org.jbox2d.testbed.tests.PolyShapes Maven / Gradle / Ivy
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* Copyright (c) 2013, Daniel Murphy
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/**
* Created at 1:41:40 PM Jan 23, 2011
*/
package org.jbox2d.testbed.tests;
import org.jbox2d.callbacks.DebugDraw;
import org.jbox2d.callbacks.QueryCallback;
import org.jbox2d.collision.AABB;
import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.EdgeShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.collision.shapes.Shape;
import org.jbox2d.common.Color3f;
import org.jbox2d.common.MathUtils;
import org.jbox2d.common.Settings;
import org.jbox2d.common.Transform;
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.FixtureDef;
import org.jbox2d.pooling.IWorldPool;
import org.jbox2d.testbed.framework.TestbedSettings;
import org.jbox2d.testbed.framework.TestbedTest;
/**
* @author Daniel Murphy
*/
public class PolyShapes extends TestbedTest {
int k_maxBodies = 256;
int m_bodyIndex;
Body m_bodies[] = new Body[k_maxBodies];
PolygonShape m_polygons[] = new PolygonShape[4];
CircleShape m_circle;
@Override
public void initTest(boolean argDeserialized) {
// Ground body
{
BodyDef bd = new BodyDef();
Body ground = getWorld().createBody(bd);
EdgeShape shape = new EdgeShape();
shape.set(new Vec2(-40.0f, 0.0f), new Vec2(40.0f, 0.0f));
ground.createFixture(shape, 0.0f);
}
{
Vec2 vertices[] = new Vec2[3];
vertices[0] = new Vec2(-0.5f, 0.0f);
vertices[1] = new Vec2(0.5f, 0.0f);
vertices[2] = new Vec2(0.0f, 1.5f);
m_polygons[0] = new PolygonShape();
m_polygons[0].set(vertices, 3);
}
{
Vec2 vertices[] = new Vec2[3];
vertices[0] = new Vec2(-0.1f, 0.0f);
vertices[1] = new Vec2(0.1f, 0.0f);
vertices[2] = new Vec2(0.0f, 1.5f);
m_polygons[1] = new PolygonShape();
m_polygons[1].set(vertices, 3);
}
{
float w = 1.0f;
float b = w / (2.0f + MathUtils.sqrt(2.0f));
float s = MathUtils.sqrt(2.0f) * b;
Vec2 vertices[] = new Vec2[8];
vertices[0] = new Vec2(0.5f * s, 0.0f);
vertices[1] = new Vec2(0.5f * w, b);
vertices[2] = new Vec2(0.5f * w, b + s);
vertices[3] = new Vec2(0.5f * s, w);
vertices[4] = new Vec2(-0.5f * s, w);
vertices[5] = new Vec2(-0.5f * w, b + s);
vertices[6] = new Vec2(-0.5f * w, b);
vertices[7] = new Vec2(-0.5f * s, 0.0f);
m_polygons[2] = new PolygonShape();
m_polygons[2].set(vertices, 8);
}
{
m_polygons[3] = new PolygonShape();
m_polygons[3].setAsBox(0.5f, 0.5f);
}
{
m_circle = new CircleShape();
m_circle.m_radius = 0.5f;
}
m_bodyIndex = 0;
}
void Create(int index) {
BodyDef bd = new BodyDef();
bd.type = BodyType.DYNAMIC;
float x = MathUtils.randomFloat(-2.0f, 2.0f);
bd.position.set(x, 10.0f);
bd.angle = MathUtils.randomFloat(-MathUtils.PI, MathUtils.PI);
if (index == 4) {
bd.angularDamping = 0.02f;
}
m_bodies[m_bodyIndex] = getWorld().createBody(bd);
if (index < 4) {
FixtureDef fd = new FixtureDef();
fd.shape = m_polygons[index];
fd.density = 1.0f;
fd.friction = 0.3f;
m_bodies[m_bodyIndex].createFixture(fd);
} else {
FixtureDef fd = new FixtureDef();
fd.shape = m_circle;
fd.density = 1.0f;
fd.friction = 0.3f;
m_bodies[m_bodyIndex].createFixture(fd);
}
m_bodyIndex = (m_bodyIndex + 1) % k_maxBodies;
}
void DestroyBody() {
for (int i = 0; i < k_maxBodies; ++i) {
if (m_bodies[i] != null) {
getWorld().destroyBody(m_bodies[i]);
m_bodies[i] = null;
return;
}
}
}
@Override
public void keyPressed(char key, int argKeyCode) {
switch (key) {
case '1':
case '2':
case '3':
case '4':
case '5':
Create(key - '1');
break;
case 'a':
for (int i = 0; i < k_maxBodies; i += 2) {
if (m_bodies[i] != null) {
boolean active = m_bodies[i].isActive();
m_bodies[i].setActive(!active);
}
}
break;
case 'd':
DestroyBody();
break;
}
}
/**
* @see org.jbox2d.testbed.framework.TestbedTest#step(org.jbox2d.testbed.framework.TestbedSettings)
*/
@Override
public void step(TestbedSettings settings) {
super.step(settings);
PolyShapesCallback callback = new PolyShapesCallback(getWorld().getPool());
callback.m_circle.m_radius = 2.0f;
callback.m_circle.m_p.set(0.0f, 2.1f);
callback.m_transform.setIdentity();
callback.debugDraw = getDebugDraw();
AABB aabb = new AABB();
callback.m_circle.computeAABB(aabb, callback.m_transform, 0);
getWorld().queryAABB(callback, aabb);
Color3f color = new Color3f(0.4f, 0.7f, 0.8f);
getDebugDraw().drawCircle(callback.m_circle.m_p, callback.m_circle.m_radius, color);
addTextLine("Press 1-5 to drop stuff");
addTextLine("Press 'a' to (de)activate some bodies");
addTextLine("Press 'd' to destroy a body");
addTextLine("Up to 30 bodies in the target circle are highlighted");
}
/**
* @see org.jbox2d.testbed.framework.TestbedTest#getTestName()
*/
@Override
public String getTestName() {
return "PolyShapes";
}
}
/**
* This callback is called by b2World::QueryAABB. We find all the fixtures that overlap an AABB. Of
* those, we use b2TestOverlap to determine which fixtures overlap a circle. Up to 30 overlapped
* fixtures will be highlighted with a yellow border.
*
* @author Daniel Murphy
*/
class PolyShapesCallback implements QueryCallback {
int e_maxCount = 30;
CircleShape m_circle = new CircleShape();
Transform m_transform = new Transform();
DebugDraw debugDraw;
int m_count;
IWorldPool p;
public PolyShapesCallback(IWorldPool argWorld) {
m_count = 0;
p = argWorld;
}
void DrawFixture(Fixture fixture) {
Color3f color = new Color3f(0.95f, 0.95f, 0.6f);
final Transform xf = fixture.getBody().getTransform();
switch (fixture.getType()) {
case CIRCLE: {
CircleShape circle = (CircleShape) fixture.getShape();
Vec2 center = Transform.mul(xf, circle.m_p);
float radius = circle.m_radius;
debugDraw.drawCircle(center, radius, color);
}
break;
case POLYGON: {
PolygonShape poly = (PolygonShape) fixture.getShape();
int vertexCount = poly.m_count;
assert (vertexCount <= Settings.maxPolygonVertices);
Vec2 vertices[] = new Vec2[Settings.maxPolygonVertices];
for (int i = 0; i < vertexCount; ++i) {
vertices[i] = Transform.mul(xf, poly.m_vertices[i]);
}
debugDraw.drawPolygon(vertices, vertexCount, color);
}
break;
default:
break;
}
}
public boolean reportFixture(Fixture fixture) {
if (m_count == e_maxCount) {
return false;
}
Body body = fixture.getBody();
Shape shape = fixture.getShape();
boolean overlap = p.getCollision().testOverlap(shape, 0, m_circle, 0, body.getTransform(),
m_transform);
if (overlap) {
DrawFixture(fixture);
++m_count;
}
return true;
}
}
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