package com.company;

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferStrategy;
import java.util.Calendar;


public class MyJFrame extends BetterJFrame {

    public static void main(String[] args) {
        MyJFrame jFrame = new MyJFrame();
        jFrame.startDrawingLoop();
    }

    int framesCount = 0;

    @Override
    public void myDraw(Graphics2D graphics, int dt) {
        //РИСОВАТЬ ТУТ
        framesCount++;
        graphics.setColor(Color.RED);
        graphics.setFont(new Font(null, 0, 50));
        graphics.drawString("Со старта программы прошло:" + getTimeFromStartMillis() + " мс.", 100, 100);
        graphics.drawString("Средний fps:" + framesCount / (getTimeFromStartMillis() / 1000.0), 100, 200);

        Calendar c = Calendar.getInstance();
        String time = "Время %d:%d:%d.%d";
        graphics.drawString(String.format(time, c.get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE), c.get(Calendar.SECOND), c.get(Calendar.MILLISECOND)), 100, 300);
    }
}


abstract class BetterJFrame extends JFrame {
    private long lastFrameEnd;
    private long startTime;

    public BetterJFrame() {
        setExtendedState(JFrame.MAXIMIZED_BOTH);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        createBufferStrategy(2);
        lastFrameEnd = System.currentTimeMillis();
        startTime = System.currentTimeMillis();

    }

    public void startDrawingLoop() {
        while (true) {
            long dt = System.currentTimeMillis() - lastFrameEnd;
            lastFrameEnd = System.currentTimeMillis();
            draw(dt);
        }
    }

    private void draw(long dt) {
        BufferStrategy bs = getBufferStrategy();
        Graphics2D bkG = (Graphics2D) bs.getDrawGraphics();

        bkG.clearRect(0, 0, getWidth(), getHeight());


        try {
            myDraw(bkG, (int) dt);
        } catch (Exception e) {
            e.printStackTrace();
        }

        bkG.dispose();
        bs.show();
        Toolkit.getDefaultToolkit().sync();
    }

    public int getTimeFromStartMillis() {
        return (int) (System.currentTimeMillis() - startTime);
    }

    public abstract void myDraw(Graphics2D graphics, int dt);
}