53 lines
1.3 KiB
Swift
53 lines
1.3 KiB
Swift
extension CGFloat {
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func degrees_to_radians() -> CGFloat {
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return CGFloat(M_PI) * self / 180.0
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}
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}
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extension Double {
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func degrees_to_radians() -> Double {
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return Double(M_PI) * self / 180.0
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}
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}
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class Tree: UIView {
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func drawTree(x1: CGFloat, y1: CGFloat, angle: CGFloat, depth:Int){
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if depth == 0 {
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return
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}
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let ang = angle.degrees_to_radians()
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let x2:CGFloat = x1 + ( cos(ang) as CGFloat) * CGFloat(depth) * (self.frame.width / 60)
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let y2:CGFloat = y1 + ( sin(ang) as CGFloat) * CGFloat(depth) * (self.frame.width / 60)
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let line = drawLine(x1, y1: y1, x2: x2, y2: y2)
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line.stroke()
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drawTree(x2, y1: y2, angle: angle - 20, depth: depth - 1)
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drawTree(x2, y1: y2, angle: angle + 20, depth: depth - 1)
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}
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func drawLine(x1:CGFloat, y1:CGFloat, x2:CGFloat, y2:CGFloat) -> UIBezierPath
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{
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let path = UIBezierPath()
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path.moveToPoint(CGPoint(x: x1,y: y1))
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path.addLineToPoint(CGPoint(x: x2,y: y2))
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path.lineWidth = 1
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return path
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}
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override func drawRect(rect: CGRect) {
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let color = UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)
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color.set()
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drawTree(self.frame.width / 2 , y1: self.frame.height * 0.8, angle: -90 , depth: 9 )
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}
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}
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let tree = Tree(frame: CGRectMake(0, 0, 300, 300))
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tree
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