TweetFollow Us on Twitter

Color Basics
Volume9
Number11
Column TabGetting Started

Related Info: Color QuickDraw Control Panel Gestalt Manager

The Basics of Color Quickdraw

Using a color grafport and multiple monitors

By Dave Mark, MacTech Magazine Regular Contributing Author

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Last month’s column introduced some of the basics of C++ and object programming. This month, we’ll turn our attention back to C and the Macintosh Toolbox. This month’s column introduces one of the most enjoyable parts of the Mac Toolbox, Color QuickDraw. Along the way, we’ll learn how to use Gestalt(), the Toolbox function that knows everything there is to know about the current state of your Macintosh.

So far, about the only real experience we’ve had with color has been with a program that displayed a color PICT in a window. Since any possible color work was handled by the routine DrawPicture(), we won’t even count that as color experience. This month’s program is called ColorMondrian, a colorized version of an early Mac Primer program called Mondrian.

Mondrian created a window and drew a never-ending series of randomly generated QuickDraw shapes in the window. All this was done in the plain old black-and-white of QuickDraw version 1, the version of QuickDraw that shipped with the original 128K Macintosh.

Ever since the introduction of the Macintosh II, all Macs have shipped with a new version of QuickDraw known as Color QuickDraw, also known as 8-bit Color QuickDraw. As the technology marched on, 24-bit and then 32-bit Color QuickDraw made their way into the Toolbox. For now, we’ll concentrate on the features common to all flavors of Color QuickDraw.

ColorMondrian starts by checking to see if Color QuickDraw is available on the current Macintosh. If so, it looks at each of the displays connected to the Mac (remember, your Mac can have multiple monitors hooked up at the same time!) to determine which display is the deepest, that is, can display the largest number of colors. For example, if you have an 8-bit monitor (256 simultaneous colors) and a 1-bit monitor (black and white only), ColorMondrian will identify the 8-bit monitor as the deepest.

Next, ColorMondrian will open a color window on the specified monitor and start drawing randomly sized QuickDraw shapes in randomly selected colors. If your deepest monitor is gray-scale, don’t worry. Shades of gray count as colors too!

Let’s get started. As has been the case of late, we’ll get the program running this month, then walk through the code next month.

Creating the ColorMondrian Resources

Start by creating a folder labeled ColorMondrian in your Development folder. Next, launch ResEdit and create a new file called ColorMondrian.Π.rsrc in the ColorMondrian folder.

Create a new MBAR resource with a resource id of 128. Enter the MENU ids 128, 129, 130, and 131 as shown in Figure 1.

Figure 1. The MBAR resource.

Next, create four MENU resources. The first, having a resource id of 128, will match the menu shown in Figure 2. It’s an • menu with a single item, About ColorMondrian....

Figure 2. The • menu.

The second menu should match the one shown in Figure 3. The title is File with a single item, Be sure to add the command-key equivalent, Q.

Figure 3. The File menu.

The third menu should match the one shown in Figure 4. It’s a standard Edit menu with a single separator line and all the standard command-key equivalents.

Figure 4. The Edit menu.

The fourth menu consists of a title and no items. The title is Devices, as shown in Figure 5.

Figure 5. The Devices menu.

Next you’ll create two ALRT resources along with their respective DITLs, one for displaying error messages, and one to bring up when About ColorMondrian... is selected from the • menu. First the error ALRT. Create an ALRT resource with a resource id of 128, using the sizing info in Figure 6.

Figure 6. Specifications for the error ALRT.

Double-click on the alert window to bring up a DITL editor. Create two items, an OK button (Figure 7) and a static text item (Figure 8).

Figure 7. Specifications for the OK button.

Figure 8. Specification for the static text item.

Now create a second ALRT with a resource id of 129. using the sizing info in Figure 9.

Figure 9. Specifications for the about ALRT.

Double-click on the alert window to bring up a DITL editor. Create two items, an OK button (Figure 10) and a static text item (Figure 11).

Figure 10. Specifications for the OK button.

Figure 11. Specification for the static text item.

Creating the ColorMondrian Project

Quit ResEdit, being sure to Save your changes. Now launch THINK C and create a new project named ColorMondrian.Π in the ColorMondrian folder. Add the MacTraps and ANSI libraries to the project (In THINK 6, ANSI is inthe Standard Libraries folder - add it in its own segment), then create a new source code window. Save the window as ColorMondrian.c and Add it to the project as well.

Type in this source code, being sure to save periodically:

/* 1 */

#include <stdio.h>
#include <GestaltEqu.h>


#define kMBARResID 128
#define kErrorAlertID128
#define kAboutALRTid 129

#define kSleep   0L

#define kAutoStorage NULL
#define kVisible true
#define kWindowTitle "\pColor Mondrian"
#define kMoveToFront (WindowPtr)-1
#define kNoGoAwayfalse
#define kNULLRefCon60L

#define mApple   128
#define iAbout   1

#define mFile    129
#define iQuit    1

#define mDevice  131

#define kWindowMargin5

#define kRandomUpperLimit 32768

#define kEmptyString "\p"
#define kNULLFilterProc   NULL

/*************/
/*  Globals  */
/*************/

Boolean gDone;

/***************/
/*  Functions  */
/***************/

void    ToolboxInit( void );
void    MenuBarInit( void );
void    CreateWindow( GDHandle device );
void    EventLoop( void );
void    DoEvent( EventRecord *eventPtr );
void    HandleMouseDown( EventRecord *eventPtr );
void    HandleMenuChoice( long menuChoice );
void    HandleAppleChoice( short item );
void    HandleFileChoice( short item );
void    HandleDeviceChoice( short item );
Boolean HasColorQD( void );
GDHandleGetDeepestDevice( void );
short   GetDeviceDepth( GDHandle device );
void    DrawRandomRect( void );
void    RandomColor( RGBColor *colorPtr );
void    RandomRect( Rect *rectPtr );
short Randomize( short range );
void    DoError( Str255 errorString );


/****************** main ***************************/

void main( void )
{
 ToolboxInit();
 
 if ( ! HasColorQD() )
 DoError( 
 "\pThis machine doesn't support Color Quickdraw!" );
 
 MenuBarInit();
 
 CreateWindow( GetDeepestDevice() );
 
 EventLoop();
}


/****************** ToolboxInit *********************/

void ToolboxInit( void )
{
 InitGraf( &thePort );
 InitFonts();
 InitWindows();
 InitMenus();
 TEInit();
 InitDialogs( nil );
 InitCursor();
}


/****************** MenuBarInit ***********************/

void MenuBarInit( void )
{
 Handle menuBar;
 MenuHandle menu;
 GDHandle device, deepestDevice;
 Str255 itemStr;
 short  curDeviceNumber = 1;
 
 menuBar = GetNewMBar( kMBARResID );
 SetMenuBar( menuBar );

 menu = GetMHandle( mApple );
 AddResMenu( menu, 'DRVR' );
 
 menu = GetMHandle( mDevice );
 
 deepestDevice = GetDeepestDevice();
 
 device = GetDeviceList();
 
 while ( device != NULL )
 {
 itemStr[0] = 10;
 sprintf( (char *)(&(itemStr[1])), "0x%08lX", 
 (unsigned long)device );
 AppendMenu( menu, itemStr );
 
 if ( device == deepestDevice )
 CheckItem( menu, curDeviceNumber, true );
 
 device = GetNextDevice( device );
 curDeviceNumber++;
 }
 
 DrawMenuBar();
}


/****************** CreateWindow ***********************/

void CreateWindow( GDHandle device )
{
 WindowPtrwindow;
 Rect   wBounds;
 
 wBounds = (**device).gdRect;
 
 if ( device == GetMainDevice() )
 wBounds.top += GetMBarHeight();
 
 InsetRect( &wBounds, kWindowMargin, kWindowMargin );
 
 window = NewCWindow( kAutoStorage, &wBounds, kWindowTitle, 
 kVisible, altDBoxProc, kMoveToFront, 
 kNoGoAway, kNULLRefCon );
 
 if ( window == nil )
 {
 DoError( "\pCouldn't create window!" );
 }
 else
 {
 ShowWindow( window );
 SetPort( window );
 }
}


/******************************** EventLoop *********/

void EventLoop( void )
{
 EventRecordevent;
 
 GetDateTime( (unsigned long *)(&randSeed) );
 
 gDone = false;
 while ( gDone == false )
 {
 if ( WaitNextEvent( everyEvent, &event, kSleep, nil ) )
 DoEvent( &event );
 
 DrawRandomRect();
 }
}


/************************************* DoEvent *********/

void DoEvent( EventRecord *eventPtr )
{
 char   theChar;
 
 switch ( eventPtr->what )
 {
 case mouseDown: 
 HandleMouseDown( eventPtr );
 break;
 case keyDown:
 case autoKey:
 theChar = eventPtr->message & charCodeMask;
 if ( (eventPtr->modifiers & cmdKey) != 0 ) 
 HandleMenuChoice( MenuKey( theChar ) );
 break;
 }
}


/****************************** HandleMouseDown *********/

void HandleMouseDown( EventRecord *eventPtr )
{
 WindowPtrwindow;
 short  thePart;
 long   menuChoice;
 
 thePart = FindWindow( eventPtr->where, &window );

 switch ( thePart )
 {
 case inMenuBar:
 menuChoice = MenuSelect( eventPtr->where );
 HandleMenuChoice( menuChoice );
 break;
 case inSysWindow : 
 SystemClick( eventPtr, window );
 break;
 }
}


/****************** HandleMenuChoice ***********************/

void HandleMenuChoice( long menuChoice )
{
 short  menu;
 short  item;
 
 if ( menuChoice != 0 )
 {
 menu = HiWord( menuChoice );
 item = LoWord( menuChoice );
 switch ( menu )
 {
 case mApple:
 HandleAppleChoice( item );
 break;
 case mFile:
 HandleFileChoice( item );
 break;
 case mDevice:
 HandleDeviceChoice( item );
 break;
 }
 HiliteMenu( 0 );
 }
}


/****************** HandleAppleChoice ***********************/

void HandleAppleChoice( short item )
{
 MenuHandle appleMenu;
 Str255 accName;
 short  accNumber;
 
 switch ( item )
 {
 case iAbout:
 NoteAlert( kAboutALRTid, kNULLFilterProc );
 break;
 default:
 appleMenu = GetMHandle( mApple );
 GetItem( appleMenu, item, accName );
 accNumber = OpenDeskAcc( accName );
 break;
 }
}


/****************** HandleFileChoice ***********************/

void HandleFileChoice( short item )
{
 switch ( item )
 {
 case iQuit :
 gDone = true;
 break;
 }
}


/****************** HandleDeviceChoice **********************/

void HandleDeviceChoice( short item )
{
/* Try this: 
 Modify the program so that when a device is selected
 from the Device menu, the current window gets closed and a
 new window is opened on the selected device. Be careful when
 you translate the menu item back into an address. Debug your
 program thoroughly before you try to use the address as an
 address. You don't want to accidentally reformat your hard 
 drive, right?
 
 Also, don't forget to update the check mark!
*/
}


/****************** HasColorQD *****************/

Boolean HasColorQD( void )
{
 unsigned char   version[ 4 ];
 OSErr  err;
 
 err = Gestalt( gestaltQuickdrawVersion, (long *)version );
 
 if ( err != noErr )
 {
 SysBeep( 10 );  /*  Error calling Gestalt!!!  */
 ExitToShell();
 }
 
 if ( version[ 2 ] > 0 )
 return( true );
 else
 return( false );
}


/****************** GetDeepestDevice *****************/

GDHandle GetDeepestDevice( void )
{
 GDHandle curDevice, maxDevice = NULL;
 short  curDepth, maxDepth = 0;
 
 curDevice = GetDeviceList();
 
 while ( curDevice != NULL )
 {
 curDepth = GetDeviceDepth( curDevice );
 
 if ( curDepth > maxDepth )
 {
 maxDepth = curDepth;
 maxDevice = curDevice;
 }

 curDevice = GetNextDevice( curDevice );
 }
 
 return( maxDevice );
}


/****************** GetDeviceDepth *****************/

short GetDeviceDepth( GDHandle device )
{
 PixMapHandle  screenPixMapH;
 
 screenPixMapH = (**device).gdPMap;
 
 return( (**screenPixMapH).pixelSize );
}


/****************** DrawRandomRect *****************/

void DrawRandomRect( void )
{
 Rect   randomRect;
 RGBColor color;
 
 RandomRect( &randomRect );
 RandomColor( &color );
 RGBForeColor( &color );
 PaintOval( &randomRect );
}


/****************** RandomColor *********************/

void RandomColor( RGBColor *colorPtr )
{
 colorPtr->red = Random() + 32767;
 colorPtr->blue = Random() + 32767;
 colorPtr->green = Random() + 32767;
}


/****************** RandomRect *********************/

void RandomRect( Rect *rectPtr )
{
 WindowPtrwindow;

 window = FrontWindow();
 
 rectPtr->left = Randomize( window->portRect.right
 - window->portRect.left );
 rectPtr->right = Randomize( window->portRect.right
 - window->portRect.left );
 rectPtr->top = Randomize( window->portRect.bottom
 - window->portRect.top );
 rectPtr->bottom = Randomize( window->portRect.bottom
 - window->portRect.top );
}


/****************** Randomize **********************/

short Randomize( short range )
{
 long   randomNumber;
 
 randomNumber = Random();
 
 if ( randomNumber < 0 )
 randomNumber *= -1;
 
 return( (randomNumber * range) / kRandomUpperLimit );
}


/***************** DoError ********************/

void DoError( Str255 errorString )
{
 ParamText( errorString, kEmptyString, 
 kEmptyString, kEmptyString );
 
 StopAlert( kErrorAlertID, kNULLFilterProc );
}

Running ColorMondrian

Save your changes, then select Run from the Project menu. If ColorQuickDraw is not available on your machine (unlikely), an error message will appear. Otherwise, a window, similar to the one shown in Figure 12, will appear on the monitor with the deepest pixel settings.

Figure 12. ColorMondrian in action.

Bring the Finder to the front by selecting Finder from the applications menu at the right end of the menu bar. Notice that ColorMondrian stops dead in its tracks. Go back to ColorMondrian and select Quit from the File menu. Back in THINK C, select Set Project Type... from the Project menu. Set the value in the SIZE Flags field to 5880 (you don’t have to fiddle with the popup menu - you can just type the number in the field).

You’ve just set ColorMondrian up to continue processing events even when it is running in the background. To prove this, select Run from the Project menu, then bring the Finder to the front again. This time, ColorMondrian will continue running, even in the background.

Next, click on the Devices menu. A hex address will appear for every monitor attached to your Macintosh. A check-mark will appear next to the address representing the monitor with the deepest settings. You’ll find out what the address or addresses are for in next month’s column. Figure 13 shows my Devices menu. As you can see, I’ve got two monitors attached to my Mac.

Figure 13. My devices menu.

If you’ve got more than one monitor on your machine, try using the Monitors control panel to set one monitor to 1-bit and the other to a deeper setting. Run ColorMondrian. The window should appear on the deeper monitor. Now switch the settings so that the second monitor has the deeper settings. Run ColorMondrian again. Now the window should appear on the other monitor.

Till Next Month...

Next, month we’ll get into all the theory behind ColorMondrian. Till then, take a look through the code, then read up on Color QuickDraw in the pages of Inside Macintosh or on your Mac, courtesy of THINK Reference.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

EtreCheck 3.4.2 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
Hopper Disassembler 4.2.10- - Binary dis...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
VueScan 9.5.81 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
iFFmpeg 6.4.2 - Convert multimedia files...
iFFmpeg is a comprehensive media tool to convert movie, audio and media files between formats. The FFmpeg command line instructions can be very hard to master/understand, so iFFmpeg does all the hard... Read more
Fantastical 2.4.1 - Create calendar even...
Fantastical 2 is the Mac calendar you'll actually enjoy using. Creating an event with Fantastical is quick, easy, and fun: Open Fantastical with a single click or keystroke Type in your event... Read more
Fantastical 2.4.1 - Create calendar even...
Fantastical 2 is the Mac calendar you'll actually enjoy using. Creating an event with Fantastical is quick, easy, and fun: Open Fantastical with a single click or keystroke Type in your event... Read more
Live Home 3D Pro 3.2.2 - $69.99
Live Home 3D Pro, a successor of Live Interior 3D, is the powerful yet intuitive home design software that lets you build the house of your dreams right on your Mac. It has every feature of Live Home... Read more
Live Home 3D Pro 3.2.2 - $69.99
Live Home 3D Pro, a successor of Live Interior 3D, is the powerful yet intuitive home design software that lets you build the house of your dreams right on your Mac. It has every feature of Live Home... Read more
FileZilla 3.27.0.1 - Fast and reliable F...
FileZilla (ported from Windows) is a fast and reliable FTP client and server with lots of useful features and an intuitive interface. Version 3.27.0.1: MSW: Add misssing file to .zip binary package... Read more
Spotify 1.0.59.395. - Stream music, crea...
Spotify is a streaming music service that gives you on-demand access to millions of songs. Whether you like driving rock, silky R&B, or grandiose classical music, Spotify's massive catalogue puts... Read more

Latest Forum Discussions

See All

The best deals on the App Store this wee...
There are quite a few truly superb games on sale on the App Store this week. If you haven't played some of these, many of which are true classics, now's the time to jump on the bandwagon. Here are the deals you need to know about. [Read more] | Read more »
Realpolitiks Mobile (Games)
Realpolitiks Mobile 1.0 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0 (iTunes) Description: PLEASE NOTE: The game might not work properly on discontinued 1GB of RAM devices (iPhone 5s, iPhone 6, iPhone 6 Plus, iPad... | Read more »
Layton’s Mystery Journey (Games)
Layton’s Mystery Journey 1.0.0 Device: iOS Universal Category: Games Price: $15.99, Version: 1.0.0 (iTunes) Description: THE MUCH-LOVED LAYTON SERIES IS BACK WITH A 10TH ANNIVERSARY INSTALLMENT! Developed by LEVEL-5, LAYTON’S... | Read more »
Full Throttle Remastered (Games)
Full Throttle Remastered 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Originally released by LucasArts in 1995, Full Throttle is a classic graphic adventure game from industry legend Tim... | Read more »
Stunning shooter Morphite gets a new tra...
Morphite is officially landing on iOS in September. The game looks like the space shooter we've been needing on mobile, and we're going to see if it fits the bill quite shortly. The game's a collaborative effort between Blowfish Studios, We're Five... | Read more »
Layton's Mystery Journey arrives to...
As you might recall, Layton's Mystery Journey is headed to iOS and Android -- tomorrow! To celebrate the impending launch, Level-5's released a new trailer, complete with an adorable hamster. [Read more] | Read more »
Sidewords (Games)
Sidewords 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Grab a cup of coffee and relax with Sidewords. Sidewords is part logic puzzle, part word game, all original. No timers. No... | Read more »
Noodlecake Games' 'Leap On!...
Noodlecake Games is always good for some light-hearted arcade fun, and its latest project, Leap On! could carry on that tradition. It's a bit like high stakes tetherball in a way. Your job is to guide a cute little blob around a series of floating... | Read more »
RuneScape goes mobile later this year
Yes, RuneScape still exists. In fact, it's coming to iOS and Android in just a few short months. Jagex, creators of the hit fantasy MMORPG of yesteryear, is releasing RuneScape Mobile and Old School RuneScape for mobile devices, complete with... | Read more »
Crash of Cars wants you to capture the c...
Crash of Cars is going full on medieval in its latest update, introducing castles and all manner of new cars and skins fresh from the Dark Ages. The update introduces a new castle-themed map (complete with catapults) and a gladiator-style battle... | Read more »

Price Scanner via MacPrices.net

Apple Move Away from White Label Event Apps C...
DoubleDutch, Inc., a global provider of Live Engagement Marketing (LEM) solutions, has made a statement in the light of a game-changing announcement from Apple at this year’s WWDC conference.... Read more
70 Year Old Artist Creates Art Tools for the...
New Hampshire-based developer Pirate’s Moon has announced MyArtTools 1.1.3, the update to their precision drawing app, designed by artist Richard Hoeper exclusively for use with the 12.9-inch iPad... Read more
Sale! New 2017 13-inch 2.3GHz MacBook Pros fo...
Amazon has new 2017 13″ 2.3GHz/128GB MacBook Pros on sale today for $150 off MSRP including free shipping. Their prices are the lowest available for these models from any reseller: – 13″ 2.3GHz/128GB... Read more
13″ 2.3GHz/128GB Space Gray MacBook Pro on sa...
MacMall has the 13″ 2.3GHz/128GB Space Gray MacBook Pro (MPXQ2LL/A) on sale for $1219 including free shipping. Their price is $80 off MSRP. Read more
Clearance 2016 12-inch Retina MacBooks, Apple...
Apple recently dropped prices on Certified Refurbished 2016 12″ Retina MacBooks, with models now available starting at $1019. Apple will include a standard one-year warranty with each MacBook, and... Read more
Save or Share
FotoJet Designer, is a simple but powerful new graphic design apps available on both Mac and Windows. With FotoJet Designer’s 900+ templates, thousands of resources, and powerful editing tools you... Read more
Logo Maker Shop iOS App Lets Businesses Get C...
A newly released app is designed to help business owners to get creative with their branding by designing their own logos. With more than 1,000 editable templates, Logo Maker Shop 1.0 provides the... Read more
Sale! New 15-inch MacBook Pros for up to $150...
Amazon has the new 2017 15″ MacBook Pros on sale for up to $150 off MSRP including free shipping: – 15″ 2.8GHz MacBook Pro Space Gray: $2249 $150 off MSRP – 15″ 2.89Hz MacBook Pro Space Gray: $2779 $... Read more
DEVONthink To Go 2.1.7 For iOS Brings Usabili...
DEVONtechnologies has updated DEVONthink To Go, the iOS companion to DEVONthink for Mac, with enhancements and bug fixes. Version 2.1.7 adds an option to clear the Global Inbox and makes the grid... Read more
15-inch 2.2GHz Retina MacBook Pro, Apple refu...
Apple has Certified Refurbished 2015 15″ 2.2GHz Retina MacBook Pros available for $1699. That’s $300 off MSRP, and it’s the lowest price available for a 15″ MacBook Pro. An Apple one-year warranty is... Read more

Jobs Board

Frameworks Engineering Manager, *Apple* Wat...
Frameworks Engineering Manager, Apple Watch Job Number: 41632321 Santa Clara Valley, California, United States Posted: Jun. 15, 2017 Weekly Hours: 40.00 Job Summary Read more
Product Manager - *Apple* Pay on the *Appl...
Job Summary Apple is looking for a talented product manager to drive the expansion of Apple Pay on the Apple Online Store. This position includes a unique Read more
*Apple* Retail - Multiple Positions - Apple...
SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions - Apple...
SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Payments Architect - *Apple* Pay - A...
Changing the world is all in a day's work at Apple . If you love innovation, here's your chance to make a career of it. You'll work hard. But the job comes with more Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.