start physics

src/main/java/core/Collidable.java

@@ -0,0 +1,5 @@
+package core;
+
+public interface Collidable {
+
+}

src/main/java/core/Master.java

@@ -3,8 +3,10 @@ package core;
 import objects.DebugPos;
 import objects.ships.BattleShip;
 import objects.GameObject;
+import objects.ships.Submarine;
 import objects.ships.Turret;
 import objects.world.Grid;
+import objects.world.Wall;
 
 import javax.swing.*;
 import java.awt.*;
@@ -44,6 +46,9 @@ public class Master extends JPanel {
         }
         objects.add(bs);
         objects.add(battleShip);
+
+        objects.add(new Submarine(new Vector2D(), new Vector2D(20, 20)));
+        objects.add(new Wall(20, 80, 50, 2));
     }
 
     /**

src/main/java/core/physics/Hitbox.java

@@ -0,0 +1,5 @@
+package core.physics;
+
+public abstract class Hitbox {
+
+}

src/main/java/core/physics/RectHitBox.java

@@ -0,0 +1,4 @@
+package core.physics;
+
+public class RectHitBox extends Hitbox{
+}

src/main/java/objects/GameObject.java

@@ -32,6 +32,10 @@ public abstract class GameObject {
     public abstract void draw(Graphics2D g2d, int w, Master master);
     public abstract void update(Master master);
 
+    public void moveTo(Vector2D target){
+        this.position = target;
+    }
+
 
     public double getMapCoords(double value, boolean isX){
         if (isX){

src/main/java/objects/ships/Submarine.java

@@ -1,18 +1,26 @@
 package objects.ships;
 
 import core.Master;
+import core.Vector2D;
 import objects.GameObject;
 
 import java.awt.*;
 
 public class Submarine extends GameObject {
+
+    public Submarine(Vector2D position, Vector2D size) {
+        super(position, size);
+    }
+
     @Override
     public void draw(Graphics2D g2d, int w, Master master) {
-
+        g2d.setPaint(Color.BLUE);
+        g2d.fillOval((int) (position.x - size.x / 2), (int) (position.y - size.y / 2), (int) size.x, (int) size.y);
     }
 
     @Override
     public void update(Master master) {
-
+        Point mouse = master.getMouseLocation();
+        moveTo(new Vector2D(mouse.x, mouse.y));
     }
 }

src/main/java/objects/world/Wall.java

@@ -0,0 +1,28 @@
+package objects.world;
+
+import core.Master;
+import objects.GameObject;
+
+import java.awt.*;
+
+public class Wall extends GameObject {
+
+    public Wall(double x, double y, double xSize, double ySize) {
+        super(x, y, xSize, ySize);
+    }
+
+    @Override
+    public void draw(Graphics2D g2d, int w, Master master) {
+        int xAbs = (int) getWorldCoords(position.x, true);
+        int yAbs = (int) getWorldCoords(position.y, false);
+        int sizeXAbs = (int) getWorldCoords(size.x, true);
+        int sizeYAbs = (int) getWorldCoords(size.y, false);
+
+        g2d.setPaint(Color.BLACK);
+        g2d.fillRect(xAbs, yAbs, sizeXAbs, sizeYAbs);
+    }
+
+    @Override
+    public void update(Master master) {
+    }
+}