core-graphics

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Any possible way for CoreGraphics to not lag when drawrect is being called from touches moved?

I am calling setNeedsDisplay from touches moved (and have also tried not calling from touches moved, but instead from a 0.05 timer) and the drawrect method is always laggy. Is their anyway to change t[详细]

2023-04-10 06:35 分类：问答
Getting the average RGB color of a CGImageRef in iOS

I\'ve been struggling with this for a couple of hours, and I\'m hoping someone else has some insight. I\'m looking for a way to get the average RGB color of a 1x1 UIImage. So far I\'ve created a CGIma[详细]

2023-04-10 04:52 分类：问答
Fastest possible Apple Style Flip Counter in native code on iOS

I\'d like to mimic an Apple style flip counter on iOS. Specifically, this thing is going to be FLYING FAST.It\'s not going to be an alarm clock, think player high-score where you are racking up point[详细]

2023-04-10 00:50 分类：问答
Draw triangle cutout for selection indication in UIView

I\'m creating a view that serves as a category selector for my app. I\'d like it to have a cutout triangle as the selection indication, as in this image:[详细]

2023-04-09 18:38 分类：问答
iphone Drawing gradient inside a polygon

I want to draw a gradient inside a polygon using core graphics. I am able to draw a hexagon using the code below but i don\'t know how to fill this hexagon with a gradient color. Any help will be real[详细]

2023-04-09 05:22 分类：问答
Confused about UIBezierPath + applyTransform + CGPath

I scale UIBezierPath (built of one [0,0 - 1x1] rect) by factor 2 in both x and y directions. UIBezierPath \".bounds\" is alright (i.e. scaled as expected), while \".CGPath\" remains unchanged...[详细]

2023-04-08 10:49 分类：问答
Coregraphics causing big lag on iPad?

UIGraphicsBeginImageContext(self.view.bounds.size); [currentStrokeImageView.image drawInRect:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];[详细]

2023-04-08 09:11 分类：问答
CGPathRef and PDF

It there a way to draw a complex shape with an application like CorelDraw or Adobe Flash, etc, save it or export it as a PDF and then open it with Core Graphics in iOS.[详细]

2023-04-08 05:37 分类：问答
iOS - Change color channels levels programmatically

Is it possible to adjust color levels using Core Graphics? I would like to adjust channels using parametrized curves in the Gimp or other grap开发者_Python百科hic editor style.You can use this: ios-i[详细]

2023-04-07 16:52 分类：问答
Remove layer from renderInContext

I use this code to make a screenshot, CGFloat breed = 768; CGFloat hoogte = 975; CGSize afmeting = CGSizeMake(breed, hoogte);[详细]

2023-04-07 16:37 分类：问答