import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.awt.*;

/** An example that demonstrates 2D drawing in in Swing. */

/** Exercises: 
  *   - (easy) add a "clear" button
  *   - (easy) add a "quit"  button 
  *   - (easy) add a main method
  *   - (harder) detect left mouse clicks in the drawing panel
  *     and print out their coordinates.
  *   - (hardest) insert shapes at mouse click locations
  */
class DrawingExample extends JFrame implements ActionListener {
  private JButton b1, b2, b3, b4, b5;
  private DrawingPanel drawingPanel;
  
  public DrawingExample() {
    super("Drawing Example");

    b1 = new JButton("Line"); 
    b2 = new JButton("Square");
    b3 = new JButton("Triangle");
    b4 = new JButton("Oval");
    b5 = new JButton("Text");

    
    b1.addActionListener(this);
    b2.addActionListener(this);
    b3.addActionListener(this);
    b4.addActionListener(this);
    b5.addActionListener(this);
    
    this.setSize(200,200);
    
    drawingPanel = new DrawingPanel();
    drawingPanel.setBackground(Color.white);
    
    JPanel eastPanel = new JPanel();
    eastPanel.setBorder(BorderFactory.createTitledBorder("Controls"));
    eastPanel.setLayout(new GridLayout(5,1));
    
    eastPanel.add(b1); 
    eastPanel.add(b2);
    eastPanel.add(b3); 
    eastPanel.add(b4); 
    eastPanel.add(b5); 
    
    JComponent panel = (JComponent)this.getContentPane();
    TitledBorder title = BorderFactory.createTitledBorder("Drawing");
    title.setTitlePosition(TitledBorder.BOTTOM);
    panel.setBorder(title);
    
    panel.setLayout(new BorderLayout());
    panel.add(drawingPanel, BorderLayout.CENTER);
    panel.add(eastPanel, BorderLayout.EAST);
    
    this.setVisible(true);
    
  }
  
  // class that demonstrates some of the drawing 
  // capabilities of Java.
  private static class DrawingPanel extends JPanel {
    boolean drawLine = false;
    boolean drawSquare = false;
    boolean drawTriangle = false;
    boolean drawOval = false;
    boolean drawText = false;
    
    // override this method to perform custom drawing.
    public void paintComponent(Graphics gc) {
      super.paintComponent(gc);
      
      if (drawLine) {
        gc.drawLine(10,10, 100,100);
      }
      
      if (drawSquare) {
        gc.drawRect(50,10, 35, 35);
      }
      
      if (drawTriangle) {
        Polygon triangle = new Polygon();
        triangle.addPoint(20,70);
        triangle.addPoint(40,110);
        triangle.addPoint(70,90);
        gc.drawPolygon(triangle);
      }
      
      if (drawOval) {
        gc.drawOval(50,50, 25, 75);
      }

      if (drawText) {
        gc.drawString("CIS 120", 20, 150);
      }
    }
  }
  
  public void actionPerformed(ActionEvent e) {
    JButton source = (JButton)e.getSource();
    if (source.equals(b1)) {
      drawingPanel.drawLine = true;
    } else if (source.equals(b2)) {
      drawingPanel.drawSquare = true;
    } else if (source.equals(b3)) {
      drawingPanel.drawTriangle = true;
    } else if (source.equals(b4)) {
      drawingPanel.drawOval = true;
    } else if (source.equals(b5)) {
      drawingPanel.drawText = true;
    }
    
    drawingPanel.repaint();
  }
  
}