I\'m trying to figure out how to draw a color map like this: http://www.ritsplasman.com/images/colormap.png
I\'m looking for some poin开发者_StackOverflow社区ters on how to create a turnable button like the knobs in garageband (iPad). I want to use this for a custom volume knob.
In GL, I have used some kind of this stuff, glMatrixMode(GL_MODELVIEW); glLoadId开发者_如何转开发entity();
I have overriden an UIView to make some custom draw : // ========================================================================================
I\'m doing some 开发者_如何学运维core graphics, and I wonder how I may know if a line will have some parts of it visible on screen.
Is it a good practice to divide draw开发者_开发问答Rect, for a several methods? For example, UIView class which should draw a pie chart, has a drawRect which call multiple helper methods(for instance
I have an NSAttributedString which I would like to draw into a CGImage so that I can later draw the CGImage into an NSView. Here\'s what I have so far:
This issue has been encountered by someone else, but I\'ve not seen any solutions - see ( http://openradar.appspot.com/6941930 ).
I am simply trying to draw a bunch of lines to a view, depending on user interaction. For example, the 开发者_开发知识库user presses a button, and one line is drawn. The user presses another button, a
I have a problem drawing objects passing this graphic context CGContextRef context = UIGraphicsGetCurrentContext();
加载中,请稍侯......