// StringRoll2.java
// Draw Rolling String
// by nagatani@eken.phys.nagoya-u.ac.jp

import java.applet.Applet;
import java.awt.*;

public class StringRoll2 extends StringRoll {
	
	int	xPos,	yPos;

	StringRoll2 (Image imageString,
		     int heightString, int yOffset, Applet applet) {
		
		super (imageString, heightString, yOffset, applet);
		nMode = 0;
	}
	
	public void paint (Graphics g, Applet applet) {
		
		if (nMode == 1 && t != 0.0 ||
		    nMode == 2 ||
		    nMode == 3) {	// Displaying Mode
			g.drawImage (imageString,
				     xPos, yPos, applet);
		}
	}
	
	public void move () {
		
		if (nMode == 0) {	// Reset Mode
			t = 0.0;
			nMode ++;
			return;
		}
		if (nMode == 1) {	// Displaying Mode
			
			xPos = (int) (xWindow - t * (xWindow + xImage));
			yPos = (yWindow - yImage) / 2 + yOffset;
			
			t += 0.01;
			if (t >= 1.0) {
				t = 0.0;
				nMode ++;
			}
			return;
		}
		if (nMode == 2) {	// Sleeping Mode
			t += 0.01;
			if (t >= 0.2) {
				t = 0.0;
				nMode = 0;
			}
			return;
		}
	}
}