From 8d72041c32613175e6b7eecd34007dbb402f0b91 Mon Sep 17 00:00:00 2001
From: Ricardo Cruz <rick2@aeiou.pt>
Date: Tue, 11 May 2004 21:53:51 +0000
Subject: [PATCH] First implementation of vertical scrolling.

SVN-Revision: 1111
---
 src/gameobjs.cpp | 10 +++++-----
 src/scene.cpp    |  2 +-
 src/scene.h      |  2 +-
 src/sprite.cpp   |  2 +-
 src/world.cpp    | 18 +++++++++++++++---
 5 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/src/gameobjs.cpp b/src/gameobjs.cpp
index 4909308ad..010cf1d04 100644
--- a/src/gameobjs.cpp
+++ b/src/gameobjs.cpp
@@ -54,7 +54,7 @@ void
 BouncyDistro::draw()
 {
   img_distro[0]->draw(base.x - scroll_x,
-                      base.y);
+                      base.y - scroll_y);
 }
 
 
@@ -98,7 +98,7 @@ BrokenBrick::draw()
   src.h = 16;
 
   dest.x = (int)(base.x - scroll_x);
-  dest.y = (int)base.y;
+  dest.y = (int)(base.y  - scroll_y);
   dest.w = 16;
   dest.h = 16;
   
@@ -147,7 +147,7 @@ BouncyBrick::draw()
       base.x <= scroll_x + screen->w)
     {
       dest.x = (int)(base.x - scroll_x);
-      dest.y = (int)base.y;
+      dest.y = (int)(base.y - scroll_y);
       dest.w = 32;
       dest.h = 32;
 
@@ -157,7 +157,7 @@ BouncyBrick::draw()
       // paint it later at on offseted position
       if(plevel->bkgd_image[0] == '\0')
         {
-          fillrect(base.x - scroll_x, base.y,
+          fillrect(base.x - scroll_x, base.y - scroll_y,
                    32,32, 
                    plevel->bkgd_top.red, plevel->bkgd_top.green, plevel->bkgd_top.blue, 0);
 // FIXME: doesn't respect the gradient, futhermore is this necessary at all??
@@ -170,7 +170,7 @@ BouncyBrick::draw()
         }
 
       Tile::draw(base.x - scroll_x,
-                 base.y + offset,
+                 base.y - scroll_y + offset,
                  shape);
     }
 }
diff --git a/src/scene.cpp b/src/scene.cpp
index d7034a9a0..ccdce0bb4 100644
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -69,7 +69,7 @@ PlayerStatus::BonusType string_to_bonus(const std::string& str)
 }
 
 // FIXME: Move this into a view class
-float scroll_x;
+float scroll_x, scroll_y;
 
 unsigned int global_frame_counter;
 
diff --git a/src/scene.h b/src/scene.h
index 6beaeb657..d2fa82f85 100644
--- a/src/scene.h
+++ b/src/scene.h
@@ -46,7 +46,7 @@ PlayerStatus::BonusType string_to_bonus(const std::string& str);
 
 extern PlayerStatus player_status;
 
-extern float scroll_x;
+extern float scroll_x, scroll_y;
 extern unsigned int global_frame_counter;
 
 #endif /*SUPERTUX_SCENE_H*/
diff --git a/src/sprite.cpp b/src/sprite.cpp
index bb31251a8..5c9c3f652 100644
--- a/src/sprite.cpp
+++ b/src/sprite.cpp
@@ -79,7 +79,7 @@ Sprite::draw(float x, float y)
   unsigned int frame = get_current_frame();
 
   if (frame < surfaces.size())
-    surfaces[frame]->draw(x - x_hotspot, y - y_hotspot);
+    surfaces[frame]->draw(x - x_hotspot, y - y_hotspot - scroll_y);
 }
 
 void
diff --git a/src/world.cpp b/src/world.cpp
index b1ad31f03..094f1be73 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -202,7 +202,7 @@ World::draw()
       for (x = 0; x < 21; ++x)
         {
           Tile::draw(32*x - fmodf(scroll_x, 32), y * 32,
-                     level->bg_tiles[(int)y][(int)x + (int)(scroll_x / 32)]);
+                     level->bg_tiles[(int)y + (int)(scroll_y / 32)][(int)x + (int)(scroll_x / 32)]);
         }
     }
 
@@ -212,7 +212,7 @@ World::draw()
       for (x = 0; x < 21; ++x)
         {
           Tile::draw(32*x - fmodf(scroll_x, 32), y * 32,
-                     level->ia_tiles[(int)y][(int)x + (int)(scroll_x / 32)]);
+                     level->ia_tiles[(int)y + (int)(scroll_y / 32)][(int)x + (int)(scroll_x / 32)]);
         }
     }
 
@@ -246,7 +246,7 @@ World::draw()
       for (x = 0; x < 21; ++x)
         {
           Tile::draw(32*x - fmodf(scroll_x, 32), y * 32,
-                     level->fg_tiles[(int)y][(int)x + (int)(scroll_x / 32)]);
+                     level->fg_tiles[(int)y + (int)(scroll_y / 32)][(int)x + (int)(scroll_x / 32)]);
         }
     }
 
@@ -390,6 +390,18 @@ void World::scrolling(double frame_ratio)
     scroll_x = 0;
   if(scroll_x > level->width * 32 - screen->w)
     scroll_x = level->width * 32 - screen->w;
+
+  /* Y-axis scrolling */
+
+  int tux_pos_y = (int)(tux.base.y + (tux.base.height/2));
+
+  scroll_y = tux_pos_y - (screen->h / 2);
+
+  // this code prevent the screen to scroll before the start or after the level's end
+  if(scroll_y < 0)
+    scroll_y = 0;
+  if(scroll_y > level->height * 32 - screen->h)
+    scroll_y = level->height * 32 - screen->h;
 }
 
 void
-- 
2.11.0