package com.knutejohnson.aviation.gload;

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

public class BankAngle extends JPanel {
    public static final Font SMALL = new Font("SansSerif",Font.PLAIN,20);
    public static final Font LARGE = new Font("SansSerif",Font.PLAIN,32);

    private int bankAngle;

    public BankAngle() {
        setLayout(new GridBagLayout());
        setBorder(BorderFactory.createLineBorder(Color.BLUE));

        GridBagConstraints c = new GridBagConstraints();
        c.gridx = 0;  c.insets = new Insets(2,2,2,2);
        c.fill = GridBagConstraints.HORIZONTAL;

        AirplaneSymbol as = new AirplaneSymbol();
        add(as,c);

        JLabel l = new JLabel("Bank Angle",JLabel.CENTER);
        add(l,c);

        final JSlider bank = new JSlider(0,89,0);
        bank.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent ce) {
                bankAngle = bank.getValue();
                repaint();
            }
        });
        bank.setMajorTickSpacing(10);
        bank.setMinorTickSpacing(1);
        bank.setPaintLabels(true);
        bank.setPaintTicks(true);
        @SuppressWarnings("unchecked")
        Hashtable<Integer,JComponent> h = bank.createStandardLabels(10,0);
        h.put(89,new JLabel("89"));
        bank.setLabelTable(h);
        add(bank,c);
    }

    class AirplaneSymbol extends JPanel {

        public AirplaneSymbol() {
            setPreferredSize(new Dimension(400,300));
        }

        public void paintComponent(Graphics g2d) {
            Graphics2D g = (Graphics2D)g2d;
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
             RenderingHints.VALUE_ANTIALIAS_ON);

            int w = getWidth();
            int h = getHeight();

            int[] wx = { w/2-150,w/2,w/2+150,w/2+150,w/2,w/2-150 };
            int[] wy = { h/2+1,h/2+5,h/2+1,h/2-1,h/2-5,h/2-1 };
            Polygon wings = new Polygon(wx,wy,wx.length);

            int[] tx = { w/2-2,w/2,w/2+1,w/2+4 };
            int[] ty = { h/2,h/2-70,h/2-70,h/2 };
            Polygon tail = new Polygon(tx,ty,tx.length);

            // draw background
            g.setColor(Color.WHITE);
            g.fillRect(0,0,w,h);

            // calculate angle in radians
            double theta = bankAngle / 360.0 * 2.0 * Math.PI;
            // calculate g load
            double gload = 1.0 / Math.cos(theta);
            // calculate stall speed in percent
            double stall = Math.sqrt(gload) * 100.0;

            // draw g load and stall speed
            g.setColor(Color.BLACK);
            g.setFont(SMALL);
            g.drawString("Load Factor",5,20);
            g.drawString("Stall Speed",290,20);
            g.setFont(LARGE);
            g.drawString(String.format("%5.2fG",gload),5,50);
            g.drawString(String.format("%3.0f%%",stall),290,50);

            // rotate the airplane
            g.rotate(theta,w/2,h/2);

            // draw the airplane
            g.setColor(Color.BLUE);
            g.fillOval(w/2-20,h/2-20,40,40);
            g.fillPolygon(wings);
            g.fillPolygon(tail);
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new JFrame("Bank Angle G-Load Calculator");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                BankAngle ba = new BankAngle();
                f.add(ba,BorderLayout.CENTER);
                f.pack();
                f.setVisible(true);
            }
        });
    }
}