Objective c 绘制移动正弦波消除混叠

我想画一个移动的正弦波，以清晰和抗锯齿的方式，具有可变频率和可变振幅。这怎么可能呢？

好吧，我在UIView drawrect方法中实现了正弦波，如下所示：

 float x=75;
 float yc=50;
 float w=0; 
  while (w<=rect.frame.size.width) {
    CGPathMoveToPoint(path, nil, w,y/2);
    CGPathAddQuadCurveToPoint(path, nil, w+x/4, -yc,w+ x/2, y/2);
    CGPathMoveToPoint(path, nil, w+x/2,y/2);
    CGPathAddQuadCurveToPoint(path, nil, w+3*x/4, y+yc, w+x, y/2);
    CGContextAddPath(context, path);
    CGContextDrawPath(context, kCGPathStroke);
    w+=x;
   }

float x=75；
浮动yc=50；
浮点数w=0；
而（w则是GeneratorOfOne版本的一个更完整、更快速的版本。这一版本还用所选的颜色填充了波浪底部：

class WaveView: UIView {

    private var maskPath: UIBezierPath!
    @IBInspectable var fillColor: UIColor = UIColor.blueColor()
    @IBInspectable var cycles: CGFloat = 7

    override func drawRect(rect: CGRect) {

        var w: CGFloat = 0              // Starting position
        let width = rect.width
        let y: CGFloat = rect.height
        let yc: CGFloat = rect.height / 2
        let x = width/cycles

        let context = UIGraphicsGetCurrentContext();
        CGContextSetFillColorWithColor(context, UIColor.greenColor().CGColor);
        let path = CGPathCreateMutable();

        CGPathMoveToPoint(path, nil, 0, 0)

        while (w<=rect.width) {
            CGPathMoveToPoint(path, nil, w,y/2);
            CGPathAddQuadCurveToPoint(path, nil, w+x/4, -yc, (w+x/2), y/2);
            CGPathMoveToPoint(path, nil, w+x/2,y/2);
            CGPathAddQuadCurveToPoint(path, nil, w+3*x/4, y+yc, w+x, y/2);
            w+=x;
        }

        CGPathAddLineToPoint(path, nil, rect.width, rect.height)
        CGPathAddLineToPoint(path, nil, 0, rect.height)
        CGPathAddLineToPoint(path, nil, 0, y/2);
        CGPathCloseSubpath(path)

        maskPath = UIBezierPath(CGPath: path)
        maskPath.lineCapStyle = CGLineCap.Square
        maskPath.lineJoinStyle = CGLineJoin.Miter

        CGContextAddPath(context, path);
        CGContextSetFillColorWithColor(context, fillColor.CGColor)
        CGContextFillPath(context)
    }

}

类WaveView:UIView{
私有var maskPath:UIBezierPath！
@IBInspectable变量fillColor:UIColor=UIColor.blueColor（）
@IBInspectable var cycles:CGFloat=7
重写func drawRect（rect:CGRect）{
变量w:CGFloat=0//起始位置
let width=rect.width
设y:CGFloat=rect.height
设yc:CGFloat=rect.height/2
设x=宽度/周期
让context=UIGraphicsGetCurrentContext（）；
CGContextSetFillColorWithColor（上下文，UIColor.greenColor（）.CGColor）；
让path=CGPathCreateMutable（）；
CGPathMoveToPoint（路径，零，0，0）
而（wIt）不是正弦波