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;
}