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#include "billiard.h"
#include "graphics.h"
#include <math.h>
#include <tqstring.h>
#include <kdebug.h>
const double FRICTIONAL_FORCE = 0.025;
KueBilliard::KueBilliard(double x, double y, double r, const KueTexture &texture) : circle(x, y, r), _texture(texture)
{
}
KueBilliard::~KueBilliard()
{
}
void KueBilliard::step(double seconds)
{
double delta_x;
double delta_y;
if (isStopped())
return;
vector new_velocity = _velocity - (FRICTIONAL_FORCE * seconds);
if (new_velocity.magnitude() < 0.0)
new_velocity.setMagnitude(0.0);
delta_x = (_velocity.componentX() + new_velocity.componentX()) / 2.0 * seconds;
delta_y = (_velocity.componentY() + new_velocity.componentY()) / 2.0 * seconds;
_pos_x += delta_x;
_pos_y += delta_y;
_velocity = new_velocity;
}
bool KueBilliard::isStopped()
{
return (_velocity.magnitude() == 0.0);
}
void KueBilliard::reflect(double normal)
{
_velocity.setDirection(M_PI - (_velocity.direction()) + (normal * 2.0));
}
void KueBilliard::collide(KueBilliard &b) {
_velocity -= b._velocity;
double mv = _velocity.magnitude();
vector unit1 = vector(*this, b);
unit1 = unit1.unit();
vector unit2 = _velocity.unit();
double cos = unit1 * unit2;
unit1 *= mv * cos;
_velocity -= unit1;
_velocity += b._velocity;
b._velocity += unit1;
}
vector& KueBilliard::velocity()
{
return _velocity;
}
void KueBilliard::setVelocity(const vector &velocity)
{
_velocity = velocity;
}
KueTexture& KueBilliard::texture()
{
return _texture;
}
void KueBilliard::setTexture(const KueTexture &texture)
{
_texture = texture;
}
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