 + sin(hue) * -0.715, | ||
| 0.072 + cos(hue) * -0.072 + sin(hue) * 0.928, | ||
| 0, | ||
| brightnessValue, | ||
| 0.213 + cos(hue) * -0.213 + sin(hue) * 0.143, | ||
| 0.715 + cos(hue) * 0.285 + sin(hue) * 0.140, | ||
| 0.072 + cos(hue) * -0.072 + sin(hue) * -0.283, | ||
| 0, | ||
| brightnessValue, | ||
| 0.213 + cos(hue) * -0.213 + sin(hue) * -0.787, | ||
| 0.715 + cos(hue) * -0.715 + sin(hue) * 0.715, | ||
| 0.072 + cos(hue) * 0.928 + sin(hue) * 0.072, | ||
| 0, | ||
| brightnessValue, | ||
| 0, | ||
| 0, | ||
| 0, | ||
| 1, | ||
| 0, | ||
| ]).map((i) => i).toList(); | ||
| } |