import java.awt.*;

public class mPoint {

  // Instance variables:
  int x, y, dx, dy;
  Color color;
  
  // Constructor:
  public mPoint(int _x,int _y) {
    x =_x; y = _y;
    dx = 1; dy = 1;
    color = Color.black;
  }
  
  // Encapsulate the instance variables:
  public void setPoint(int _x, int _y) {
    x = _x; y = _y;
  }
  public void setDelta(int _dx, int _dy) {
    dx = _dx; dy = _dy;
  }
  public void setColor(Color _color) {
    color = _color;
  }

  // Class methods:
  public void move(Graphics g) {
    x += dx; y += dy;
    paint(g);
  }
  public void paint(Graphics g) {
    g.fillOval(x, y, 3, 3);  // not used!
  }
  public void checkBoundary(Rectangle rect) {
    // Calculate new location:
    int nx = x + dx, ny = y + dy;
    // Check if new location out of bounds:
    if ( (nx < rect.x) || (nx >= rect.x + rect.width) ) dx = -dx;
    if ( (ny < rect.y) || (ny >= rect.y + rect.height) ) dy = -dy;
  }

} // end of mPoint class