[英]WPF 3-Point Gradient
Using C# how can I generate a gradient with 3 points: 使用C#如何生成3个点的渐变:
The way I'm doing it now is overlaying 2 gradients. 我现在的操作方式是覆盖2个渐变。
I'd like to simplify it into 1 gradient if possible. 如果可能的话,我想将其简化为1个渐变。
C# C#
// White to Blue
LinearGradientBrush WhiteBlue = new LinearGradientBrush();
WhiteBlue.StartPoint = new System.Windows.Point(0, 0);
WhiteBlue.EndPoint = new System.Windows.Point(1, 0);
WhiteBlue.GradientStops.Add(new GradientStop(Color.FromArgb(255, 255, 255, 255), 0)); // white
WhiteBlue.GradientStops.Add(new GradientStop(Color.FromArgb(255, 255, 0, 0), 1)); // blue
rectangle1.Fill = WhiteBlue;
// Transparent to Black
LinearGradientBrush Black = new LinearGradientBrush();
Black.StartPoint = new System.Windows.Point(0, 0);
Black.EndPoint = new System.Windows.Point(0, 1);
Black.GradientStops.Add(new GradientStop(Color.FromArgb(0, 0, 0, 0), 0)); // transparent
Black.GradientStops.Add(new GradientStop(Color.FromArgb(255, 0, 0, 0), 1)); // black
rectangle2.Fill = Black;
XAML XAML
<Rectangle x:Name="rectangle1"
HorizontalAlignment="Left"
Width="255"
Height="255"
VerticalAlignment="Top">
</Rectangle>
<Rectangle x:Name="rectangle2"
HorizontalAlignment="Left"
Width="255"
Height="255"
VerticalAlignment="Top">
</Rectangle>
You can come quite close with a opacity mask combined with a linear gradient brush, but its not perfect. 您可以使用不透明蒙版与线性渐变画笔相结合,但效果并不理想。
<Rectangle>
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" >
<GradientStop Color="Blue" Offset="0"/>
<GradientStop Color="Black" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.OpacityMask>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="Transparent" Offset="0"/>
<GradientStop Color="Black" Offset="0.5"/>
</LinearGradientBrush>
</Rectangle.OpacityMask>
</Rectangle>
Simply put, you can not define a two-dimensional gradient . 简而言之, 您无法定义二维渐变 。
The simplest technique is the one you are using: perform an overlay with 2 linear gradients. 最简单的技术是您正在使用的一种技术:使用2个线性渐变执行叠加。
Using an opacity mask, as Fredrik's answer suggests, is equally valid, but it all comes down to combining gradients: WPF does not allow (still) defining a 2D gradient. 正如Fredrik的答案所暗示的那样,使用不透明蒙版同样有效,但是所有这些都归结为组合渐变:WPF不允许(仍然)定义2D渐变。
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