progress bar code in vb net 2010 5: Frameworks in Xcode in Objective-C

Drawing DataMatrix in Objective-C 5: Frameworks in Xcode

CHAPTER 5: Frameworks in Xcode
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glViewport(0, 0, (GLsizei)newSize.width, (GLsizei)newSize.height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); [[glView openGLContext] update]; }
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Next comes the drawRect method, where the really hard work is happening. Once again, this method is called when the view needs to redraw and does not need to be explicitly called (see Listing 5 7).
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Listing 5 7. drawRect - (void)drawRect:(NSRect)rect { [super drawRect:rect]; [[glView openGLContext] makeCurrentContext]; // clear the background this sets a pale blue-ish 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(); // the arguments to glRotatef determine the axes of rotation // (in this case, x and y) 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 this draws a teapot at the center of the viewport glTranslatef(0, 0, 0); glutSolidTeapot(0.5); glEndList(); } else { glCallList(displayList); } glFinish(); }
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First the graphics context is established. This is in effect the environment in which the drawing happens. Then the method clears the view and sets the background to a pale blue color. It then sets up a variety of OpenGL properties governing the placement and lighting for the diagram. Finally it draws the teapot. Note that if you go exploring in glut.h you will find method signatures for a whole range of shapes, including spheres, toruses, cubes, and so on. You might like to try adding drawing steps for other shapes either in addition or as alternatives to the teapot. Now add the code for the animation. This is much shorter it simply sets the incremental rotation for the object and refreshes the display. If this were a simple example, all of the drawing code might be in animateOneFrame, and in that case you wouldn t need to add the setNeedsDisplay command (see Listing 5 8).
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CHAPTER 5: Frameworks in Xcode
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Listing 5 8. animateOneFrame - (void)animateOneFrame { rotation += 0.2f; [self setNeedsDisplay:YES]; }
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You are also going to need a dealloc method to ensure you free up the memory you have allocated, shown in Listing 5 9:
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Listing 5 9. Freeing Up the Unneeded Memory - (void)dealloc { [glView removeFromSuperview]; [glView release]; [super dealloc]; }
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If you have galloped ahead and built and installed the screen saver, you will probably have noticed that it doesn t work. I m afraid I have deliberately left it until now to mention that there is a peculiarity (let s not mince words to a relative layman like me, it s a bug) in the way that drawRect works. It has to do with opaque views. In effect your screen saver is working, it s just working in an opaque view, and hence you can t see anything. This needs fixing, obviously. Here is what you do. First, create a new Objective-C class file. Call it TLOpenGLView (create the .h and .m files when asked). Now, make the TLOpenGLView.h file look like this (only the bold line in Listing 5 10 needs changing):
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Listing 5 10. Fixing the View Opacity in the TLOpenGLView Header File #import <Cocoa/Cocoa.h> @interface TLOpenGLView : NSOpenGLView { } @end
In the corresponding .m file, you need to tell the application that the view is not opaque after all (see Listing 5 11):
Listing 5 11. Fixing the View Opacity in the TLOpenGLView Implementation File #import "TLOpenGLView.h" @implementation TLOpenGLView - (BOOL)isOpaque { return NO; } @end
CHAPTER 5: Frameworks in Xcode
Next, you need to visit the TumblingTeapot.h file (see Listing 5 12):
Listing 5 12. Implementing the Changes in TumblingTeapot.h #import <ScreenSaver/ScreenSaver.h> #import "TLOpenGLView.h" @interface TumblingTeapotView : ScreenSaverView { TLOpenGLView *glView; GLfloat rotation; int displayList; } - (void)startUpOpenGL; @end
And finally you need to make a single change in TumblingTeapot.m, in the initWithFrame method, shown in Listing 5 13:
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