/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Demonstrates Quartz line drawing facilities

 */

import UIKit

class QuartzLineView: QuartzView {

    override func drawInContext(_ context: CGContext) {

        centerDrawing(inContext: context,  drawingExtent: CGRect(x:0.0, y:0.0, width:320.0, height:160.0))

        // 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 single line from left to right

        context.move(to: CGPoint(x: 10.0, y: 30.0))

        context.addLine(to: CGPoint(x: 310.0, y: 30.0))

        context.strokePath()

        // Draw a connected sequence of line segments

        let addLines = [

            CGPoint(x: 10.0, y: 90.0),

            CGPoint(x: 70.0, y: 60.0),

            CGPoint(x: 130.0, y: 90.0),

            CGPoint(x: 190.0, y: 60.0),

            CGPoint(x: 250.0, y: 90.0),

            CGPoint(x: 310.0, y: 60.0)

        ]

        // Bulk call to add lines to the current path.

        // Equivalent to:

        //     context.move(to: addLines[0])

        //     for i in 1..<addLines.count {

        //         context.addLine(to: addLines[i+1])

        //     }

        context.addLines(between: addLines)

        context.strokePath()

        // Draw a series of line segments. Each pair of points is a segment

        let strokeSegments = [

            CGPoint(x: 10.0, y: 150.0),

            CGPoint(x: 70.0, y: 120.0),

            CGPoint(x: 130.0, y: 150.0),

            CGPoint(x: 190.0, y: 120.0),

            CGPoint(x: 250.0, y: 150.0),

            CGPoint(x: 310.0, y: 120.0)

        ]

        // Bulk call to stroke a sequence of line segments.

        // Equivalent to:

        //     context.addLines(between: strokeSegments)

        //     context.strokePath()

        context.strokeLineSegments(between: strokeSegments)

    }

}