import java.util.*;

class Frame {
    private ConsoleGraphics device;
    //private SwingGraphics device;
    ArrayList<Shape> shapes = new ArrayList<Shape>();
    /**
     Construct a Frame with the specified width and height.
     @param width - the width in pixels.
     @param height - the height in pixels.
   */
    Frame(int width, int height) {
        device = new ConsoleGraphics(width, height);
	//        device = new SwingGraphics(width, height);
    }
    /**
       Add a shape to this frame.
       @param shape - the shape to add.
     */
    void add(Shape shape) {
        shapes.add(shape);
    }
    /**
       Remove a shape from this frame.
       @param shape - the shape to remove.
       @returns true if the shape was in the frame, false o/w.
     */
    boolean remove(Shape shape) {
        return shapes.remove(shape);
    }
    /**
       Remove all shapes from this frame.
    */
    void clear() {
        shapes.clear();
    }
    /**
       Cause this frame to be displayed.
     */
    void show() {
        for (Shape shape : shapes) {
            shape.draw(device);
        }
        device.render();
    }
}