quartz-2d

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How to Draw in existing PDF?

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.[详细]

2023-04-02 11:34 分类：问答
Quartz is drawing on a different window

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[详细]

2023-04-01 22:57 分类：问答
UIBezierPath Gives Sharp Edges

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[详细]

2023-04-01 05:57 分类：问答
How can you perform an erase function for a certain point in Quartz2d drawing?

I use this code to draw a line in quartz2d CGPoint currentPoint = CGPointMake(rascalImage.center.x, rascalImage.center.y);[详细]

2023-03-30 22:12 分类：问答
Quartz2D: How to draw into a bitmap context and show result without copying

For any paint program you need to be able to dr开发者_如何学JAVAaw lines in response to user gestures.[详细]

2023-03-29 22:17 分类：问答
iPhone: anti-aliasing after rotating

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[详细]

2023-03-29 14:29 分类：问答
CGLayer and Anti-aliased CGPaths

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[详细]

2023-03-26 12:13 分类：问答
How to draw a PDF to a CGContext with a higher resolution?

I wrote a view to render a PDF Page: -(UIPDFRenderView*) initWithFrame:(CGRect)frame withDocument:(CGPDFDocumentRef*)document withPageNumber:(int)pageNumber[详细]

2023-03-25 11:18 分类：问答
Drawing with Quartz2D several 'Images' Array problem?

I am trying to make a simple drawing app atm to learn. As far I got this: CGContextRef context = UIGraphicsGetCurrentContext();[详细]

2023-03-25 09:15 分类：问答
Image is rotated 90 degrees when using clipToMask

I am trying to clip a portion of an image I take with a camera. Here\'s my clipping code: - (UIImage*) maskImage:(UIImage *)image {[详细]

2023-03-23 07:03 分类：问答