app/src/main/java/school_project/GameUI.java

@@ -53,9 +53,20 @@ public class GameUI extends Group{
                 _piece.setLayoutX(event.getSceneX() - piece_pos_click.x);
                 _piece.setLayoutY(event.getSceneY() - piece_pos_click.y);
             });
+            _piece.setOnMouseReleased(event -> {
+                if(event.getSceneX() > grid.getLayoutX() && event.getSceneX() < grid.getLayoutX() + grid.boundary_size.x
+                    && event.getSceneY() > grid.getLayoutY() && event.getSceneY() < grid.getLayoutY() + grid.boundary_size.y )
+                {
+                    // Inverted because screen is x →; y ↓ and matrix is x ↓; y →
+                    Vec2 piece_position_in_grid = new Vec2(
+                            (int) (_piece.getLayoutY() + (SEGMENT_SIZE+SPACE_SIZE)/2 - grid.getLayoutY())/(SEGMENT_SIZE+SPACE_SIZE),
+                            (int) (_piece.getLayoutX() + (SEGMENT_SIZE+SPACE_SIZE)/2 - grid.getLayoutX())/(SEGMENT_SIZE+SPACE_SIZE)
+                    );
+                    System.out.println(level.placePiece(p, piece_position_in_grid) + piece_position_in_grid.toString());
+                }
+            });
 
             getChildren().add(_piece);
         }
-
     }
-}
+}

app/src/main/java/school_project/Map.java

@@ -28,6 +28,46 @@ public class Map extends Shape{
             this.addPiece(p);
     }
 
+    /**
+     * try to place a piece on the map, return true if succeed and false if it failed
+     * @param piece the piece to place
+     * @param pos the position to place the piece in matrix position
+     * @return true if the piece can and is placed and false if it can't and won't not be palced
+     */
+    public boolean placePiece(Piece piece, Vec2 pos){
+
+        if(!pieces.contains(piece))
+            return false;
+
+        piece.setPosition(null);
+        // In the map limits
+        if (    pos.x + piece.height > height
+                || pos.y+piece.width > width
+                || pos.x < 0
+                || pos.y < 0)
+            return false;
+
+        ArrayList<Vec2> occupation = new ArrayList<>();
+        for(Piece p: pieces){
+            if(p.getPosition() == null || p == piece)
+                continue;
+            for (Vec2 o : p.getOccupation()) {
+                occupation.add(o);
+            }
+        }
+
+        for (int x = pos.x; x < pos.x + piece.height; x++) {
+            for (int y = pos.y; y < pos.y + piece.width; y++) {
+                if ((!getShape()[x][y] || occupation.contains(new Vec2(x, y))) && piece.getShape()[x - pos.x][y - pos.y]) {
+                    return false;
+                }
+            }
+        }
+
+        piece.setPosition(pos);
+        return true;
+    }
+
     /**
      * Return a matrix with all used space on the map to see if a piece can fit in a space
      *

app/src/main/java/school_project/Piece.java

@@ -3,6 +3,7 @@ package school_project;
 import javafx.scene.paint.Color;
 import javafx.scene.paint.Paint;
 
+import java.util.ArrayList;
 import java.util.Random;
 
 /**
@@ -39,6 +40,17 @@ public class Piece extends Shape{
         this.Position = position;
     }
 
+    public ArrayList<Vec2> getOccupation(){
+        ArrayList<Vec2> ret = new ArrayList<>();
+        for (int x = 0; x < height; x++) {
+            for (int y = 0; y < width; y++) {
+               if(getShape()[x][y]){
+                   ret.add(new Vec2(getPosition().x + x, getPosition().y + y));
+               }
+            }
+        }
+        return ret;
+    }
 
     /**
      * set the map the piece is into the the map argument
@@ -55,8 +67,6 @@ public class Piece extends Shape{
      */
     public void RotateRight(int times){
         while(times > 0) {
-            height = matrix.length;
-            width = matrix[0].length;
             boolean[][] temp_matrix = new boolean[width][height];
             for (int i = 0; i < width; i++) {
                 for (int j = 0; j < height; j++) {
@@ -65,6 +75,8 @@ public class Piece extends Shape{
             }
             times--;
             matrix = temp_matrix;
+            height = matrix.length;
+            width = matrix[0].length;
         }
     }