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* Copyright (c) 2013, Daniel Murphy
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package org.jbox2d.testbed.tests;
import org.jbox2d.collision.Manifold;
import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.EdgeShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Settings;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.dynamics.Fixture;
import org.jbox2d.dynamics.contacts.Contact;
import org.jbox2d.testbed.framework.TestbedTest;
public class OneSidedTest extends TestbedTest {
private static final long PLATFORM_TAG = 10;
private static final long CHARACTER_TAG = 11;
enum State {
e_unknown, e_above, e_below,
};
float m_radius, m_top, m_bottom;
State m_state;
Fixture m_platform;
Fixture m_character;
@Override
public Long getTag(Fixture fixture) {
if (fixture == m_platform)
return PLATFORM_TAG;
if (fixture == m_character)
return CHARACTER_TAG;
return super.getTag(fixture);
}
@Override
public void processFixture(Fixture fixture, Long tag) {
if (tag == PLATFORM_TAG) {
m_platform = fixture;
} else if (tag == CHARACTER_TAG) {
m_character = fixture;
} else {
super.processFixture(fixture, tag);
}
}
@Override
public boolean isSaveLoadEnabled() {
return true;
}
@Override
public String getTestName() {
return "One Sided";
}
@Override
public void initTest(boolean deserialized) {
m_state = State.e_unknown;
if (deserialized) {
return;
}
// Ground
{
BodyDef bd = new BodyDef();
Body ground = getWorld().createBody(bd);
EdgeShape shape = new EdgeShape();
shape.set(new Vec2(-20.0f, 0.0f), new Vec2(20.0f, 0.0f));
ground.createFixture(shape, 0.0f);
}
// Platform
{
BodyDef bd = new BodyDef();
bd.position.set(0.0f, 10.0f);
Body body = getWorld().createBody(bd);
PolygonShape shape = new PolygonShape();
shape.setAsBox(3.0f, 0.5f);
m_platform = body.createFixture(shape, 0.0f);
m_bottom = 10.0f - 0.5f;
m_top = 10.0f + 0.5f;
}
// Actor
{
BodyDef bd = new BodyDef();
bd.type = BodyType.DYNAMIC;
bd.position.set(0.0f, 12.0f);
Body body = getWorld().createBody(bd);
m_radius = 0.5f;
CircleShape shape = new CircleShape();
shape.m_radius = m_radius;
m_character = body.createFixture(shape, 20.0f);
body.setLinearVelocity(new Vec2(0.0f, -50.0f));
m_state = State.e_unknown;
}
}
@Override
public void preSolve(Contact contact, Manifold oldManifold) {
super.preSolve(contact, oldManifold);
Fixture fixtureA = contact.getFixtureA();
Fixture fixtureB = contact.getFixtureB();
if (fixtureA != m_platform && fixtureA != m_character) {
return;
}
if (fixtureB != m_character && fixtureB != m_character) {
return;
}
Vec2 position = m_character.getBody().getPosition();
if (position.y < m_top + m_radius - 3.0f * Settings.linearSlop) {
contact.setEnabled(false);
}
}
}