import java.awt.*;

class MovingText extends Sprite {
	// This Sprite moves text by the specified dx/dy with each frame.
	// dx/dy are specified as pixels in the Java coordinate system.
	// positive dx moves the text to the right; negative dx moves the text to the  left
	// positive dy moves the text to the bottom; negative dx moves the text to the top
	// When the starting position of the text moves out of bounds,
	// the Sprite starts at its initial position again.
	
	private String text;
	private int startX;
	private int startY;
	private int dx;
	private int dy;
	private Font font;
	private Color color;
		
	// state variables
	private int currentX;
	private int currentY;
	
	public String name () {
		return "MovingText";
	}
	
	public String toString () {
		return name() + "[text="+this.text
										+ "; start=("+startX+","+startY+")"
										+ "; dx="+this.dx
										+ "; dy="+this.dy
										+ ";\n"
										+ "  font="+this.font
										+ "; color="+this.color
										+ "]";
	}
	
  public String getState () {
    return name() + "[currentX="+currentX
      + "; currentY="+currentY
      + "; bounds=("+this.width+","+this.height+")"
      + "]";
  }
  
  // constructors
  public MovingText (String t, int x, int y) {
    this.text = t;
		this.startX = x;
		this.startY = y;
		this.dx = 1;
		this.dy = 1;
    this.font = new Font("Helvetica", Font.BOLD, 16);
		this.color = Color.black;
		this.resetState();
	}
	
	public MovingText (String t, int x, int y, int dx, int dy, Color c) {
		this(t,x,y);
		this.dx = dx;
		this.dy = dy;
		this.color = c;
	}
	
	public void setFont (Font f) {
		this.font = f;
	}
		
	// required Sprite methods
	protected void resetState () {
		this.currentX = this.startX;
		this.currentY = this.startY;
	}
	
	protected void drawState (Graphics g) {
		g.setColor(this.color);
		g.setFont(this.font);
		g.drawString(this.text, currentX, currentY);
	}
	
	protected void updateState () {
		this.currentX+=this.dx;
		this.currentY+=this.dy;
		
		// if words go off the screen, start at initial position again
		if ((currentX<0) || (currentY<0)) {
			resetState();
		} else if ((currentY>this.height) || (currentX>this.width)) {
			resetState();
		}
	}
	
}