core-graphics

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Quantize Image, Save List of Remaining Colors

Is there a library I can use that will allow me t开发者_运维技巧o quantize images on an iPhone?[详细]

2023-04-05 18:05 分类：问答
How can I generate file preview thumbnails in my desktop application?

I am developing a sort of file browser on the Mac, and I\'m not sure how I can dynamically generate thumbnail previews of files. I would like to do this not just for images开发者_如何学JAVA, but for c[详细]

2023-04-05 12:16 分类：问答
Using only part of CGAffineTransformIdentity

Is there any way to only use certain aspects of the transform identity when I\'m resetting something to its CGAffineTransformIdentity?[详细]

2023-04-04 13:11 分类：问答
Drawing a line with a shadow, but only want to keep shadow. IOS

I am trying to draw a line with a shadow but I do not want to keep the line but only the shadow. I have attempted to set the stroke color of the line to clear but when I do that the shadow also disa[详细]

2023-04-04 03:11 分类：问答
In CoreGraphics drawing how can I keep the point of overlap from being darker than the rest of the line?

My app uses core graphics for custom finger paint drawing. I allow the user to change the alpha of the line and a new line is continuously drawn on touches moved. When I make the alpha lower than 1.0[详细]

2023-04-03 16:25 分类：问答
Applying transformed image layer to renderInContext:

Background I am using Erica Saduns Cookbook example from Chapter 8, Example 14 — Resize and Rotate to obviously resize and rotate a UIImageView.[详细]

2023-04-03 13:26 分类：问答
How to draw underline to a multiline label without using CoreText?

I have been trying to underline a multiline label but I am not able to do that. I have referred to this link but this doesn开发者_开发问答\'t seem to help me.[详细]

2023-04-03 12:50 分类：问答
How do I draw an angle gradient using CALayer or CoreGraphics functions? [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: CGContextDrawAngleGradient?[详细]

2023-04-03 10:09 分类：问答
To clear a line in iPhone

I need to clear the current line graph and replace it with a new line graph, as and when I change the month (The createLineGraph method is called each time I change the month). What happens is that, p[详细]

2023-04-02 12:06 分类：问答
iPhone - Image drawn upside down into a CGGraphic context (custom UIView)

I have a custom view with that code : - (void)drawRect:(CGRect)rect { UIImage* theImage = [UIImage imageNamed:@\"blue_arrow\"];[详细]

2023-04-02 03:47 分类：问答