本文介绍了一个WPF应用，展示了如何实现在Canvas上拖动图形元素（矩形）并同步更新与其相连的箭头线条的位置。通过监听鼠标事件，实现图形元素的移动，并动态调整箭头的起点和终点，以保持连线的正确性。
<Window x:Class="WpfApplication5.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Canvas Width="500" Height=" 300" Name="canvas">
<Rectangle Canvas.Left="12" Canvas.Top="131" Height="100" Name="r1" Stroke="Black" Width="200" MouseMove="ellipse1_MouseMove" MouseLeftButtonUp="ellipse1_MouseLeftButtonUp" MouseLeftButtonDown="ellipse1_MouseLeftButtonDown" Fill="#FF5C4444" />
<Rectangle Canvas.Left="288" Canvas.Top="23" Height="100" Name="r2" Stroke="Black" Width="200" MouseLeftButtonDown="ellipse1_MouseLeftButtonDown" MouseLeftButtonUp="ellipse1_MouseLeftButtonUp" MouseMove="ellipse1_MouseMove" Fill="#FFA34343" />
<Ellipse Canvas.Left="314" Canvas.Top="180" Height="100" Name="ellipse1" Stroke="Black" Width="200" MouseLeftButtonDown="ellipse1_MouseLeftButtonDown" MouseLeftButtonUp="ellipse1_MouseLeftButtonUp" MouseMove="ellipse1_MouseMove" Fill="#FFCE4747" />
</Canvas>
</Window>
后台代码
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