From bea93daec3ad4e3345c701e5dcce250c44d128f2 Mon Sep 17 00:00:00 2001
From: Philipp Sehmisch <tmw@crushnet.org>
Date: Tue, 24 Jun 2008 12:29:33 +0000
Subject: Added particle property "follow-parent" which makes the particle move
 when its parent particle is moved.

---
 src/particle.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/particle.cpp')

diff --git a/src/particle.cpp b/src/particle.cpp
index fd45430c..3b3f5116 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -63,6 +63,7 @@ Particle::Particle(Map *map):
     mGravity(0.0f),
     mRandomnes(0),
     mBounce(0.0f),
+    mFollow(false),
     mTarget(NULL),
     mAcceleration(0.0f),
     mInvDieDistance(-1.0f),
@@ -95,6 +96,8 @@ Particle::update()
         mAlive = false;
     }
 
+    Vector oldPos = mPos;
+
     if (mAlive)
     {
         //calculate particle movement
@@ -191,10 +194,19 @@ Particle::update()
         }
     }
 
+    Vector change = mPos - oldPos;
+
     // Update child particles
+
     for (ParticleIterator p = mChildParticles.begin();
          p != mChildParticles.end();)
     {
+        //move particle with its parent if desired
+        if ((*p)->doesFollow())
+        {
+            (*p)->moveBy(change);
+        }
+        //update particle
         if ((*p)->update())
         {
             p++;
-- 
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