continue line

[dcooley]

I've updated the touchesBegan function in my forked repo to experiment adding a 'continue path' functionality, where the line you draw will automatically continue from the last one you did (if it exists)

Is something like this worth adding into the library?

---

The updated touchesBegan() looks like

    /// Determines whether the path should continue from the last touch point.
    public var shouldContinuePath = false


    override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard isEnabled, let touch = touches.first else { return }
        if #available(iOS 9.1, *) {
            guard allowedTouchTypes.flatMap({ $0.uiTouchTypes }).contains(touch.type) else { return }
        }
        guard delegate?.swiftyDraw(shouldBeginDrawingIn: self, using: touch) ?? true else { return }
        delegate?.swiftyDraw(didBeginDrawingIn: self, using: touch)
        
        firstPoint = shouldContinuePath && previousPoint != .zero ? previousPoint : touch.location(in: self)
        setTouchPoints(touch, view: self)
          
        let newLine = DrawItem(path: CGMutablePath(),
                           brush: Brush(color: brush.color.uiColor, width: brush.width, opacity: brush.opacity, blendMode: brush.blendMode), isFillPath: false)
        if shouldContinuePath && currentPoint != .zero {
            // draw a straight line between the end of the last touch point
            // and this new touch point
            newLine.path.addPath(createNewStraightPath())
        }
        addLine(newLine)
    }