Движение "стаи" обьектов

package com.display;
 
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.util.Arrays;
import java.util.Random;
 
import javax.swing.JFrame;
 
public abstract class Display {
    private static boolean created;
    private static JFrame window;
    private static Canvas content;
    // temp
    private static double deltaX = 0;
    private static double deltaY = 0;
    static Random rand = new Random();
    static double max = 0.1;
    static double min = 0.1;
    // temp
    private static BufferedImage buffer;
    private static int[] bufferData;
    private static int clearColor;
    private static Graphics bufferGraphics;
 
    public static void create(int width, int height, String title, int _clearColor) {
        if (created)
            return;
 
        window = new JFrame(title);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        content = new Canvas();
        Dimension size = new Dimension(width, height);
        content.setPreferredSize(size);
        window.setResizable(false);
        window.getContentPane().add(content);
        window.pack();
        window.setLocationRelativeTo(null);
        window.setVisible(true);
        buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        bufferData = ((DataBufferInt) buffer.getRaster().getDataBuffer()).getData();
        bufferGraphics = buffer.getGraphics();
        clearColor = _clearColor;
        created = true;
    }
 
    public static void clear() {
        Arrays.fill(bufferData, clearColor);
    }
 
    public static void render() {
        bufferGraphics.setColor(new Color(0xff0000ff));
        bufferGraphics.fillOval((int) (130 + (Math.sin(deltaX) * 120)), (int) (120 + Math.cos(deltaY) * 100), 60, 60);
        
        bufferGraphics.fillOval((int) (130 + (Math.sin(deltaX) * 40)), (int) (120 + Math.cos(deltaY) * 80), 60, 60);
        
        deltaX += (float) (Math.random() * (min));
        deltaY += (float) (Math.random() * (max));
    }
 
    public static void swapBuffer() {
        Graphics g = content.getGraphics();
        g.drawImage(buffer, 0, 0, null);
    }
}

package com.main;
 
import java.awt.event.ActionEvent;
 
import javax.swing.AbstractAction;
import javax.swing.Timer;
 
import com.display.Display;
 
public class Main {
    public static void main(String[] args) {
        Display.create(400, 300, "шарики",0xff00ff00);
 
        Timer t = new Timer(1000/60, new AbstractAction() {
 
            @Override
            public void actionPerformed(ActionEvent e) {
             Display.clear();
             Display.render();
             Display.swapBuffer();}
        });
        t.setRepeats(true);
        t.start();
    }
}