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.

 
AAPL
$116.47
Apple Inc.
+0.16
MSFT
$47.98
Microsoft Corpora
-0.72
GOOG
$537.50
Google Inc.
+2.67

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cobook 3.0.7 - Intelligent address book....
Cobook Contacts is an intuitive, engaging address book. Solve the problem of contact management with Cobook Contacts and its simple interface and powerful syncing and integration possibilities.... Read more
StatsBar 1.9 - Monitor system processes...
StatsBar gives you a comprehensive and detailed analysis of the following areas of your Mac: CPU usage Memory usage Disk usage Network and bandwidth usage Battery power and health (MacBooks only)... Read more
Cyberduck 4.6 - FTP and SFTP browser. (F...
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
Evernote 6.0.1 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
calibre 2.11 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital... Read more
Herald 5.0.1 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
Firetask 3.7 - Innovative task managemen...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more
TechTool Pro 7.0.6 - Hard drive and syst...
TechTool Pro is now 7, and this is the most advanced version of the acclaimed Macintosh troubleshooting utility created in its 20-year history. Micromat has redeveloped TechTool Pro 7 to be fully 64... Read more
PhotoDesk 3.0.1 - Instagram client for p...
PhotoDesk lets you view, like, comment, and download Instagram pictures/videos! (NO Uploads! / Image Posting! Instagram forbids that! AND you *need* an *existing* Instagram account). But you can do... Read more

Latest Forum Discussions

See All

Ubisoft Gives Everyone Two New Ways to E...
Ubisoft Gives Everyone Two New Ways to Earn In-Game Stuff for Far Cry 4 Posted by Jessica Fisher on November 21st, 2014 [ permalink ] | Read more »
Golfinity – Tips, Tricks, Strategies, an...
Dig this: Would you like to know what we thought of being an infinite golfer? Check out our Golfinity review! Golfinity offers unlimited ways to test your skills at golf. Here are a few ways to make sure your score doesn’t get too high and your... | Read more »
Dark Hearts, The Sequel to Haunting Meli...
Dark Hearts, The Sequel to Haunting Melissa, is Available Now Posted by Jessica Fisher on November 21st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Meowza! Toyze Brings Talking Tom to Life...
Meowza! | Read more »
Square Enix Announces New Tactical RPG f...
Square Enix Announces New Tactical RPG for Mobile, Heavenstrike Rivals. Posted by Jessica Fisher on November 21st, 2014 [ permalink ] With their epic stories and gorgeous graphics, | Read more »
Quest for Revenge (Games)
Quest for Revenge 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: The great Kingdom of the west has fallen. The gods ignore the prayers of the desperate. A dark warlord has extinguished... | Read more »
Threadz is a New Writing Adventure for Y...
Threadz is a New Writing Adventure for You and Your Friends Posted by Jessica Fisher on November 21st, 2014 [ permalink ] In the tradition of round-robin storytelling, | Read more »
SteelSeries Stratus XL Hardware Review
Made by: SteelSeries Price: $59.99 Hardware/iOS Integration Rating: 4 out of 5 stars Usability Rating: 4.5 out of 5 stars Reuse Value Rating: 4.25 out of 5 stars Build Quality Rating: 4.5 out of 5 stars Overall Rating: 4.31 out of 5 stars | Read more »
ACDSee (Photography)
ACDSee 1.0.0 Device: iOS iPhone Category: Photography Price: $1.99, Version: 1.0.0 (iTunes) Description: Capture, perfect, and share your photos with ACDSee. The ACDSee iPhone app combines an innovative camera, a powerful photo... | Read more »
ProTube for YouTube (Entertainment)
ProTube for YouTube 2.0.2 Device: iOS Universal Category: Entertainment Price: $1.99, Version: 2.0.2 (iTunes) Description: ProTube is the ultimate, fully featured YouTube app. With it's highly polished design, ProTube offers ad-free... | Read more »

Price Scanner via MacPrices.net

CEA Study Finds More People Recycling Electro...
A new study by the Consumer Electronics Association (CEA) finds that electronics recycling receives the continued and growing support of consumers. According to the CEA,s Recycling and Reuse Study,... Read more
15″ 2.2GHz Retina MacBook Pro on sale for $17...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale today for $1749. Shipping is free, and B&H charges NY sales tax only. B&H will also include free copies of Parallels Desktop... Read more
27-inch 3.5GHz 5K iMac in stock today and on...
 B&H Photo has the new 27″ 3.5GHz 5K iMac in stock today and on sale for $2299 including free shipping plus NY sales tax only. Their price is $200 off MSRP, and it’s the lowest price available... Read more
21-inch 1.4GHz iMac on sale for $979, save $1...
B&H Photo has the new 21″ 1.4GHz iMac on sale for $979.99 including free shipping plus NY sales tax only. Their price is $120 off MSRP. B&H will also include free copies of Parallels Desktop... Read more
13-inch 1.4GHz/256GB MacBook Air on sale for...
B&H Photo has lowered their price on the 13″ 1.4GHz/256GB MacBook Air to $1059.99 including free shipping plus NY sales tax only. Their price is $140 off MSRP, and it’s the lowest price for this... Read more
Save up to $400 with Apple refurbished 2014 1...
The Apple Store has restocked Apple Certified Refurbished 2014 15″ Retina MacBook Pros for up to $400 off the cost of new models. An Apple one-year warranty is included with each model, and shipping... Read more
New 13-inch 1.4GHz MacBook Air on sale for $8...
 Adorama has the 2014 13″ 1.4GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY & NJ tax only. Their price is $100 off MSRP. B&H Photo has the 13″ 1.4GHz/128GB MacBook... Read more
Apple Expected to Reverse Nine-Month Tablet S...
Apple and Samsung combined accounted for 62 percent of the nearly 36 million branded tablets shipped in 3Q 2014, according to early vendor shipment share estimates from market intelligence firm ABI... Read more
Stratos: 30 Percent of US Smartphone Owners t...
Stratos, Inc., creator of the Bluetooth Connected Card Platform, has announced results from its 2014 Holiday Mobile Payments Survey. The consumer survey found that nearly one out of three (30 percent... Read more
2014 1.4GHz Mac mini on sale for $449, save $...
 B&H Photo has lowered their price on the new 1.4GHz Mac mini to $449.99 including free shipping plus NY tax only. Their price is $50 off MSRP, and it’s the lowest price available for this new... Read more

Jobs Board

*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
*Apple* Solutions Consultant (ASC)- Retail S...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Store Leader Program - College Gradu...
Job Description: Job Summary As an Apple Store Leader Program agent, you can continue your education as you major in the art of leadership at the Apple Store. You'll Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.