drawrect

I have a customized OnTouch Method where i check if the touch coordinates contains a rectangle.After checking the condition i want to start a new Activity.But unfortuanlely its not workin.Can someone help me out? public class custom extends SurfaceView implements SurfaceHolder.Callback{ public boolean onTouchEvent(MotionEvent event) { int touchX = (int) event.getX(); int touchY = (int) event.getY(); switch(event.getAction()){ case MotionEvent.ACTION_DOWN: System.out.println("Touching down!"); for(int i =0; i< rectangles.size();i++){ if(rectangles.get(i).contains(touchX,touchY)){ System.out

Since we are talking about programmatically , Instruments are not under my consideration. Some reference listed in advance: Calculate fps (frames per second) for iphone app Display FPS on iOS onscreen (without Instruments) At what framerate does the iOS UI run animations at? 1. Using CADisplayLink According to the doc, The duration property provides the amount of time between frames. You can use this value in your application to calculate the frame rate of the display... So in my demo project, I add a displayLink to mainRunLoop for UITrackingRunLoopMode: self.displayLink = [CADisplayLink

Using Swift, I want to get the boundingRect of a glyph, in draw#rect in a UILabel, the UILabel already has a size (say 300x300 in the example) and qualities such as the text being centered. class RNDLabel: UILabel { override func draw(_ rect: CGRect) { let manager = NSLayoutManager() let store = NSTextStorage(attributedString: NSAttributedString( string: text!, attributes: [NSAttributedString.Key.font: font])) store.addLayoutManager(manager) let textContainer = NSTextContainer(size: rect.size) // note, intrinsicContentSize is identical there, no difference manager.addTextContainer

With the code below, I am successfully masking part of my drawing, but it's the inverse of what I want masked. This masks the inner portion of the drawing, where I would like to mask the outer portion. Is there a simple way to invert this mask? myPath below is a UIBezierPath . CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; CGMutablePathRef maskPath = CGPathCreateMutable(); CGPathAddPath(maskPath, nil, myPath.CGPath); [maskLayer setPath:maskPath]; CGPathRelease(maskPath); self.layer.mask = maskLayer; With even odd filling on the shape layer ( maskLayer.fillRule = kCAFillRuleEvenOdd; )

Not a graphics programmer here, so I'm trying to stumble through this. I'm trying to draw 9 filled circles, each a different color, each with a white border. The UIView's frame is CGRectMake (0,0,60,60). See attached image. The problem is I'm getting "flat spots" on the borders on each side. Following is my code (from the UIView subclass): - (void)drawRect:(CGRect)rect { CGRect borderRect = CGRectMake(0.0, 0.0, 60.0, 60.0); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0); CGContextSetRGBFillColor(context, colorRed, colorGreen,