Open spotlight and search for GLES-Render.cpp. This file will be there in a path in the cocos2dx folder. Open the enclosing folder and drag the files GLES-Render.h and GLES-Render.cpp to the project. Then add the following code in the init method
b2Draw *m_debugDraw = new GLESDebugDraw(PTM_RATIO);
uint32 flags = 0;
flags += b2Draw::e_shapeBit;
flags += b2Draw::e_jointBit;
flags += b2Draw::e_aabbBit;
flags += b2Draw::e_pairBit;
flags += b2Draw::e_centerOfMassBit;
m_debugDraw->SetFlags(flags);
H_world->SetDebugDraw(m_debugDraw);
Then add the draw method.
void HelloWorld::draw()
{
kmGLPushMatrix();
H_world->DrawDebugData();
kmGLPopMatrix();
}
Don't forget to include GLES-Render.h