Intro to C4 – Snippets: 02/27/2016

[travis]

For today's workshop, post your snippets here!

[travis]

override func setup() {
    house()
}

func house() {
    let p = Path()
    p.moveToPoint(Point(2,3))
    p.addLineToPoint(Point(0,1))
    p.addLineToPoint(Point(2,1))
    p.addLineToPoint(Point(0,3))
    p.addLineToPoint(Point(0,1))
    p.addLineToPoint(Point(1,0))
    p.addLineToPoint(Point(2,1))
    p.addLineToPoint(Point(2,3))
    p.addLineToPoint(Point(0,3))

    p.transform(Transform.makeScale(100, 100))

    let shape = Shape(p)
    shape.fillColor = clear
    shape.center = canvas.center
    shape.strokeEnd = 0.0
    canvas.add(shape)

    let a = ViewAnimation(duration: 1.0) {
        shape.strokeEnd = 1.0
    }

    a.delay = 0.5
    a.animate()
}

[travis]

canvas.addPanGestureRecognizer { (locations, translation, velocity, state) -> () in
    print(locations)
}

And...

internal class PanGestureHandler: NSObject {
    let action: PanAction
        init(_ action: PanAction) {
        self.action = action
    }
        func handleGesture(gestureRecognizer: UIPanGestureRecognizer) {

            var locations = [Point]()
            for i in 0..<gestureRecognizer.numberOfTouches() {
                let p = Point(gestureRecognizer.locationOfTouch(i, inView: gestureRecognizer.referenceView))
                locations.append(p)
            }
            action(locations: locations, translation: gestureRecognizer.translation, velocity: gestureRecognizer.velocity, state: gestureRecognizer.state)
    }
}

And...

public typealias PanAction = (locations: [Point], translation: Vector, velocity: Vector, state: UIGestureRecognizerState) -> ()