core-graphics

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Find Scale Value from CGAffineTransform

Ok, so I realize I can find the scale value from a layer\'s CATransform3D like this: float scale = [[layer valueForKeyPath: @\"transform.scale\"] floatValue];[详细]

2023-04-13 09:08 分类：问答
Cropping a UIImage according to the viewport inside a UIScrollView

I have a UIImageView (initialized with Aspect Fill) inside a UIScrollView. The user shall use that to resize and position a UIImage to his like, press a button and then exactly what he sees on screen[详细]

2023-04-12 17:13 分类：问答
Jaggy paths when blitting an offscreen CGLayer to the current context

In my current project I need to draw a complex background as a background for a few UITableView cells. Since the code for drawing this background is pretty long and CPU heavy when executed in the cell[详细]

2023-04-12 01:29 分类：问答
Core Graphics: How to draw overlapped semi transparent rectangle without changing color of the common area

When two semi-transparent overlaps, the part in the middle will combines and blends into a darker color. Is there any way to draw rect as usual, but keep the overlapped part sam开发者_如何学JAVAe colo[详细]

2023-04-11 23:05 分类：问答
Add image on top of UIImage

I am trying to add a image banner on top of a UIImage before saving it. I have created this category method to do so. I have checked a开发者_开发技巧nd rechecked that banner.png exists and the gradien[详细]

2023-04-11 19:42 分类：问答
Custom font does not render correctly when using ShowText

I have a custom view in which I am trying to draw text using a Windows font (calibri.ttf). However, I am getting different behaviour between using the DrawString & ShowText functions.[详细]

2023-04-11 07:39 分类：问答
Can I use CGDataProviderCreateSequential() to read in the data of a CGImageRef sequentially?

Is it possible to use CGDataProviderCreateSequential() and CGDataProviderSequential开发者_运维百科Callbacks to read the data in from a CGImageRef sequentially?[详细]

2023-04-11 05:00 分类：问答
Advantages of using Core Graphics

I would like to know what kind of advantages I get from using Core Graphics instead of Open GL ES. My main question is based on this:[详细]

2023-04-10 19:34 分类：问答
Any possible way to call drawRect from a UIViewcontroller class?

I have a UIViewController class called AppController.h, AppController.m. I have thousands of lines of code in there, and that is the only reason why I didn\'t test this before I asked it. Is there any[详细]

2023-04-10 15:41 分类：问答
What is the proper way to make it so core graphics does not lag?

I use UIBezierPath for finger painting (my app). I create it using path = [UIBezierPath bezier path]; . It constantly lags on the iPad (and calling it from within drawrect did not change anything). I[详细]

2023-04-10 07:55 分类：问答