//

//  MGSplitCornersView.m

//  MGSplitView

//

//  Created by Matt Gemmell on 28/07/2010.

//  Copyright 2010 Instinctive Code.

//

#import "MGSplitCornersView.h"

@implementation MGSplitCornersView

#pragma mark -

#pragma mark Setup and teardown

- (id)initWithFrame:(CGRect)frame

{

    if ((self = [super initWithFrame:frame])) {

		self.contentMode = UIViewContentModeRedraw;

		self.userInteractionEnabled = NO;

		self.opaque = NO;

		self.backgroundColor = [UIColor clearColor];

		cornerRadius = 0.0; // actual value is set by the splitViewController.

		cornersPosition = MGCornersPositionLeadingVertical;

    }

    return self;

}

- (void)dealloc

{

	self.cornerBackgroundColor = nil;

    [super dealloc];

}

#pragma mark -

#pragma mark Geometry helpers

static double deg2Rad(double degrees)

{

    // Converts degrees to radians.

    return degrees * (M_PI / 180.0);

}

#pragma mark -

#pragma mark Drawing

- (void)drawRect:(CGRect)rect

{

	// Draw two appropriate corners, with cornerBackgroundColor behind them.

	if (cornerRadius > 0) {

		float maxX = CGRectGetMaxX(self.bounds);

		float maxY = CGRectGetMaxY(self.bounds);

		UIBezierPath *path = [UIBezierPath bezierPath];

		CGPoint pt = CGPointZero;

		switch (cornersPosition) {

			case MGCornersPositionLeadingVertical: // top of screen for a left/right split

				[path moveToPoint:pt];

				pt.y += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(90) endAngle:0 clockwise:YES]];

				pt.x += cornerRadius;

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				[path addLineToPoint:CGPointZero];

				[path closePath];

				pt.x = maxX - cornerRadius;

				pt.y = 0;

				[path moveToPoint:pt];

				pt.y = maxY;

				[path addLineToPoint:pt];

				pt.x += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(180) endAngle:(float)deg2Rad(90) clockwise:YES]];

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				break;

			case MGCornersPositionTrailingVertical: // bottom of screen for a left/right split

				pt.y = maxY;

				[path moveToPoint:pt];

				pt.y -= cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(270) endAngle:(float)deg2Rad(360) clockwise:NO]];

				pt.x += cornerRadius;

				pt.y += cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				pt.x = maxX - cornerRadius;

				pt.y = maxY;

				[path moveToPoint:pt];

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				pt.x += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(180) endAngle:(float)deg2Rad(270) clockwise:NO]];

				pt.y += cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				break;

			case MGCornersPositionLeadingHorizontal: // left of screen for a top/bottom split

				pt.x = 0;

				pt.y = cornerRadius;

				[path moveToPoint:pt];

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				pt.x += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(180) endAngle:(float)deg2Rad(270) clockwise:NO]];

				pt.y += cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				pt.x = 0;

				pt.y = maxY - cornerRadius;

				[path moveToPoint:pt];

				pt.y = maxY;

				[path addLineToPoint:pt];

				pt.x += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(180) endAngle:(float)deg2Rad(90) clockwise:YES]];

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				break;

			case MGCornersPositionTrailingHorizontal: // right of screen for a top/bottom split

				pt.y = cornerRadius;

				[path moveToPoint:pt];

				pt.y -= cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(270) endAngle:(float)deg2Rad(360) clockwise:NO]];

				pt.x += cornerRadius;

				pt.y += cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				pt.y = maxY - cornerRadius;

				[path moveToPoint:pt];

				pt.y += cornerRadius;

				[path appendPath:[UIBezierPath bezierPathWithArcCenter:pt radius:cornerRadius startAngle:(float)deg2Rad(90) endAngle:0 clockwise:YES]];

				pt.x += cornerRadius;

				pt.y -= cornerRadius;

				[path addLineToPoint:pt];

				pt.x -= cornerRadius;

				[path addLineToPoint:pt];

				[path closePath];

				break;

			default:

				break;

		}

		[self.cornerBackgroundColor set];

		[path fill];

	}

}

#pragma mark -

#pragma mark Accessors and properties

- (void)setCornerRadius:(float)newRadius

{

	if (newRadius != cornerRadius) {

		cornerRadius = newRadius;

		[self setNeedsDisplay];

	}

}

- (void)setSplitViewController:(MGSplitViewController *)theController

{

	if (theController != splitViewController) {

		splitViewController = theController;

		[self setNeedsDisplay];

	}

}

- (void)setCornersPosition:(MGCornersPosition)posn

{

	if (cornersPosition != posn) {

		cornersPosition = posn;

		[self setNeedsDisplay];

	}

}

- (void)setCornerBackgroundColor:(UIColor *)color

{

	if (color != cornerBackgroundColor) {

		cornerBackgroundColor = color;

		[self setNeedsDisplay];

	}

}

@synthesize cornerRadius;

@synthesize splitViewController;

@synthesize cornersPosition;

@synthesize cornerBackgroundColor;

@end