I have a pdf document which has some dat开发者_如何学运维a stored in it. I want to write some more data to same file. I think it will be possible by Quartz 2D programming using transperancy layers.
I am trying to draw some pixels (NSRects that are 1x1) on a NSWindow in mac os, but when I do that it randomly pics a window to draw it o开发者_开发问答n (see below). It is supposed to be on the left
When I\'m using a UIBezierPath to draw where the user is touching if the user moves to fast sometimes I get really hard points like the tip of a triangle. Any clue what might be causing th开发者_如何学
I use this code to draw a line in quartz2d CGPoint currentPoint = CGPointMake(rascalImage.center.x, rascalImage.center.y);
For any paint program you need to be able to dr开发者_如何学JAVAaw lines in response to user gestures.
I\'ve load an image into narrow UIImageView - the width is 3px, the height is approx. 10 Then I\'ve rotate the view - and I\'ve got not p开发者_开发技巧leasant picture, with visual distortion (like h
I am drawing several CGPaths in a Cocoa view in the drawRect method on an iPad.I started out drawing them straight to the UIGraphicsGetCurrentContext() context, but performance went south when my path
I wrote a view to render a PDF Page: -(UIPDFRenderView*) initWithFrame:(CGRect)frame withDocument:(CGPDFDocumentRef*)document withPageNumber:(int)pageNumber
I am trying to make a simple drawing app atm to learn. As far I got this: CGContextRef context = UIGraphicsGetCurrentContext();
I am trying to clip a portion of an image I take with a camera. Here\'s my clipping code: - (UIImage*) maskImage:(UIImage *)image {
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