package com.example;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferStrategy;
import java.util.concurrent.ThreadLocalRandom;

public class MyCanvas extends Canvas {
    private static final double dotSize = 25;
    private int tryBall = 50;
    private Color tryBallColor = Color.RED;
    private Dot[] population;

    MyCanvas(int populationSize){
        setIgnoreRepaint(true);
        population = new Dot[populationSize];
        for(int i = 0; i < populationSize; ++i){
            double x = ThreadLocalRandom.current().nextDouble(560);
            double y = ThreadLocalRandom.current().nextDouble(360);
            population[i] = new Dot(x, y, dotSize);
        }
        Chrono chrono = new Chrono(this);
        new Timer(16, chrono).start();
    }

    public void myRepaint(){
        int tryX = ThreadLocalRandom.current().nextInt(560);
        int tryY = ThreadLocalRandom.current().nextInt(360);
        BufferStrategy strategy = getBufferStrategy();
        Graphics2D graphics2D = (Graphics2D) strategy.getDrawGraphics();
        graphics2D.setColor(Color.BLACK);
        for(Dot dot : population) {
            double x = dot.getX();
            double y = dot.getY();
            double radius = dot.getRadius();
            Ellipse2D.Double drawableDot = new Ellipse2D.Double(x, y, radius, radius);
            graphics2D.fill(drawableDot);
        }
        Ellipse2D.Double tryDot = new Ellipse2D.Double(tryX, tryY, tryBall, tryBall);
        graphics2D.setColor(Color.RED);
        graphics2D.fill(tryDot);
        if(graphics2D != null){
            graphics2D.dispose();
        }

        strategy.show();
        Toolkit.getDefaultToolkit().sync();
    }

    public void populationUpdate(){
        for(Dot dot : population){
            dot.move(10);
        }
        myRepaint();
    }
}