From af34bad8b39e95276b0d4e08ccdc26f89df2d2ec Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Thu, 19 Aug 2010 13:24:37 +0000
Subject: Updates to maths and added the use of a 3D vector.

---
 mass.cpp | 79 +++++++++++++++++++---------------------------------------------
 1 file changed, 23 insertions(+), 56 deletions(-)

(limited to 'mass.cpp')

diff --git a/mass.cpp b/mass.cpp
index 20f932c..95a76f9 100644
--- a/mass.cpp
+++ b/mass.cpp
@@ -41,10 +41,6 @@ Mass::Mass()
     m_y=0.0;
     m_z=0.0;
 
-    m_dx=0.0;
-    m_dy=0.0;
-    m_dz=0.0;
-
     m_r=1.0;
     m_g=1.0;
     m_b=1.0;
@@ -69,9 +65,10 @@ Mass::Mass()
 
 
 Mass::Mass(const string& name, double mass, double scale,
-	double posx, double posy, double posz,
-	double dx, double dy, double dz,
-	GLfloat r, GLfloat g, GLfloat b, double rot, int shield)
+	   double posx, double posy, double posz,
+	   double dx, double dy, double dz,
+	   GLfloat r, GLfloat g, GLfloat b, double rot, int shield)
+	   	: m_delta(dx, dy, dz)
 {
     m_name=name;
 
@@ -83,10 +80,6 @@ Mass::Mass(const string& name, double mass, double scale,
     m_y=posy;
     m_z=posz;
 
-    m_dx=dx;
-    m_dy=dy;
-    m_dz=dz;
-
     m_r=r;
     m_g=g;
     m_b=b;
@@ -128,8 +121,8 @@ Mass::~Mass()
 // ---------------------------------------- PUBLIC MEMBERS
 //
 void Mass::setRing(double from, double to, 
-	GLfloat r, GLfloat g, GLfloat b, GLfloat alpha,
-	double rot, double ang)
+		   GLfloat r, GLfloat g, GLfloat b, GLfloat alpha,
+		   double rot, double ang)
 {
     m_ring=true;
     m_ring_from=from;
@@ -217,9 +210,9 @@ void Mass::getPreviousPosition(double& x, double& y, double& z) const
 
 void Mass::getDelta(double& dx, double& dy, double& dz) const
 {
-    dx=m_dx;
-    dy=m_dy;
-    dz=m_dz;
+    dx = m_delta.dx();
+    dy = m_delta.dy();
+    dz = m_delta.dz();
 }
 
 
@@ -235,9 +228,8 @@ void Mass::reset(double mass, double dx, double dy, double dz)
 {
     m_mass=mass;
     calcSize();
-    m_dx=dx;
-    m_dy=dy;
-    m_dz=dz;
+
+    m_delta.Set(dx, dy, dz);
 
     if (m_mass<=0.0)
     {
@@ -296,39 +288,13 @@ bool Mass::calcAttraction(Mass& m, double gr_const)
 	collide=false;
     }
 
-    // ga=((gr_const*m.m_mass)*(gr_const*m_mass))/(dist*gr_const);
+    ga = gr_const * (m.m_mass / (dist * dist));
 
-    ga=gr_const * (m_mass / dist);
-
-    if (m_x<m.m_x)
-    {
-	m_dx+=ga/(m_mass/dx);
-    }
+    Vec3D force(dx, dy, dz);
 
-    if (m_x>m.m_x)
-    {
-	m_dx-=ga/(m_mass/dx);
-    }
+    force.SetLength(ga);
 
-    if (m_y<m.m_y)
-    {
-	m_dy+=ga/(m_mass/dy);
-    }
-
-    if (m_y>m.m_y)
-    {
-	m_dy-=ga/(m_mass/dy);
-    }
-
-    if (m_z<m.m_z)
-    {
-	m_dz+=ga/(m_mass/dz);
-    }
-
-    if (m_z>m.m_z)
-    {
-	m_dz-=ga/(m_mass/dz);
-    }
+    m_delta.Add(force);
 
     return collide && !m_massless;
 }
@@ -340,9 +306,9 @@ void Mass::move()
     m_prevy=m_y;
     m_prevz=m_z;
 
-    m_x+=m_dx;
-    m_y+=m_dy;
-    m_z+=m_dz;
+    m_x+=m_delta.dx();
+    m_y+=m_delta.dy();
+    m_z+=m_delta.dz();
 
     m_ang+=m_rot;
     m_ring_ang+=m_ring_rot;
@@ -462,9 +428,9 @@ void Mass::draw(bool solid, bool texture, Mass::DrawItem item) const
 //
 double Mass::calcDistance2(Mass& m, double& dx, double& dy, double& dz)
 {
-    dx=abs(m_x-m.m_x);
-    dy=abs(m_y-m.m_y);
-    dz=abs(m_z-m.m_z);
+    dx = m.m_x-m_x;
+    dy = m.m_y-m_y;
+    dz = m.m_z-m_z;
 
     return sqrt((dx*dx)+(dy*dy)+(dz*dz));
 }
@@ -489,7 +455,8 @@ ostream& operator<<(ostream& os, const Mass& m)
     os << "Name " << m.m_name << "  (mass " << m.m_mass
 	<< ", size " << m.m_size << ", shield " << m.m_shield << ")"  << endl
 	<< "    P (" << m.m_x << ", " << m.m_y << ", " << m.m_z << ")" << endl
-	<< "    D (" << m.m_dx << ", " << m.m_dy << ", " << m.m_dz << ")" << endl
+	<< "    D (" << m.m_delta.dx() << ", " << m.m_delta.dy()
+		     << ", " << m.m_delta.dz() << ")" << endl
 	<< "    R (" << m.m_rot << ", " << m.m_ang << ")" << endl
 	<< "    T (" << m.m_textured << ", " << m.m_texture_id << ")" << endl
 	<< " Ring (" << m.m_ring << ", " << m.m_ring_from 
-- 
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