Question

I would like to draw an opaque line on a control in c#.

I tried this with visual basic powerpacks shapecontrol.. but I couldn’t find any properties that set opacity.

How do I draw an opaque line ?

Thanks,

Answer 1

This code will draw a cross of two half-transparent white lines.

WPF

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" Background="LightGray">
    <Grid>
        <Line X1="0" Y1="0" X2="100" Y2="100" Stroke="White" Opacity=".5" StrokeThickness="10" />
        <Line X1="0" Y1="100" X2="100" Y2="0" Stroke="White" Opacity=".5" StrokeThickness="10" />
    </Grid>
</Window>

Windows.Forms

var pen = new Pen(Color.FromArgb(128, 255, 255, 255), 10);
using (var g = CreateGraphics())
{
    g.DrawLine(pen, 0, 0, 100, 100);
    g.DrawLine(pen, 0, 100, 100, 0);
}