import java.awt.*;
import java.awt.geom.*;
import javax.swing.JComponent;

/**
 * @author Prof. Wittie
 * CS 203, Fall 2009
 */
/**
 * A vertical ruler with markings every 20 units.
 */
public class Ruler {
    private double height;
    private double xCoord;
    private double yCoord;

    /**
     * The ruler has these x and y coordinates at the top left corner
     * of its bounding box and has the given height.
     *
     * @param xCoord
     *            x coordinate of the bounding box
     * @param yCoord
     *            y coordinate of the bounding box
     * @param height
     *            height of the ruler
     */
    public Ruler(double xCoord, double yCoord, double height) {
        this.xCoord = xCoord;
        this.yCoord = yCoord;
	this.height = height;
    }

    /**
     * Draw the ruler at the current x and y coordinates
     *
     * @param g2
     *            the graphics context
     */
    public void draw(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
	
	Line2D.Double line 
	    = new Line2D.Double(xCoord, yCoord, xCoord, yCoord + height);
	g2.setColor(Color.BLUE);
	g2.draw(line);
	double i;
	for(i=yCoord; i<yCoord + height; i=i+20) {
	    g2.drawString("" + (int)i, (int)xCoord+2, (int)i);
	}
    }
}