//
//  GradientView.m
//  Mobile Buy SDK
//
//  Created by Shopify.
//  Copyright (c) 2015 Shopify Inc. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "GradientView.h"

@implementation GradientView

- (instancetype)init
{
	self = [super init];
	if (self) {
		self.backgroundColor = [UIColor clearColor];
		self.topColor = [UIColor colorWithWhite:0 alpha:0.5f];
		self.bottomColor = [UIColor colorWithWhite:0 alpha:0];
	}
	return self;
}

- (void)drawRect:(CGRect)rect
{
	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
	CGContextRef context = UIGraphicsGetCurrentContext();

	NSArray *gradientColors = [NSArray arrayWithObjects:(id)self.topColor.CGColor, (id)self.bottomColor.CGColor, nil];
	
	CGFloat gradientLocations[] = {0, 1};
	CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) gradientColors, gradientLocations);
	
	CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect));
	CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect));
	
	CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
	CGGradientRelease(gradient);
	CGColorSpaceRelease(colorSpace);
}

@end