Piece overlap detection

there is 3 addition:
- `ArrayList getOccupation()` to get a list of all spot occupied by a piece
- Fixing a bug to rotate right where width and height where inverted
- Check if a piece is overlapping another when placing and refusing the
  placement if so

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;
         }
     }