[ Patch #1793 ] Turn physic into POD

[supertux.git] / src / physic.cpp

diff --git a/src/physic.cpp b/src/physic.cpp
index 232475d..84eb892 100644 (file)
--- a/src/physic.cpp
+++ b/src/physic.cpp
@@ -1,95 +1,43 @@
+//  $Id$
 //
-// C Implementation: physic
+//  SuperTux
+//  Copyright (C) 2004 Tobias Glaesser <tobi.web@gmx.de>
+//  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
 //
-// Description:
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
 //
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
 //
-// Author: Tobias Glaesser <tobi.web@gmx.de>, (C) 2004
-//
-// Copyright: See COPYING file that comes with this distribution
-//
-//
-#include <stdio.h>
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+//  02111-1307, USA.
+#include <config.h>
 
-#include "scene.h"
-#include "defines.h"
-#include "physic.h"
-#include "timer.h"
-#include "world.h"
-#include "level.h"
+#include "physic.hpp"
 
 Physic::Physic()
-    : ax(0), ay(0), vx(0), vy(0), gravity_enabled(true)
-{
-}
-
-Physic::~Physic()
+    : ax(0), ay(0), vx(0), vy(0), gravity_enabled(true), gravity(1000)
 {
 }
 
-void
-Physic::reset()
+Vector
+Physic::get_movement(float elapsed_time)
 {
-    ax = ay = vx = vy = 0;
-    gravity_enabled = true;
-}
+  float grav = gravity_enabled ? gravity : 0;
 
-void
-Physic::set_velocity(float nvx, float nvy)
-{
-    vx = nvx;
-    vy = -nvy;
-}
-
-float
-Physic::get_velocity_x()
-{
-    return vx;
-}
-
-float
-Physic::get_velocity_y()
-{
-    return -vy;
-}
-
-void
-Physic::set_acceleration(float nax, float nay)
-{
-    ax = nax;
-    ay = -nay;
-}
-
-float
-Physic::get_acceleration_x()
-{
-    return ax;
-}
-
-float
-Physic::get_acceleration_y()
-{
-    return -ay;
-}
-
-void
-Physic::enable_gravity(bool enable_gravity)
-{
-  gravity_enabled = enable_gravity;
-}
-
-void
-Physic::apply(float frame_ratio, float &x, float &y)
-{
-  float gravity = World::current()->get_level()->gravity;
-  float grav;
-  if(gravity_enabled)
-    grav = gravity / 100.0;
-  else
-    grav = 0;
+  Vector result(
+      vx * elapsed_time + ax * elapsed_time * elapsed_time,
+      vy * elapsed_time + (ay + grav) * elapsed_time * elapsed_time
+  );
+  vx += ax * elapsed_time;
+  vy += (ay + grav) * elapsed_time;
 
-  x += vx * frame_ratio + ax * frame_ratio * frame_ratio;
-  y += vy * frame_ratio + (ay + grav) * frame_ratio * frame_ratio;
-  vx += ax * frame_ratio;
-  vy += (ay + grav) * frame_ratio;
+  return result;
 }