cgcontext

The simple UIView below draws a rounded rectangle. When I pass a corner radius of 65 or below it rounds correctly, but 66 and above and it generates a perfect circle! What is going on here? It should only show a circle when the corner radius is equal to 1/2 the frame width, but it seems that it is drawing a circle when the radius is about 1/3rd, no matter what the size of the view is. This behavior appears on iOS 7. On iOS 6 I get expected behavior. #import "ViewController.h" @interface MyView : UIView @end @implementation MyView -(void)drawRect:(CGRect)rect { UIBezierPath *path =

I want to generate a pdf of UIScrollView whose content size is near about 320*2000. If I use current graphic image context to capture the scroll view layer, then it only captures the visible part of the scroll view not the whole layer of that scroll view. I am using the below code: -(void)CreatePdf:(id)sender { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *saveDirectory = [paths objectAtIndex:0]; NSString *saveFileName = @"myPDF.pdf"; [self writePDFAma]; CGRect arect=CGRectMake(0, 0, 768, 1024); CreatePDFFileAma(arect, nil); } -

I'm trying to save and restore a CGContext to avoid doing heavy drawing computations for a second time and I'm getting the error <Error>: CGGStackRestore: gstack underflow . What am I doing wrong? What is the correct way to do this? - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); if (initialized) { CGContextRestoreGState(context); //scale context return; } initialized = YES; //heavy drawing computation and drawing CGContextSaveGState(context); } Brad Larson I think you might be misinterpreting what CGContextSaveGState() and CGContextRestoreGState() do.

Anyone have any idea why CGContextFillPath won't work in the code snippet below? I'm using the following code to draw to a UIImageView. It's stroking the path correctly, but ignoring CGContextFillPath. UIGraphicsBeginImageContext(self.frame.size); [drawingView.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0); CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES); CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1

I am trying to erase image using following code CGColorRef strokeColor = [UIColor whiteColor].CGColor; UIGraphicsBeginImageContext(imgForeground.frame.size); CGContextRef context = UIGraphicsGetCurrentContext(); [imgForeground.image drawInRect:CGRectMake(0, 0, imgForeground.frame.size.width, imgForeground.frame.size.height)]; CGContextSetLineCap(context, kCGLineCapRound); CGContextSetLineWidth(context, 10); CGContextSetStrokeColorWithColor(context, strokeColor); CGContextSetBlendMode(context, kCGBlendModeClear); CGContextBeginPath(context); CGContextMoveToPoint(context, lastPoint.x, lastPoint

I want to create a CGImageRef and draw points to it. What context to use to create an empty CGImageRef and be able to draw onto it. CGContextRef or CGBitmapContextRef? If you can provide code to create an empty CGImageRef image and draw to it I would appreciate. #define HIRESDEVICE (((int)rintf([[[UIScreen mainScreen] currentMode] size].width/[[UIScreen mainScreen] bounds].size.width )>1)) - (CGImageRef) blerg { CGFloat imageScale = (CGFloat)1.0; CGFloat width = (CGFloat)180.0; CGFloat height = (CGFloat)180.0; if ( HIRESDEVICE ) { imageScale = (CGFloat)2.0; } // Create a bitmap graphics