/* mPoint.java */

import java.awt.*;

public class mPoint {
  int x, y;
  int dx = 2, dy = 2;
  Color color = Color.black;
  public mPoint(int _x, int _y) {
    /* initial location */
    x = _x;
    y = _y;
  }
  public void setDelta(int _dx, int _dy) {
    dx = _dx;
    dy = _dy;
  }
  public void setColor(Color _color) { color = _color;}
  /* check if object collide boundry */
  public void checkBoundry(Rectangle rect) {
    int nx = x+dx; /* caculate new location */
    int ny = y+dy;
    /* check if new location out of boundry */
    if ( (nx < rect.x) || (nx >= rect.x+rect.width) ) dx = -dx;
    if ( (ny < rect.y) || (ny >= rect.y+rect.height) ) dy = -dy;
  }
  /* move object */
  public void move(Graphics g) {
    paint(g);  /* use XOR to hide object */
    x += dx;    /* update location */
    y += dy;
    new_paint(g);   /* draw object on new location */
  }
  public void paint(Graphics g) {}
  public void new_paint(Graphics g) {}
}