uibezierpath

问题 Given an arbitrary UIBezierPath , I'm looking for a way to get a point at a fraction of the length of that path. Example: UIBezierPath *path = [UIBezierPath bezierPath]; [path moveToPoint:CGPointMake(200.0, 200.0)]; [path addLineToPoint:CGPointMake(200.0, 400.0)]; CGPoint p = [path pointAtFraction:0.5]; p should be {x: 200.0, y: 300.0} in this case. I'm aware that this simple example could be calculated, but I'm looking for a solution that fits ANY UIBezierPath (arcs, rounded rects, etc.)

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'm trying to clip a UIImage based on a given UIBezierPath , but the resulting image retains the original shape and size. I want the shape and size to resemble the path, i.e. the visible content of the new image. Take a look at this following example: The following is the code I am using to mask an image given a path: func imageByApplyingClippingBezierPath(_ path: UIBezierPath) -> UIImage { UIGraphicsBeginImageContextWithOptions(CGSize( width: size.width, height: size.height ), false, 0.0)

问题 I am developing one application same as HairTryOn all things are done. but problem is display in following image. i want to set hair style as per customer face using blue line as per display in image. i used the following code testVw = [[UIView alloc]initWithFrame:CGRectMake(100,100, 100, 100)]; testVw.backgroundColor = [UIColor clearColor]; [self.view addSubview:testVw]; resizeVw = [[UIImageView alloc]initWithFrame:CGRectMake(testVw.frame.size.width-25, testVw.frame.size.height-25, 25, 25)];

问题 I'm new to iOS , i am trying to develop a freehand drawing app, using uibezierPath .is there a way to calculate or receive the total line length, even if i drew straight line, curved or a circle. i am using addline on the the touchmove method, and i don't have any control points. 回答1: Inside your touchesBegan method, you can use this code { UITouch * touch = [touches anyObject]; CGPoint present = [touch locationInView:self]; CGPoint previous = [touch previousLocationInView:self]; CGFloat

问题 I need to programmatically draw something like this:- (source: planetclegg.com) Except that my UIBezierPath is closed & I need the text to fit inside it while following the curve. I have my path drawing correctly, the problem is the text. I've searched the 'net and read a bunch of tutorials but nothing seems to provide a solution. Is this possible in iOS, and if so how is it done? Links to relevant tutorials and/or code snippets would be much appreciated. 回答1: You can see the sample code in

问题 In one of my application, I am trying to draw a gradient arc with rounded edges. Like the following image. This is what I have done so far using the following code. -(void)startArc { UIBezierPath *roundedArc = [self arcWithRoundedCornerAt:centerPoint startAngle:DEGREES_TO_RADIANS(-90) endAngle:DEGREES_TO_RADIANS(90) innerRadius:width-20 outerRadius:width cornerRadius:0]; CAShapeLayer *mask = [CAShapeLayer new]; [mask setPath:roundedArc.CGPath]; [mask setFrame:_outerView.bounds]; [mask

问题 My purpose : Draw outline of every glyph example1: input: text= "666棒" display: Attach ：In the figure above, 1 is displayView,2 is inputView. example2: input : text= "666😁棒" display : Attach： In the figure above, 1 is displayView,2 is inputView,3 is nothing rendered. Main ideas is : Use CoreText obtained every CGglyph. Get every glyph's CGPath Use CAShapeLayer display the glyph on screen. Main method: let letters = CGMutablePath() let font = CTFontCreateWithName(fontName as CFString?,

问题 I'm trying to implement the next curious thing: I have a few dots and I'd like to link them with sine waves Next method returns the array of dots for making plot: - (NSArray *)plotPointsBetweenPoint:(CGPoint)pointA andPoint:(CGPoint)pointB { double H = fabs(pointB.y - pointA.y); double L = fabs(pointB.x - pointA.x); NSInteger granularity = 40; NSMutableArray *array = [NSMutableArray arrayWithCapacity:granularity + 1]; for (int i = 0; i <= granularity; ++i) { CGFloat x = M_PI*(float)i/

问题 I'm getting a clipped LineJoin in a UIBezierPath when one line comes back exactly over the previous line. If I adjust the second line by one pixel, the LineJoin behaves as expected. Here's the code: UIBezierPath *path = [UIBezierPath bezierPath]; [path setLineWidth:10.0f]; [path setLineCapStyle:kCGLineCapRound]; [path setLineJoinStyle:kCGLineJoinRound]; [path moveToPoint:CGPointMake(100, 100)]; [path addLineToPoint:CGPointMake(200, 100)]; [path addLineToPoint:CGPointMake(150, 100)]; [path