我正在创建一个与其他图像中的元素相结合的拼贴画。这是一些 ASCII 艺术来解释我在做什么:
Given images A, B and C,
AAA, BBB, CCC
AAA, BBB, CCC
AAA, BBB, CCC
I take part of A, part of B and part of C as columns:
Axx, xBx, xxC
Axx, xBx, xxC
Axx, xBx, xxC
...and combine them in one image like this:
ABC
ABC
ABC
where the first 1/3rd of the image is a colum of A's pic, the middle is a column of B's pic and the last is a column of C's pic.
我写了一些代码,但它只显示第一列而不是其余的……我想我必须以某种方式清除剪辑,但我不确定如何去做,或者这是否是最好的方法。
+ (UIImage *)collageWithSize:(NSInteger)size fromImages:(NSArray *)images {
NSMutableArray *selectedImages = [NSMutableArray array];
[selectedImages addObjectsFromArray:images];
// use the selectedImages for generating the thumbnail
float columnWidth = (float)size/(float)[selectedImages count];
//create a context to do our clipping in
UIGraphicsBeginImageContext(CGSizeMake(size, size));
CGContextRef currentContext = UIGraphicsGetCurrentContext();
for (int i = 0; i < [selectedImages count]; i++) {
// get the current image
UIImage *image = [selectedImages objectAtIndex:i];
//create a rect with the size we want to crop the image to
CGRect clippedRect = CGRectMake(i*columnWidth, 0, columnWidth, size);
CGContextClipToRect(currentContext, clippedRect);
//create a rect equivalent to the full size of the image
CGRect drawRect = CGRectMake(0, 0, size, size);
//draw the image to our clipped context using our offset rect
CGContextDrawImage(currentContext, drawRect, image.CGImage);
}
//pull the image from our cropped context
UIImage *collage = UIGraphicsGetImageFromCurrentImageContext();
//pop the context to get back to the default
UIGraphicsEndImageContext();
//Note: this is autoreleased
return collage;
}
我究竟做错了什么?
PS图像也颠倒了。