src/mods/sandbox/planet.cpp

   1 /************************************************************************
   2     This file is part of NE.
   3
   4     NE is free software: you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation, either version 3 of the License, or
   7     (at your option) any later version.
   8
   9     NE is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with NE.  If not, see <http://www.gnu.org/licenses/>.
  16 ************************************************************************/
  17
  18 #include "planet.h"
  19
  20 using namespace SandBox;
  21
  22 Planet::Planet(Texture *texture, float radius, float density) : Sphere(radius,density), m_tex(texture)
  23 {
  24
  25 }
  26
  27 Planet::~Planet()
  28 {
  29 }
  30
  31 void Planet::draw()
  32 {
  33         m_tex->apply();
  34         Sphere::draw();
  35 }
  36
  37 const Vec3f Planet::getGravity(Object *target)
  38 {
  39         static float v[4];
  40
  41         Vec3f pos1 = getPositionV();
  42
  43         Vec3f pos2 = Vec3f::FromODE(target->getPosition());
  44
  45         Vec3f del = pos1 - pos2;
  46
  47         float r2 = del.dot(del);
  48
  49         float n = 1.0 / sqrt(r2);
  50
  51         Vec3f dir = del * n;
  52
  53         dReal m1 = getMass();
  54         dReal m2 = target->getMass();
  55
  56         dReal g = m1 * m2 / r2;
  57
  58         return Vec3f(dir * g);
  59 }
  60
  61 void Planet::applyGravity(Object *target)
  62 {
  63         if (!target->getBody()->isEnabled()) return;
  64
  65         Vec3f grav = getGravity(target);
  66
  67         target->applyGravity(grav);
  68 }