package asd;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.math.*;

public class Transforms2D extends JPanel {

    private class Display extends JPanel {
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.translate(300, 300);  // Moves (0,0) to the center of the display.
            int whichTransform = transformSelect.getSelectedIndex();


//          // TODO Apply transforms here, depending on the value of whichTransform!
//          int[] xpoints = new int[5];
//          int[] ypoints = new int[5];
//
//          for(int i = 1 ; i<=5;i++)
//          {
//              xpoints[i-1]= (int) (150*Math.sin((2*Math.PI/5)*i));
//          }
//
//          for(int i = 1 ; i<=5;i++)
//          {
//              ypoints[i-1]= (int) (150*Math.cos((2*Math.PI/5)*i));
//          }
//          Polygon polygon = new Polygon(xpoints,ypoints,5);
//
//          switch(whichTransform)
//          {
//              case 0:
//              g2.drawPolygon(polygon);
//              break;
//          case 1:
//              g2.scale(0.5,0.5);
//              g2.drawPolygon(polygon);
//             break;
//          case 2:
//              g2.rotate(Math.toRadians(45));
//              g2.drawPolygon(polygon);
//              break;
//              case 3:
//
//                  int[] bufor = xpoints;
//                  xpoints = ypoints;
//                  ypoints = bufor;
//                  polygon = new Polygon(xpoints,ypoints,5);
//                  g2.drawPolygon(polygon);
//                  break;
//          }

            switch (whichTransform) {
                case 0:
                    g2.drawImage(pic, -200, -150, null);
                    break;
                case 1:
                    g2.scale(0.5, 0.5);
                    g2.drawImage(pic, -200, -150, null);
                    break;
                case 2:
                    g2.rotate(Math.toRadians(45));
                    g2.drawImage(pic, -200, -150, null);
                    break;
                case 3:
                    g2.scale(0.5, -1.0);
                    g2.drawImage(pic, -200, -150, null);
                    break;
                case 4:
                    g2.shear(0,2.0);
                    g2.drawImage(pic, -200, -150, null);
                    break;
            }


        }
    }

    private Display display;
    private BufferedImage pic;
    private JComboBox<String> transformSelect;

    public Transforms2D() throws IOException {
        pic = ImageIO.read(new File("shuttle.jpg"));
        display = new Display();
        display.setBackground(Color.YELLOW);
        display.setPreferredSize(new Dimension(600, 600));
        transformSelect = new JComboBox<String>();
        transformSelect.addItem("None");
        for (int i = 1; i < 10; i++) {
            transformSelect.addItem("No. " + i);
        }
        transformSelect.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                display.repaint();
            }
        });
        setLayout(new BorderLayout(3, 3));
        setBackground(Color.GRAY);
        setBorder(BorderFactory.createLineBorder(Color.GRAY, 10));
        JPanel top = new JPanel();
        top.setLayout(new FlowLayout(FlowLayout.CENTER));
        top.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
        top.add(new JLabel("Transform: "));
        top.add(transformSelect);
        add(display, BorderLayout.CENTER);
        add(top, BorderLayout.NORTH);
    }


    public static void main(String[] args) throws IOException {
        JFrame window = new JFrame("2D Transforms");
        window.setContentPane(new Transforms2D());
        window.pack();
        window.setResizable(false);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        window.setLocation((screen.width - window.getWidth()) / 2, (screen.height - window.getHeight()) / 2);
        window.setVisible(true);
    }

}