如何仅重复图像的一部分? [英] how to repeat only part of an image?

问题描述

如何仅重复图像的一部分

how to repeat only part of an image,

有两张图片.

i.stack.imgur.com/KC0Pm.png

原始图片类似于上面的内容 我想将其更改为:

the source pic is something like the above and i want to change it to:

i.stack.imgur.com/t8CwQ.png

这意味着我只想重复图像的一部分?不拉伸原始图片， 有可能这样做吗?

this means i just want to repeat only part of the image? not stretch the source pic, is it possible to do that?

谢谢 更新:

此处的代码: http://www.box.net/shared/cmtz0e48a5urtajxu4yn 仍然有问题！

CODE HERE : http://www.box.net/shared/cmtz0e48a5urtajxu4yn still have problem!!

更新: 我裁剪了图像文件，只重复了一部分，但是仍然有一些问题.

Update: i crop my image file and just repeat the part,but i still have some problem.

- (UIImage *)imageWithImage:(NSString *)iconName covertToSize:(CGSize)size {
CGRect topLeft,topRight,bottomLeft,bottomRight,top,bottom,left,right;
if ([iconName isEqualToString:@"border_baikuang"]) {
    topLeft = CGRectMake(0, 0, 18, 18);
    topRight = CGRectMake(108-18, 0, 18, 18);
    bottomLeft = CGRectMake(0, 104-18, 18, 18);
    bottomRight = CGRectMake(108-18, 104-18, 18, 18);
    top = CGRectMake(18, 0, 1, 18);
    bottom = CGRectMake(18, 104-18, 1, 18);
    left = CGRectMake(0, 18, 18, 1);
    right = CGRectMake(108-18, 18, 18, 1);
} else if ([iconName isEqualToString:@"border_fuguxiangkuang"]) {
    topLeft = CGRectMake(0, 0, 28, 28);
    topRight = CGRectMake(108-28, 0, 28, 28);
    bottomLeft = CGRectMake(0, 104-28, 28, 28);
    bottomRight = CGRectMake(108-28, 104-28, 28, 28);
    top = CGRectMake(28, 0, 28, 24);
    bottom = CGRectMake(28, 104-28, 28, 24);
    left = CGRectMake(0, 28, 24, 28);
    right = CGRectMake(108-24, 28, 24, 28);
}
float width = size.width;
float height = size.height;
UIGraphicsBeginImageContext(size);
//
UIImage *topLeftPattern = [self fetchImgWithSrc:iconName rect:topLeft];
[topLeftPattern drawInRect:CGRectMake(0, 0, topLeftPattern.size.width, topLeftPattern.size.height)];

UIImage *topRightPattern = [self fetchImgWithSrc:iconName rect:topRight];
[topRightPattern drawInRect:CGRectMake(width-topRightPattern.size.width, 0, topRightPattern.size.width, topRightPattern.size.height)];

UIImage *bottomLeftPattern = [self fetchImgWithSrc:iconName rect:bottomLeft];
[bottomLeftPattern drawInRect:CGRectMake(0, height-bottomLeftPattern.size.height, bottomLeftPattern.size.width, bottomLeftPattern.size.height)];

UIImage *bottomRightPattern = [self fetchImgWithSrc:iconName rect:bottomRight];
[bottomRightPattern drawInRect:CGRectMake(width-bottomRightPattern.size.width, height-bottomRightPattern.size.height, bottomRightPattern.size.width, bottomRightPattern.size.height)];

UIImage *topPattern = [self fetchImgWithSrc:iconName rect:top];
[topPattern drawAsPatternInRect:CGRectMake(topLeftPattern.size.width, 0, width-topRightPattern.size.width-topLeftPattern.size.width, topPattern.size.height)];

UIImage *bottomPattern = [self fetchImgWithSrc:iconName rect:bottom];
[bottomPattern drawAsPatternInRect:CGRectMake(bottomLeftPattern.size.width, height-bottomLeftPattern.size.height, width-bottomRightPattern.size.width-bottomLeftPattern.size.width, bottomPattern.size.height)];

UIImage *leftPattern = [self fetchImgWithSrc:iconName rect:left];
[leftPattern drawAsPatternInRect:CGRectMake(0, topLeftPattern.size.height, leftPattern.size.width, height-bottomLeftPattern.size.height-topLeftPattern.size.height)];

UIImage *rightPattern = [self fetchImgWithSrc:iconName rect:right];
[rightPattern drawAsPatternInRect:CGRectMake(width-topRightPattern.size.width, topRightPattern.size.height, rightPattern.size.width, height-bottomRightPattern.size.height - topRightPattern.size.height)];

UIImage *destImage = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();
return destImage;

}

- (UIImage*)fetchImgWithSrc:(NSString *)iconName rect:(CGRect)clipRect {

NSString *completeName = [iconName stringByAppendingString:@".png"];
UIImage *src = [UIImage imageFromFileName:completeName];
NSLog(@"src=%@",NSStringFromCGSize(src.size));
UIImage *tmpPattern = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(src.CGImage, clipRect)];
NSLog(@"dest=%@",NSStringFromCGSize(tmpPattern.size));
return tmpPattern;

}

结果是这样的: http://i.stack.imgur.com/jO0O5.png

有什么问题吗?

谢谢

推荐答案

iOS 5中有stretchableImageWithLeftCapWidth:topCapHeight:(最高4.3)或resizableImageWithCapInsets:

There's stretchableImageWithLeftCapWidth:topCapHeight: (up to 4.3) or resizableImageWithCapInsets: in iOS 5

这篇关于如何仅重复图像的一部分?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！