图片切成两个图 9os-immage

最新推荐文章于 2024-02-06 22:04:01 发布

james_1010

最新推荐文章于 2024-02-06 22:04:01 发布

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本文介绍了一种将图像分为两部分的方法，并通过在指定比例上绘制线条实现分割，利用Core Graphics库进行图像操作。

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+(NSArray *)splitImageIntoTwoParts:(UIImage *)image
{
    CGFloat scale = [[UIScreen mainScreen] scale];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:2];
    CGFloat width,height,widthgap,heightgap;
    int piceCount = SAWTOOTH_COUNT;
    width = image.size.width;
    height = image.size.height;
    widthgap = 0;//width/SAWTOOTH_WIDTH_FACTOR;
    heightgap = height/piceCount;
    //    CGRect rect = CGRectMake(0, 0, width, height);
    CGContextRef context;
    CGImageRef imageMasked;
    UIImage *leftImage,*rightImage;

    //part one
    UIGraphicsBeginImageContext(CGSizeMake(width*scale, height*scale));
    context = UIGraphicsGetCurrentContext();
    CGContextScaleCTM(context, scale, scale);
    CGContextMoveToPoint(context, 0, 0);
    int a=-1;
    for (int i=0; i<piceCount+1; i++) {
        CGContextAddLineToPoint(context, width/2+(widthgap*a), heightgap*i);
        a= a*-1;
    }
    CGContextAddLineToPoint(context, 0, height);
    CGContextClosePath(context);
    CGContextClip(context);
    [image drawAtPoint:CGPointMake(0, 0)];
    imageMasked = CGBitmapContextCreateImage(context);
    leftImage = [UIImage imageWithCGImage:imageMasked scale:scale orientation:UIImageOrientationUp];
    [array addObject:leftImage];
    UIGraphicsEndImageContext();

    //part two
    UIGraphicsBeginImageContext(CGSizeMake(width*scale, height*scale));
    context = UIGraphicsGetCurrentContext();
    CGContextScaleCTM(context, scale, scale);
    CGContextMoveToPoint(context, width, 0);
    a=-1;
    for (int i=0; i<piceCount+1; i++) {
        CGContextAddLineToPoint(context, width/2+(widthgap*a), heightgap*i);
        a= a*-1;
    }
    CGContextAddLineToPoint(context, width, height);
    CGContextClosePath(context);
    CGContextClip(context);
    [image drawAtPoint:CGPointMake(0, 0)];
    imageMasked = CGBitmapContextCreateImage(context);
    rightImage = [UIImage imageWithCGImage:imageMasked scale:scale orientation:UIImageOrientationUp];
    [array addObject:rightImage];
    UIGraphicsEndImageContext();


    return array;
}