embedded_libs/box2d-2.4.1/testbed/tests/pinball.cpp

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// 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);