[LIBGDX学习]LibGDX代码详解（五）Box2D

import com.badlogic.gdx.Application;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputMultiplexer;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.input.GestureDetector;
import com.badlogic.gdx.input.GestureDetector.GestureListener;
import com.badlogic.gdx.math.Vector2;
import com.mygdx.game.box2d.ApplyForce;
import com.mygdx.game.box2d.BodyTypes;
import com.mygdx.game.box2d.Box2DTest;
import com.mygdx.game.box2d.Bridge;
import com.mygdx.game.box2d.Cantilever;
import com.mygdx.game.box2d.Chain;
import com.mygdx.game.box2d.CharacterCollision;
import com.mygdx.game.box2d.CollisionFiltering;
import com.mygdx.game.box2d.ContactListenerTest;
import com.mygdx.game.box2d.ContinuousTest;
import com.mygdx.game.box2d.ConveyorBelt;
import com.mygdx.game.box2d.DebugRendererTest;
import com.mygdx.game.box2d.OneSidedPlatform;
import com.mygdx.game.box2d.Prismatic;
import com.mygdx.game.box2d.Pyramid;
import com.mygdx.game.box2d.SimpleTest;
import com.mygdx.game.box2d.SphereStack;
import com.mygdx.game.box2d.VaryingRestitution;
import com.mygdx.game.box2d.VerticalStack;
import com.mygdx.game.utils.GdxTest;

import static com.badlogic.gdx.physics.box2d.Shape.Type.Chain;

public class Box2DTestCollection extends GdxTest implements InputProcessor, GestureListener {
private final Box2DTest[] tests = {new DebugRendererTest(), new CollisionFiltering(), new Chain(), new Bridge(),
new SphereStack(), new Cantilever(), new ApplyForce(), new ContinuousTest(), new Prismatic(), new CharacterCollision(),
new BodyTypes(), new SimpleTest(), new Pyramid(), new OneSidedPlatform(), new VerticalStack(), new VaryingRestitution(),
new ConveyorBelt()};

private int testIndex = 0;

private Application app = null;

@Override
public void render () {
tests[testIndex].render();
}

@Override
public void create () {
if (this.app == null) {
this.app = Gdx.app;
Box2DTest test = tests[testIndex];
test.create();
}

InputMultiplexer multiplexer = new InputMultiplexer();// 用来处理多个InputProcessor的情况
multiplexer.addProcessor(this);
multiplexer.addProcessor(new GestureDetector(this));// 第二个是gesture detector？
Gdx.input.setInputProcessor(multiplexer);
}

@Override
public void dispose () {
tests[testIndex].dispose();
}

@Override
public boolean keyDown (int keycode) {
tests[testIndex].keyDown(keycode);

return false;
}

@Override
public boolean keyTyped (char character) {
tests[testIndex].keyTyped(character);
return false;
}

@Override
public boolean keyUp (int keycode) {
tests[testIndex].keyUp(keycode);
return false;
}

@Override
public boolean touchDown (int x, int y, int pointer, int button) {
tests[testIndex].touchDown(x, y, pointer, button);
return false;
}

@Override
public boolean touchDragged (int x, int y, int pointer) {
tests[testIndex].touchDragged(x, y, pointer);
return false;
}

@Override
public boolean touchUp (int x, int y, int pointer, int button) {
tests[testIndex].touchUp(x, y, pointer, button);
return false;
}

@Override
public boolean mouseMoved (int x, int y) {
return false;
}

@Override
public boolean scrolled (int amount) {
return false;
}

@Override
public boolean touchDown (float x, float y, int pointer, int button) {
return false;
}

@Override
public boolean tap (float x, float y, int count, int button) {
app.log("TestCollection", "disposing test '" + tests[testIndex].getClass().getName());
tests[testIndex].dispose();
testIndex++;
if (testIndex >= tests.length) testIndex = 0;
Box2DTest test = tests[testIndex];
test.create();
app.log("TestCollection", "created test '" + tests[testIndex].getClass().getName());
return false;
}

@Override
public boolean longPress (float x, float y) {
return false;
}

@Override
public boolean fling (float velocityX, float velocityY, int button) {
return false;
}

@Override
public boolean pan (float x, float y, float deltaX, float deltaY) {
return false;
}

@Override
public boolean panStop (float x, float y, int pointer, int button) {
return false;
}

@Override
public boolean zoom (float originalDistance, float currentDistance) {
return false;
}

@Override
public boolean pinch (Vector2 initialFirstPointer, Vector2 initialSecondPointer, Vector2 firstPointer, Vector2 secondPointer) {
return false;
}

@Override
public void pinchStop () {
}
}