Class TPoint

src/org/opensourcephysics/media/core/TPoint.java:61–752

This is a Point2D that implements the Interactive and Trackable interfaces with additional utility methods. Classes that extend TPoint should interpret the stored x and y values as image coordinates. TPoint has an empty draw method. @author Douglas Brown @version 1.0

 * @version 1.0
 */
@SuppressWarnings("serial")
public class TPoint extends Point2D.Double implements Interactive, Trackable {
	protected static boolean coordsVisibleInMouseBox = true;
	protected static XYCoordinateStringBuilder xyStringBuilder = new VidCartesianCoordinateStringBuilder();

	// instance fields
	protected boolean enabled = true;
	protected boolean trackEditTrigger = false;
	protected boolean coordsEditTrigger = false;
	protected boolean stepEditTrigger = false;
	protected boolean isAdjusting = false;
	protected Point screenPt;
	protected Point2D.Double worldPt;
	protected PropertyChangeSupport support;
	protected TPoint attachedTo;
	protected double prevX = java.lang.Double.NaN, prevY = java.lang.Double.NaN;

	/**
	 * Constructs a TPoint with image coordinates (0, 0).
	 */
	public TPoint() {
		this(0, 0);
	}

	/**
	 * Constructs a TPoint with specified image coordinates.
	 *
	 * @param x the x coordinate
	 * @param y the y coordinate
	 */
	public TPoint(double x, double y) {
		super(x, y);
	}

	/**
	 * Constructs a TPoint with image coordinates specified by a Point2D (commonly
	 * another TPoint).
	 *
	 * @param point the Point2D
	 */
	public TPoint(Point2D.Double point) {
		this(point.x, point.y);
	}

	/**
	 * Empty draw method. This method should be overridden by subclasses.
	 *
	 * @param panel the drawing panel requesting the drawing
	 * @param _g    the graphics context on which to draw
	 */
	@Override
	public void draw(DrawingPanel panel, Graphics _g) {

		/** implemented in subclasses */
	}

	/**
	 * Returns null. This method should be overridden by subclasses.