RE: Problems drawing GDI+ text

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

Thanks Jack for your reply!

Hi Bob,

What Jack has explained and suggested is correct.

You should draw the text in the Paint event handler of the Panel. When you
need to draw a new text in the Panel, just call the Invalidate method of
the Panel to get the Panel to redraw itself.

The following is a sample:

Public Class Form1

Private font As Font = Nothing

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
font = New Font("Arial", 18, FontStyle.Regular)
End Sub

Private myText As String = ""

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
myText = Me.TextBox1.Text
Me.Panel1.Invalidate()
End Sub

' Every time the Panel redraws itself, it draw all strings
Private Sub Panel1_Paint(ByVal sender As System.Object, ByVal e As
System.Windows.Forms.PaintEventArgs) Handles Panel1.Paint
e.Graphics.DrawString("existing string", font, Brushes.Black, 0, 0)

If (Not myText.Equals("")) Then
e.Graphics.DrawString(myText, font, Brushes.Black, 0, 20)
End If
End Sub
End Class

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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