This patch was send to the mailing list by Ryan (aka sik0fewl).

�
I've made it so that sliding on ice works again (after the changes to the
input handling functions--looks much nicer now, btw).

I also changed supertux.stgt to make snow5.png ice. You can try out sliding
around on ice in the second level. I wasn't really sure what would be a good
sliding rate so people should try fiddling with different values.

Right now the accel/decel rate is the direct inverse of the velocity.. this
inverse can be increased or decreased.

Also, the smalltux animation doesn't "slide", he walks to a stop.. haven't
really looked into where to fix this, but I'm sure others could find it and
fix it before I could.
�

SVN-Revision: 532

diff --git a/data/images/tilesets/supertux.stgt b/data/images/tilesets/supertux.stgt
index 19304ad..ad64872 100644 (file)
--- a/data/images/tilesets/supertux.stgt
+++ b/data/images/tilesets/supertux.stgt
@@ -30,7 +30,8 @@
        (solid #t))
  (tile (id 11)
        (images "snow5.png")
-       (solid #t))
+       (solid #t)
+       (ice #t))
  (tile (id 12)
        (images "snow6.png")
        (solid #t))

diff --git a/src/player.cpp b/src/player.cpp
index ddb8104..0cf2438 100644 (file)
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -379,7 +379,20 @@ Player::handle_horizontal_input()
           ax = WALK_ACCELERATION_X * -1.5;
       }
   }
- 
+
+  // if we're on ice slow down acceleration or deceleration
+  if (isice(base.x, base.y + base.height))
+  {
+    /* the acceleration/deceleration rate on ice is inversely proportional to
+     * the current velocity.
+     */
+
+    // increasing 1 will increase acceleration/deceleration rate
+    // decreasing 1 will decrease acceleration/deceleration rate
+    //  must stay above zero, though
+    if (ax != 0) ax *= 1 / fabs(vx);
+  }
+
   physic.set_velocity(vx, vy);
   physic.set_acceleration(ax, ay);
 }