使用鼠标事件绘制折线

Question

我正在尝试使用WPF创建绘图应用程序.

我使用Canvas,我在MouseMove事件触发的位置绘制Polyline.但是在此过程中会创建一些工件:

StrokeThickness at 4:

StrokeThickness at 15:

红点表示MouseMove触发的位置,灰线当然是具有所有红点的折线.

任何想法为什么我得到这个？

Answer 1

如果StrokeLineJoin=Miter那时你可以StrokeMiterLimit用来控制斜接延伸的距离.

(StrokeLineJoin=Mitre是a的默认值PolyLine)

或者,您可以使用StrokeLineJoin=Round在段之间进行良好的转换.

使用StrokeStartLineCap,StrokeEndLineCap如果你想要不同的目的.

<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="500" Width="500">
    <Window.Resources>
        <PointCollection x:Key="points">0,0 10,30 15,0 18,60 23,30 35,30 40,0 43,60 48,30 100,30</PointCollection>
    </Window.Resources>
<StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
    <StackPanel Orientation="Horizontal">
        <Polyline Stroke="Gray" StrokeThickness="4" Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="4" StrokeMiterLimit="10" Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="4" StrokeMiterLimit="5"  Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="4" StrokeMiterLimit="1"  Points="{StaticResource points}" />
    </StackPanel>
    <StackPanel Orientation="Horizontal" Margin="0,50,0,0">
        <Polyline Stroke="Gray" StrokeThickness="10" Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="10" StrokeMiterLimit="10" Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="10" StrokeMiterLimit="5"  Points="{StaticResource points}" />
        <Polyline Stroke="Gray" StrokeThickness="10" StrokeMiterLimit="1"  Points="{StaticResource points}" />
    </StackPanel>
        <StackPanel Orientation="Horizontal" Margin="0,50,0,0">
            <Polyline Stroke="Gray" StrokeThickness="10" StrokeLineJoin="Miter" StrokeStartLineCap="Round" StrokeEndLineCap="Round" Points="{StaticResource points}" />
            <Polyline Stroke="Gray" StrokeThickness="10" StrokeLineJoin="Bevel" StrokeStartLineCap="Round" StrokeEndLineCap="Round" Points="{StaticResource points}" />
            <Polyline Stroke="Gray" StrokeThickness="10" StrokeLineJoin="Round" StrokeStartLineCap="Round" StrokeEndLineCap="Round" Points="{StaticResource points}" />
        </StackPanel>
    </StackPanel>
</Window>