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Listing 5 13. The Final Change in TumblingTeapot.m
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- (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
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{ self = [super initWithFrame:frame isPreview:isPreview]; if (self) { NSOpenGLPixelFormatAttribute attributes[] = {NSOpenGLPFAAccelerated, NSOpenGLPFADepthSize, 16, NSOpenGLPFAMinimumPolicy, NSOpenGLPFAClosestPolicy, 0}; NSOpenGLPixelFormat *format; format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease]; glView = [[TLOpenGLView alloc] initWithFrame:NSZeroRect pixelFormat:format]; if (!glView) { NSLog(@"Couldn't get Open GL View going"); [self autorelease]; return nil; } [self addSubview:glView]; [self startUpOpenGL]; [self setAnimationTimeInterval:1/30.0]; } return self; }
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Listings 5 14 to 5 17 show the completed TLOpenGLView.h, TLOpenGLView.m, TumblingTeapot.h, and TumblingTeapot.m files.
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Listing 5 14. TLOpenGLView.h #import <Cocoa/Cocoa.h> @interface TLOpenGLView : NSOpenGLView { }
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CHAPTER 5: Frameworks in Xcode
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@end Listing 5 15. TLOpenGLView.m #import "TLOpenGLView.h" @implementation TLOpenGLView - (BOOL)isOpaque { return NO; } @end Listing 5 16. TumblingTeapot.h #import <ScreenSaver/ScreenSaver.h> #import "TLOpenGLView.h" @interface TumblingTeapotView : ScreenSaverView { TLOpenGLView *glView; GLfloat rotation; int displayList; } - (void)startUpOpenGL; @end Listing 5 17. TumblingTeapot.m #import "TumblingTeapotView.h" #import <GLUT/glut.h> @implementation TumblingTeapotView - (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview { self = [super initWithFrame:frame isPreview:isPreview]; if (self) { NSOpenGLPixelFormatAttribute attributes[] = {NSOpenGLPFAAccelerated, NSOpenGLPFADepthSize, 16, NSOpenGLPFAMinimumPolicy, NSOpenGLPFAClosestPolicy, 0}; NSOpenGLPixelFormat *format; format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease]; glView = [[TLOpenGLView alloc] initWithFrame:NSZeroRect pixelFormat:format]; if (!glView) { NSLog(@"Couldn't get OpenGL View going"); [self autorelease]; return nil; } [self addSubview:glView]; [self startUpOpenGL]; [self setAnimationTimeInterval:1/30.0]; } return self; }
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CHAPTER 5: Frameworks in Xcode
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- (void)dealloc { [glView removeFromSuperview]; [glView release]; [super dealloc]; } - (void)startUpOpenGL { NSLog(@"starting up OpenGL"); [[glView openGLContext] makeCurrentContext]; // configure the view glShadeModel(GL_SMOOTH); glEnable(GL_LIGHTING); glEnable(GL_DEPTH_TEST); // add ambient lighting GLfloat ambient[] = {0.2, 0.2, 0.2, 1.0}; glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient); // initialise the light GLfloat diffuse[] = {1.0, 1.0, 1.0, 1.0}; glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse); // turn light on glEnable(GL_LIGHT0); // set material properties under ambient light // These values for the mat array will give a // dark purple colour to the teapot GLfloat mat[] = {0.9, 0.1, 0.7, 1.0}; glMaterialfv(GL_FRONT, GL_AMBIENT, mat); // set material properties under diffuse light glMaterialfv(GL_FRONT, GL_DIFFUSE, mat); rotation = 0.0f; } -(void)setFrameSize:(NSSize)newSize { [super setFrameSize:newSize]; [glView setFrameSize:newSize]; [[glView openGLContext] makeCurrentContext]; glViewport(0, 0, (GLsizei)newSize.width, (GLsizei)newSize.height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); [[glView openGLContext] update]; } - (void)startAnimation { [super startAnimation]; } - (void)stopAnimation { [super stopAnimation];
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CHAPTER 5: Frameworks in Xcode
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} - (void)drawRect:(NSRect)rect { [super drawRect:rect]; [[glView openGLContext] makeCurrentContext]; // clear the background glClearColor(0.75, 0.75, 0.95, 0.0); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // set the viewpoint glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef( rotation, 1.0f, 1.0f, 0.0f ); // put the light in place GLfloat lightPosition [] = {1.6, 1, 3, 0.0}; glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); if (!displayList) { displayList = glGenLists(1); glNewList(displayList, GL_COMPILE_AND_EXECUTE); // do the drawing glTranslatef(0, 0, 0); glutSolidTeapot(0.5); glEndList(); } else { glCallList(displayList); } glFinish(); } - (void)animateOneFrame { rotation += 0.2f; [self setNeedsDisplay:YES];} - (BOOL)hasConfigureSheet { return NO; } - (NSWindow*)configureSheet { return nil; } @end
Right, it s time to run the finished screensaver. You can t actually run or simulate screen savers within Xcode, so there is nothing for it but to install it. First, build the application (use B, or choose the Build Build menu item. All being well you should see the message Build succeeded in the Xcode workspace status bar. Having built it, you need to go and find the built application. In the Finder, locate your project folder, and in that open the build and then Debug folders. You should see your newly created TumblingTeapot.saver file.
CHAPTER 5: Frameworks in Xcode
Double-click this file and you will see a message asking whether you want to install the screen saver just for you or for all users. Choose one of the options (it doesn t really matter which it s probably easier to install it just for you since you then don t need to authenticate as an admin user) and click Install.
Summary
You ve achieved a lot in this chapter. By now you should be very comfortable working with Interface Builder, and understanding how actions, connections, and bindings work. You have grappled with some of the most important Cocoa frameworks and have written some neat applications into the bargain. In 6, you are going to take a closer look at Model View Controller, the design principle that underlies most of the development work you will do in Cocoa. You will see a couple of examples that I hope will cement this architectural pattern for you (remember, this is one of those major barriers to understanding that you need to overcome to get a good working relationship with Cocoa). If you have ever seen this phrase, or its acronym MVC, batted around and felt that you weren t quite sure what it meant, this next chapter is for you.
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