embedded_libs/box2d-2.4.1/testbed/tests/web.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"
// Test distance joints, body destruction, and joint destruction.
class Web : public Test
{
public:
Web()
{
b2Body* ground = NULL;
{
b2BodyDef bd;
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(0.5f, 0.5f);
b2BodyDef bd;
bd.type = b2_dynamicBody;
bd.position.Set(-5.0f, 5.0f);
m_bodies[0] = m_world->CreateBody(&bd);
m_bodies[0]->CreateFixture(&shape, 5.0f);
bd.position.Set(5.0f, 5.0f);
m_bodies[1] = m_world->CreateBody(&bd);
m_bodies[1]->CreateFixture(&shape, 5.0f);
bd.position.Set(5.0f, 15.0f);
m_bodies[2] = m_world->CreateBody(&bd);
m_bodies[2]->CreateFixture(&shape, 5.0f);
bd.position.Set(-5.0f, 15.0f);
m_bodies[3] = m_world->CreateBody(&bd);
m_bodies[3]->CreateFixture(&shape, 5.0f);
b2DistanceJointDef jd;
b2Vec2 p1, p2, d;
float frequencyHz = 2.0f;
float dampingRatio = 0.0f;
jd.bodyA = ground;
jd.bodyB = m_bodies[0];
jd.localAnchorA.Set(-10.0f, 0.0f);
jd.localAnchorB.Set(-0.5f, -0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[0] = m_world->CreateJoint(&jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[1];
jd.localAnchorA.Set(10.0f, 0.0f);
jd.localAnchorB.Set(0.5f, -0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[1] = m_world->CreateJoint(&jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[2];
jd.localAnchorA.Set(10.0f, 20.0f);
jd.localAnchorB.Set(0.5f, 0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[2] = m_world->CreateJoint(&jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[3];
jd.localAnchorA.Set(-10.0f, 20.0f);
jd.localAnchorB.Set(-0.5f, 0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[3] = m_world->CreateJoint(&jd);
jd.bodyA = m_bodies[0];
jd.bodyB = m_bodies[1];
jd.localAnchorA.Set(0.5f, 0.0f);
jd.localAnchorB.Set(-0.5f, 0.0f);;
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[4] = m_world->CreateJoint(&jd);
jd.bodyA = m_bodies[1];
jd.bodyB = m_bodies[2];
jd.localAnchorA.Set(0.0f, 0.5f);
jd.localAnchorB.Set(0.0f, -0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[5] = m_world->CreateJoint(&jd);
jd.bodyA = m_bodies[2];
jd.bodyB = m_bodies[3];
jd.localAnchorA.Set(-0.5f, 0.0f);
jd.localAnchorB.Set(0.5f, 0.0f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[6] = m_world->CreateJoint(&jd);
jd.bodyA = m_bodies[3];
jd.bodyB = m_bodies[0];
jd.localAnchorA.Set(0.0f, -0.5f);
jd.localAnchorB.Set(0.0f, 0.5f);
p1 = jd.bodyA->GetWorldPoint(jd.localAnchorA);
p2 = jd.bodyB->GetWorldPoint(jd.localAnchorB);
d = p2 - p1;
jd.length = d.Length();
b2LinearStiffness(jd.stiffness, jd.damping, frequencyHz, dampingRatio, jd.bodyA, jd.bodyB);
m_joints[7] = m_world->CreateJoint(&jd);
}
}
void Keyboard(int key) override
{
switch (key)
{
case GLFW_KEY_B:
for (int32 i = 0; i < 4; ++i)
{
if (m_bodies[i])
{
m_world->DestroyBody(m_bodies[i]);
m_bodies[i] = NULL;
break;
}
}
break;
case GLFW_KEY_J:
for (int32 i = 0; i < 8; ++i)
{
if (m_joints[i])
{
m_world->DestroyJoint(m_joints[i]);
m_joints[i] = NULL;
break;
}
}
break;
}
}
void Step(Settings& settings) override
{
Test::Step(settings);
g_debugDraw.DrawString(5, m_textLine, "Press: (b) to delete a body, (j) to delete a joint");
m_textLine += m_textIncrement;
}
void JointDestroyed(b2Joint* joint) override
{
for (int32 i = 0; i < 8; ++i)
{
if (m_joints[i] == joint)
{
m_joints[i] = NULL;
break;
}
}
}
static Test* Create()
{
return new Web;
}
b2Body* m_bodies[4];
b2Joint* m_joints[8];
};
static int testIndex = RegisterTest("Examples", "Web", Web::Create);