Re: [Dev-C++] Whoops - drawing in Windows
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Re: [Dev-C++] Whoops - drawing in Windows
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From: Daniel G. <sp...@ho...> - 2002-10-24 12:16:09
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I'm sure the linked list is the right way to do it, I just can't remember
the specifics.
>From: "Vlada Djurovic" <dj...@im...>
>To: "Daniel Glenfield"
><sp...@ho...>,<dev...@li...>
>Subject: Re: [Dev-C++] Whoops - drawing in Windows
>Date: Thu, 24 Oct 2002 14:02:32 +0200
>
>
>----- Original Message -----
>From: "Daniel Glenfield" <sp...@ho...>
>To: <dj...@im...>; <dev...@li...>
>Sent: Thursday, October 24, 2002 11:59 AM
>Subject: Re: [Dev-C++] Whoops - drawing in Windows
>
>
> > Nope maybe not, serialising is for saving and restoring.
> >
> > I think you have to store the info in to an array, but looking at this
>old
> > code I cannot remember what exactly you have to do. I worked on the
>Scribble
> > tutorial that comes with VC++ - have a look on MSDN for it.
> >
> >
>I tried to store all the info in a linked list, but I think I did something
>wrong because the program just froze when I tried to draw something. Then I
>thought it would be easier to store the drawing in a compatible memory
>bitmap and then just copy it back in the client area when it needs to be
>redrawn, but this also didn't work because the program froze again. That's
>why I was asking if anyone can give me some guidelines about how to do this
>(the bitmap way).
>As for the tutorials, I read the book "Teach yourself VC++ in 21 days"
>which
>also has some stuff about this, but although I think I did everything the
>way it's done in VC++- it doesn't work.
>
>Regards, Vlada
> >
> > >From: "Vlada Djurovic" <dj...@im...>
> > >To: "'DevC++ help'" <dev...@li...>
> > >Subject: [Dev-C++] drawing in Windows
> > >Date: Thu, 24 Oct 2002 10:32:16 +0200
> > >
> > >Hi, everybody
> > >Here's my problem: I'm trying to write a simple drawing app (just for
> > >exercise) and so far its been going OK. I can draw lines in client area
>in
> > >different colors, but when ever I minimize or maximize the window, or
> > >something similar happenes, all the content of the window is gone. I
>tried
> > >to use a memory DC an bitmap to save the contents in, and BitBlt it
>back
>in
> > >response to WM_PAINT message, but the program just "froze". Can anybody
> > >give me a hint how to do it? Here's the code used for drawing lines
>without
> > >any restoring parts:
> > >
> > > case WM_MOUSEMOVE:
> > > {
> > > switch(iTool) /* iTool is used for dtetrmining
>which
> > >drawing tool is selected(line, rect etc.)*/
> > > {
> > > case 0:
> > > {
> > > if(wParam==MK_LBUTTON) /*if line is selected
> > >(itool=0) and left button presed*/
> > > {
> > > HDC hDC=GetDC(hwnd);
> > >
> > > HPEN
>hPen=CreatePen(PS_SOLID,iCurWidth,crCurColor);
> > > HPEN hOldPen=(HPEN)SelectObject(hDC,hPen);
> > > CLine* pLine=new
> > >CLine(ptPrevPos,MAKEPOINTS(lParam),iCurWidth,crCurColor); /*create new
>line
> > >object*/
> > > pLine->DrawLine(hDC);
> > > ptPrevPos=MAKEPOINTS(lParam);
> > > SelectObject(hDC,hOldPen);
> > > DeleteDC(hDC);
> > > }
> > > }
> > > break;
> > > case 1: /* nothing here yet*/
> > > break;
> > > }
> > > }
> >
> >
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