From: Ingo Ruhnke <grumbel@gmx.de>
Date: Fri, 14 Mar 2008 23:48:23 +0000 (+0000)
Subject: Ed <icelus2k5@gmail.com>'s jump patch
X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=1d01d271889c13653bffd0c9824ee8a72b339b56;p=supertux.git

Ed <icelus2k5@gmail.com>'s jump patch
- minimum jump high is now ~2 tiles
- small jumps look smoother
- should change nothing for bigger jump, so for normal gameplay it should feel the same (unless there are unknown bugs)

SVN-Revision: 5375
---

diff --git a/src/object/player.cpp b/src/object/player.cpp
index df0a5aa43..e4bbced9a 100644
--- a/src/object/player.cpp
+++ b/src/object/player.cpp
@@ -86,6 +86,9 @@ static const float CHEER_TIME = 1.0f;
 
 /** if Tux cannot unduck for this long, he will get hurt */
 static const float UNDUCK_HURT_TIME = 0.25f;
+/** gravity is higher after the jump key is released before
+    the apex of the jump is reached */
+static const float JUMP_EARLY_APEX_FACTOR = 3.0;
 
 namespace{
   bool no_water = true;
@@ -140,6 +143,7 @@ Player::init()
   last_ground_y = 0;
   fall_mode = ON_GROUND;
   jumping = false;
+  jump_early_apex = false;
   can_jump = true;
   wants_buttjump = false;
   does_buttjump = false;
@@ -567,6 +571,24 @@ Player::do_jump(float yspeed) {
 }
 
 void
+Player::early_jump_apex() {
+  if(jump_early_apex) {
+    return;
+  }
+  jump_early_apex = true;
+  physic.set_gravity(physic.get_gravity() * JUMP_EARLY_APEX_FACTOR);
+};
+
+void
+Player::do_jump_apex() {
+  if(!jump_early_apex) {
+    return;
+  }
+  jump_early_apex = false;
+  physic.set_gravity(physic.get_gravity() / JUMP_EARLY_APEX_FACTOR);
+}
+
+void
 Player::handle_vertical_input()
 {
   // Press jump key
@@ -583,10 +605,14 @@ Player::handle_vertical_input()
   else if(!controller->hold(Controller::JUMP)) {
     if (!backflipping && jumping && physic.get_velocity_y() < 0) {
       jumping = false;
-      physic.set_velocity_y(0);
+      early_jump_apex();
     }
   }
 
+  if(jump_early_apex && physic.get_velocity_y() >= 0) {
+    do_jump_apex();
+  }
+
   /* In case the player has pressed Down while in a certain range of air,
      enable butt jump action */
   if (controller->hold(Controller::DOWN) && !duck && is_big() && !on_ground()) {
diff --git a/src/object/player.hpp b/src/object/player.hpp
index 4c715c79e..be124ac05 100644
--- a/src/object/player.hpp
+++ b/src/object/player.hpp
@@ -74,6 +74,7 @@ private:
   bool swimming;
   float speedlimit;
   Controller* scripting_controller_old; /**< Saves the old controller while the scripting_controller is used */
+  bool jump_early_apex;
 
 public:
   Direction dir;
@@ -273,6 +274,9 @@ private:
   void deactivate();
   void walk(float speed);
 
+  void do_jump_apex();
+  void early_jump_apex();
+
   /**
    * slows Tux down a little, based on where he's standing
    */