如何将多个NSImages合成为一个大图像？ [英] How to composite several NSImages into one big image?

问题描述

我有一组对象，这些对象描述了图像名称，尺寸和X / Y位置。该集合按图层排序，因此我可以使用某种画家的算法对这些图像进行合成。

I have a collection of objects which describe an image-name, its size and it's X/Y location. The collection is sorted by "layers", so I can composite the images in a sort of painter's algorithm.

由此，我可以确定容纳所有图像的矩形图像，所以现在我要做的是：

From this, I can determine the rectangle necessary to hold all of the images, so now what I want to do is:

• 创建某种缓冲区来保存结果（与iPhoneOS的NS等效）调用UIGraphicsContext。）


• 将所有图像绘制到缓冲区中。


• 从缓冲区的合成结果中获取新的NSImage。

在iPhoneOS中，这是执行我想要的代码：

In iPhoneOS, this is the code that does what I want:

UIGraphicsBeginImageContext (woSize);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor clearColor] set];
    CGContextFillRect(ctx, NSMakeRect(0, 0, woSize.width, woSize.height));
    // draw my various images, here.
    // i.e. Various repetitions of [myImage drawAtPoint:somePoint];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

我正在寻找的是如何在Desktop Cocoa / NS中做到这一点。

What I'm looking for is how to do that in Desktop Cocoa/NS.

谢谢！

推荐答案

NSImage* resultImage = [[[NSImage alloc] initWithSize:imageSize] autorelease];
[resultImage lockFocus];

[anotherImage drawAtPoint:aPoint fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
// Or any of the other about 6 options; see Apple's guide to pick.

[resultImage unlockFocus];

检查 Apple的绘图指南，给出了更长，更详细的答案。

Check Apple's Drawing Guide for a much longer, more detailed answer.

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