Add Falling Platforms (#1469)

* Add fallblocks

[ci skip]

* Update game object factory [ci skip]

* Add images [ci skip]

* Update objects file

* update due to review

* Delete cave-5x8.png

[ci skip]

data/images/engine/editor/objects.stoi

@@ -225,6 +225,9 @@
   (object
     (class "hurting_platform")
     (icon "images/objects/sawblade/default-0.png"))
+  (object
+    (class "fallblock")
+    (icon "images/objects/fallblock/cave-4x4.png"))
   (object
     (class "scriptedobject")
     (icon "images/engine/editor/scriptedobject.png"))

data/images/objects/fallblock/branchleft.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 123 32)
+    (images "branchleft.png")
+  )
+)

data/images/objects/fallblock/branchright.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 5 32 123 32)
+    (images "branchright.png")
+  )
+)

data/images/objects/fallblock/cave-2x3.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 64 96)
+    (images "cave-2x3.png")
+  )
+)

data/images/objects/fallblock/cave-3x2.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 96 64)
+    (images "cave-3x2.png")
+  )
+)

data/images/objects/fallblock/cave-3x4.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 96 128)
+    (images "cave-3x4.png")
+  )
+)

data/images/objects/fallblock/cave-4x3.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 128 96)
+    (images "cave-4x3.png")
+  )
+)

data/images/objects/fallblock/cave-4x4.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 128 128)
+    (images "cave-4x4.png")
+  )
+)

data/images/objects/fallblock/cave-4x6.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 128 192)
+    (images "cave-4x6.png")
+  )
+)

data/images/objects/fallblock/cave-5x3.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 160 96)
+    (images "cave-5x3.png")
+  )
+)

data/images/objects/fallblock/cave-5x7.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 160 224)
+    (images "cave-5x7.png")
+  )
+)

data/images/objects/fallblock/cave-6x4.sprite

@@ -0,0 +1,7 @@
+(supertux-sprite
+  (action
+    (name "normal")
+    (hitbox 0 32 192 128)
+    (images "cave-6x4.png")
+  )
+)

src/object/fallblock.cpp

@@ -0,0 +1,137 @@
+//  Copyright (C) 2020 Daniel Ward <weluvgoatz@gmail.com>
+//
+//  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 3 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.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "object/fallblock.hpp"
+
+#include "audio/sound_manager.hpp"
+#include "object/player.hpp"
+#include "object/camera.hpp"
+#include "sprite/sprite.hpp"
+#include "supertux/sector.hpp"
+#include "supertux/tile.hpp"
+#include "math/random.hpp"
+#include "util/reader_mapping.hpp"
+
+FallBlock::FallBlock(const ReaderMapping& reader) :
+  MovingSprite(reader, "images/objects/fallblock/cave-4x4.sprite", LAYER_OBJECTS, COLGROUP_STATIC),
+  state(IDLE),
+  physic(),
+  timer()
+{
+	SoundManager::current()->preload("sounds/cracking.wav");
+	SoundManager::current()->preload("sounds/thud.ogg");
+	physic.enable_gravity(false);
+}
+
+void
+FallBlock::update(float dt_sec)
+{
+  switch (state)
+  {
+    case IDLE:
+			set_group(COLGROUP_STATIC);
+	    if (found_victim_down())
+		  {
+        state = SHAKE;
+	      SoundManager::current()->play("sounds/cracking.wav");
+	      timer.start(0.5f);
+		  }
+      break;
+    case SHAKE:
+	    if (timer.check())
+      {
+        state = FALL;
+	      physic.reset();
+		    physic.enable_gravity(true);
+      }
+      break;
+    case FALL:
+      m_col.m_movement = physic.get_movement (dt_sec);
+      set_group(COLGROUP_MOVING_STATIC);
+      break;
+    case LAND:
+      m_col.m_movement = physic.get_movement (dt_sec);
+	    set_group(COLGROUP_MOVING_STATIC);
+      break;
+  }
+}
+
+HitResponse
+FallBlock::collision(GameObject& other, const CollisionHit& hit)
+{
+	auto fallblock = dynamic_cast<FallBlock*> (&other);
+  if (fallblock && hit.bottom && (state == FALL || state == LAND))
+  {
+	  physic.set_velocity_y(0.0f);
+	  return CONTINUE;
+  }
+
+	auto player = dynamic_cast<Player*>(&other);
+	if (state == IDLE && player && player->get_bbox().get_bottom() < m_col.m_bbox.get_top())
+  {
+	  state = SHAKE;
+	  SoundManager::current()->play("sounds/cracking.wav");
+	  timer.start(0.5f);
+	}
+	return FORCE_MOVE;
+}
+
+void
+FallBlock::collision_solid(const CollisionHit& hit)
+{
+  if (hit.top || hit.bottom || hit.crush)
+  {
+    physic.set_velocity(0.0f, 0.0f);
+  }
+
+  if (state == FALL && hit.bottom)
+  {
+    Sector::get().get_camera().shake(0.125f, 0.0f, 10.0f);
+    SoundManager::current()->play("sounds/thud.ogg");
+    state = LAND;
+  }
+}
+
+void
+FallBlock::draw(DrawingContext& context)
+{
+  Vector pos = get_pos();
+  // shaking
+  if (state == SHAKE && state != IDLE && state != FALL && state != LAND)
+  {
+    pos.x += static_cast<float>(graphicsRandom.rand(-8.0f, 8.0f));
+	  pos.y += static_cast<float>(graphicsRandom.rand(-5.0f, 5.0f));
+  }
+  m_sprite->draw(context.color(), pos, m_layer);
+}
+
+bool
+FallBlock::found_victim_down() const
+{
+  if (auto* player = Sector::get().get_nearest_player(m_col.m_bbox))
+  {
+    const Rectf& player_bbox = player->get_bbox();
+    Rectf crush_area_down = Rectf(m_col.m_bbox.get_left()+1, m_col.m_bbox.get_bottom(),
+                                  m_col.m_bbox.get_right()-1, std::max(m_col.m_bbox.get_bottom(),player_bbox.get_top()-1));
+    if ((player_bbox.get_top() >= m_col.m_bbox.get_bottom())
+        && (player_bbox.get_right() > (m_col.m_bbox.get_left() - 4))
+        && (player_bbox.get_left() < (m_col.m_bbox.get_right() + 4))
+        && (Sector::get().is_free_of_statics(crush_area_down, this, false)))
+    {
+      return true;
+    }
+  }
+  return false;
+}

src/object/fallblock.hpp

@@ -0,0 +1,65 @@
+//  Copyright (C) 2020 Daniel Ward <weluvgoatz@gmail.com>
+//
+//  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 3 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.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef HEADER_SUPERTUX_OBJECT_FALLBLOCK_HPP
+#define HEADER_SUPERTUX_OBJECT_FALLBLOCK_HPP
+
+#include "object/moving_sprite.hpp"
+#include "supertux/physic.hpp"
+#include "supertux/timer.hpp"
+
+class Player;
+
+class FallBlock : public MovingSprite
+
+{
+public:
+  FallBlock(const ReaderMapping& reader);
+
+  virtual void update(float dt_sec) override;
+
+  virtual HitResponse collision(GameObject& other, const CollisionHit& hit) override;
+  virtual void collision_solid(const CollisionHit& hit) override;
+
+  virtual void draw(DrawingContext& context) override;
+
+  virtual std::string get_class() const override { return "fallblock"; }
+  virtual std::string get_display_name() const override { return _("Falling Platform"); }
+
+protected:
+  enum State
+  {
+    IDLE,
+    SHAKE,
+    FALL,
+    LAND
+  };
+
+private:
+  State state;
+
+  Physic physic;
+  Timer timer;
+
+  bool found_victim_down() const;
+
+private:
+  FallBlock(const FallBlock&) = delete;
+  FallBlock& operator=(const FallBlock&) = delete;
+};
+
+#endif
+
+/* EOF */

src/supertux/game_object_factory.cpp

@@ -81,6 +81,7 @@
 #include "object/coin.hpp"
 #include "object/decal.hpp"
 #include "object/explosion.hpp"
+#include "object/fallblock.hpp"
 #include "object/firefly.hpp"
 #include "object/ghost_particle_system.hpp"
 #include "object/gradient.hpp"
@@ -212,6 +213,7 @@ GameObjectFactory::init_factories()
   add_factory<Coin>("coin");
   add_factory<Decal>("decal");
   add_factory<Explosion>("explosion");
+  add_factory<FallBlock>("fallblock");
   add_factory<Firefly>("firefly");
   add_factory<GhostParticleSystem>("particles-ghosts");
   add_factory<Gradient>("gradient");