//
//  ImageSameWidth.m
//  huoban
//
//  Created by 刘雨辰 on 15/9/23.
//  Copyright (c) 2015年 lyc. All rights reserved.
//

#import "ImageSameWidth.h"

@implementation ImageSameWidth


//指定宽度按比例缩放
+(UIImage *) imageCompressForWidth:(UIImage *)sourceImage targetWidth:(CGFloat)defineWidth{
    
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;
    CGFloat targetWidth = defineWidth;
    CGFloat targetHeight = height / (width / targetWidth);
    CGSize size = CGSizeMake(targetWidth, targetHeight);
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);
    
    if(CGSizeEqualToSize(imageSize, size) == NO){
        
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        
        if(widthFactor > heightFactor){
            scaleFactor = widthFactor;
        }
        else{
            scaleFactor = heightFactor;
        }
        scaledWidth = width * scaleFactor;
        scaledHeight = height * scaleFactor;
        
        if(widthFactor > heightFactor){
            
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
            
        }else if(widthFactor < heightFactor){
            
            thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
    }
    
    UIGraphicsBeginImageContext(size);
    
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width = scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    
    [sourceImage drawInRect:thumbnailRect];
    
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    if(newImage == nil){
        
        NSLog(@"缩放图片报错");
    }
    UIGraphicsEndImageContext();
    return newImage;
}

+(UIImage *)imageCompressForHeight:(UIImage *)sourceImage targetHeight:(CGFloat)defineHeight{
    
    
    
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;

    CGFloat targetHeight = defineHeight;
    CGFloat targetWidth = width / (height / targetHeight);
    
    
    CGSize size = CGSizeMake(targetWidth, targetHeight);
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);
    
    if(CGSizeEqualToSize(imageSize, size) == NO){
        
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        
        if(widthFactor > heightFactor){
            scaleFactor = widthFactor;
        }
        else{
            scaleFactor = heightFactor;
        }
        scaledWidth = width * scaleFactor;
        scaledHeight = height * scaleFactor;
        
        if(widthFactor > heightFactor){
            
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
            
        }else if(widthFactor < heightFactor){
            
            thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
    }
    
    UIGraphicsBeginImageContext(size);
    
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width = scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    
    [sourceImage drawInRect:thumbnailRect];
    
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    if(newImage == nil){
        
        NSLog(@"缩放图片报错");
    }
    UIGraphicsEndImageContext();
    return newImage;
}

+ (CGSize)getSizeWithStr:(NSString*)str width:(float)width font:(float)font
{
//    NSDictionary *attribute = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:font]};
    
NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:font]};

    CGSize temSize = [str boundingRectWithSize:CGSizeMake(width, MAXFLOAT) // 用于计算文本绘制时占据的矩形块
                                       options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading // 文本绘制时的附加选项
                                    attributes:attribute        // 文字的属性
                                       context:nil].size; // context上下文。包括一些信息，例如如何调整字间距以及缩放。该对象包含的信息将用于文本绘制。该参数可为nil
    return temSize;
}

@end