quartz-graphics

New to Quartz and I am curious on the drawing speeds of simple shapes, gradients, and shadows; specifically comparing Quartz drawing functions to Quartz image drawing on the iPhone. Say that I need to draw a filled, stroked, and shadowed rectangle. I'm assuming that importing a pre-baked rect as a PNG and drawing it using drawInRect: or drawAtPoint: is faster than using Quartz's drawing functions to draw the same thing, since the latter requires explicit calculations. On the other hand, drawing an image I assume increases memory use and application size since I have to import the image and

In Mac OS X Lion CARemoteLayerServer and CARemoteLayerClient were added to QuartzCore. I've been trying to investigate if they'd be suitable for splitting a graphical application between multiple processes, but without success. I can use them successfully within a single process, with some code along the lines of this: - (void)buildLayerSingleProcess { CARemoteLayerServer *server = [CARemoteLayerServer sharedServer]; self.client = [[CARemoteLayerClient alloc] initWithServerPort: server.serverPort]; uint32_t clientID = self.client.clientId; CALayer *layer1 = [CALayer layer]; layer1.bounds =

I am developing an iP* game and I make use of both UIKit and OpenGL ES 2.0. The UIKit elements are rendered over the OpenGL view and occupy a significant (arbitrary) amount of screen space. I must admit that Apple has done an excellent work and the frame rate of the game is always 60 FPS. In order to come to this conclusion I made many tests regarding the performance: I added lots of static (not moving) UIViews over the OpenGL view -- OK! I animated using custom code the same UIViews (modified the center property in the drawFrame method of my game) -- OK!. I added many OpenGL ES elements under

I want to draw a path gradually, i.e. I want the path to appear as if it is drawn by hand. I have managed to create the path I need. I have also managed to create a CAKeyFrameAnimation that uses this path. But so far I can only move an object along this path. I would like to both move an object (say a pencil) along the path, and have the path appear as if it is drawn. Any pointers? Create a CAShapeLayer with your path and animate the layer's strokeEnd from 0.0 to 1.0 . (This is new in iOS SDK 4.2, won't work with previous versions.) 来源： https://stackoverflow.com/questions/4390911/drawing-a

I'm new to Quartz. I have 2 images, a background, and a mask with cutout shape that I want to lay over the background in order to cut out a section. The resulting image should be the shape of the cutout. This is my mask (the shape in the middle is 0 alpha): And this is my code: UIView *canvas = [[[sender superview] subviews] objectAtIndex:0]; UIGraphicsBeginImageContext(canvas.bounds.size); CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef cgContext = CGBitmapContextCreate(NULL, canvas.bounds.size.width, canvas.bounds.size.height, 8, 0, colourSpace,