但是怎样把菱形图弄出来呢？

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Dim g As Graphics
Dim objBitmap As New Bitmap(100, 100)
Dim stringFont As New Font("宋体", 13, FontStyle.Bold)
Dim r As New Rectangle(50, 50, 20, 20)

Dim stringTitle As New Font("Times New Roman", 14, FontStyle.Bold)
'Dim stringFont As New Font("Times New Roman", 10, FontStyle.Bold)
Dim stringFormat As New StringFormat
Dim b As New SolidBrush(Color.Black)
Dim rTitle As RectangleF

g = Graphics.FromImage(objBitmap)
Dim p As New Pen(Color.Black, 1)
g.DrawLine(p, 0, 50, 50, 0)
g.DrawLine(p, 50, 0, 100, 50)
g.DrawLine(p, 100, 50, 50, 100)
g.DrawLine(p, 50, 100, 0, 50)
g.DrawString("测试", stringTitle, b, rTitle, StringFormat)
objBitmap.Save("aa.jpg")
End Sub