Add initial prototype.

3-mid/physics/implement/box2d/contrib/testbed/tests/friction.cpp

@@ -0,0 +1,127 @@
+// MIT License
+
+// Copyright (c) 2019 Erin Catto
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "test.h"
+
+class Friction : public Test
+{
+public:
+
+	Friction()
+	{
+		{
+			b2BodyDef bd;
+			b2Body* ground = m_world->CreateBody(&bd);
+
+			b2EdgeShape shape;
+			shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(13.0f, 0.25f);
+
+			b2BodyDef bd;
+			bd.position.Set(-4.0f, 22.0f);
+			bd.angle = -0.25f;
+
+			b2Body* ground = m_world->CreateBody(&bd);
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(0.25f, 1.0f);
+
+			b2BodyDef bd;
+			bd.position.Set(10.5f, 19.0f);
+
+			b2Body* ground = m_world->CreateBody(&bd);
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(13.0f, 0.25f);
+
+			b2BodyDef bd;
+			bd.position.Set(4.0f, 14.0f);
+			bd.angle = 0.25f;
+
+			b2Body* ground = m_world->CreateBody(&bd);
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(0.25f, 1.0f);
+
+			b2BodyDef bd;
+			bd.position.Set(-10.5f, 11.0f);
+
+			b2Body* ground = m_world->CreateBody(&bd);
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(13.0f, 0.25f);
+
+			b2BodyDef bd;
+			bd.position.Set(-4.0f, 6.0f);
+			bd.angle = -0.25f;
+
+			b2Body* ground = m_world->CreateBody(&bd);
+			ground->CreateFixture(&shape, 0.0f);
+		}
+
+		{
+			b2PolygonShape shape;
+			shape.SetAsBox(0.5f, 0.5f);
+
+			b2FixtureDef fd;
+			fd.shape = &shape;
+			fd.density = 25.0f;
+
+			float friction[5] = {0.75f, 0.5f, 0.35f, 0.1f, 0.0f};
+
+			for (int i = 0; i < 5; ++i)
+			{
+				b2BodyDef bd;
+				bd.type = b2_dynamicBody;
+				bd.position.Set(-15.0f + 4.0f * i, 28.0f);
+				b2Body* body = m_world->CreateBody(&bd);
+
+				fd.friction = friction[i];
+				body->CreateFixture(&fd);
+			}
+		}
+	}
+
+	static Test* Create()
+	{
+		return new Friction;
+	}
+};
+
+static int testIndex = RegisterTest("Forces", "Friction", Friction::Create);