From 21fcbb8870e735ca14d1278f31e4997a823024c7 Mon Sep 17 00:00:00 2001
From: Ricardo Cruz <rick2@aeiou.pt>
Date: Tue, 4 May 2004 13:59:00 +0000
Subject: [PATCH] Made it possible for Tux to be in a position before the half
 of the screen. Started implementing a moving camera, but it isn't working
 very well, i'll have a look at it later.

SVN-Revision: 968
---
 src/player.cpp |  3 +++
 src/player.h   |  1 +
 src/world.cpp  | 42 +++++++++++++++++++++++++++++++++++-------
 src/world.h    |  5 ++++-
 4 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/src/player.cpp b/src/player.cpp
index 401055147..617b48d83 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -78,6 +78,7 @@ Player::init()
   base.ym = 0;
   previous_base = old_base = base;
   dir = RIGHT;
+  old_dir = dir;
   duck = false;
 
   dying   = DYING_NOT;
@@ -295,9 +296,11 @@ Player::handle_horizontal_input()
 
   float dirsign = 0;
   if(input.left == DOWN && input.right == UP && (!duck || physic.get_velocity_y() != 0)) {
+      old_dir = dir;
       dir = LEFT;
       dirsign = -1;
   } else if(input.left == UP && input.right == DOWN && (!duck || physic.get_velocity_y() != 0)) {
+      old_dir = dir;
       dir = RIGHT;
       dirsign = 1;
   }
diff --git a/src/player.h b/src/player.h
index e3c8a0e01..a92855612 100644
--- a/src/player.h
+++ b/src/player.h
@@ -117,6 +117,7 @@ public:
   DyingType dying;
 
   Direction dir;
+  Direction old_dir;
 
   bool jumping;
   bool can_jump;
diff --git a/src/world.cpp b/src/world.cpp
index 0bf61f437..972f292e4 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -54,6 +54,8 @@ World::World(const std::string& filename)
   get_level()->load_song();
 
   apply_bonuses();
+
+  scrolling_timer.init(true);
 }
 
 World::World(const std::string& subset, int level_nr)
@@ -73,6 +75,8 @@ World::World(const std::string& subset, int level_nr)
   get_level()->load_song();
 
   apply_bonuses();
+
+  scrolling_timer.init(true);
 }
 
 void
@@ -257,7 +261,7 @@ void
 World::action(double frame_ratio)
 {
   tux.action(frame_ratio);
-  keep_in_bounds();
+  scrolling();
 
   /* Handle bouncy distros: */
   for (unsigned int i = 0; i < bouncy_distros.size(); i++)
@@ -307,17 +311,41 @@ World::action(double frame_ratio)
 
 // the space that it takes for the screen to start scrolling, regarding
 // screen bounds (in pixels)
-#define X_SPACE 160
+#define X_SPACE 380
+// the time it takes to move the camera (in ms)
+#define CHANGE_DIR_SCROLL_SPEED 2000
 
 /* This functions takes cares of the scrolling */
-void World::keep_in_bounds()
+void World::scrolling()
 {
   int tux_pos_x = (int)(tux.base.x + (tux.base.width/2));
 
-  if (scroll_x < tux_pos_x - (screen->w - X_SPACE))
-    scroll_x = tux_pos_x - (screen->w - X_SPACE);
-  else if (scroll_x > tux_pos_x - X_SPACE && level->back_scrolling)
-    scroll_x = tux_pos_x - X_SPACE;
+  if(tux.old_dir != tux.dir && (level->back_scrolling || debug_mode))
+    scrolling_timer.start(CHANGE_DIR_SCROLL_SPEED);
+    
+  if(scrolling_timer.check())
+    {
+    float final_scroll_x;
+    if (tux.dir == RIGHT)
+      final_scroll_x = tux_pos_x - (screen->w - X_SPACE);
+    else// if (tux.dir == LEFT)// && )
+      final_scroll_x = tux_pos_x - X_SPACE;
+
+    if(moved_scroll_x == 0)
+      moved_scroll_x = scroll_x;
+
+    scroll_x += (final_scroll_x - scroll_x) / (CHANGE_DIR_SCROLL_SPEED);
+    }
+
+  else
+    {
+    moved_scroll_x = 0;
+
+    if (tux.dir == RIGHT && scroll_x < tux_pos_x - (screen->w - X_SPACE))
+      scroll_x = tux_pos_x - (screen->w - X_SPACE);
+    else if (tux.dir == LEFT && scroll_x > tux_pos_x - X_SPACE && (level->back_scrolling || debug_mode))
+      scroll_x = tux_pos_x - X_SPACE;
+    }
 
   if(scroll_x < 0)
     scroll_x = 0;
diff --git a/src/world.h b/src/world.h
index 57d803d16..c8716888a 100644
--- a/src/world.h
+++ b/src/world.h
@@ -44,6 +44,9 @@ private:
   Level* level;
   Player tux;
 
+  Timer scrolling_timer;
+  float moved_scroll_x;
+
   int distro_counter;
   bool counting_distros;
   int currentmusic;
@@ -76,7 +79,7 @@ public:
 
   void draw();
   void action(double frame_ratio);
-  void keep_in_bounds();
+  void scrolling();   // camera scrolling
 
   void play_music(int musictype);
   int get_music_type();
-- 
2.11.0