Question

Can you help. Want to draw a polygon (beams at different angles) and apply box 2d body to it. Can you please let me know how to create a CCSprite with a polygon shape
Any examples would help
Cheers

Answer 1

1. Create Polygon body.

   -(void) createDynamicPoly {  
       b2BodyDef bodyDefPoly;    
       bodyDefPoly.type = b2_dynamicBody;
       bodyDefPoly.position.Set(3.0f, 10.0f);
       b2Body *polyBody = world->CreateBody(&bodyDefPoly);
       int count = 8;
       b2Vec2 vertices[8];
       vertices[0].Set(0.0f / PTM_RATIO,0.0f / PTM_RATIO);
       vertices[1].Set(48.0f/PTM_RATIO,0.0f/PTM_RATIO);
       vertices[2].Set(48.0f/PTM_RATIO,30.0f/PTM_RATIO);
       vertices[3].Set(42.0f/PTM_RATIO,30.0f/PTM_RATIO);
       vertices[4].Set(30.0f/PTM_RATIO,18.0f/PTM_RATIO);
       vertices[5].Set(18.0f/PTM_RATIO,12.0f/PTM_RATIO);
       vertices[6].Set(6.0f/PTM_RATIO,18.0f/PTM_RATIO);
       vertices[7].Set(0.0f/PTM_RATIO,30.0f/PTM_RATIO);
       b2PolygonShape polygon;
       polygon.Set(vertices, count);
       b2FixtureDef fixtureDefPoly;
       fixtureDefPoly.shape = &polygon;
       fixtureDefPoly.density = 1.0f;
       fixtureDefPoly.friction = 0.3f;
       polyBody->CreateFixture(&fixtureDefPoly);    
   }
   

2. Create your sprite

3. Attach your sprite to the Polygon body via Fixture and UserData

   fixtureDefPoly.SetUserData() = spriteObject;  
   b2Fixture *fixture;  
   fixture = circleBody->CreateFixture(&fixtureDefPoly);  
   fixture->SetUserData(@"spriteObject");  
   

4. Then Iterate the sprite to the body in your update method.