Examples of com.badlogic.gdx.math.Matrix4

com.badlogic.gdx.math.Matrix4
kipedia.org/wiki/Row-major_order#Column-major_order">column major 4 by 4 matrix. Like the {@link Vector3} class it allows the chaining of methods by returning a reference to itself. For example:
```
 Matrix4 mat = new Matrix4().trn(position).mul(camera.combined); 
```
@author badlogicgames@gmail.com

  
  /** Time step, DO NOT CHANGE MANUALLY */
  public float deltaTime, deltaTimeSqr;
  
  public ParticleController(){
    transform = new Matrix4();
    scale = new Vector3(1,1,1);
    influencers = new Array<Influencer>(true, 3, Influencer.class);
    setTimeStep(DEFAULT_TIME_STEP);
  }

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  /** Calculates window scissor coordinates from local coordinates using the batch's current transformation matrix.
   * @see ScissorStack#calculateScissors(Camera, float, float, float, float, Matrix4, Rectangle, Rectangle) */
  public void calculateScissors (Rectangle localRect, Rectangle scissorRect) {
    viewport.calculateScissors(batch.getTransformMatrix(), localRect, scissorRect);
    Matrix4 transformMatrix;
    if (debugShapes != null && debugShapes.isDrawing())
      transformMatrix = debugShapes.getTransformMatrix();
    else
      transformMatrix = batch.getTransformMatrix();
    viewport.calculateScissors(transformMatrix, localRect, scissorRect);

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    init();
  }


  private void init () {
    // create the isometric transform
    isoTransform = new Matrix4();
    isoTransform.idt();


    // isoTransform.translate(0, 32, 0);
    isoTransform.scale((float)(Math.sqrt(2.0) / 2.0), (float)(Math.sqrt(2.0) / 4.0), 1.0f);
    isoTransform.rotate(0.0f, 0.0f, 1.0f, -45);


    // ... and the inverse matrix
    invIsotransform = new Matrix4(isoTransform);
    invIsotransform.inv();
  }

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    Vector2 d = new Vector2(vec.x - orig.x, -(vec.y - orig.y));
    return d.angle();
  }


  private Vector3 calculateDirection (float angle) {
    Matrix4 transform = new Matrix4();
    Vector3 dir = new Vector3(-1, 0, 1).nor();
    float rotAngle = (float)Math.toDegrees(Math.asin(Math.tan(Math.toRadians(angle))));
    transform.setToRotation(new Vector3(1, 0, 1).nor(), angle);
    dir.mul(transform).nor();
    return dir;
  }

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  public void draw (SpriteBatch batch, float parentAlpha) {
    validate();


    NinePatch handle = style.handle;
    applyTransform(batch);
    Matrix4 transform = batch.getTransformMatrix();
    if (firstWidget != null) {
      ScissorStack.calculateScissors(stage.getCamera(), transform, firstWidgetBounds, firstScissors);
      if (ScissorStack.pushScissors(firstScissors)) {
        drawChild(firstWidget, batch, parentAlpha);
        ScissorStack.popScissors();

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