WM_ON_PAINT gets called too much
in [MFC]
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From: Nick Schultz on 24 Apr 2008 12:40 Hi there, I'm developing an application that requires multiple OpenGL windows within their own floating CDockablePane. I used examples from this article ( http://www.gamedev.net/reference/articles/article1358.asp) to create the OpenGL classes, (I had to convert the main class from being a CView to a CWnd, however) The CDockablePanes consist of a toolbar docked on the bottom and OpenGL window taking up the rest of the Pane. I am able to draw separate pictures in each window just fine. The problem I have is that WM_ON_PAINT is constantly being called, sucking all processor resources. (for painting a simple square) It's getting called even when each window is still, not being overlapped by any other window. Why is WM_ON_PAINT being called so much? Is there anyway to stop it? Also, if you have any suggestions on using OpenGL windows, feel free to let me know. Thanks, Nick
From: Scott McPhillips [MVP] on 24 Apr 2008 12:51 "Nick Schultz" <NickSchultz(a)discussions.microsoft.com> wrote in message news:EC3B6CE2-8424-4F87-9962-163EEBE38107(a)microsoft.com... > Hi there, I'm developing an application that requires multiple OpenGL > windows > within their own floating CDockablePane. I used examples from this > article ( > http://www.gamedev.net/reference/articles/article1358.asp) to create the > OpenGL classes, (I had to convert the main class from being a CView to a > CWnd, however) The CDockablePanes consist of a toolbar docked on the > bottom > and OpenGL window taking up the rest of the Pane. > > I am able to draw separate pictures in each window just fine. The problem > I > have is that WM_ON_PAINT is constantly being called, sucking all processor > resources. (for painting a simple square) It's getting called even when > each > window is still, not being overlapped by any other window. > > Why is WM_ON_PAINT being called so much? Is there anyway to stop it? > Also, > if you have any suggestions on using OpenGL windows, feel free to let me > know. This typically happens if you fail to use CPaintDC in your WM_PAINT message handler. That class, and only that class, properly validates the window after you have painted. -- Scott McPhillips [VC++ MVP]
From: Nick Schultz on 24 Apr 2008 13:03 Solved. Fixed by adding: ValidateRect(NULL); To the end of my OnPaint() message handler. Thanks for pointing me in the right direction! Nick "Scott McPhillips [MVP]" wrote: > "Nick Schultz" <NickSchultz(a)discussions.microsoft.com> wrote in message > news:EC3B6CE2-8424-4F87-9962-163EEBE38107(a)microsoft.com... > > Hi there, I'm developing an application that requires multiple OpenGL > > windows > > within their own floating CDockablePane. I used examples from this > > article ( > > http://www.gamedev.net/reference/articles/article1358.asp) to create the > > OpenGL classes, (I had to convert the main class from being a CView to a > > CWnd, however) The CDockablePanes consist of a toolbar docked on the > > bottom > > and OpenGL window taking up the rest of the Pane. > > > > I am able to draw separate pictures in each window just fine. The problem > > I > > have is that WM_ON_PAINT is constantly being called, sucking all processor > > resources. (for painting a simple square) It's getting called even when > > each > > window is still, not being overlapped by any other window. > > > > Why is WM_ON_PAINT being called so much? Is there anyway to stop it? > > Also, > > if you have any suggestions on using OpenGL windows, feel free to let me > > know. > > > This typically happens if you fail to use CPaintDC in your WM_PAINT message > handler. That class, and only that class, properly validates the window > after you have painted. > > -- > Scott McPhillips [VC++ MVP] > >
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