fixed GUI layout

fixed new button bug

src/GUI/DrawingArea.java

@@ -94,6 +94,8 @@ public class DrawingArea extends JPanel implements MouseMotionListener, MouseLis
     public void clear() {
 
         image = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
+        g2 = (Graphics2D) image.getGraphics();
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
         repaint();
 
     }