Added Box2D

external/Box2D-2.3.1/Box2D/Testbed/Tests/ConvexHull.h

@@ -0,0 +1,109 @@
+/*
+* Copyright (c) 2011 Erin Catto http://www.box2d.org
+*
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 1. The origin of this software must not be misrepresented; you must not
+* claim that you wrote the original software. If you use this software
+* in a product, an acknowledgment in the product documentation would be
+* appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef CONVEX_HULL_H
+#define CONVEX_HULL_H
+
+class ConvexHull : public Test
+{
+public:
+	enum
+	{
+		e_count = b2_maxPolygonVertices
+	};
+
+	ConvexHull()
+	{
+		Generate();
+		m_auto = false;
+	}
+
+	void Generate()
+	{
+		b2Vec2 lowerBound(-8.0f, -8.0f);
+		b2Vec2 upperBound(8.0f, 8.0f);
+
+		for (int32 i = 0; i < e_count; ++i)
+		{
+			float32 x = 10.0f * RandomFloat();
+			float32 y = 10.0f * RandomFloat();
+
+			// Clamp onto a square to help create collinearities.
+			// This will stress the convex hull algorithm.
+			b2Vec2 v(x, y);
+			v = b2Clamp(v, lowerBound, upperBound);
+			m_points[i] = v;
+		}
+
+		m_count = e_count;
+	}
+
+	static Test* Create()
+	{
+		return new ConvexHull;
+	}
+
+	void Keyboard(int key)
+	{
+		switch (key)
+		{
+		case GLFW_KEY_A:
+			m_auto = !m_auto;
+			break;
+
+		case GLFW_KEY_G:
+			Generate();
+			break;
+		}
+	}
+
+	void Step(Settings* settings)
+	{
+		Test::Step(settings);
+
+		b2PolygonShape shape;
+		shape.Set(m_points, m_count);
+
+		g_debugDraw.DrawString(5, m_textLine, "Press g to generate a new random convex hull");
+		m_textLine += DRAW_STRING_NEW_LINE;
+
+		g_debugDraw.DrawPolygon(shape.m_vertices, shape.m_count, b2Color(0.9f, 0.9f, 0.9f));
+
+		for (int32 i = 0; i < m_count; ++i)
+		{
+			g_debugDraw.DrawPoint(m_points[i], 3.0f, b2Color(0.3f, 0.9f, 0.3f));
+			g_debugDraw.DrawString(m_points[i] + b2Vec2(0.05f, 0.05f), "%d", i);
+		}
+
+		if (shape.Validate() == false)
+		{
+			m_textLine += 0;
+		}
+
+		if (m_auto)
+		{
+			Generate();
+		}
+	}
+
+	b2Vec2 m_points[b2_maxPolygonVertices];
+	int32 m_count;
+	bool m_auto;
+};
+
+#endif