From 0c4c5fbe80545e39bd406f6bfb57659d39c4dca9 Mon Sep 17 00:00:00 2001
From: Alayan-stk-2 <Alayan-stk-2@users.noreply.github.com>
Date: Fri, 13 Apr 2018 08:50:10 +0200
Subject: [PATCH] Slipstreaming characteristics completely reworked

---
 data/kart_characteristics.xml | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/data/kart_characteristics.xml b/data/kart_characteristics.xml
index c7fd9ad7c..0fd237044 100644
--- a/data/kart_characteristics.xml
+++ b/data/kart_characteristics.xml
@@ -312,21 +312,27 @@
                max-speed-increase="5" duration="1" fade-out-time="2" max="20" />
 
         <!-- Slipstream
+            base-speed: the speed for which length and width are valid.
+                        They are upscaled when faster and downscaled when slower.
             length: How far behind a kart slipstream works
+                    (note : this helps OTHER karts)
             width: how wide slipstream works furthest away from the kart.
+            inner-factor: The proportion of the slipstreaming area with
+                          twice faster slipstream "credits" collection.
             collect-time: How many seconds of sstream give  maximum benefit
-            use-time: How long the benefit will last.
-            add-power: Additional power due to sstreaming. 1 = +100%
+            use-time: How long the benefit will last (obsolete, unused).
+            add-power: Additional power due to sstreaming.
             min-speed: Minimum speed necessary for slipstream to take effect.
             max-speed-increase: How much the speed of the kart might exceed
                 its normal maximum speed.
             duration: How long the higher speed lasts after slipstream stopped
-                working.
+                working (it works for at least collect-time more if the kart
+                don't go behind another kart to get further sstreaming time)
             fade-out-time: How long the slip stream speed increase will
                 gradually be reduced.  -->
-        <slipstream length="10" width="2" collect-time="2" use-time="5"
-                    add-power="3" min-speed="10" max-speed-increase="5"
-                    duration="1" fade-out-time="2" />
+        <slipstream base-speed="20" length="8" width="4" inner-factor="0.5"
+                    collect-time="2" use-time="5" add-power="200" min-speed="8"
+                    max-speed-increase="5" duration="1" fade-out-time="2" />
     </characteristic>
 
     <!-- The different difficulties (like easy, medium, hard) -->
@@ -360,9 +366,8 @@
                        invulnerability-time="7" />
             <nitro engine-force="350" max-speed-increase="4.5" duration="1.5"
                    fade-out-time="2.5" />
-            <slipstream length="11" collect-time="1.5" use-time="2.5" add-power="3.2"
-                        min-speed="9" max-speed-increase="4" duration="1.2"
-                        fade-out-time="2.3" />
+            <slipstream length="*0.9" collect-time="*0.9" add-power="*1.1"
+                        duration="*1.2" fade-out-time="*1.1" />
         </characteristic>
         <characteristic name="medium">
             <engine power="*0.63" max-speed="*1" brake-factor="*0.73"
@@ -374,8 +379,7 @@
             <explosion time="1.8" radius="5"
                        invulnerability-time="6" />
             <nitro engine-force="425" consumption="1.4" duration="1" />
-            <slipstream use-time="3.3" add-power="2.8" duration="0.9"
-                        fade-out-time="1.6" />
+            <slipstream add-power="*0.9" duration="*0.9" fade-out-time="*0.9" />
         </characteristic>
         <characteristic name="heavy">
             <engine power="*1" max-speed="*1" brake-factor="*0.66"
@@ -390,8 +394,8 @@
                        invulnerability-time="6" />
             <nitro engine-force="600" consumption="2" max-speed-increase="8"
                    duration="0.7" fade-out-time="1.3" />
-            <slipstream length="8.5" use-time="4" add-power="2.7" min-speed="10.5"
-                   max-speed-increase="8" duration="0.7" fade-out-time="1" />
+            <slipstream length="*1.1" collect-time="*1.1" add-power="*0.8"
+                   duration="*0.7" fade-out-time="*0.7" />
         </characteristic>
     </kart-types>