src/badguy/flyingsnowball.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program 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 //  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "badguy/flyingsnowball.hpp"
  18
  19 #include "math/random_generator.hpp"
  20 #include "object/sprite_particle.hpp"
  21 #include "object/player.hpp"
  22 #include "supertux/object_factory.hpp"
  23 #include "supertux/sector.hpp"
  24
  25 namespace {
  26 const float PUFF_INTERVAL_MIN = 4.0f; /**< spawn new puff of smoke at most that often */
  27 const float PUFF_INTERVAL_MAX = 8.0f; /**< spawn new puff of smoke at least that often */
  28 }
  29
  30 FlyingSnowBall::FlyingSnowBall(const Reader& reader) :
  31   BadGuy(reader, "images/creatures/flying_snowball/flying_snowball.sprite"),
  32   normal_propeller_speed(),
  33   puff_timer()
  34 {
  35   physic.enable_gravity(true);
  36 }
  37
  38 FlyingSnowBall::FlyingSnowBall(const Vector& pos) :
  39   BadGuy(pos, "images/creatures/flying_snowball/flying_snowball.sprite"),
  40   normal_propeller_speed(),
  41   puff_timer()
  42 {
  43   physic.enable_gravity(true);
  44 }
  45
  46 void
  47 FlyingSnowBall::initialize()
  48 {
  49   sprite->set_action(dir == LEFT ? "left" : "right");
  50 }
  51
  52 void
  53 FlyingSnowBall::activate()
  54 {
  55   puff_timer.start(systemRandom.randf(PUFF_INTERVAL_MIN, PUFF_INTERVAL_MAX));
  56   normal_propeller_speed = systemRandom.randf(0.95, 1.05);
  57 }
  58
  59 bool
  60 FlyingSnowBall::collision_squished(GameObject& object)
  61 {
  62   sprite->set_action(dir == LEFT ? "squished-left" : "squished-right");
  63   physic.set_acceleration_y(0);
  64   physic.set_velocity_y(0);
  65   kill_squished(object);
  66   return true;
  67 }
  68
  69 void
  70 FlyingSnowBall::collision_solid(const CollisionHit& hit)
  71 {
  72   if(hit.top || hit.bottom) {
  73     physic.set_velocity_y(0);
  74   }
  75 }
  76
  77 void
  78 FlyingSnowBall::active_update(float elapsed_time)
  79 {
  80
  81   const float grav = Sector::current()->get_gravity() * 100.0f;
  82   if (get_pos().y > start_position.y + 2*32) {
  83
  84     // Flying too low - increased propeller speed
  85     physic.set_acceleration_y(-grav*1.2);
  86
  87     physic.set_velocity_y(physic.get_velocity_y() * 0.99);
  88
  89   } else if (get_pos().y < start_position.y - 2*32) {
  90
  91     // Flying too high - decreased propeller speed
  92     physic.set_acceleration_y(-grav*0.8);
  93
  94     physic.set_velocity_y(physic.get_velocity_y() * 0.99f);
  95
  96   } else {
  97
  98     // Flying at acceptable altitude - normal propeller speed
  99     physic.set_acceleration_y(-grav*normal_propeller_speed);
 100
 101   }
 102
 103   movement=physic.get_movement(elapsed_time);
 104
 105   Player* player = this->get_nearest_player();
 106   if (player) {
 107     dir = (player->get_pos().x > get_pos().x) ? RIGHT : LEFT;
 108     sprite->set_action(dir == LEFT ? "left" : "right");
 109   }
 110
 111   // spawn smoke puffs
 112   if (puff_timer.check()) {
 113     Vector ppos = bbox.get_middle();
 114     Vector pspeed = Vector(systemRandom.randf(-10, 10), 150);
 115     Vector paccel = Vector(0,0);
 116     Sector::current()->add_object(new SpriteParticle("images/objects/particles/smoke.sprite", "default", ppos, ANCHOR_MIDDLE, pspeed, paccel, LAYER_OBJECTS-1));
 117     puff_timer.start(systemRandom.randf(PUFF_INTERVAL_MIN, PUFF_INTERVAL_MAX));
 118
 119     normal_propeller_speed = systemRandom.randf(0.95, 1.05);
 120     physic.set_velocity_y(physic.get_velocity_y() - 50);
 121   }
 122 }
 123
 124 IMPLEMENT_FACTORY(FlyingSnowBall, "flyingsnowball");
 125
 126 /* EOF */