Cocos2d iPhone - 雪碧剪贴/面具/框架 [英] Cocos2d iPhone - Sprite cliping/mask/frame

问题描述

我如何剪辑/裁剪/掩码或只是设置CCSprite在Cocos2D的框架？

how can i clip/crop/mask or just set the frame of a CCSprite in Cocos2D?

类似于：
设置UIView ，with clipping subviews = TRUE

Something similar to: setting the frame for UIView, with clipping subviews = TRUE

我的CCSprite 主sprite 已添加多个子sprite 。
我只希望主 Sprite Sprite 部分的掩码可见。
有没有办法剪辑或使用CCSprite的面具？

My CCSprite Main Sprite have multiple Child Sprite added to it. I only want Mask part of that Main Sprite Sprite visible. Is there a way to clip or use a mask for CCSprite?

我可以剪切顶部的背景和图层，只留下可见区域，但是这是唯一的方法吗？

I could cut the background and layer that on top, leaving only that visible area, but is that the only way?!

这里是一个示例图像演示我试图实现：

here's a sample image demonstrating what I'm trying to achieve:

推荐答案

我最终使用GL_SCISSOR。

I ended up using GL_SCISSOR.

在MainSprite中我受到影响：

in MainSprite I impemented:

- (void) visit
{
    if (!self.visible) {
        return;
    }
    glEnable(GL_SCISSOR_TEST);
    glScissor(x, y, width, height);   
    [super visit];
    glDisable(GL_SCISSOR_TEST);
}

这将剪辑或遮盖指定区域。

This will clip or mask the specified area.

唯一棘手的是，在横向模式下，Cocos2D在屏幕的左下角有0,0，而OpenGL在右下角有它不考虑屏幕的方向。

The only tricky bit is that in Landscape mode Cocos2D has 0,0 at the bottom-left side of the screen, while OpenGL has it at the bottom-right corner as it doesn't consider the orientation of the screen.

换句话说，对于OpenGL，考虑你有一个旋转的肖像屏幕。

In other words, for OpenGL consider you have a rotated portrait Screen.

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