Flutter 如何在Flatter中创建颜色矩阵?
我希望使用ColorFiltered小部件应用颜色饱和度矩阵,但不知道如何制作矩阵。在我的例子中,我用以下方法解决了这个问题:Flutter 如何在Flatter中创建颜色矩阵?,flutter,Flutter,我希望使用ColorFiltered小部件应用颜色饱和度矩阵,但不知道如何制作矩阵。在我的例子中,我用以下方法解决了这个问题: class CustomSubFilters extends ColorFilter { CustomSubFilters.matrix(List<double> matrix) : super.matrix(matrix); ///defaults to unity matrix when s = 0; factory CustomSubFi
class CustomSubFilters extends ColorFilter {
CustomSubFilters.matrix(List<double> matrix) : super.matrix(matrix);
///defaults to unity matrix when s = 0;
factory CustomSubFilters.saturate(double sat) {
num x = 1 + sat;
num lumR = 0.3086;
num lumG = 0.6094;
num lumB = 0.0820;
return CustomSubFilters.matrix(<double>[
lumR * (1 - x) + x,
lumG * (1 - x),
lumB * (1 - x),
0,
0,
lumR * (1 - x),
lumG * (1 - x) + x,
lumB * (1 - x),
0,
0,
lumR * (1 - x),
lumG * (1 - x),
lumB * (1 - x) + x,
0,
0,
0,
0,
0,
1,
0,
]);
class CustomSubFilter扩展了ColorFilter{
CustomSubFilters.matrix(列表矩阵):super.matrix(矩阵);
///s=0时默认为单位矩阵;
工厂定制副过滤器。饱和(双饱和){
numx=1+sat;
num lumR=0.3086;
num lumG=0.6094;
num lumB=0.0820;
返回CustomSubFilters.matrix([
lumR*(1-x)+x,
lumG*(1-x),
lumB*(1-x),
0,
0,
lumR*(1-x),
lumG*(1-x)+x,
lumB*(1-x),
0,
0,
lumR*(1-x),
lumG*(1-x),
lumB*(1-x)+x,
0,
0,
0,
0,
0,
1.
0,
]);
}
当然,您的实现非常灵活,只是不要忘记扩展ColorFilter类。在我的例子中,我用以下方法解决了它:
class CustomSubFilters extends ColorFilter {
CustomSubFilters.matrix(List<double> matrix) : super.matrix(matrix);
///defaults to unity matrix when s = 0;
factory CustomSubFilters.saturate(double sat) {
num x = 1 + sat;
num lumR = 0.3086;
num lumG = 0.6094;
num lumB = 0.0820;
return CustomSubFilters.matrix(<double>[
lumR * (1 - x) + x,
lumG * (1 - x),
lumB * (1 - x),
0,
0,
lumR * (1 - x),
lumG * (1 - x) + x,
lumB * (1 - x),
0,
0,
lumR * (1 - x),
lumG * (1 - x),
lumB * (1 - x) + x,
0,
0,
0,
0,
0,
1,
0,
]);
class CustomSubFilter扩展了ColorFilter{
CustomSubFilters.matrix(列表矩阵):super.matrix(矩阵);
///s=0时默认为单位矩阵;
工厂定制副过滤器。饱和(双饱和){
numx=1+sat;
num lumR=0.3086;
num lumG=0.6094;
num lumB=0.0820;
返回CustomSubFilters.matrix([
lumR*(1-x)+x,
lumG*(1-x),
lumB*(1-x),
0,
0,
lumR*(1-x),
lumG*(1-x)+x,
lumB*(1-x),
0,
0,
lumR*(1-x),
lumG*(1-x),
lumB*(1-x)+x,
0,
0,
0,
0,
0,
1.
0,
]);
}
当然,您的实现是灵活的,只是不要忘记扩展ColorFilter类