// File:    PointManager.java

import java.awt.*;
import java.util.*;

/** Manages all the ControlPoints. **/

public class PointManager {

  protected Vector points = new Vector();

  protected ControlPoint activePoint;

  protected Rectangle zone(ControlPoint cp) {
    return new Rectangle(cp.getPosition().x-7,
                         cp.getPosition().y-7,
                         15,15);
  }

  /** Adds a point to the manager. **/
  public void addPoint(ControlPoint cp) {
    points.addElement(cp);
  }

  /** Sets one point active. **/
  public void activatePoint(ControlPoint activePoint) {
    this.activePoint = activePoint;
  }

  /** Sets the position of the active point. **/
  public void setActivePoint(Point p) {
    activePoint.setPosition(p);
  }

  /** Checks whether a given point corresponds with a control
    point. **/
  public boolean isControlPoint(Point p) {
    Enumeration list = points.elements();
    while (list.hasMoreElements()) {
      if (zone((ControlPoint)list.nextElement()).inside(p.x,p.y))
        return true;
    }
    return false;
  }

  /** Returns the ControlPoint correspondint to a point. **/
  public ControlPoint getControlPoint(Point p) {
    Enumeration list = points.elements();
    ControlPoint cp;
    while (list.hasMoreElements()) {
      cp=(ControlPoint)list.nextElement();
      if (zone(cp).inside(p.x,p.y))
        return cp;
    }
    return null;
  }

  protected void drawPoint(Graphics g, ControlPoint cp) {
    int x = cp.getPosition().x;
    int y = cp.getPosition().y;
    g.setColor(Color.white);
    g.fillRect(x-3,y-3,5,5);
    g.setColor(Color.black);
    g.drawRect(x-3,y-3,5,5);
  }

  /** Draws all the points. **/
  public void paint(Graphics g) {
    Enumeration list = points.elements();
    while (list.hasMoreElements()) {
      drawPoint(g,(ControlPoint)list.nextElement());
    }
  }

}