src/badguy/flyingsnowball.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23
  24 #include "flyingsnowball.hpp"
  25
  26 #include "random_generator.hpp"
  27 #include "object/sprite_particle.hpp"
  28 #include "lisp/writer.hpp"
  29 #include "object_factory.hpp"
  30 #include "sector.hpp"
  31
  32 namespace {
  33   const float PUFF_INTERVAL_MIN = 4.0f; /**< spawn new puff of smoke at most that often */
  34   const float PUFF_INTERVAL_MAX = 8.0f; /**< spawn new puff of smoke at least that often */
  35 }
  36
  37 FlyingSnowBall::FlyingSnowBall(const lisp::Lisp& reader)
  38         : BadGuy(reader, "images/creatures/flying_snowball/flying_snowball.sprite")
  39 {
  40   physic.enable_gravity(true);
  41 }
  42
  43 FlyingSnowBall::FlyingSnowBall(const Vector& pos)
  44         : BadGuy(pos, "images/creatures/flying_snowball/flying_snowball.sprite")
  45 {
  46   physic.enable_gravity(true);
  47 }
  48
  49 void
  50 FlyingSnowBall::write(lisp::Writer& writer)
  51 {
  52   writer.start_list("flyingsnowball");
  53
  54   writer.write("x", start_position.x);
  55   writer.write("y", start_position.y);
  56
  57   writer.end_list("flyingsnowball");
  58 }
  59
  60 void
  61 FlyingSnowBall::initialize()
  62 {
  63   sprite->set_action(dir == LEFT ? "left" : "right");
  64 }
  65
  66 void
  67 FlyingSnowBall::activate()
  68 {
  69   puff_timer.start(systemRandom.randf(PUFF_INTERVAL_MIN, PUFF_INTERVAL_MAX));
  70   normal_propeller_speed = systemRandom.randf(0.95, 1.05);
  71 }
  72
  73 bool
  74 FlyingSnowBall::collision_squished(GameObject& object)
  75 {
  76   sprite->set_action(dir == LEFT ? "squished-left" : "squished-right");
  77   physic.set_acceleration_y(0);
  78   physic.set_velocity_y(0);
  79   kill_squished(object);
  80   return true;
  81 }
  82
  83 void
  84 FlyingSnowBall::collision_solid(const CollisionHit& hit)
  85 {
  86   if(hit.top || hit.bottom) {
  87     physic.set_velocity_y(0);
  88   }
  89 }
  90
  91 void
  92 FlyingSnowBall::active_update(float elapsed_time)
  93 {
  94
  95   const float grav = physic.get_gravity()*100;
  96   if (get_pos().y > start_position.y + 2*32) {
  97
  98     // Flying too low - increased propeller speed
  99     physic.set_acceleration_y(-grav*1.2);
 100
 101     physic.set_velocity_y(physic.get_velocity_y() * 0.99);
 102
 103   } else if (get_pos().y < start_position.y - 2*32) {
 104
 105     // Flying too high - decreased propeller speed
 106     physic.set_acceleration_y(-grav*0.8);
 107
 108     physic.set_velocity_y(physic.get_velocity_y() * 0.99);
 109
 110   } else {
 111
 112     // Flying at acceptable altitude - normal propeller speed
 113     physic.set_acceleration_y(-grav*normal_propeller_speed);
 114
 115   }
 116
 117   movement=physic.get_movement(elapsed_time);
 118
 119   Player* player = this->get_nearest_player();
 120   if (player) {
 121     dir = (player->get_pos().x > get_pos().x) ? RIGHT : LEFT;
 122     sprite->set_action(dir == LEFT ? "left" : "right");
 123   }
 124
 125   // spawn smoke puffs
 126   if (puff_timer.check()) {
 127     Vector ppos = bbox.get_middle();
 128     Vector pspeed = Vector(systemRandom.randf(-10, 10), 150);
 129     Vector paccel = Vector(0,0);
 130     Sector::current()->add_object(new SpriteParticle("images/objects/particles/smoke.sprite", "default", ppos, ANCHOR_MIDDLE, pspeed, paccel, LAYER_OBJECTS-1));
 131     puff_timer.start(systemRandom.randf(PUFF_INTERVAL_MIN, PUFF_INTERVAL_MAX));
 132
 133     normal_propeller_speed = systemRandom.randf(0.95, 1.05);
 134     physic.set_velocity_y(physic.get_velocity_y() - 50);
 135   }
 136 }
 137
 138 IMPLEMENT_FACTORY(FlyingSnowBall, "flyingsnowball")