/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Demonstrates using Quartz to draw bezier  quadratic curves.

 */

import UIKit

class QuartzBezierView: QuartzView {

    override func drawInContext(_ context: CGContext) {

        centerDrawing(inContext: context,  drawingExtent: CGRect(x:0.0, y:0.0, width:320.0, height:300.0))

        // Drawing lines with a white stroke color

        context.setStrokeColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)

        // Draw them with a 2.0 stroke width so they are a bit more visible.

        context.setLineWidth(2.0)

        // Draw a bezier curve with end points s,e and control points cp1,cp2

        var s = CGPoint(x: 30.0, y: 120.0)

        var e = CGPoint(x: 300.0, y: 120.0)

        var cp1 = CGPoint(x: 120.0, y: 30.0)

        let cp2 = CGPoint(x: 210.0, y: 210.0)

        context.move(to: s)

        context.addCurve(to: cp1, control1: cp2, control2: e)

        context.strokePath()

        // Show the control points.

        context.setStrokeColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)

        context.move(to: s)

        context.addLine(to: cp1)

        context.move(to: e)

        context.addLine(to: cp2)

        context.strokePath()

        // Draw a quad curve with end points s,e and control point cp1

        context.setStrokeColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)

        s = CGPoint(x: 30.0, y: 300.0)

        e = CGPoint(x: 270.0, y: 300.0)

        cp1 = CGPoint(x: 150.0, y: 180.0)

        context.move(to: s)

        context.addQuadCurve(to: cp1, control: e)

        context.strokePath()

        // Show the control point.

        context.setStrokeColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)

        context.move(to: s)

        context.addLine(to: cp1)

        context.strokePath()

    }

}