Class Camera

src/org/opensourcephysics/display3d/simple3d/Camera.java:15–463

import org.opensourcephysics.numerics.VectorMath;

public class Camera implements org.opensourcephysics.display3d.core.Camera {
  static private final double ratioToScreen = 2.5, ratioToFocus = 2.0;
  static private final double[] vertical = {0, 0, 1};
  static final int CHANGE_ANY = 0;
  static final int CHANGE_MODE = 1;
  static final int CHANGE_POSITION = 2;
  static final int CHANGE_FOCUS = 3;
  static final int CHANGE_ROTATION = 4;
  static final int CHANGE_SCREEN = 5;
  static final int CHANGE_ANGLES = 6;
  // Configuration variables
  private int projectionMode = org.opensourcephysics.display3d.core.Camera.MODE_PERSPECTIVE;
  private double posX, posY, posZ;
  private double focusX, focusY, focusZ;
  private double distanceToScreen, rotationAngle = 0;
  private double alpha = 0.0, beta = 0.0;
  // Implementation variables
  private double distanceToFocus, panelMaxSizeConstant;
  double cosAlpha = 1, sinAlpha = 0, cosBeta = 1, sinBeta = 0;
  private double cosRot = 1, sinRot = 0;
  private double[] e1, e2, e3;
  private Projection projection = new Projection();
  private Quaternion rotation = new Quaternion(1, 0, 0, 0);

  /**
   * The DrawingPanel3D to which it belongs.
   * This is needed to report to it any change that implies a call to update()
   */
  private DrawingPanel3D panel;

  Camera(DrawingPanel3D aPanel) {
    this.panel = aPanel;
  }

  /**
   * Only for the use of the XMLLoader for DrawingPanel3D!
   * Sets the panel of this camera
   * @param aPanel DrawingPanel3D
   */
  void setPanel(DrawingPanel3D aPanel) {
    this.panel = aPanel;
  }

  // -----------------------------
  // Implementation of Camera
  // ----------------------------
  @Override
public void setProjectionMode(int mode) {
    projectionMode = mode;
    if(panel!=null) {
      panelMaxSizeConstant = panel.getMaximum3DSize()*0.01;
      panel.cameraChanged(CHANGE_MODE);
    }
  }

  @Override
final public int getProjectionMode() {
    return projectionMode;