WPF提供各种2D图形,可根据您的应用要求进行增强. WPF支持用于绘制图形内容的Drawing和Shape对象.
Shape类派生自FrameworkElement类,Shape对象可以在面板和大多数控件中使用.
WPF提供了一些基本的形状对象派生自Shape类,如Ellipse,Line,Path,Polygon,Polyline和Rectangle.
另一方面,绘图对象不派生来自FrameworkElement类并提供更轻量级的实现.
与Shape对象相比,绘图对象更简单.它们也有更好的性能特征.
让我们举一个简单的例子来理解如何使用不同的形状对象.
创建一个名为 WPF2DGraphics 的新WPF项目.
以下代码会创建不同类型的形状.
<Window x:Class = "WPF2DGraphics.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local = "clr-namespace:WPF2DGraphics" xmlns:PresentationOptions = "http://schemas.microsoft.com/winfx/2006/xaml/present ation/options" mc:Ignorable = "PresentationOptions" Title = "MainWindow" Height = "400" Width = "604"> <StackPanel> <Ellipse Width = "100" Height = "60" Name = "sample" Margin = "10"> <Ellipse.Fill> <RadialGradientBrush> <GradientStop Offset = "0" Color = "AliceBlue"/> <GradientStop Offset = "1" Color = "Gray"/> <GradientStop Offset = "2" Color = "Red"/> </RadialGradientBrush> </Ellipse.Fill> </Ellipse> <Path Stroke = "Red" StrokeThickness = "5" Data = "M 10,70 L 200,70" Height = "42.085" Stretch = "Fill" Margin = "140.598,0,146.581,0" /> <Path Stroke = "BlueViolet" StrokeThickness = "5" Data = "M 20,100 A 100,56 42 1 0 200,10" Height = "81.316" Stretch = "Fill" Margin = "236.325,0,211.396,0" /> <Path Fill = "LightCoral" Margin = "201.424,0,236.325,0" Stretch = "Fill" Height = "124.929"> <Path.Data> <PathGeometry> <PathFigure StartPoint = "50,0" IsClosed = "True"> <LineSegment Point = "100,50"/> <LineSegment Point = "50,100"/> <LineSegment Point = "0,50"/> </PathFigure> </PathGeometry> </Path.Data> </Path> </StackPanel> </Window>
当你编译并执行上面的代码时,它会产生一个椭圆,一条直线,一个弧和一个多边形.
让我们来看看另一个示例显示如何使用绘图绘制区域.
创建名为的新WPF项目WPF2DGraphics1 .
以下XAML代码显示了如何使用不同的图像绘制.
<Window x:Class = "WPF2DGraphics1.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:PresentationOptions = "http://schemas.microsoft.com/winfx/2006/xaml/present ation/options" xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable = "PresentationOptions" xmlns:local = "clr-namespace:WPF2DGraphics1" Title = "MainWindow" Height = "350" Width = "604"> <Grid> <Border BorderBrush = "Gray" BorderThickness = "1" HorizontalAlignment = "Left" VerticalAlignment = "Top" Margin = "20"> <Image Stretch = "None"> <Image.Source> <DrawingImage PresentationOptions:Freeze = "True"> <DrawingImage.Drawing> <DrawingGroup> <ImageDrawing Rect = "300,100,300,180" ImageSource = "Images\DSC_0104.JPG"/> <ImageDrawing Rect = "0,100,250,100" ImageSource = "Images\DSC_0104.JPG"/> <ImageDrawing Rect = "150,0,25,25" ImageSource = "Images\DSC_0104.JPG"/> <ImageDrawing Rect = "0,0,75,75" ImageSource = "Images\DSC_0104.JPG"/> </DrawingGroup> </DrawingImage.Drawing> </DrawingImage> </Image.Source> </Image> </Border> </Grid> </Window>