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@#$%^&* ... Graphics!

Posted on 2004-10-10
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Last Modified: 2011-10-03
Here's a small sample C# app which demonstrates the problem.
http://www.qpop.com/RokSizPap.zip

This is my first attempt at an OO graphics game using .NET .... This stuff is driving me NUTS!
How do I make a manually drawn image ...

     Persist when overlayed by another window (WITHOUT FLICKER)?
     Resize when needed?
     Scroll within a form if a certain minimum size (800x600) is reached?

I've tried everything I can think of.
    Using: the Form only, a Panel, a Picture box
    Using: Paint event and/or Resize event

BTW ...
I'm working on building an computerized version of this game for eventual on-line playing
http://www.qpop.com/RSP.zip

It's taken a LOT of help from the EE-Math & Science guys to get this far!

P.S. This is not "THE" Qpop project discussed in the lounge. This is just me ... relaxing and playing.
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Question by:volking
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LVL 10

Expert Comment

by:ptmcomp
ID: 12270577
The problem is that you set the control styles on the form but you draw on the panel. If you set the control styles on the panel it should be already much better.
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LVL 10

Expert Comment

by:ptmcomp
ID: 12270589
And you should use the Graphics object obtained by the PaintEventArgs instead of creating your own.
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Expert Comment

by:ptmcomp
ID: 12270647
You should not change the size of the panel inside the Paint event. This causes serious problems. You can override the OnResize method to resize the control.
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LVL 10

Expert Comment

by:ptmcomp
ID: 12270883
Then try to seperate the calculations that are based on the resizing from the paint algorithm. Cache the calculations for the next paint event. And don't paint inside a constructor.
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Author Comment

by:volking
ID: 12271724
@ ptmcomp - I'll try everything you suggest and let you know.  thanks for the advice.
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Accepted Solution

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ptmcomp earned 2000 total points
ID: 12271863
To change the control styles of the panel you will need to derrive your own class from Panel and use it instead of the standard panel class. If you want to avoid this then remove the panel and paint directly on the Form.
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LVL 5

Author Comment

by:volking
ID: 12271896
I did derive my own class from panel (as you advised) and I followed all the rest of your advice and .... SHAZAAAAM!

Worked like a beautiful thing ...

Many Thanks!
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Expert Comment

by:ptmcomp
ID: 12271994
BTW: You can optimize more when your checking the e.ClipRectangle of the PaintEventArgs. If the object you are going to paint is completely outside of this Rectangle, it will not be drawn anyway and you can skip painting it. E.g. when part of your control was covered by a window and gets visible again, only that part is redrawn.
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