WPF画箭头

1. 做上位机软件，经常会用到用箭头表示设备的连接次序，但是WPF似乎没有现成的箭头可用，所以只能通过Draw的方式自己画。其实可以通过VS Blend绘制，然后再导入到界面中，下面的这种方式也是这么实现的，只不过绘制出来之后直接可以以后用！

a. 首先导入Microsoft.Expression.Drawing.dll

b. 在界面中加入引用xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing"

c. 在前端xaml文件中绘制箭头

<ed:LineArrow Grid.Column="1" Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="0.878" Stroke="Black" VerticalAlignment="Center" MinWidth="50" RenderTransformOrigin="0.5,0.5">
          <ed:LineArrow.RenderTransform>
                     <TransformGroup>
                               <ScaleTransform/>
                               <SkewTransform/>
                               <RotateTransform/>
                               <TranslateTransform/>
                      </TransformGroup>
           </ed:LineArrow.RenderTransform>
</ed:LineArrow>

2. 在后台绘制直线（该部分转自LeeMacroFeng，https://www.cnblogs.com/LeeMacrofeng/p/7878898.html）

a. 通过Line画线

<Line X1="50" Y1="20" X2="400" Y2="20" Stroke="Red" StrokeThickness="10"></Line>
        <Line X1="10" Y1="40" X2="260" Y2="40" Stroke="Blue"  StrokeThickness="6"></Line>
        <Line X1="10" Y1="60" X2="260" Y2="20" Stroke="Black"  StrokeThickness="6"></Line>
        <Line X1="20" Y1="60" X2="360" Y2="60" Stroke="Green"  StrokeThickness="3"></Line>
        <Line X1="30" Y1="80" X2="460" Y2="80" Stroke="Purple"  StrokeThickness="1"></Line>
        <Line X1="40" Y1="90" X2="460" Y2="90" Stroke="Black"  StrokeThickness="2"></Line>
        <Line X1="10" Y1="110" X2="360" Y2="110" StrokeDashArray="3" Stroke="RosyBrown"  StrokeThickness="6"></Line>
        <Line X1="10" Y1="120" X2="360" Y2="120" StrokeDashArray="5" Stroke="RosyBrown"  StrokeThickness="6"></Line>
        <Line X1="50" Y1="140" X2="460" Y2="140" StrokeEndLineCap="Flat" Stroke="Brown"  StrokeThickness="6"></Line>
        <Line X1="40" Y1="155" X2="460" Y2="155" StrokeEndLineCap="Triangle" Stroke="Brown"  StrokeThickness="8"></Line>
        <Line X1="200" Y1="10" X2="200" Y2="500" Stroke="Red" StrokeDashArray="10" StrokeThickness="9"></Line>

        <Line X1="40" Y1="170" X2="460" Y2="170"  StrokeEndLineCap="Round"   StrokeThickness="8">
            <Line.Stroke>
                <LinearGradientBrush EndPoint="0,0.5" StartPoint="1,0.5">
                    <GradientStop Color="Blue"/>
                    <GradientStop Offset="1"/>
                </LinearGradientBrush>
            </Line.Stroke>
        </Line>

b. 通过Rectangle画线

<Rectangle Grid.Column="1" Fill="#FFA89F9F" Width="1" Margin="4,3,4.6,3"/>

c. 通过Border画线