cgcontext

I have this kind of code in a swift app and I get an extra greyed line reaching the starting point of the arc. The arc itself is drawn as expected, but it seems like CGContextMoveToPoint is leaving some trace behind before reaching the starting point. override func drawRect(rect: CGRect) { var context:CGContextRef = UIGraphicsGetCurrentContext(); var centerX,centerY,startAngle,endAngle,radius:CGFloat startAngle = CGFloat(M_PI_4) endAngle = -startAngle radius = (rect.height/2) / sin(startAngle) centerX = rect.width/2 + (radius*cos(startAngle)) centerY = rect.height/2 CGContextMoveToPoint

I have an "ImageManipulator" class that performs some cropping, resizing and rotating of camera images on the iPhone. At the moment, everything works as expected but I keep getting a few huge spikes in memory consumption which occasionally cause the app to crash. I have managed to isolate the problem to a part of the code where I check for the current image orientation property and rotate it accordingly to UIImageOrientationUp . I then get the image from the bitmap context and save it to disk. This is currently what I am doing: CGAffineTransform transform = CGAffineTransformIdentity; // Check

I am doing some custom download progresses bar in side the (subclassed) UIButton (or) i can also do that in UIView , every thing is fine, now i want change the colour of the title as the progress the proceeds, for example as u can see in the below image shows what is now i am getting, what i want is like below image i want change the color of the title to white or some other color as download proceeds, is there any way i can do, any sample code for this. i am achieving this by using below code - (void)drawInContext:(CGContextRef)progressContext { CGContextSetFillColorWithColor(progressContext,

My big picture goal is to have a grey field over an image, and then as the user rubs on that grey field, it reveals the image underneath. Basically like a lottery scratcher card. I've done a bunch of searching through the docs, as well as this site, but can't find the solution. The following is just a proof of concept to test "erasing" an image based on where the user touches, but it isn't working. :( I have a UIView that detects touches, then sends the coords of the move to the UIViewController that clips the image in a UIImageView by doing the following: - (void) moveDetectedFrom:(CGPoint)

I wrote the following code in ViewDidLoad // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. -(void)viewDidLoad { [super viewDidLoad]; NSString *str = [NSString stringWithFormat:@"Veer"]; CGColorSpaceRef rgbColorspace = CGColorSpaceCreateDeviceRGB(); CGFloat values[4] = {55.0, 0.0, 0.0, 1.0}; CGColorRef glowColor = CGColorCreate(rgbColorspace, values); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetShadowWithColor( context, CGSizeMake( 5.0, 0.0 ), 20.0f, glowColor); [str drawAtPoint:CGPointMake(10.5f, 0.5f) withFont:[UIFont

is there an easy way to not draw this points in my lines? I don't know why this points are there because i never release my finger from screen during drawing of a line. I got the code from a drawing example. // draw a line - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = YES; UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self.view]; currentPoint.y -= 0; // 20 only for 'kCGLineCapRound' UIGraphicsBeginImageContext(self.view.frame.size); //Albert Renshaw - Apps4Life [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame

In my app I'm trying to render text along a path; this is fine for most characters but not for Japanese (or anything non mac-Roman). I've been advised to use [NSString drawAtPoint] which displays the correct characters in my CATiledLayer; however, they dissapear after approximately 5 seconds. In this time I can zoom the layer and they scale properly, but they don't seem to get committed to the CATiledLayer like the rest of the text usually is. Before I render, I check the string and decide whether any of them will not be renderable. If I'm going to have issues, I use drawAtpoint instead: if (