/**************************************************************************/
/* godot_motion_state.h */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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#ifndef GODOT_MOTION_STATE_H
#define GODOT_MOTION_STATE_H
#include "rigid_body_bullet.h"
#include <LinearMath/btMotionState.h>
/**
@author AndreaCatania
*/
class RigidBodyBullet;
// This class is responsible to move kinematic actor
// and sincronize rendering engine with Bullet
/// DOC:
/// http://www.bulletphysics.org/mediawiki-1.5.8/index.php/MotionStates#What.27s_a_MotionState.3F
class GodotMotionState : public btMotionState {
/// This data is used to store the new world position for kinematic body
btTransform bodyKinematicWorldTransf;
/// This data is used to store last world position
btTransform bodyCurrentWorldTransform;
RigidBodyBullet *owner;
public:
GodotMotionState(RigidBodyBullet *p_owner) :<--- Class 'GodotMotionState' has a constructor with 1 argument that is not explicit. [+]Class 'GodotMotionState' has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided.
bodyKinematicWorldTransf(btMatrix3x3(1., 0., 0., 0., 1., 0., 0., 0., 1.), btVector3(0., 0., 0.)),
bodyCurrentWorldTransform(btMatrix3x3(1., 0., 0., 0., 1., 0., 0., 0., 1.), btVector3(0., 0., 0.)),
owner(p_owner) {}
/// IMPORTANT DON'T USE THIS FUNCTION TO KNOW THE CURRENT BODY TRANSFORM
/// This class is used internally by Bullet
/// Use GodotMotionState::getCurrentWorldTransform to know current position
///
/// This function is used by Bullet to get the position of object in the world
/// if the body is kinematic Bullet will move the object to this location
/// if the body is static Bullet doesn't move at all
virtual void getWorldTransform(btTransform &worldTrans) const {
worldTrans = bodyKinematicWorldTransf;
}
/// IMPORTANT: to move the body use: moveBody
/// IMPORTANT: DON'T CALL THIS FUNCTION, IT IS CALLED BY BULLET TO UPDATE RENDERING ENGINE
///
/// This function is called each time by Bullet and set the current position of body
/// inside the physics world.
/// Don't allow Godot rendering scene takes world transform from this object because
/// the correct transform is set by Bullet only after the last step when there are sub steps
/// This function must update Godot transform rendering scene for this object.
virtual void setWorldTransform(const btTransform &worldTrans) {
bodyCurrentWorldTransform = worldTrans;
owner->notify_transform_changed();
}
public:
/// Use this function to move kinematic body
/// -- or set initial transform before body creation.
void moveBody(const btTransform &newWorldTransform) {
bodyKinematicWorldTransf = newWorldTransform;
}
/// It returns the current body transform from last Bullet update
const btTransform &getCurrentWorldTransform() const {
return bodyCurrentWorldTransform;
}
};
#endif // GODOT_MOTION_STATE_H