cgpath

问题 i would like to animate a UIBezierPath of a rect to a triangle one, not to animate a view on a path but animate the path itself so it morphs from one shape to another. the path is added to a CALayer CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.fillColor = [[UIColor whiteColor] CGColor]; maskLayer.path = [self getRectPath]; -(CGPathRef)getTrianglePath { UIBezierPath* triangle = [UIBezierPath bezierPath]; [triangle moveToPoint:CGPointZero]; [triangle addLineToPoint:CGPointMake

问题 I wonder if there is a tool that could be used for easy generation of complex physics bodies in SpriteKit. I would like to have a volume based physical bodies with polygon-type shapes. SpriteKit allows to create such bodies with that method: + (SKPhysicsBody *)bodyWithPolygonFromPath:(CGPathRef)path Unfortunately it\'s time consuming task to generate such paths manually, and it could be problematic when testing. There is a SpriteHelper application that allows you to define body shape within

问题 Trying to create a CGMutablePath() as such: let path = CGMutablePath() CGPathMoveToPoint(path, nil, 30, 0) but the compiler keeps on giving me the following error: \'nil\' not compatible with expected argument type \'UnsafePointer<CGAffineTransform>\' . What am I doing wrong? I can\'t seem to find anything else online. (Yes I\'ve tried converting the Ints to CGFloats but it doesn\'t seem to make a difference.) 回答1: Try this: let path = CGMutablePath() path.move(to: CGPoint(x: 30, y: 0))