cgpath

问题 I am trying to draw a CGPath that has a stroke for it's stroke. Basically I want a draw a line using CGPath. I then want to go back and draw lines on both sides of the last CGPath giving it the effect that it is outlines. This line can bend and turn in any way but I always need the two lines on the outside to follow. EDIT: I need to be able to make the middle of the line transparent but the outlines solid black. 回答1: Use CGPathCreateCopyByStrokingPath to create a new path by stroking your old

问题 In SpriteKit, the clockwise direction is reversed for UIBezierPath but not for CGPath . For example, if I have do { let path = CGPathCreateMutable() CGPathAddArc(path, nil, 0, 0, 10, 0, CGFloat(M_PI_2), true) let node = SKShapeNode(path: path) node.position = CGPoint(x: self.size.width/2, y: self.size.height/2) self.addChild(node) } do { let path = UIBezierPath() path.addArcWithCenter(CGPoint(x: 0, y: 0), radius: 10, startAngle: 0, endAngle: CGFloat(M_PI_2), clockwise: true) let node =

问题 I have a UICollectionViewCell subclass and I need to round its corners and add a shadow as well. The cell looks like a square card, and the cells have a good amount of space in-between them. So "underneath" every cell, I would like to add some shadow. I can successfully do this, but then my cell only has rounded corners on the bottom. The top just has normal corners. I need rounded corners for all four corners. I have found solutions on here for UIViews that recommend adding a separate UIView

问题 I have a problem in an app I'm working on. Say I have two CGPaths that are fairly complex and I add them both to a CGMutablePath (thus combining them). Well, where the two paths intersect there will be points inside of each other. I want to eliminate those inside points and essentially draw the outside or outline of the path. I am having difficulty figuring out how I would go about this. Edit: Here's an example of what I am talking about. The blue and red boxes represent points along the

问题 Through help and suggestions, I created a path for my sprite so that only the non-transparent parts can be touched. This is the path I came up with: path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, endTouch.x, endTouch.y); CGPathAddLineToPoint(path, NULL, 0, 250); CGPathAddLineToPoint(path, NULL, 30, 0); CGPathCloseSubpath(path); This works for all my other classes except for one. No matter where I tap, xcode keeps printing "outside" using this code: for(int i = 0; i < [sprArray

问题 I have a UIBezierPath stroke, now I want to get the stroke's outline path(not the stroke's path itself), is there a way I could get that? or at least NSLog the UIBezierPath stroke's outline path? Thanks 回答1: You can use CGPathCreateCopyByStrokingPath for this. UIBezierPath *path = ...; CGFloat lineWidth = 10; CGPathRef cgStrokedPath = CGPathCreateCopyByStrokingPath(path.CGPath, NULL, lineWidth, kCGLineCapRound, kCGLineJoinRound, 0); UIBezierPath *strokedPath = [UIBezierPath

问题 Hej fellows, I'm currently trying to convert a letter and/or multiple of them to a CGPathRef for manually drawing them into a custom UIView. I tried the way over CoreText and Framesetters including this little snippet but it doesn't seem to work.... NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:content attributes:nil]; // now for the actual drawing CGContextRef context = UIGraphicsGetCurrentContext(); // flip the coordinate system // draw CTFramesetterRef

问题 I am working on CAShapeLayer .And trying to draw non-linear path.I want to set frame to CAShapeLayer .So i can use CGPathGetPathBoundingBox method to get frame from CGPathRef . Here is code : CGMutablePathRef path = CGPathCreateMutable(); CGPathAddArc(path, NULL, rect.size.width/2, rect.size.height/2, 100, (0), (M_PI_2), NO); CGPathAddArc(path, NULL, rect.size.width/2, rect.size.height/2, 100-50, (M_PI_2), (0), YES); CGPathCloseSubpath(path); CAShapeLayer* arcLayer = [[CAShapeLayer alloc]init

问题 I need to know how I can scale down or up CGPath so it can fit UIView? Set the background color to yellow, To see the view clearly self.frame = CGRectMake(0, 0, 181, 154); self.backgroundColor = [UIColor yellowColor]; Draw CAShapeLayer CAShapeLayer *shape = [CAShapeLayer layer]; shape.path = aPath; shape.strokeColor = [[UIColor blueColor] CGColor]; shape.lineWidth = 5; shape.fillColor = [[UIColor clearColor] CGColor]; [self.layer addSublayer:shape]; Then I get This: What I want is this: Thank

问题 I'm writing an audio waveform editor in Cocoa with a wide range of zoom options. At its widest, it shows a waveform for an entire song (~10 million samples in view). At its narrowest, it shows a pixel accurate representation of the sound wave (~1 thousand samples in a view). I want to be able to smoothly transition between these zoom levels. Some commercial editors like Ableton Live seem to do this in a very inexpensive fashion. My current implementation satisfies my desired zoom range, but