import com.sun.java.swing.*;
import java.awt.*;
import java.awt.geom.*;

/** An example of shear transformations with
 *  Java2D in Java 1.2.
 *  1998 Marty Hall, http://www.apl.jhu.edu/~hall/java/
 */

public class Shear extends JPanel {
  private static double gap=10, width=100;
  private Rectangle2D.Double rect =
    new Rectangle2D.Double(gap, gap, 100, 100);

  public void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    g2d.clearRect(0, 0,
                  getSize().width, getSize().height);
    for (int i=0; i<5; i++) {
      g2d.setPaint(Color.red);
      g2d.fill(rect);
      // Each new square gets 0.2 more x shear
      g2d.shear(0.2, 0.0);
      g2d.translate(2.0*gap + width, 0.0);
    }
  }

  public static void main(String[] args) {
    String title =
      "Shear: x shear ranges from 0.0 for the " +
      "leftmost 'square' to 0.8 for the " +
      "rightmost one.";
    WindowUtil.openInJFrame(new Shear(),
                            (int)(20.0*gap + 5.0*width),
                            (int)(5.0*gap + width),
                            title);
  }
}