From 67f8a7a783e550cab8e6a77d997b31815ee8cd7e Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Sat, 2 Feb 2008 14:53:46 +0000
Subject: introduced librender

---
 src/render/sphere.cc | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/render/sphere.cc

(limited to 'src/render/sphere.cc')

diff --git a/src/render/sphere.cc b/src/render/sphere.cc
new file mode 100644
index 0000000..1715263
--- /dev/null
+++ b/src/render/sphere.cc
@@ -0,0 +1,95 @@
+/*
+   gl/sphere.cc
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#include "render/sphere.h"
+#include "math/mathlib.h"
+
+using math::Vector3f;
+using math::Color;
+
+namespace render {
+
+const int segments = 33;
+
+Sphere::Sphere(Vector3f p , float r)
+{
+	position = p;
+	radius = r;
+		
+	// TODO make global sine-cosine lists
+	sintable = new float[segments];
+	costable = new float[segments];
+	float d = 2 * M_PI / segments;
+
+	for (int i=0; i < segments; i++) {
+		sintable[i] = sin( d * (float) i );
+		costable[i] = cos ( d * (float) i );
+	}
+}
+
+Sphere::~Sphere()
+{
+	delete[] sintable;
+	delete[] costable;
+}
+
+Sphere::Sphere(const Sphere &other) 
+{
+	(*this) = other;
+}
+	
+Sphere& Sphere::operator=(const Sphere &other)
+{
+	position = other.position;
+	radius = other.radius;
+	return (*this);
+}
+
+void Sphere::draw()
+{
+	using namespace gl;
+
+	// draw top
+	// TODO upside-down
+	float r = radius*sintable[1];
+	float h = radius*costable[1];
+
+	begin(LineLoop);
+	//begin(Polygon);
+	for (int i = segments-1; i >= 0; i--)
+		vertex(r*costable[i], h, r*sintable[i]);
+	end();
+
+	// draw bottom
+	// TODO upside-down
+	begin(LineLoop);
+	for (int i = 0; i< segments; i++)
+		vertex(r*costable[i], -h, r*sintable[i]);
+	end();
+
+	// draw body
+	for (int j=1; j < segments-1; j++) {
+		r = radius*sintable[j];
+		float r1 = radius*sintable[j+1];
+		
+		begin(QuadStrip);
+		vertex(r1, radius*costable[j+1], 0);
+		vertex(r, radius*costable[j], 0);
+
+		for (int i = segments-1; i >= 0; i--) {			
+			vertex(r1*costable[i], radius*costable[j+1], r1*sintable[i]);
+			vertex(r*costable[i], radius*costable[j], r*sintable[i]);
+			//vertex(r*costable[i-1], radius*costable[j], r*sintable[i-1]);
+			//vertex(r1*costable[i-1], radius*costable[j+1], r1*sintable[i-1]);
+		}
+		end();
+		
+	}
+}
+	
+
+}
+
-- 
cgit v1.2.3