PhysicsBody.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2019 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_PHYSICS_BODY_H
#define GF_PHYSICS_BODY_H

#include <memory>

#include "Circ.h"
#include "PhysicsGeometry.h"
#include "Polygon.h"
#include "Rect.h"
#include "Time.h"
#include "Transform.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  struct RenderStates;
  class RenderTarget;
  struct Penetration;

  class GF_API PhysicsBody {
  public:
    enum Type {
      Static, 
      Dynamic, 
    };

    PhysicsBody(const PhysicsGeometry& geometry, Type type = Dynamic);

    Type getType() const {
      return m_type;
    }

    void step(float dt);

    void render(RenderTarget& target, const RenderStates& states) const;

    Vector2f getPosition() const {
      return m_position;
    }

    void setPosition(Vector2f position);

    void move(Vector2f offset);

    Vector2f getLinearVelocity() const {
      return m_linearVelocity;
    }

    void setLinearVelocity(Vector2f velocity) {
      m_linearVelocity = velocity;
    }

    void applyLinearImpulse(Vector2f impulse);

    Vector2f getAcceleration() const {
      return m_acceleration;
    }

    void applyForce(Vector2f force);

    float getAngle() const {
      return m_angle;
    }

    void setAngle(float angle) {
      m_angle = angle;
    }

    void turn(float arc) {
      m_angle += arc;
    }

    void setVelocityFromAngle();

    void updateTransform();

    const Transform& getTransform() const;


    void setRestitution(float restitution) {
      m_restitution = restitution;
    }

    float getRestitution() const {
      return m_restitution;
    }

    void setStaticFriction(float friction) {
      m_staticFriction = friction;
    }

    float getStaticFriction() const {
      return m_staticFriction;
    }

    void setDynamicFriction(float friction) {
      m_dynamicFriction = friction;
    }

    float getDynamicFriction() const {
      return m_dynamicFriction;
    }

    void setLinearDamping(float damping) {
      m_linearDamping = damping;
    }

    float getLinearDamping() const {
      return m_linearDamping;
    }

    void setDensity(float density);

    float getInverseMass() const {
      return m_inverseMass;
    }

    bool collidesWith(const PhysicsBody& other, Penetration& p) const;

  private:
    Type m_type;

    Vector2f m_position;
    Vector2f m_linearVelocity;
    Vector2f m_acceleration;

    float m_angle;

    float m_inverseMass;

    float m_restitution;
    float m_staticFriction;
    float m_dynamicFriction;
    float m_linearDamping;

    Transform m_transform;

    const PhysicsGeometry& m_geometry;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_PHYSICS_BODY_H