/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Demonstrates using Quartz to stroke  fill polygons (QuartzPolygonView).

 */

import UIKit

class QuartzPolygonView: QuartzView {

    var drawingMode: CGPathDrawingMode = .fill {

        didSet(prevDrawingMode) {

            if prevDrawingMode != drawingMode {

                setNeedsDisplay()

            }

        }

    }

    override func drawInContext(_ context: CGContext) {

        centerDrawing(inContext: context,  drawingExtent: CGRect(x:0.0, y:0.0, width:280.0, height:280.0))

        // Drawing lines with a white stroke color

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

        // And drawing with a blue fill color

        context.setFillColor(red: 0.0, green: 0.0, 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)

                    // Add a star to the current path

        var center = CGPoint(x: 90, y: 90)

        context.move(to: CGPoint(x: center.x, y: center.y + 60.0))

        for i in 1..<5 {

            let x = CGFloat(60.0 * sinf(Float(i) * 4.0 * Float.pi / 5.0))

            let y = CGFloat(60.0 * cosf(Float(i) * 4.0 * Float.pi / 5.0))

            context.addLine(to: CGPoint(x: center.x + x, y: center.y + y))

        }

        // And close the subpath.

        context.closePath()

        // Now add the hexagon to the current path

        center = CGPoint(x: 210, y: 90)

        context.move(to: CGPoint(x: center.x, y: center.y + 60.0))

        for i in 1..<6 {

            let x = CGFloat(60.0 * sinf(Float(i) * 2.0 * Float.pi / 6.0))

            let y = CGFloat(60.0 * cosf(Float(i) * 2.0 * Float.pi / 6.0))

            context.addLine(to: CGPoint(x: center.x + x, y: center.y + y))

        }

        // And close the subpath.

        context.closePath()

        // Now draw the star & hexagon with the current drawing mode.

        context.drawPath(using: drawingMode)

    }

}