Question

What GDI methods can I use to draw the blue shape shown in the image below? The center must be transparent.

Answer 1

There are a number of ways but you’ll probably want to use the following:

FillRectangle
FillPolygon
DrawLine

since it looks like your shape can be reduced to a rectangle and two polygons and then outlined by a few lines.

Here is a really simple and hard-coded example of what i was thinking:

Private Sub Control_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) _
Handles MyBase.Paint
    Dim g As Graphics = e.Graphics

    g.FillRectangle(Brushes.Aqua, New Rectangle(10, 10, 10, 90))
    g.FillPolygon(Brushes.Aqua, New Point() { _
        New Point(10, 10), _
        New Point(20, 10), _
        New Point(40, 50), _
        New Point(30, 50)})
    g.FillPolygon(Brushes.Aqua, New Point() { _
        New Point(10, 100), _
        New Point(20, 100), _
        New Point(40, 50), _
        New Point(30, 50)})
    g.DrawLine(Pens.Black, New Point(10, 10), New Point(10, 100))
    g.DrawLine(Pens.Black, New Point(10, 100), New Point(20, 100))
    g.DrawLine(Pens.Black, New Point(20, 100), New Point(40, 50))
    g.DrawLine(Pens.Black, New Point(40, 50), New Point(20, 10))
    g.DrawLine(Pens.Black, New Point(20, 10), New Point(10, 10))

…