//

//  GSProgressView.h

//

//  Created by Simon Whitaker on 14/11/2012.

//  Copyright (c) 2012 Goo Software Ltd. All rights reserved.

//

#import <UIKit/UIKit.h>

@interface GSProgressView : UIView

@property (nonatomic) CGFloat progress;

@property (strong, nonatomic) UIColor *color UI_APPEARANCE_SELECTOR;

@property (strong, nonatomic) UIColor *tickColor UI_APPEARANCE_SELECTOR;

@end

//

//  GSProgressView.m

//

//  Created by Simon Whitaker on 14/11/2012.

//  Copyright (c) 2012 Goo Software Ltd. All rights reserved.

//

#import "GSProgressView.h"

#import <QuartzCore/QuartzCore.h>

@implementation GSProgressView

- (void)commonInit {

    self.backgroundColor = [UIColor clearColor];

}

- (id)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];

    if (self) {

        [self commonInit];

    }

    return self;

}

- (id)initWithCoder:(NSCoder *)aDecoder {

    self = [super initWithCoder:aDecoder];

    if (self) {

        [self commonInit];

    }

    return self;

}

- (void)setProgress:(CGFloat)progress {

    if (progress > 1.0) progress = 1.0;

    if (progress != _progress) {

        _progress = progress;

        [self setNeedsDisplay];

    }

}

- (void)drawRect:(CGRect)rect {

    if ([self color] == nil)

        [self setColor:[UIColor blackColor]];

    CGPoint center = CGPointMake(rect.size.width/, rect.size.height/);

    CGFloat radius = MIN(rect.size.width, rect.size.height)/;

    // Start a path

    UIBezierPath *path = [UIBezierPath bezierPath];

    // Move to centre and draw an arc.

    [path moveToPoint:center];

    [path addArcWithCenter:center

                    radius:radius

                startAngle: - M_PI_2 // zero degrees is east, not north, so subtract pi/2

                  endAngle: * M_PI * [self progress] - M_PI_2 // ditto

                 clockwise:YES];

    [path closePath];

    // If progress is 1.0, show a tick mark in the centre of the circle

    if ([self progress] == 1.0) {

        /*

         First draw a tick that looks like this:

           A---F

           |   |

           |   E-------D

           |           |

           B-----------C

         (Remember: (0,0) is top left)

         */

        UIBezierPath *tickPath = [UIBezierPath bezierPath];

        CGFloat tickWidth = radius/;

        [tickPath moveToPoint:CGPointMake(, )];                            // A

        [tickPath addLineToPoint:CGPointMake(, tickWidth * )];             // B

        [tickPath addLineToPoint:CGPointMake(tickWidth * , tickWidth * )]; // C

        [tickPath addLineToPoint:CGPointMake(tickWidth * , tickWidth)];     // D

        [tickPath addLineToPoint:CGPointMake(tickWidth, tickWidth)];         // E

        [tickPath addLineToPoint:CGPointMake(tickWidth, )];                 // F

        [tickPath closePath];

        // Now rotate it through -45 degrees...

        [tickPath applyTransform:CGAffineTransformMakeRotation(-M_PI_4)];

        // ...and move it into the right place.

        [tickPath applyTransform:CGAffineTransformMakeTranslation(radius * 0.43, radius)];

        // Account for non-square views

        CGFloat xOffset = rect.size.width/ - radius;

        CGFloat yOffset = rect.size.height/ - radius;

        [tickPath applyTransform:CGAffineTransformMakeTranslation(xOffset, yOffset)];

        // Add fill color if it's set

        if (self.tickColor) {

            [[self tickColor] setFill];

            [tickPath fill];

        }

        // Add the tick path to the existing circle path

        [path appendPath:tickPath];

    };

    path.usesEvenOddFillRule = YES;

    [[self color] setFill];

    [path fill];

}

#pragma mark - Accessibility

- (BOOL)isAccessibilityElement {

    return YES;

}

- (NSString *)accessibilityLabel {

    return NSLocalizedString(@"Progress", @"Accessibility label for GSProgressView");

}

- (NSString *)accessibilityValue {

    // Report progress as a percentage, same as UISlider, UIProgressView

    return [NSString stringWithFormat:@"%d%%", (int)round([self progress] * 100.0)];

}

- (UIAccessibilityTraits)accessibilityTraits {

    return UIAccessibilityTraitUpdatesFrequently;

}

@end