I\'m writing a paint app. When drawing a line in CGContext, the background with the size of the bounding box of the line is alwa开发者_如何学运维ys got erased - the underlying lines in that box will
I\'m using CGEventCreateKeyboardEvent and need to know what CGKeyCode values to use. Specifically, I am after the key code for the Command key. The docs give examples for other keys: z is 6, shift is
I am trying to read a PDF on iPhone, I got to know that we can get the info about PDF from CGPDFDocumentGetCatalog metho开发者_Go百科d. But, this method returns a CGPDFDictionaryRef. I have browsed th
I have in front of me two Quartz iPhone apps.In each of them, calls to setNeedsDisplay cause a view to redraw itself.But there is an important difference.In one case (the \"Quartz Fun\" app from the M
I\'ve been at this for awhile, it seems that there\'s many ways to go about this in quartz 2d: 1) Draw text using core graphics methods...
I am developing an application in which I need to draw dotted lines between a couple o开发者_JS百科f points. I tried
I\'d like to create a fade out affect with one of my bitmap contexts that I use to draw a static image in one of my views.What\'s an easy way to adjust the overall opacity of the bitmap context on the
I\'m having som开发者_StackOverflow中文版e performance issues calling CGContextDrawLayerAtPoint in iOS 4 that didn\'t seem to exist in previous version of the OS.
I\'m trying to work out what the best way to draw over the top of all other items on the screen on OS X. I don\'t want to impede the user\'s ability to interact with their applications, but want to \'
I am trying to manipulate an image using a chain of CIFilters, and then examine each byte of the resulting image (bitmap).Long term, I do not need to display the resulting image (bitmap) -- I just nee
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