started with the TicTacToe_MinMax Project. Finished the rendering of the game.

TODO: Make a playable version and add MinMax

TicTacToe_MinMax/TicTacToe_MinMax.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

TicTacToe_MinMax/src/Game.java

@@ -0,0 +1,41 @@
+import javax.swing.*;
+
+public class Game {
+
+    public void place(int player, int position, int[] playfield){
+        if (playfield[position] == -1){
+            playfield[position] = player;
+        } else {
+            JOptionPane.showConfirmDialog(null,"Tile is already taken");
+        }
+    }
+
+    private boolean checkWin(int[] playfield){
+        for (int i = 0; i < 3; i++){
+            if ((playfield[i] == playfield[i+3]) && (playfield[i] == playfield[i+6])){
+                System.out.println("vertical");
+                return true;
+            } else if ((playfield[i*3] == playfield[i*3+1]) && (playfield[i*3] == playfield[i*3+2])){
+                System.out.println("horizontal");
+                return true;
+            }
+        }
+        return (playfield[2] == playfield[4]) && (playfield[2] == playfield[6]) || (playfield[0] == playfield[4]) && (playfield[0] == playfield[8]);
+    }
+
+
+    public static void main(String[] args) {
+        Game game = new Game();
+        Render render = new Render();
+
+        int[] playfield = {1,0,-1,1,1,0,-1,0,1};
+
+        SwingUtilities.invokeLater(new Runnable() {
+            public void run() {
+                render.createUI(playfield);
+            }
+        });
+
+        System.out.println(game.checkWin(playfield));
+    }
+}

TicTacToe_MinMax/src/Render.java

@@ -0,0 +1,135 @@
+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+
+public class Render {
+
+    public static void createUI(int[] playfield){
+        JFrame f = new JFrame("Swing Paint Demo");
+        MyPanel myPanel = new MyPanel(playfield);
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.add(myPanel);
+        f.pack();
+        f.setLocationRelativeTo(null);
+        f.setVisible(true);
+    }
+
+}
+
+class MyPanel extends JPanel {
+    Grid grid;
+    GameCharacters gameCharacters;
+
+    public MyPanel() {
+        setBorder(BorderFactory.createLineBorder(Color.BLACK));
+        grid = new Grid();
+    }
+
+    public MyPanel(int[] playfield){
+        setBorder(BorderFactory.createLineBorder(Color.BLACK));
+        grid = new Grid();
+        gameCharacters = new GameCharacters(playfield);
+    }
+
+    public Dimension getPreferredSize() {
+        return new Dimension(900,900);
+    }
+
+    public void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        grid.paintGrid(g);
+        gameCharacters.paintGameCharacters(g);
+    }
+}
+
+class Grid{
+    private final int TILE_X = 300;
+    private final int TILE_Y = 300;
+
+    public void paintGrid(Graphics g){
+        g.setColor(Color.BLACK);
+        //horizontal
+        for (int i = 1; i < 3; i++) {
+            Graphics2D g2d = (Graphics2D)g;
+            g2d.setStroke(new BasicStroke(5));
+            g2d.drawLine(0, TILE_Y*i, TILE_X*3, TILE_Y*i);
+        }
+        //vertical
+        for (int i = 1; i < 3; i++){
+            Graphics2D g2d = (Graphics2D)g;
+            g2d.setStroke(new BasicStroke(5));
+            g2d.drawLine(TILE_X*i, 0, TILE_X*i, TILE_Y*3);
+        }
+    }
+}
+
+class GameCharacters {
+    CharacterX characterX = new CharacterX();
+    CharacterO characterO = new CharacterO();
+
+    private final int TILE_X = 300;
+    private final int TILE_Y = 300;
+
+    int[] playfield;
+
+    public GameCharacters(int[] playfield) {
+        this.playfield = playfield;
+    }
+
+    public void paintGameCharacters(Graphics g) {
+        int actions = 0;
+        for (int column = 0; column < 3; column++) {
+            for (int row = 0; row < 3; row++) {
+                if (playfield[actions] == 1) {
+                    characterX.setX(TILE_X * row);
+                    characterX.setY(TILE_Y * column);
+                    characterX.paintX(g);
+                } else if (playfield[actions] == -1) {
+                    characterO.setX(TILE_X * row);
+                    characterO.setY(TILE_Y * column);
+                    characterO.paintO(g);
+                }
+                actions++;
+            }
+        }
+    }
+
+    class CharacterX {
+        private int x;
+        private int y;
+
+        public void paintX(Graphics g) {
+            Graphics2D g2d = (Graphics2D)g;
+            g2d.setStroke(new BasicStroke(10));
+            g2d.drawLine(x+25, y+25, x+275, y+275);
+            g2d.drawLine(x+25, y +275, x+275, y+25);
+        }
+
+        public void setX(int x) {
+            this.x = x;
+        }
+
+        public void setY(int y) {
+            this.y = y;
+        }
+    }
+
+    class CharacterO {
+        private int x;
+        private int y;
+
+        public void paintO(Graphics g) {
+            Graphics2D g2d = (Graphics2D)g;
+            g2d.setStroke(new BasicStroke(10));
+            g2d.drawOval(x + 25, y + 25, 250, 250);
+        }
+
+        public void setX(int x) {
+            this.x = x;
+        }
+
+        public void setY(int y) {
+            this.y = y;
+        }
+    }
+}