Cocos2d-x Physics 2-Hello Physics World

The header file at the layer defines a variable and a method.

?

Class HelloWorld: public cocos2d: Layer

?

{

?

Public:

? ? ...?

? ?? // Physics world

? ? Cocos2d: PhysicsWorld * m_physicsWorld;

? ? Void setPhysicsWorld (cocos2d: PhysicsWorld * physicsWorld) {m_physicsWorld = physicsWorld ;};

?

};

?

?

Create a scenario with physical characteristics

Scene * HelloWorld: createScene ()

{

? ? // Create a scenario with physical characteristics

? ? Auto scene = Scene: createWithPhysics ();

? ? // Enable the debugging mode of the physical engine

? ? Scene-> getPhysicsWorld ()-> setDebugDrawMask (PhysicsWorld: DEBUGDRAW_ALL );

?? ?

? ? // 'Player' is an autorelisted object

? ? Auto layer = HelloWorld: create ();

?? ?

? ? Size visibleSize = Director: getInstance ()-> getVisibleSize ();

?? ?

? ? // Create a rectangle boundary

? ? Auto nodeBody = PhysicsBody: createEdgeBox (visibleSize, PHYSICSBODY_MATERIAL_DEFAULT, 3 );

?? ?

? ? Auto node = Node: create ();

? ? Node-> setPhysicsBody (nodeBody); // you can specify a rigid body.

? ? Node-> setPosition (visibleSize. width/2, visibleSize. height/2 );

? ? Scene-> addChild (node );

?

? ?? // Pass the physical world to the layer

? ? Layer-> setPhysicsWorld (scene-> getPhysicsWorld ());?

? ? // Add layer as a child to scene

? ? Scene-> addChild (layer );

?

? ? // Return the scene

? ? Return scene;

}

?

?

?

The default gravity in the physical world is vect (0,-98 );

You can use the setGravity method to change the gravity.

Scene-> getPhysicsWorld ()-> setGravity (Vec2 (0,-500 ));

?

The createEdgeBox method has three parameters:

1. Rectangular area size

2. Set Materials

3. Edge width

?

PHYSICSBODY_MATERIAL_DEFAULT is a predefined PhysicsMaterial class. The default values are

Density = 0.0f

Restitution recovery force (elasticity) = 0.5f

Friction = 0.5f

?

?

The running result shows a red border around the screen.

?

?

?

?

?

?

?

?

?

?

?

?

?

?

Cocos2d-x Physics 2-Hello Physics World