在cocos2d中获取CCSprite的绝对位置 [英] Getting absolute position of CCSprite in cocos2d

问题描述

在我的游戏中，我有一个 CCSprite 绕另一个 CCSprite 旋转，就像电子绕原子核旋转一样。我将电子作为原子核的子代，以使动画更简单。我所要做的就是旋转原子核，并且电子非常顺畅地跟随套件。

In my game, I have a CCSprite that orbits another CCSprite, much like an electron orbiting a nucleus. I have the electron as a child of the nucleus, to make animation much simpler. All I have to do is rotate the nucleus and the electron follows suite quite nicely.

但是，我的问题出在想让轨道动画显得更时髦一点，要么添加诸如粒子系统轨迹之类的东西，要么沿着电子路径添加带状效应。我不能简单地将粒子系统添加到电子本身，因为粒子也不能正确地跟随，因为它们也会被原子核旋转。如果我将粒子系统添加到 self 中，则它们将正确显示，但与应该跟踪的对象不在同一位置。

However, my problem comes from wanting to have the orbit animation appear a little snazzier, by either adding something like a particle system trail, or a ribbon effect following the path of the electron. I cannot simply add a particle system to the electron itself, because the particles don't follow correctly, since they are being rotated by the nucleus as well. If I add the particle system to self, then they appear correctly, but not in the same position as the object they are supposed to be trailing.

我的问题是：

有没有一种方法可以获取物体（例如电子）的场景位置，而不是仅仅具有

Is there a way to get the scene position of an object, say the electron, as opposed to only having access to it's position relative to it's parent?

谢谢。

推荐答案

是的！

每个CCNode及其后代都有能力获得相对于场景的位置：

Each CCNode and its descendants has the ability to get a position relative to the scene:

CGPoint worldCoord = [mySprite convertToWorldSpace：mySprite.position];

CGPoint worldCoord = [mySprite convertToWorldSpace: mySprite.position];

此worldCoordinate将相对于场景而不是父节点！

This worldCoordinate will be relative to the scene as opposed to the parent node!

希望有帮助！ ^ _ ^

Hope this helped! ^_^

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