Add initial prototype.

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

@@ -0,0 +1,170 @@
+// 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"
+
+/// This tests bullet collision and provides an example of a gameplay scenario.
+/// This also uses a loop shape.
+class Pinball : public Test
+{
+public:
+	Pinball()
+	{
+		// Ground body
+		b2Body* ground = NULL;
+		{
+			b2BodyDef bd;
+			ground = m_world->CreateBody(&bd);
+
+			b2Vec2 vs[5];
+			vs[0].Set(-8.0f, 6.0f);
+			vs[1].Set(-8.0f, 20.0f);
+			vs[2].Set(8.0f, 20.0f);
+			vs[3].Set(8.0f, 6.0f);
+			vs[4].Set(0.0f, -2.0f);
+
+			b2ChainShape loop;
+			loop.CreateLoop(vs, 5);
+			b2FixtureDef fd;
+			fd.shape = &loop;
+			fd.density = 0.0f;
+			ground->CreateFixture(&fd);
+		}
+
+		// Flippers
+		{
+			b2Vec2 p1(-2.0f, 0.0f), p2(2.0f, 0.0f);
+
+			b2BodyDef bd;
+			bd.type = b2_dynamicBody;
+
+			bd.position = p1;
+			b2Body* leftFlipper = m_world->CreateBody(&bd);
+
+			bd.position = p2;
+			b2Body* rightFlipper = m_world->CreateBody(&bd);
+
+			b2PolygonShape box;
+			box.SetAsBox(1.75f, 0.1f);
+
+			b2FixtureDef fd;
+			fd.shape = &box;
+			fd.density = 1.0f;
+
+			leftFlipper->CreateFixture(&fd);
+			rightFlipper->CreateFixture(&fd);
+
+			b2RevoluteJointDef jd;
+			jd.bodyA = ground;
+			jd.localAnchorB.SetZero();
+			jd.enableMotor = true;
+			jd.maxMotorTorque = 1000.0f;
+			jd.enableLimit = true;
+
+			jd.motorSpeed = 0.0f;
+			jd.localAnchorA = p1;
+			jd.bodyB = leftFlipper;
+			jd.lowerAngle = -30.0f * b2_pi / 180.0f;
+			jd.upperAngle = 5.0f * b2_pi / 180.0f;
+			m_leftJoint = (b2RevoluteJoint*)m_world->CreateJoint(&jd);
+
+			jd.motorSpeed = 0.0f;
+			jd.localAnchorA = p2;
+			jd.bodyB = rightFlipper;
+			jd.lowerAngle = -5.0f * b2_pi / 180.0f;
+			jd.upperAngle = 30.0f * b2_pi / 180.0f;
+			m_rightJoint = (b2RevoluteJoint*)m_world->CreateJoint(&jd);
+		}
+
+		// Circle character
+		{
+			b2BodyDef bd;
+			bd.position.Set(1.0f, 15.0f);
+			bd.type = b2_dynamicBody;
+			bd.bullet = true;
+
+			m_ball = m_world->CreateBody(&bd);
+
+			b2CircleShape shape;
+			shape.m_radius = 0.2f;
+
+			b2FixtureDef fd;
+			fd.shape = &shape;
+			fd.density = 1.0f;
+			m_ball->CreateFixture(&fd);
+		}
+
+		m_button = false;
+	}
+
+	void Step(Settings& settings) override
+	{
+		if (m_button)
+		{
+			m_leftJoint->SetMotorSpeed(20.0f);
+			m_rightJoint->SetMotorSpeed(-20.0f);
+		}
+		else
+		{
+			m_leftJoint->SetMotorSpeed(-10.0f);
+			m_rightJoint->SetMotorSpeed(10.0f);
+		}
+
+		Test::Step(settings);
+
+		g_debugDraw.DrawString(5, m_textLine, "Press 'a' to control the flippers");
+		m_textLine += m_textIncrement;
+
+	}
+
+	void Keyboard(int key) override
+	{
+		switch (key)
+		{
+		case GLFW_KEY_A:
+			m_button = true;
+			break;
+		}
+	}
+
+	void KeyboardUp(int key) override
+	{
+		switch (key)
+		{
+		case GLFW_KEY_A:
+			m_button = false;
+			break;
+		}
+	}
+
+	static Test* Create()
+	{
+		return new Pinball;
+	}
+
+	b2RevoluteJoint* m_leftJoint;
+	b2RevoluteJoint* m_rightJoint;
+	b2Body* m_ball;
+	bool m_button;
+};
+
+static int testIndex = RegisterTest("Examples", "Pinball", Pinball::Create);