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C# panel drawing on button press

Anonymous User 3659 13-Nov-2013

I want to update the panel graphics (panel will contain simple shapes like circles and rectangles) every time a button is pressed. The code would look something like this:

private void PanelGraphics()
{
   
ClearThePanel();  //empties the
panel
   
FillThePanel();   //draws new
shapes in the panel
}
The function would be then called every time a button is pressed, and I understand button_events well enough so that's not a problem. However, I have no idea how to pull off the PanelGraphics() function, and a few links about panel_paint events didn't help me much.
c# c# 
Updated on 13-Nov-2013
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1 Answers

Anonymous User

Anonymous User

13-Nov-2013
Hi Chintoo,

You can draw to the panel by creating a graphics controller to it.

Graphics g = panel.CreateGraphics();

You can then use the Graphic class's plethora of methods to draw whatever you want to the panel

g.DrawCurve(parameters);
g.DrawEllipse(parameters);
g.DrawLine(parameters);
g.DrawRectangle(parameters);

To clear the panel the easiest way is to draw a box the colour of the background to the panel

g.DrawRectangle(new Pen(panel.BackColor), new Rectangle(new Point(), panel.Size));

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