Example usage for com.badlogic.gdx.physics.box2d Body getLinearVelocity

Introduction

In this page you can find the example usage for com.badlogic.gdx.physics.box2d Body getLinearVelocity.

Prototype

public Vector2 getLinearVelocity() 

Source Link

Usage

From source file:com.agateau.pixelwheels.racer.Racer.java

License:Open Source License

private void applySimplifiedRacerCollision(Racer other) {
    Body body1 = getVehicle().getBody();
    Body body2 = other.getVehicle().getBody();

    mTmp.set(body2.getLinearVelocity()).sub(body1.getLinearVelocity());
    float deltaV = mTmp.len();

    final float k = GamePlay.instance.simplifiedCollisionKFactor
            * MathUtils.clamp(deltaV / GamePlay.instance.simplifiedCollisionMaxDeltaV, 0, 1);
    mTmp.set(body2.getWorldCenter()).sub(body1.getWorldCenter()).nor().scl(k);

    body2.applyLinearImpulse(mTmp, body2.getWorldCenter(), true);
    mTmp.scl(-1);/*from   w w w . j  av  a2s . c om*/
    body1.applyLinearImpulse(mTmp, body1.getWorldCenter(), true);
}

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From source file:com.agateau.pixelwheels.racer.SpinningComponent.java

License:Open Source License

@Override
public void act(float delta) {
    if (!mActive) {
        return;/*  www.j  a va2  s.  com*/
    }
    Body body = mVehicle.getBody();

    // Slow down
    body.applyLinearImpulse(body.getLinearVelocity().nor().scl(-body.getMass()), body.getWorldCenter(), true);

    // Spin
    float nextAngle = body.getAngle() + body.getAngularVelocity() * GameWorld.BOX2D_TIME_STEP;
    if (nextAngle > mTargetBodyAngle) {
        stopSpinning();
        return;
    }

    float totalRotation = mTargetBodyAngle - nextAngle;
    float desiredAngularVelocity = totalRotation / GameWorld.BOX2D_TIME_STEP;
    if (desiredAngularVelocity < 0) {
        desiredAngularVelocity = MathUtils.clamp(desiredAngularVelocity, -MAX_ANGULAR_VELOCITY,
                -MIN_ANGULAR_VELOCITY);
    } else {
        desiredAngularVelocity = MathUtils.clamp(desiredAngularVelocity, MIN_ANGULAR_VELOCITY,
                MAX_ANGULAR_VELOCITY);
    }
    float impulse = body.getInertia() * (desiredAngularVelocity - body.getAngularVelocity());
    body.applyAngularImpulse(impulse, true);
}

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From source file:com.agateau.pixelwheels.utils.Box2DUtils.java

License:Open Source License

@SuppressWarnings("unused")
public static Vector2 getForwardVelocity(Body body) {
    Vector2 currentRightNormal = body.getWorldVector(FORWARD_VECTOR);
    float v = currentRightNormal.dot(body.getLinearVelocity());
    return currentRightNormal.scl(v);
}

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From source file:com.agateau.pixelwheels.utils.Box2DUtils.java

License:Open Source License

public static Vector2 getLateralVelocity(Body body) {
    Vector2 currentRightNormal = body.getWorldVector(LATERAL_VECTOR);
    float v = currentRightNormal.dot(body.getLinearVelocity());
    return currentRightNormal.scl(v);
}

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From source file:com.agateau.pixelwheels.utils.Box2DUtils.java

License:Open Source License

public static void applyDrag(Body body, float factor) {
    Vector2 dragForce = body.getLinearVelocity().scl(-factor);
    body.applyForce(dragForce, body.getWorldCenter(), true);
}

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From source file:com.blindtigergames.werescrewed.debug.SBox2DDebugRenderer.java

License:Apache License

protected void renderBody(Body body) {
    Transform transform = body.getTransform();
    int len = body.getFixtureList().size();
    List<Fixture> fixtures = body.getFixtureList();
    for (int i = 0; i < len; i++) {
        Fixture fixture = fixtures.get(i);

        if (drawBodies) {
            if (body.isActive() == false)
                drawShape(fixture, transform, SHAPE_NOT_ACTIVE);
            else if (body.getType() == BodyType.StaticBody)
                drawShape(fixture, transform, SHAPE_STATIC);
            else if (body.getType() == BodyType.KinematicBody)
                drawShape(fixture, transform, SHAPE_KINEMATIC);
            else if (body.isAwake() == false)
                drawShape(fixture, transform, SHAPE_NOT_AWAKE);
            else/*from  ww w  .j  a  va  2s .  c  o m*/
                drawShape(fixture, transform, SHAPE_AWAKE);

            if (drawVelocities) {
                Vector2 position = body.getPosition();
                drawSegment(position, body.getLinearVelocity().add(position), VELOCITY_COLOR);
            }
        }

        if (drawAABBs) {
            drawAABB(fixture, transform);
        }
    }
}

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From source file:com.dongbat.game.util.MovementUtil.java

public static void newMovementMechanism(World world, Entity e) {
    UnitMovement unitMovement = EntityUtil.getComponent(world, e, UnitMovement.class);

    Physics physicsComponent = EntityUtil.getComponent(world, e, Physics.class);
    Body body = physicsComponent.getBody();
    float mass = body.getMass();
    if (unitMovement.getDirectionVelocity() == null) {
        //      body.setLinearVelocity(new Vector2(0, 0));
        return;//from  w w  w. j av  a2s. co m
    }

    Vector2 directionVel = unitMovement.getDirectionVelocity().cpy();

    //heading
    float angleRad = body.getLinearVelocity().angleRad();
    body.setTransform(body.getPosition(), angleRad);

    // TODO: calculate based on radius, use fixed mass
    // or make a steering-like behavior with real mass
    float desiredSpd = calculalteDesiredSpeed(world, e);
    Vector2 currentVector = body.getLinearVelocity();
    directionVel.nor().scl(desiredSpd).sub(currentVector);

    Vector2 impulse = directionVel.scl(mass);

    PhysicsUtil.applyImpulse(world, e, impulse);
}

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From source file:com.dongbat.game.util.MovementUtil.java

/**
 * Move unit to specific location on map
 *
 * @param entity entity want to move//from w ww .  j  a  v a2  s.co m
 * @param destination location that entity will move to
 */
public static void moveTo(Entity entity, Vector2 destination) {
    World world = entity.getWorld();
    Physics physicsComponent = EntityUtil.getComponent(world, entity, Physics.class);
    Stats stat = EntityUtil.getComponent(world, entity, Stats.class);
    Body body = physicsComponent.getBody();
    float mass = body.getMass();
    Vector2 currentVelocity = body.getLinearVelocity();
    Vector2 position = body.getPosition();
    float scale = stat.getBaseMovementSpeed() + stat.getModifierSpeed();
    Vector2 desiredVelocity = destination.cpy().sub(position).nor().scl(scale);

    Vector2 impulse = desiredVelocity.sub(currentVelocity).scl(mass * 10);

    PhysicsUtil.applyImpulse(entity.getWorld(), entity, impulse);
}

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From source file:com.dongbat.invasion.util.MovementUtil.java

public static void moveTo(Entity entity, Vector2 destination) {
    Physics physicsComponent = EntityUtil.getComponent(entity, Physics.class);
    Body body = physicsComponent.getBody();
    float mass = body.getMass();
    Vector2 currentVelocity = body.getLinearVelocity();
    Vector2 position = body.getPosition();

    Vector2 desiredVelocity = destination.cpy().sub(position).nor().scl(physicsComponent.getMaxSpeed());

    Vector2 impulse = desiredVelocity.sub(currentVelocity).scl(mass);

    PhysicsUtil.applyImpulse(entity, impulse);
}

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From source file:com.gmail.emersonmx.asteroids.system.PhysicSystem.java

License:Open Source License

private void processOutputEntity(Entity entity) {
    TransformComponent transform = transformMapper.get(entity);
    PhysicBodyComponent bodyComponent = physicBodyMapper.get(entity);
    Body body = bodyComponent.body;

    Vector2 position = body.getPosition();
    transform.position = ConverterUtil.unitToPixel(position);
    transform.rotation = body.getAngle() * MathUtils.radiansToDegrees;
    System.out.println("velocity: " + body.getLinearVelocity());
}

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