使用CGContext显示精灵表iPhone [英] Using CGContext to display a sprite sheet iPhone

问题描述

所以我有一个png格式的spritesheet，并且已经计算了我想要显示的坐标。我正在尝试创建一个方法，在spritesheet上传递位置信息时将返回UIImage。我只是不确定如何使用CGContext的东西以及坐标来返回UIImage。

So I have a spritesheet in png format, and have already worked out the coordinates for what I want to display. I'm trying to create a method that will return a UIImage when passed the location information on the spritesheet. I'm just not sure how to use the CGContext stuff along with the the coordinates to return an UIImage.

我当时正在寻找CGContextClipToRect，因为我觉得这样做是可行的，但我似乎无法让它发挥作用。

I was looking to CGContextClipToRect because I think that is the way to do it, but I just can't seem to get it to work.

这样的东西


CGSize size = CGSizeMake（xSize，ySize）;

UIGraphicsBeginImageContext（size）;

//CGContextClipToRect（spriteSheet.size，imageRect）;

[spriteSheet drawAtPoint：CGPointMake（xPos，yPos）];

UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext（）;

UIGraphicsEndImageContext（）;

返回newImage;



仅返回大小上下文中的内容。如果有意义的话，我需要能够在spritesheet周围移动这个大小的窗口。

returns only what is in the size Context. I need to be able to "move" this size window around the spritesheet if that makes sense.

任何帮助都将不胜感激。

Any help would be appreciated.

谢谢，
Mike

Thanks, Mike

推荐答案

我认为您要使用的电话是 CGImageCreateWithImageInRect

I think the call you want to use is CGImageCreateWithImageInRect

newImage = [UIImage imageWithCGImage:CGImageCreateWithImageInRect( [spriteSheet CGImage] , imageRect )];

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