Draw a single pixel dot
Once again GDI+ resolution independence jumps up to bite you in the soft and tender parts. There is no PlotPixel function in GDI+ that allows you to draw directly on the GDI Graphics surface as we used to be able to in GDI..
To draw a dot of a specific colour on your screen you must resort to the following shenanigans.
- Create a 1x1 bitmap image
- Set its only pixel to the colour you desire using Bitmap.SetPixel
- use Graphics.DrawImageUnscaled(...) to draw the dot in the correct place
The following example assume that they are in a Paint event handler.
[C#]
Bitmap bm=new Bitmap(1,1);
bm.SetPixel(0,0,Color.Red);
e.Graphics.DrawImageUnscaled(bm,<xPosition>,<yPosition>);
[VB]
Dim bm as new Bitmap(1,1)
bm.SetPixel(0,0,Color.Red)
e.Graphics.DrawImageUnscaled(bm,<xPosition>,<yPosition>)
Remember that you don't have to create the bitmap every time you draw it. You can store a 1 pixel bitmap for the lifetime of the application and just copy it over and over. |