Cocos2d + Box2d - 如何调试/显示身体？ [英] Cocos2d + Box2d - how to debug/show bodies?

问题描述

我使用Cocos2d（2.0）和随其打包的Box2d创建了一个非常简单的设置。我在我的世界有几个身体，但没有sprites与他们连接，我想调试他们的方向，位置等。

这似乎是一个漂亮的标准任务，但我不知道如何轻松地做到这一点。从我的研究，它似乎与这些方法相关：

  _world-> SetDebugDraw 
 _world-> DrawDebugData（...）; 
 //和GLES-Render类别
  

帮助？

$ b $

li>在初始化时，你想创建一个调试绘图对象
（GLESDebugDraw自带Cocos2d + Box2d）。

1. 设置标记以指定要绘制的内容（形状，重心，关节等）。


2. 将其分配给世界对象。

b2Draw * debugDraw = new GLESDebugDraw（PTM_RATIO）;

debugDraw-> SetFlags（GLESDebugDraw :: e_shapeBit）;

_world-> SetDebugDraw（debugDraw）;

然后，诀窍是你需要重写 ccLayer的绘图方法并调用：

_world-> DrawDebugData（）; p>

它必须在绘制方法中，否则这将不工作。我最初试图把它放在我自己的计划方法（我调用_world-> step（）），这不工作。

I've created a pretty simple setup using Cocos2d (2.0) and Box2d that comes packaged with it. I have a few bodies in my world, but don't have sprites linked up with them yet and I want to debug their orientations, positions, etc.

This seems like a pretty standard task, but I could not find out how to do this easily. From my research it seems related to these methods:

_world->SetDebugDraw(...);
_world->DrawDebugData(...);
// and the GLES-Render class

Help?

解决方案

I figured it out in case anyone else stumbles across this.

1. In your initialization, you want to create a debug draw object (GLESDebugDraw comes with Cocos2d+Box2d).
2. Set the flags to specify what you want drawn (shapes, center of gravity, joints, etc.).
3. Assign it to your world object.

b2Draw *debugDraw = new GLESDebugDraw(PTM_RATIO);

debugDraw->SetFlags(GLESDebugDraw::e_shapeBit);

_world->SetDebugDraw(debugDraw);

Then, the trick is that you need to override ccLayer's draw method and call:

_world->DrawDebugData();

It must be in the draw method otherwise this won't work. I initially tried to put it in my own scheduled method (where I call _world->step()) and this did not work.

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