Question

$\color{blue}Fill\;onGroup\;method..$

package edu.luc.etl.cs313.android.shapes.model;

import java.util.List;

/**
 * A shape visitor for calculating the bounding box, that is, the smallest
 * rectangle containing the shape. The resulting bounding box is returned as a
 * rectangle at a specific location.
 */
public class BoundingBox implements Visitor<Location> {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return f.getShape().accept(this);
   }

   @Override
   public Location onGroup(final Group g) {
      // Fill this method
   }

   @Override
   public Location onLocation(final Location l) {
      Location location = l.shape.accept(this);
      return new Location(l.x+location.x, l.y+location.y, location.shape);
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return new Location(0, 0, new Rectangle(r.getWidth(), r.getHeight()));
   }

   @Override
   public Location onStroke(final Stroke c) {
      return c.getShape().accept(this);
   }

   @Override
   public Location onOutline(final Outline o) {
      return o.getShape().accept(this);
   }

   @Override
   public Location onPolygon(final Polygon s) {
      // Fill this method
   }
}

Answer 1

package edu.luc.etl.cs313.android.shapes.model;

import java.util.List;

/**
 * A shape visitor for calculating the bounding box, that is, the smallest
 * rectangle containing the shape. The resulting bounding box is returned as a
 * rectangle at a specific location.
 */
public class BoundingBox implements Visitor<Location> {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return f.getShape().accept(this);
   }

   @Override
   public Location onGroup(final Group g) {
      int xMin=0, xMax=0, yMin=0, yMax=0;
      int count = 0;
      Location location;
      Rectangle rectangle;
      for(Shape shape : g.shapes) {
         location = shape.accept(this);
         rectangle = (Rectangle) location.shape;
         if(count == 0) {
            xMin = location.x;
            xMax = location.x + rectangle.width;
            yMin = location.y;
            yMax = location.y + rectangle.height;
         } else {
            if(location.x < xMin) {
               xMin = location.x;
            }
            if(location.y < yMin) {
               yMin = location.y;
            }
            if(location.x + rectangle.width > xMax) {
               xMax = location.x + rectangle.width;
            }
            if(location.y + rectangle.height > yMax) {
               yMax = location.y + rectangle.height;
            }
         }
         count++;
      }
      return new Location(xMin, yMin, new Rectangle(xMax-xMin, yMax-yMin));
   }

   @Override
   public Location onLocation(final Location l) {
      Location location = l.shape.accept(this);
      return new Location(l.x+location.x, l.y+location.y, location.shape);
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return new Location(0, 0, new Rectangle(r.getWidth(), r.getHeight()));
   }

   @Override
   public Location onStroke(final Stroke c) {
      return c.getShape().accept(this);
   }

   @Override
   public Location onOutline(final Outline o) {
      return o.getShape().accept(this);
   }

   @Override
   public Location onPolygon(final Polygon s) {
      int xMin=0, xMax=0, yMin=0, yMax=0;
      int count = 0;
      Point point;
      for(Shape shape : s.shapes) {
         point = (Point) shape;
         if(count == 0) {
            xMin = point.x;
            xMax = point.x;
            yMin = point.y;
            yMax = point.y;
         } else {
            if(point.x < xMin) {
               xMin = point.x;
            }
            if(point.y < yMin) {
               yMin = point.y;
            }
            if(point.x > xMax) {
               xMax = point.x;
            }
            if(point.y > yMax) {
               yMax = point.y;
            }
         }
         count++;
      }
      return new Location(xMin, yMin, new Rectangle(xMax-xMin, yMax-yMin));
   }
}