From 47ab536b3f0f77cb6c92ac66a072a104749b1f87 Mon Sep 17 00:00:00 2001
From: Ricardo Cruz <rick2@aeiou.pt>
Date: Mon, 3 May 2004 12:34:37 +0000
Subject: [PATCH] Added back scrolling! It is only enabled if the level
 explicity asks for.

SVN-Revision: 939
---
 src/level.cpp  |  8 ++++++++
 src/level.h    |  1 +
 src/player.cpp | 43 ++++---------------------------------------
 src/player.h   |  2 +-
 src/world.cpp  | 23 +++++++++++++++++++++++
 src/world.h    |  1 +
 6 files changed, 38 insertions(+), 40 deletions(-)

diff --git a/src/level.cpp b/src/level.cpp
index d8880da24..15e258c0c 100644
--- a/src/level.cpp
+++ b/src/level.cpp
@@ -237,6 +237,7 @@ Level::init_defaults()
   start_pos_y = 170;
   time_left  = 100;
   gravity    = 10.;
+  back_scrolling = false;
   bkgd_top.red   = 0;
   bkgd_top.green = 0;
   bkgd_top.blue  = 0;
@@ -311,6 +312,9 @@ Level::load(const std::string& filename)
       if(!reader.read_int("time",  &time_left)) {
         printf("Warning no time specified for level.\n");
       }
+      
+      back_scrolling = false;
+      reader.read_bool("back_scrolling",  &back_scrolling);
 
       bkgd_top.red = bkgd_top.green = bkgd_top.blue = 0;
       reader.read_int("bkgd_red_top",  &bkgd_top.red);
@@ -551,6 +555,10 @@ Level::save(const std::string& subset, int level)
   fprintf(fi,"  (bkgd_blue_bottom %d)\n", bkgd_bottom.blue);
   fprintf(fi,"  (time %d)\n", time_left);
   fprintf(fi,"  (width %d)\n", width);
+  if(back_scrolling)
+    fprintf(fi,"  (back_scrolling 1)\n"); 
+  else
+    fprintf(fi,"  (back_scrolling 0)\n");
   fprintf(fi,"  (gravity %2.1f)\n", gravity);
   fprintf(fi,"  (background-tm ");
 
diff --git a/src/level.h b/src/level.h
index 682cbe6c9..8ba3fd05a 100644
--- a/src/level.h
+++ b/src/level.h
@@ -89,6 +89,7 @@ class Level
   int start_pos_x;
   int start_pos_y;
   float gravity;
+  bool back_scrolling;
 
   std::vector<BadGuyData> badguy_data;
 
diff --git a/src/player.cpp b/src/player.cpp
index d6f60e98b..401055147 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -191,7 +191,7 @@ Player::action(double frame_ratio)
           base.x += frame_ratio * WALK_SPEED * (dir ? 1 : -1);
           previous_base = old_base = base;
         }
-      keep_in_bounds();
+      check_bounds();
 
       // Land:
       if (!on_ground())
@@ -734,20 +734,14 @@ Player::remove_powerups()
 }
 
 void
-Player::keep_in_bounds()
+Player::check_bounds()
 {
-  Level* plevel = World::current()->get_level();
-
   /* Keep tux in bounds: */
   if (base.x < 0)
     { // Lock Tux to the size of the level, so that he doesn't fall of
       // on the left side
       base.x = 0;
     }
-  else if (base.x < scroll_x)
-    { 
-      base.x = scroll_x;
-    }
 
   /* Keep in-bounds, vertically: */
   if (base.y > screen->h)
@@ -755,37 +749,8 @@ Player::keep_in_bounds()
       kill(KILL);
     }
 
-  int scroll_threshold = screen->w/2 - 80;
-  if (debug_mode)
-    {
-      scroll_x += screen->w/2;
-      // Backscrolling for debug mode
-      if (scroll_x < base.x - 80)
-        scroll_x = base.x - 80;
-      else if (scroll_x > base.x + 80)
-        scroll_x = base.x + 80;
-      scroll_x -= screen->w/2;
-
-      if(scroll_x < 0)
-        scroll_x = 0;
-    }
-  else
-    {
-      if (base.x > scroll_threshold + scroll_x
-          && scroll_x < ((World::current()->get_level()->width * 32) - screen->w))
-        {
-          // FIXME: Scrolling needs to be handled by a seperate View
-          // class, doing it as a player huck is ugly
-          
-          // Scroll the screen in past center:
-          scroll_x = base.x - scroll_threshold;
-          
-          // Lock the scrolling to the levelsize, so that we don't
-          // scroll over the right border
-          if (scroll_x > 32 * plevel->width - screen->w)
-            scroll_x = 32 * plevel->width - screen->w;
-        }
-    }
+  if(base.x < scroll_x)  // can happen if back scrolling is disabled
+    base.x = scroll_x;
 }
 
 // EOF //
diff --git a/src/player.h b/src/player.h
index 7eb858e6a..e3c8a0e01 100644
--- a/src/player.h
+++ b/src/player.h
@@ -144,7 +144,7 @@ public:
   void is_dying();
   bool is_dead();
   void player_remove_powerups();
-  void keep_in_bounds();
+  void check_bounds();
   bool on_ground();
   bool under_solid();
   void grow();
diff --git a/src/world.cpp b/src/world.cpp
index 94a398fc8..9e4b843cb 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -257,6 +257,7 @@ void
 World::action(double frame_ratio)
 {
   tux.action(frame_ratio);
+  keep_in_bounds();
 
   /* Handle bouncy distros: */
   for (unsigned int i = 0; i < bouncy_distros.size(); i++)
@@ -304,6 +305,28 @@ World::action(double frame_ratio)
   }
 }
 
+// the space that it takes for the screen to start scrolling
+#define X_SPACE 80
+
+/* This functions takes cares of the scrolling */
+void World::keep_in_bounds()
+{
+int tux_pos_x = (int)(tux.base.x - (tux.base.width/2));
+
+scroll_x += screen->w/2;
+
+if (scroll_x < tux_pos_x - X_SPACE)
+  scroll_x = tux_pos_x - X_SPACE;
+else if (scroll_x > tux_pos_x + X_SPACE && level->back_scrolling)
+  scroll_x = tux_pos_x + X_SPACE;
+
+scroll_x -= screen->w/2;
+
+if(scroll_x < 0)
+  scroll_x = 0;
+}
+
+
 void
 World::collision_handler()
 {
diff --git a/src/world.h b/src/world.h
index 591d30576..57d803d16 100644
--- a/src/world.h
+++ b/src/world.h
@@ -76,6 +76,7 @@ public:
 
   void draw();
   void action(double frame_ratio);
+  void keep_in_bounds();
 
   void play_music(int musictype);
   int get_music_type();
-- 
2.11.0