Add new bouncing snowball sprite

data/images/creatures/bouncing_snowball/bouncing_snowball.sprite

@@ -1,19 +1,62 @@
 (supertux-sprite
  (action
   (name "left")
-  (hitbox 1 0 31.8 31.8)
-  (images "left-0.png"
-          "left-1.png"
-          "left-2.png"
-          "left-3.png"
-          "left-4.png"
-          "left-5.png"))
+  (hitbox 17 14 31 31)
+  (fps 20)
+  (images "bs1.png"
+          "bs2.png"
+          "bs3.png"
+          "bs4.png"
+          "bs5.png"
+          "bs6.png"
+		  "bs7.png"
+		  "bs8.png"
+		  "bs8.png"
+		  "bs8.png"
+		  "bs8.png"
+		  "bs8.png"))
 
  (action
   (name "right")
-  (hitbox 1 0 31.8 31.8)
+  (hitbox 17 14 31 31)
+  (fps 20)
   (mirror-action "left"))
 
+ (action
+  (name "left-down")
+  (loops 1)
+  (hitbox 17 14 31 31)
+  (fps 30)
+  (images "bs8.png"
+		  "bounce1.png"
+		  "bounce2.png"
+		  "bounce3.png"))
+
+ (action
+  (name "right-down")
+  (loops 1)
+  (hitbox 17 14 31 31)
+  (fps 30)
+  (mirror-action "left-down"))
+
+ (action
+  (name "left-up")
+  (loops 1)
+  (hitbox 17 14 31 31)
+  (fps 30)
+  (images "bounce3.png"
+		  "bounce3.png"
+		  "bounce2.png"
+		  "bounce1.png"
+		  "bs8.png"))
+
+ (action
+  (name "right-up")
+  (loops 1)
+  (hitbox 17 14 31 31)
+  (fps 30)
+  (mirror-action "left-up"))
+
  (action
   (name "melting-left")
   (fps 20)

src/badguy/bouncing_snowball.cpp

@@ -17,6 +17,7 @@
 #include "badguy/bouncing_snowball.hpp"
 
 #include "sprite/sprite.hpp"
+#include "supertux/sector.hpp"
 
 #include <algorithm>
 
@@ -35,6 +36,28 @@ BouncingSnowball::initialize()
   m_sprite->set_action(m_dir == Direction::LEFT ? "left" : "right");
 }
 
+void
+BouncingSnowball::active_update(float dt_sec)
+{
+  BadGuy::active_update(dt_sec);
+  if ((m_sprite->get_action() == "left-up" || m_sprite->get_action() == "right-up") && m_sprite->animation_done())
+  {
+    m_sprite->set_action(m_dir == Direction::LEFT ? "left" : "right");
+  }
+  Rectf lookbelow = get_bbox();
+  lookbelow.set_bottom(lookbelow.get_bottom() + 48);
+  lookbelow.set_top(lookbelow.get_top() + 31);
+  bool groundBelow = !Sector::get().is_free_of_statics(lookbelow);
+  if (groundBelow && (m_physic.get_velocity_y() >= 64.0f))
+  {
+    m_sprite->set_action(m_dir == Direction::LEFT ? "left-down" : "right-down");
+  }
+  if (!groundBelow && (m_sprite->get_action() == "left-down" || m_sprite->get_action() == "right-down"))
+  {
+    m_sprite->set_action(m_dir == Direction::LEFT ? "left" : "right");
+  }
+}
+
 bool
 BouncingSnowball::collision_squished(GameObject& object)
 {
@@ -55,6 +78,7 @@ BouncingSnowball::collision_solid(const CollisionHit& hit)
     if (get_state() == STATE_ACTIVE) {
       float bounce_speed = -m_physic.get_velocity_y()*0.8f;
       m_physic.set_velocity_y(std::min(JUMPSPEED, bounce_speed));
+	    m_sprite->set_action(m_dir == Direction::LEFT ? "left-up" : "right-up", /* loops = */ 1);
     } else {
       m_physic.set_velocity_y(0);
     }

src/badguy/bouncing_snowball.hpp

@@ -25,6 +25,7 @@ class BouncingSnowball final : public BadGuy
   BouncingSnowball(const ReaderMapping& reader);
 
   virtual void initialize() override;
+  virtual void active_update(float) override;
   virtual void collision_solid(const CollisionHit& hit) override;
   virtual HitResponse collision_badguy(BadGuy& badguy, const CollisionHit& hit) override;
   virtual std::string get_class() const override { return "bouncingsnowball"; }