//
//  UIImage+wiRoundedRectImage.m
//  ThePaperHD
//
//  Created by scar1900 on 15/1/5.
//  Copyright (c) 2015年 scar1900. All rights reserved.
//

#import "UIImage+wiRoundedRectImage.h"

@implementation UIImage (wiRoundedRectImage)

static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,
                                 float ovalHeight)
{
    float fw, fh;
    
    if (ovalWidth == 0 || ovalHeight == 0)
    {
        CGContextAddRect(context, rect);
        return;
    }
    
    CGContextSaveGState(context);
    CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));
    CGContextScaleCTM(context, ovalWidth, ovalHeight);
    fw = CGRectGetWidth(rect) / ovalWidth;
    fh = CGRectGetHeight(rect) / ovalHeight;
    
    CGContextMoveToPoint(context, fw, fh/2);  // Start at lower right corner
    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);  // Top right corner
    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner
    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner
    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right
    
    CGContextClosePath(context);
    CGContextRestoreGState(context);
}

+ (UIImage*)cutImageWithRadius:(int)radius withImage:(UIImage *)image
{
    UIGraphicsBeginImageContext(CGSizeMake(28, 28));
    CGContextRef gc = UIGraphicsGetCurrentContext();
    
    float x1 = 0.;
    float y1 = 0.;
    float x2 = x1+28;
    float y2 = y1;
    float x3 = x2;
    float y3 = y1+28;
    float x4 = x1;
    float y4 = y3;
    radius = radius*2;
    
    CGContextMoveToPoint(gc, x1, y1+radius);
    CGContextAddArcToPoint(gc, x1, y1, x1+radius, y1, radius);
    CGContextAddArcToPoint(gc, x2, y2, x2, y2+radius, radius);
    CGContextAddArcToPoint(gc, x3, y3, x3-radius, y3, radius);
    CGContextAddArcToPoint(gc, x4, y4, x4, y4-radius, radius);
    
    
    CGContextClosePath(gc);
    CGContextClip(gc);
    
    CGContextTranslateCTM(gc, 0, 28);
    CGContextScaleCTM(gc, 1, -1);
    CGContextDrawImage(gc, CGRectMake(0, 0, 28, 28), image.CGImage);
    
    
    
    UIImage *newimage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return newimage;
}

+ (id)createRoundedRectImage:(UIImage*)image size:(CGSize)size radius:(NSInteger)r
{
    // the size of CGContextRef
//    TPLOG(@"开始做圆角图片");
    int w = size.width;
    int h = size.height;
    
    UIImage *img = image;
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
    CGRect rect = CGRectMake(0, 0, w, h);
    
    CGContextBeginPath(context);
    addRoundedRectToPath(context, rect, r, r);
    CGContextClosePath(context);
    CGContextClip(context);
    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
    CGImageRef imageMasked = CGBitmapContextCreateImage(context);
    img = [UIImage imageWithCGImage:imageMasked];
    
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
    CGImageRelease(imageMasked);
    
    return img;
}

+ (UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset {
    UIGraphicsBeginImageContext(image.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, 0);
    CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
    CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
    CGContextAddEllipseInRect(context, rect);
    CGContextClip(context);
    
    [image drawInRect:rect];
    CGContextAddEllipseInRect(context, rect);
    CGContextStrokePath(context);
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newimg;
}

@end