Re: [Dev-C++] Whoops - drawing in Windows

[Carlos d. M. <cg...@wo...>]

You can create a DC where you select a bitmap, you draw in that bitmap an=
d you
BitBlt to the window each time you need it: when sizing and restoring, wh=
en you
draw something...

Daniel Glenfield escribi=F3:

> 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 Scr=
ibble
> tutorial that comes with VC++ - have a look on MSDN for it.
>
> >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 are=
a 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 t=
ried
> >to use a memory DC an bitmap to save the contents in, and BitBlt it ba=
ck in
> >response to WM_PAINT message, but the program just "froze". Can anybod=
y
> >give me a hint how to do it? Here's the code used for drawing lines wi=
thout
> >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=3D=3DMK_LBUTTON)    /*if line is selecte=
d
> >(itool=3D0) and left button presed*/
> >                    {
> >                          HDC hDC=3DGetDC(hwnd);
> >
> >                        HPEN hPen=3DCreatePen(PS_SOLID,iCurWidth,crCur=
Color);
> >                        HPEN hOldPen=3D(HPEN)SelectObject(hDC,hPen);
> >                        CLine* pLine=3Dnew
> >CLine(ptPrevPos,MAKEPOINTS(lParam),iCurWidth,crCurColor); /*create new=
 line
> >object*/
> >                        pLine->DrawLine(hDC);
> >                        ptPrevPos=3DMAKEPOINTS(lParam);
> >                        SelectObject(hDC,hOldPen);
> >                        DeleteDC(hDC);
> >                    }
> >                 }
> >                 break;
> >                 case 1: /* nothing here yet*/
> >                 break;
> >             }
> >         }
>
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