Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!mcvax!prlb2!kulcs!kulesat!esat!bartels
From: bartels@haydn.kulesat.uucp
Newsgroups: comp.sys.mac.programmer
Subject: Help, greyvalue images on the Macintosh
Summary: I just started to program in C on a Macintosh. I have some problems
Keywords: colorquickdraw, C, greyvalueimages
Message-ID: <991@haydn.kulesat.uucp>
Date: 3 Apr 89 11:21:22 GMT
Reply-To: bartels@kulesat.uucp
Organization: Katholieke Universiteit Leuven,ESAT - dep. Elect. Engineering, Belgium
Lines: 94

Dear Macintosh Users,



		I have some problems with writing a program in MPW-C to put 
a grey-value image on the screen. See here mine program: 

#include <Types.h>
#include <Memory.h>
#include <Quickdraw.h>
#include <Palette.h>
#include <Fonts.h>
#include <Events.h>
#include <Menus.h>
#include <Windows.h>
#include <TextEdit.h>
#include <Dialogs.h>
#include <Desk.h>
#include <OSUtils.h>
#include <ToolUtils.h>
#include <SegLoad.h>
#include <stdio.h>

typedef BitMap *BitMapPtr;

main()
{
CWindowPtr ImagePort;
CTabHandle CThan;
Handle Image;
Rect Imagerect;
PixMapHandle ImageMap;
int i;
CWindowRecord wRecord;
long int refCon;

InitGraf(&qd.thePort);
InitFonts();
InitWindows();
InitMenus();
TEInit();
InitDialogs(nil);
InitCursor();

/*opening a window for putting the image in*/
SetRect(&Imagerect,20,20,400,400);
ImagePort = (CWindowPtr) NewCWindow((Ptr) &wRecord,&Imagerect,
             "Mijn eerste beeld",1,documentProc, (WindowPtr) -1 ,0,refCon = 4);
/*intializing of color look up table*/
CThan = (CTabHandle) (NewHandle(255 * 4 + 10));
(*CThan)->ctSeed = GetCTSeed();
(*CThan)->ctFlags = 0;
(*CThan)->ctSize = 256;
for (i=1; i<=255; i++)
  {(*CThan)->ctTable[i].value = i;
   (*CThan)->ctTable[i].rgb.red = (short) (255 * i);
   (*CThan)->ctTable[i].rgb.green = (short) (255 * i);
   (*CThan)->ctTable[i].rgb.blue = (short) (255 * i);};
/* initializing of grey value image */
Image = NewHandle(128*128);
for (i=0; i<=128*128-1; i++)
{*(*Image + i) = (short)(i/255);}
SetRect(&Imagerect,0,0,128,128);
ImageMap = NewPixMap();
(*ImageMap)->baseAddr = *Image;
(*ImageMap)->rowBytes = (0x8000|128);
(*ImageMap)->bounds = Imagerect;
(*ImageMap)->pmTable = CThan;
CopyBits(((BitMapPtr)*ImageMap),((BitMapPtr)*(ImagePort->portPixMap)),
         &Imagerect,&Imagerect,0,0);
}

The program doesn't pass the line 
Image = NewHandle(128*128);
except when I decrease the dimensions of the image to 28 * 28. With the little
image there apears something on the screen but after running the program I had
to restart the computer.

		Now I am searching for some example programs (I prefer C 
programs) to put greyvalue images on the Macintosh screen. Hoping someone 
can help me, I thank you to study mine  problem

					Yours sincerly,
								
									
					Rudi Bartels
					KU Leuven 
					Faculteit der Toegepaste Wetenschappen
					ESAT-MI2
					Kard. Mercierlaan 94
					3030 Heverlee
					Belgium
					email: bartels@kulesat.uucp
					Fax: 32-16-221855