1 files changed, 87 insertions, 0 deletions
diff --git a/kue/billiard.cpp b/kue/billiard.cpp
new file mode 100644
index 00000000..7237d7f8
--- /dev/null
+++ b/kue/billiard.cpp
@@ -0,0 +1,87 @@
+#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;
+}