From 0c64a3cf001f3ef5ecdb80462ae1891d582379ee Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Sun, 3 Dec 2006 13:10:04 +0100
Subject: [PATCH] rnd-20061203-1-src * improved "no scrolling when relocating"
 to also consider scroll delay   (meaning that the player is not automatically
 centered in this case;   this makes it possible to "invisibly" relocate the
 player to a region   of the level playfield which looks the same as the old
 level region)

---
 ChangeLog      |  6 ++++++
 src/conftime.h |  2 +-
 src/game.c     | 48 +++++++++++++++++++++++++++++++++++++-----------
 3 files changed, 44 insertions(+), 12 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index bf2df826..6d84463c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2006-12-03
+	* improved "no scrolling when relocating" to also consider scroll delay
+	  (meaning that the player is not automatically centered in this case;
+	  this makes it possible to "invisibly" relocate the player to a region
+	  of the level playfield which looks the same as the old level region)
+
 2006-12-02
 	* fixed bug with displaying masked borders over title screens when
 	  screen fading is disabled
diff --git a/src/conftime.h b/src/conftime.h
index c2aafc00..0a5d014f 100644
--- a/src/conftime.h
+++ b/src/conftime.h
@@ -1 +1 @@
-#define COMPILE_DATE_STRING "[2006-12-02 16:27]"
+#define COMPILE_DATE_STRING "[2006-12-03 12:49]"
diff --git a/src/game.c b/src/game.c
index a41363d1..3f3e6317 100644
--- a/src/game.c
+++ b/src/game.c
@@ -3328,8 +3328,8 @@ static void setScreenCenteredToAllPlayers(int *sx, int *sy)
   *sy = (sy1 + sy2) / 2;
 }
 
-void DrawRelocateScreen(int x, int y, int move_dir, boolean center_screen,
-			boolean quick_relocation)
+void DrawRelocateScreen(int old_x, int old_y, int x, int y, int move_dir,
+			boolean center_screen, boolean quick_relocation)
 {
   boolean ffwd_delay = (tape.playing && tape.fast_forward);
   boolean no_delay = (tape.warp_forward);
@@ -3342,13 +3342,39 @@ void DrawRelocateScreen(int x, int y, int move_dir, boolean center_screen,
 
     if (!IN_VIS_FIELD(SCREENX(x), SCREENY(y)) || center_screen)
     {
-      scroll_x = (x < SBX_Left  + MIDPOSX ? SBX_Left :
-		  x > SBX_Right + MIDPOSX ? SBX_Right :
-		  x - MIDPOSX);
+      if (center_screen)
+      {
+	scroll_x = (x < SBX_Left  + MIDPOSX ? SBX_Left :
+		    x > SBX_Right + MIDPOSX ? SBX_Right :
+		    x - MIDPOSX);
+
+	scroll_y = (y < SBY_Upper + MIDPOSY ? SBY_Upper :
+		    y > SBY_Lower + MIDPOSY ? SBY_Lower :
+		    y - MIDPOSY);
+      }
+      else
+      {
+	/* quick relocation (without scrolling), but do not center screen */
 
-      scroll_y = (y < SBY_Upper + MIDPOSY ? SBY_Upper :
-		  y > SBY_Lower + MIDPOSY ? SBY_Lower :
-		  y - MIDPOSY);
+	int center_scroll_x = (old_x < SBX_Left  + MIDPOSX ? SBX_Left :
+			       old_x > SBX_Right + MIDPOSX ? SBX_Right :
+			       old_x - MIDPOSX);
+
+	int center_scroll_y = (old_y < SBY_Upper + MIDPOSY ? SBY_Upper :
+			       old_y > SBY_Lower + MIDPOSY ? SBY_Lower :
+			       old_y - MIDPOSY);
+
+	int offset_x = x + (scroll_x - center_scroll_x);
+	int offset_y = y + (scroll_y - center_scroll_y);
+
+	scroll_x = (offset_x < SBX_Left  + MIDPOSX ? SBX_Left :
+		    offset_x > SBX_Right + MIDPOSX ? SBX_Right :
+		    offset_x - MIDPOSX);
+
+	scroll_y = (offset_y < SBY_Upper + MIDPOSY ? SBY_Upper :
+		    offset_y > SBY_Lower + MIDPOSY ? SBY_Lower :
+		    offset_y - MIDPOSY);
+      }
     }
     else
     {
@@ -3495,8 +3521,8 @@ void RelocatePlayer(int jx, int jy, int el_player_raw)
   }
 
   /* only visually relocate centered player */
-  DrawRelocateScreen(player->jx, player->jy, player->MovDir, FALSE,
-		     level.instant_relocation);
+  DrawRelocateScreen(old_jx, old_jy, player->jx, player->jy, player->MovDir,
+		     FALSE, level.instant_relocation);
 
   TestIfPlayerTouchesBadThing(jx, jy);
   TestIfPlayerTouchesCustomElement(jx, jy);
@@ -9341,7 +9367,7 @@ void GameActions_RND()
     game.centered_player_nr = game.centered_player_nr_next;
     game.set_centered_player = FALSE;
 
-    DrawRelocateScreen(sx, sy, MV_NONE, TRUE, setup.quick_switch);
+    DrawRelocateScreen(0, 0, sx, sy, MV_NONE, TRUE, setup.quick_switch);
     DrawGameDoorValues();
   }
 
-- 
2.34.1