Physac下載 - Physac源代碼下載

Physac

C#源碼

version with raylib 2.5

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Physac

Physac是用PureC編寫的小型2D物理髮動機。發動機使用固定的時步線圈來模擬物理。物理步驟包含以下階段：獲取碰撞信息，應用動態，碰撞解決和位置校正。它使用一個非常簡單的結構，用於在任何3D渲染API中使用位置向量的物理體。

標題文件包含一些可調整的定義值，以適合用戶想要的結果，而結果最小的結果。這些價值中的大多數都對其用途進行了一些解釋。

注意：示例代碼使用Raylib編程庫創建程序窗口和渲染框架。

安裝

Physac需要Raylib。要獲得它，請按照下一步：

 * Go to [raylib](https://www.github.com/raysan5/raylib) and clone the repository.
* Ensure to pull the last changes of 'master' branch.
* Use code inside examples header comments to compile and execute.

Physac API

物理結構包含所有動態信息和碰撞形狀。用戶應使用以下結構組件：

 typedef struct * PhysicsBody {
    unsigned int id ;
    bool enabled ;                   // Enabled dynamics state (collisions are calculated anyway)
    Vector2 position ;               // Physics body shape pivot
    Vector2 velocity ;               // Current linear velocity applied to position
    Vector2 force ;                  // Current linear force (reset to 0 every step)
    float angularVelocity ;          // Current angular velocity applied to orient
    float torque ;                   // Current angular force (reset to 0 every step)
    float orient ;                   // Rotation in radians
    float staticFriction ;           // Friction when the body has not movement (0 to 1)
    float dynamicFriction ;          // Friction when the body has movement (0 to 1)
    float restitution ;              // Restitution coefficient of the body (0 to 1)
    bool useGravity ;                // Apply gravity force to dynamics
    bool isGrounded ;                // Physics grounded on other body state
    bool freezeOrient ;              // Physics rotation constraint
    PhysicsShape shape ;             // Physics body shape information (type, radius, vertices, normals)
} * PhysicsBody ;

標頭包含一些可自定義的定義值。我設置了使我最佳結果的價值觀。

 #define     PHYSAC_MAX_BODIES               64
#define     PHYSAC_MAX_MANIFOLDS            4096
#define     PHYSAC_MAX_VERTICES             24
#define     PHYSAC_CIRCLE_VERTICES          24

#define     PHYSAC_COLLISION_ITERATIONS     100
#define     PHYSAC_PENETRATION_ALLOWANCE    0.05f
#define     PHYSAC_PENETRATION_CORRECTION   0.4f

Physac包含用於內存管理功能的定義（Malloc，免費），使用戶有機會實施自己的內存功能：

 #define     PHYSAC_MALLOC ( size )             malloc(size)
#define     PHYSAC_FREE ( ptr )                free(ptr)

用戶的Physac API功能可用如下：

 // Initializes physics values, pointers and creates physics loop thread
void InitPhysics ( void );

// Returns true if physics thread is currently enabled
bool IsPhysicsEnabled ( void );

// Sets physics global gravity force
void SetPhysicsGravity ( float x , float y );

// Creates a new circle physics body with generic parameters
PhysicsBody CreatePhysicsBodyCircle ( Vector2 pos , float radius , float density );

// Creates a new rectangle physics body with generic parameters
PhysicsBody CreatePhysicsBodyRectangle ( Vector2 pos , float width , float height , float density );

// Creates a new polygon physics body with generic parameters
PhysicsBody CreatePhysicsBodyPolygon ( Vector2 pos , float radius , int sides , float density );

// Adds a force to a physics body
void PhysicsAddForce ( PhysicsBody body , Vector2 force );

// Adds a angular force to a physics body
void PhysicsAddTorque ( PhysicsBody body , float amount );

// Shatters a polygon shape physics body to little physics bodies with explosion force
void PhysicsShatter ( PhysicsBody body , Vector2 position , float force );

// Returns the current amount of created physics bodies
int GetPhysicsBodiesCount ( void );

// Returns a physics body of the bodies pool at a specific index
PhysicsBody GetPhysicsBody ( int index );

// Returns the physics body shape type (PHYSICS_CIRCLE or PHYSICS_POLYGON)
int GetPhysicsShapeType ( int index );

// Returns the amount of vertices of a physics body shape
int GetPhysicsShapeVerticesCount ( int index );

// Returns transformed position of a body shape (body position + vertex transformed position)
Vector2 GetPhysicsShapeVertex ( PhysicsBody body , int vertex );

// Sets physics body shape transform based on radians parameter
void SetPhysicsBodyRotation ( PhysicsBody body , float radians );

// Unitializes and destroy a physics body
void DestroyPhysicsBody ( PhysicsBody body );

// Unitializes physics pointers and closes physics loop thread
void ClosePhysics ( void );