如何在WPF中的行或路径上将图像用作ImageBrush

Question

我有一个Canvas,我在其上绘制线条(通过线条或路径),指示用户要遵循的道路.有没有办法改变线条,以便显示重复的图像？我正在寻找的是有一个步骤图标(png具有透明度)而不是直线.

谢谢!

Answer 1

这将绘制一个重复的图像作为中风Path.Laborate的价值观Viewport可以实现您的目标

<Path StrokeThickness="10" Data="M 10,10 100,10" Stretch="Fill">
    <Path.Stroke>
        <ImageBrush ImageSource="C:\arrow.gif" Viewport="0,0,0.1,1" TileMode="Tile"/>
    </Path.Stroke>
</Path>

更新

要旋转ImageBrush,您可以向其添加RotateTransform

        <ImageBrush ImageSource="C:\arrow.gif" Viewport="0,0,1,0.1" TileMode="Tile">
            <ImageBrush.Transform>
                <RotateTransform Angle="90"/>
            </ImageBrush.Transform>
        </ImageBrush>

如果您想要一个遵循路径的图像,您可以使用类似的方法作为此问题的答案.我稍微修改了它以使用Image

<Window.Resources>
    <PathGeometry x:Key="Path" x:Shared="False" Figures="M 10,100 C 35,0 135,0 160,100 180,190 285,200 310,100"/>
    <Image x:Key="followPathImage" x:Shared="False" x:Name="Arrow1" Source="C:\arrow.gif" Width="16" Height="16">
        <Image.RenderTransform>
            <TransformGroup>
                <TranslateTransform X="-8" Y="-8"/>
                <MatrixTransform>
                    <MatrixTransform.Matrix>
                        <Matrix/>
                    </MatrixTransform.Matrix>
                </MatrixTransform>
            </TransformGroup>
        </Image.RenderTransform>
        <Image.Triggers>
            <EventTrigger RoutedEvent="Image.Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <MatrixAnimationUsingPath Storyboard.Target="{Binding RelativeSource={RelativeSource AncestorType={x:Type Image}}}" 
                                                  Storyboard.TargetProperty="RenderTransform.Children[1].Matrix"                                 
                                                  DoesRotateWithTangent="True" 
                                                  Duration="0:0:5"  
                                                  BeginTime="0:0:0" 
                                                  RepeatBehavior="Forever"
                                                  PathGeometry="{StaticResource Path}" >
                        </MatrixAnimationUsingPath>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Image.Triggers>
    </Image>
</Window.Resources>
<Canvas Width="400" Height="400" Name="canvas">
    <Path Data="{StaticResource Path}" Opacity="0" Stroke="Blue" StrokeThickness="1"/>
    <Button Canvas.Left="184" Canvas.Top="253" Content="Button" Height="23" Name="button1" Width="75" Click="button1_Click" />
</Canvas>

还有一些代码可以添加动画箭头

public MainWindow()
{
    InitializeComponent();
    var addAnimationThread = new Thread(new ThreadStart(() =>
    {
        for (int i = 0; i < 25; i++)
        {
            Dispatcher.Invoke(new Action(() =>
            {
                Image image = this.FindResource("followPathImage") as Image;
                canvas.Children.Add(image);
            }));
            Thread.Sleep(199);
        }
    }));
    addAnimationThread.Start();
}