quartz-2d

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How do I apply multiple color masks using CGImageCreateWithMaskingColors?

I\'m a bit new to objective-c and even newer at programming with Quartz 2D, so apologies in advance!I\'ve got a method where I would like to remove a handful of specific colors (not just one) from a U[详细]

2023-02-09 08:12 分类：问答
Quartz2D how to save the current context and then draw over it?

I\'m trying to draw using Quartz2D and but i\'m finding the drawing to lag a lot right after a few dots. Therefore I am wondering how can I cach开发者_开发百科e the current context into a bmp or a jpg[详细]

2023-02-07 10:41 分类：问答
Efficient method to draw a line with millions of points

I\'m writing an audio waveform editor in Cocoa with a wide range of zoom options. At its widest, it shows a waveform for an entire song (~10 million samples in view). At its narrowest, it shows a pixe[详细]

2023-02-07 10:09 分类：问答
Clipping a CGGradient to a CGPath

I\'ve been banging my head against the wall for a long while trying to figure out why this is not working.[详细]

2023-02-06 13:57 分类：问答
How to search text in pdf document with quartz

I\'m using quartz to display pdf. I need to get the indexes of pages where my searching text exists. Anyone can help me? Thanks.[详细]

2023-02-05 18:35 分类：问答
Quartz2D good way to Draw point or line on touch?

I\'m trying to develop an app that requires drawing based on user touch. I\'m using Quartz2D a开发者_如何转开发nd CoreGraphics for drawing, now I\'m wondering what\'s a good way to manage the points t[详细]

2023-02-05 09:30 分类：问答
"Flatten" or "Merge" Quartz 2D drawn lines

I\'m trying to figure out how you can flatten or merge alot of dynamicly drawn lines in Quartz 2D, I\'m drawing random lines over time on my stage, I add new line coordinates each time to an array a[详细]

2023-02-05 04:28 分类：问答
gradient in CGContextAddArc?

I am using following code for Drawing Arc in DrawRect...I want to draw Arc onlywith gradient effect ...any help please?[详细]

2023-02-04 19:30 分类：问答
create a non-rectangular UIView

I need to create a view (a uibutton) of strange shape. Is this possible with quartz2d? i used this code for buil my UIView subclass[详细]

2023-01-31 20:43 分类：问答
Why the presentationLayer of a view doesn't work correctly for me?

I want to get the position of a view while it is being animated and moving from one position to another[详细]

2023-01-29 09:19 分类：问答