implement resize feature

src/main/java/ovh/gasser/newshapes/shapes/AbstractShape.java

@@ -34,6 +34,45 @@ public abstract class AbstractShape implements Shape {
         getBounds().translate(dx, dy);
     }
 
+    @Override
+    public void resize(ResizeHandle handle, int dx, int dy) {
+        Rectangle bounds = getBounds();
+        switch (handle) {
+            case E -> bounds.width += dx;
+            case W -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+            }
+            case S -> bounds.height += dy;
+            case N -> {
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+            case SE -> {
+                bounds.width += dx;
+                bounds.height += dy;
+            }
+            case SW -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+                bounds.height += dy;
+            }
+            case NE -> {
+                bounds.width += dx;
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+            case NW -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+        }
+        if (bounds.width < 1) bounds.width = 1;
+        if (bounds.height < 1) bounds.height = 1;
+    }
+
     @Override
     public Rectangle getBounds() {
         return this.bounds;