Visual Basic .NET Language GDI+ Create Graphic Object
Example
There are three ways to create a graphics object
- From the Paint Event
Every time the control is redrawn (resized, refreshed...) this event is called, use this way if you want the control to consistently draw on the control
'this will work on any object's paint event, not just the form
Private Sub Form1_Paint(sender as Object, e as PaintEventArgs) Handles Me.Paint
Dim gra as Graphics
gra = e.Graphics
End Sub
- Create Graphic
This is most often used when you want to create a one time graphic on the control, or you don't want the control to repaint itself
Dim btn as New Button
Dim g As Graphics = btn.CreateGraphics
- From an Existing Graphic
Use this method when you want to draw and change an existing graphic
'The existing image can be from a filename, stream or Drawing.Graphic
Dim image = New Bitmap("C:\TempBit.bmp")
Dim gr As Graphics = Graphics.FromImage(image)
