Wave Path

DWAnimator.swift

let originY = (label.bounds.size.height + label.font.lineHeight) / 2
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: _waveHeight!))
var yPosition = 0.0
for xPosition in 0..<Int(label.bounds.size.width) {
    yPosition = _zoom! * sin(Double(xPosition) / 180.0 * Double.pi - 4 * _translate! / Double.pi) * 5 + _waveHeight!
    path.addLine(to: CGPoint(x: Double(xPosition), y: yPosition))
}
path.addLine(to: CGPoint(x: label.bounds.size.width, y: originY))
path.addLine(to: CGPoint(x: 0, y: originY))
path.addLine(to: CGPoint(x: 0, y: _waveHeight!))
path.close()