Class Spring

src/org/opensourcephysics/display/Spring.java:22–356

Draws a coil spring in a drawing panel. @author F. Esquembre @author W. Christian @version 1.0

 * @version 1.0
 */
public class Spring implements Measurable {
  private GeneralPath springPath = new GeneralPath();
  // Configuration variables
  protected boolean thinExtremes = true;
  protected boolean visible = true;
  protected int loops = -1, pointsPerLoop = -1;            // -1 to make sure the arrays are allocated
  protected float x = 0.0f, y = 0.0f;
  protected float sizex = 0.1f, sizey = 0.0f;

  /**
   * The radius of the spring (normal to its direction)
   */
  protected float radius = 0.1f;
  protected float solenoid = 0.0f;
  protected Color edgeColor = Color.BLACK;
  protected Stroke edgeStroke = new BasicStroke(1.0f);
  // Implementation variables
  protected boolean hasChanged = true, zeroLength = false; // Whether the element should recompute data that depends on position, size, scale, resolution, ...
  private int segments = 0;
  private float xPoints[] = null, yPoints[] = null;

  /**
   * Constructs a 0.1 radius Spring.
   */
  public Spring() {
    this(0.1);
  }

  /**
   * Special constructor that allows to specify the radius of the spring
   * @param _radius the radius of the spring (normal to its direction)
   */
  public Spring(double _radius) {
    setRadius(_radius);
    setResolution(8, 15);
  }

  // -------------------------------------
  // Configuration methods
  // -------------------------------------

  /**
   * Sets the X position of the origin of the spring
   * @param x double
   */
  public void setX(double x) {
    this.x = (float) x;
    hasChanged = true;
  }

  /**
   * Gets the X position of the origin of the spring
   * @return double
   */
  public double getX() {
    return this.x;
  }