//  DrawingDemoView.swift  Copyright (c) 2015 Kari Laitinen. All rights reserved.


//  2015-08-18 File created.
//  2015-10-17 Modifications for Xcode 7, Swift 2
//  2016-08-11 Last modification.



/* This program demonstrates some basic drawing operations.

*/

import UIKit

class DrawingDemoView: UIView {

   override func drawRect( rect: CGRect )
   {
      let context: CGContextRef = UIGraphicsGetCurrentContext()!
      
      let view_width = self.bounds.size.width
      let view_height = self.bounds.size.height
      
      let text_to_draw = String( format: "View size is %.0f x %.0f", view_width, view_height )
      
      let text_color: UIColor = UIColor.blackColor()
      
      // set the font to Palatino-Roman 14
      let font = UIFont( name: "Palatino-Roman", size:14.0)
      
      // set the line spacing to 6
      let paragraph_style = NSMutableParagraphStyle()
      paragraph_style.lineSpacing = 6.0
      
      // set the Obliqueness to 0.1
      let skew = 0.0
      
      let text_attributes: NSDictionary = [
         NSForegroundColorAttributeName: text_color,
         NSParagraphStyleAttributeName: paragraph_style,
         NSObliquenessAttributeName: skew,
         NSFontAttributeName: font!
      ]
      
      ( text_to_draw as NSString ).drawAtPoint( CGPointMake( 20.0, 40.0 ),
              withAttributes: text_attributes as? [String : AnyObject])
      
      // The next two lines specify that we'll be stroking with
      // green color and making lines that are two pixels wide.
      CGContextSetLineWidth( context, 2.0 )
      CGContextSetStrokeColorWithColor( context, UIColor.greenColor().CGColor )

      // Next we specify a drawing path for a horizontalline
      CGContextBeginPath( context )
      CGContextMoveToPoint( context, view_width / 2 - 120, view_height / 8 )
      CGContextAddLineToPoint( context, view_width / 2 + 120, view_height / 8 )
      CGContextStrokePath( context ) // This draws the line
      
      // Next we'll make a rectangle that is filled with cyan color.
      CGContextBeginPath( context )
      CGContextSetFillColorWithColor(context, UIColor.cyanColor().CGColor )

      let cyan_rectangle = CGRectMake( view_width / 2 - 80,
                                       view_height / 4 - 50, 160, 80 )
      CGContextAddRect( context, cyan_rectangle )
      CGContextFillPath( context )
      
      // Let's start using blue as stroke color
      CGContextSetStrokeColorWithColor( context, UIColor.blueColor().CGColor )
      
      // The following statement creates a stroked rectangle around the
      // cyan rectangle.
      CGContextStrokeRect( context, CGRectMake( view_width / 2 - 90,
                                                view_height / 4 - 60, 180, 100 ) )
      
      // Next we'll draw a magenta 'ball' to the center of the view
      
      CGContextBeginPath( context )
      CGContextSetFillColorWithColor( context, UIColor.magentaColor().CGColor )
      
      let centered_square = CGRectMake( view_width / 2 - 80,
                                        view_height / 2 - 80, 160, 160 )
      CGContextAddEllipseInRect( context, centered_square )
      // The following call both fills and strokes the path with selected colors.
      CGContextDrawPath( context, CGPathDrawingMode.FillStroke)

      // Let's change the colors for filling and stroking.
      CGContextSetFillColorWithColor( context,
                                      UIColor.yellowColor().CGColor )
      CGContextSetStrokeColorWithColor( context, UIColor.blackColor().CGColor )

      CGContextSetLineWidth( context, 4.0 ) // Somewhat wider lines.
      
      // The following lines create a Pacman shape
      CGContextBeginPath( context )
      CGContextMoveToPoint( context, view_width / 2 - 40,
         view_height / 5 * 4 ) // start from center
      CGContextAddArc(context, view_width / 2 - 40, // center point x
                      view_height / 5 * 4,     // center point y
                      80,                      // radius of the arc
                      CGFloat( 0.25 * M_PI),   // start angle in radians
                      CGFloat( 1.75 * M_PI ),  // end angle in radians
                      0 )                      // create a counterclockwise arc
      CGContextClosePath( context )
      CGContextDrawPath( context, CGPathDrawingMode.FillStroke)
      
      // Next we'll draw the 'missing pie' of the pacman.
      // The center point is now 80 points to the right of the center point
      // of the pacman. When the last parameter for the CGContextAddArc
      // function is 1, we'll make a clockwise arc.
      CGContextBeginPath( context )
      CGContextMoveToPoint( context, view_width / 2 + 40,
         view_height / 5 * 4 ) // start from center
      CGContextAddArc(context, view_width / 2 + 40,
         view_height / 5 * 4, 80,
         CGFloat( 0.25 * M_PI), CGFloat( 1.75 * M_PI ), 1 )
      CGContextClosePath( context )
      CGContextDrawPath( context, CGPathDrawingMode.FillStroke )
      
   }
}