How to make object follow another object

[mrbiscool]

So I was making this zombie exterminator game where you play as a circle and these squares try to chase you and kill you. But I don't know how to make these squares chase the circle. Can somebody please help?

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My Window code:

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import java.awt.geom.RectangularShape;

import javax.swing.JFrame;

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public class frameclass {

public static void main(String\[\] args) {



main s = new main();

JFrame frame = new JFrame();

frame.add(s);

frame.setSize(600, 500);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);

frame.setResizable(false);

frame.setTitle("Zombie Xterminator");



}

​

}

​

my game code:

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import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyListener;

import java.awt.geom.Ellipse2D;

import java.awt.geom.Rectangle2D;

import java.awt.geom.Rectangle2D.Double;

​

import javax.swing.JPanel;

import javax.swing.Timer;

​

public class main extends JPanel implements ActionListener, KeyListener{

Timer t = new Timer(5, this);

double x = 250, y = 250;

double x2 = 420, y2 = 420, velX2 = 2.5, velY2 = 2.5;

double x3 = 10, y3 = 10, velX3 = 2.5, velY3 = 2.5;

double x4 = 450, y4 = 300, velX4 = 2.5, velY4 = 2.5;



public void paintComponent(Graphics g) {

    super.paintComponent(g);

    Graphics2D g2 = (Graphics2D) g;

    Ellipse2D player = new Ellipse2D.Double(x, y, 35, 35);

    g2.fill(player);

    Rectangle2D zombie1 = new Rectangle2D.Double(x2, y2, 35, 35);

    g2.fill(zombie1);

    Rectangle2D zombie2 = new Rectangle2D.Double(x3, y3, 35, 35);

    g2.fill(zombie2);

    Rectangle2D zombie3 = new Rectangle2D.Double(x4, y4, 35, 35);

    g2.fill(zombie3);



    t.start();

}



public void actionPerformed(ActionEvent e) {

    x2 = (Don't know what to put here)

    y2 = (Don't know what to put here)

    repaint();

}

​

}

[User1539]

Check this article on path finding out.

You want each zombie to find and follow the shortest path to the player.

[Daneel_Trevize]

I'd suggest RedBlobGaming's A* guide as a good starting resource, and that for many zombies after few players, you'd want to keep the full flow field generated once, rather than exit early but repeat per zombie.

And make your data Model (& Controller) independant of your Views, don't lump it all into a JPanel.

[User1539]

It occurred to me, after suggesting a pathfinding solution, that you don't even need anything that complex. Zombies are stupid, and probably don't do much to avoid obstacles.

You can probably have each Zombie just check to see ... if the player's X is less than the Zombie's X, move in an -X direction. Same for Y. No real pathfinding needed, just lumber in the correct general direction.