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.

---
 vec3d.cpp | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 vec3d.cpp

(limited to 'vec3d.cpp')

diff --git a/vec3d.cpp b/vec3d.cpp
new file mode 100644
index 0000000..5e073d8
--- /dev/null
+++ b/vec3d.cpp
@@ -0,0 +1,166 @@
+//
+//  glgrav - OpenGL N-Body gravity simulator
+//
+//  Copyright (C) 2003  Ian Cowburn (ianc@noddybox.demon.co.uk)
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  -------------------------------------------------------------------------
+//
+//  3D Vector
+//
+//
+static const char id[]="$Id: sparks.cpp 8 2010-08-18 14:38:34Z ianc $";
+
+#include "vec3d.h"
+
+#include <math.h>
+
+Vec3D::Vec3D()
+{
+    m_dx = 0.0;
+    m_dy = 0.0;
+    m_dz = 0.0;
+}
+
+Vec3D::Vec3D(double dx, double dy, double dz)
+{
+    m_dx = dx;
+    m_dy = dy;
+    m_dz = dz;
+}
+
+Vec3D::~Vec3D()
+{
+}
+
+void Vec3D::Set(double dx, double dy ,double dz)
+{
+    m_dx = dx;
+    m_dy = dy;
+    m_dz = dz;
+}
+
+double Vec3D::dx() const
+{
+    return m_dx;
+}
+
+double Vec3D::dy() const
+{
+    return m_dy;
+}
+
+double Vec3D::dz() const
+{
+    return m_dz;
+}
+
+
+bool Vec3D::IsNull() const
+{
+    return m_dx == 0.0 && m_dy == 0.0 && m_dz == 0.0;
+}
+
+
+double Vec3D::Length() const
+{
+    if (IsNull())
+    {
+    	return 0.0;
+    }
+    else
+    {
+	return sqrt(m_dx * m_dx + m_dy * m_dy + m_dz * m_dz);
+    }
+}
+
+
+void Vec3D::Normalise()
+{
+    double l;
+
+    l = Length();
+
+    m_dx /= l;
+    m_dy /= l;
+    m_dz /= l;
+}
+
+void Vec3D::SetLength(double d)
+{
+    Normalise();
+    Scale(d);
+}
+
+
+void Vec3D::AddScalar(double d)
+{
+    m_dx += d;
+    m_dy += d;
+    m_dz += d;
+}
+
+void Vec3D::Minus()
+{
+    m_dx = -m_dx;
+    m_dy = -m_dy;
+    m_dz = -m_dz;
+}
+
+void Vec3D::Scale(double d)
+{
+    m_dx *= d;
+    m_dy *= d;
+    m_dz *= d;
+}
+
+
+void Vec3D::Add(const Vec3D& v)
+{
+    m_dx += v.m_dx;
+    m_dy += v.m_dy;
+    m_dz += v.m_dz;
+}
+
+void Vec3D::Subtract(const Vec3D& v)
+{
+    m_dx -= v.m_dx;
+    m_dy -= v.m_dy;
+    m_dz -= v.m_dz;
+}
+
+void Vec3D::Scale(const Vec3D& v)
+{
+    m_dx *= v.m_dx;
+    m_dy *= v.m_dy;
+    m_dz *= v.m_dz;
+}
+
+double Vec3D::DotProduct(const Vec3D& v)
+{
+    return m_dx*v.m_dx + m_dy*v.m_dy + m_dz*v.m_dz;
+}
+
+Vec3D Vec3D::CrossProduct(const Vec3D& v)
+{
+    return Vec3D(m_dy * v.m_dz - v.m_dy * m_dz,
+    		 m_dz * v.m_dx - v.m_dz * m_dx,
+		 m_dx * v.m_dy - v.m_dx * m_dy);
+}
+
+
+
+// END OF FILE //
-- 
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