摘要：XAML<；GradientStopColor=“Red”偏移=“0.25”/>；myLinearGradientBrush.StartPoint=newPoint（0；//使用画笔绘制矩形。对角线填充矩形。填充=myLinearGradientBrush；
本示例演示如何使用 LinearGradientBrush 类来绘制带有线性渐变的区域。在下面的示例中，Rectangle 的Fill 是用从黄色依次过渡到红色、蓝色和浅绿色的对角线性渐变来绘制的。
<!-- This rectangle is painted with a diagonal linear gradient. --> <Rectangle Width="200" Height="100"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="1,1"> <GradientStop Color="Yellow" Offset="0.0" /> <GradientStop Color="Red" Offset="0.25" /> <GradientStop Color="Blue" Offset="0.75" /> <GradientStop Color="LimeGreen" Offset="1.0" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>
Rectangle diagonalFillRectangle = new Rectangle(); diagonalFillRectangle.Width = 200; diagonalFillRectangle.Height = 100; // Create a diagonal linear gradient with four stops. LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush(); myLinearGradientBrush.StartPoint = new Point(0,0); myLinearGradientBrush.EndPoint = new Point(1,1); myLinearGradientBrush.GradientStops.Add( new GradientStop(Colors.Yellow, 0.0)); myLinearGradientBrush.GradientStops.Add( new GradientStop(Colors.Red, 0.25)); myLinearGradientBrush.GradientStops.Add( new GradientStop(Colors.Blue, 0.75)); myLinearGradientBrush.GradientStops.Add( new GradientStop(Colors.LimeGreen, 1.0)); // Use the brush to paint the rectangle. diagonalFillRectangle.Fill = myLinearGradientBrush;
下图显示了上一示例创建的渐变。
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若要创建水平线性渐变，请将 LinearGradientBrush 的 StartPoint 和 EndPoint 分别改为 (0,0.5) 和 (1,0.5)。在下面的示例中，Rectangle 是用水平线性渐变来绘制的。
<!-- This rectangle is painted with a horizontal linear gradient. --> <Rectangle Width="200" Height="100"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5"> <GradientStop Color="Yellow" Offset="0.0" /> <GradientStop Color="Red" Offset="0.25" /> <GradientStop Color="Blue" Offset="0.75" /> <GradientStop Color="LimeGreen" Offset="1.0" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>
Rectangle horizontalFillRectangle = new Rectangle(); horizontalFillRectangle.Width = 200; horizontalFillRectangle.Height = 100; // Create a horizontal linear gradient with four stops. LinearGradientBrush myHorizontalGradient = new LinearGradientBrush(); myHorizontalGradient.StartPoint = new Point(0,0.5); myHorizontalGradient.EndPoint = new Point(1,0.5); myHorizontalGradient.GradientStops.Add( new GradientStop(Colors.Yellow, 0.0)); myHorizontalGradient.GradientStops.Add( new GradientStop(Colors.Red, 0.25)); myHorizontalGradient.GradientStops.Add( new GradientStop(Colors.Blue, 0.75)); myHorizontalGradient.GradientStops.Add( new GradientStop(Colors.LimeGreen, 1.0)); // Use the brush to paint the rectangle. horizontalFillRectangle.Fill = myHorizontalGradient;
下图显示了上一示例创建的渐变。
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若要创建垂直线性渐变，请将 LinearGradientBrush 的 StartPoint 和 EndPoint 分别改为 (0.5,0) 和 (0.5,1)。在下面的示例中，Rectangle 是用垂直线性渐变来绘制的。
<!-- This rectangle is painted with a vertical gradient. --> <Rectangle Width="200" Height="100"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1"> <GradientStop Color="Yellow" Offset="0.0" /> <GradientStop Color="Red" Offset="0.25" /> <GradientStop Color="Blue" Offset="0.75" /> <GradientStop Color="LimeGreen" Offset="1.0" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>
Rectangle verticalFillRectangle = new Rectangle(); verticalFillRectangle.Width = 200; verticalFillRectangle.Height = 100; // Create a vertical linear gradient with four stops. LinearGradientBrush myVerticalGradient = new LinearGradientBrush(); myVerticalGradient.StartPoint = new Point(0.5,0); myVerticalGradient.EndPoint = new Point(0.5,1); myVerticalGradient.GradientStops.Add( new GradientStop(Colors.Yellow, 0.0)); myVerticalGradient.GradientStops.Add( new GradientStop(Colors.Red, 0.25)); myVerticalGradient.GradientStops.Add( new GradientStop(Colors.Blue, 0.75)); myVerticalGradient.GradientStops.Add( new GradientStop(Colors.LimeGreen, 1.0)); // Use the brush to paint the rectangle. verticalFillRectangle.Fill = myVerticalGradient;
下图显示了上一示例创建的渐变。
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有关更多示例，请参见 Brush 示例。有关渐变以及其他类型的画笔的更多信息，请参见使用纯色和渐变进行绘制概述。
更多代码
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