package horstmann.ch09_animation1;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComponent;

/**
   This component draws an array and marks two elements in the
   array.
 */
@SuppressWarnings("serial")
public class ArrayComponent extends JComponent
{
	public synchronized void paintComponent(Graphics g)
	{
		if (values == null) return;
		Graphics2D g2 = (Graphics2D) g;
		int width = getWidth() / values.length;
		for (int i = 0; i < values.length; i++)
		{
			Double v =  values[i];
			Rectangle2D bar = new Rectangle2D.Double(
					width * i, 0, width, v);
			if (v == marked1 || v == marked2)
				g2.fill(bar);
			else
				g2.draw(bar);
		}
	}

	/**
      Sets the values to be painted.
      @param values the array of values to display
      @param marked1 the first marked element
      @param marked2 the second marked element
	 */
	public synchronized void setValues(Double[] values,
			Double marked1, Double marked2)
	{
		this.values = values.clone();
		this.marked1 = marked1;
		this.marked2 = marked2;
		repaint();
	}

	private Double[] values;
	private Double marked1;
	private Double marked2;
}