Homework 3 - Inheritance and polymorphism

Reading: Chapter 7.

Due At 10pm, February 10, 2005. Late work will be accepted for 48 hours past the due date, with a one point penalty for each hour late.

Program Description - A Simple Drawing Package

For this assignment your are to implement a collection of classes that support a very simplified graphics system. Your system will be capable of drawing various shapes (rectangles, lines, and polygons). The shapes will be drawn on a particular "device" within a "frame". To test your classes, you will read specifications for the various shapes from System.in (e.g. using Console.in.readXXX(), or Scanner), and then create the appropriate frame or frames.

The classes you create must include:

GraphicsTest - the class containing main() and the test code.
Rectangle - for representing rectangles.
Line - for representing straight lines.
Polygon - for representing arbitrary polygons.
Frame - for representing a frame. Your Frame class must implment the interface TFrame. Furthermore, your Frame class should have no public methods other than those specified in TFrame plus constructors as needed.

The following are provided as part of this exercise. These classes are NOT TO BE MODIFIED in any way for this assignment.

Shape - an interface implemented by all shapes.
TGraphics - the interface implemented by a device you draw on.
ConsoleGraphics - an implementation of TGraphics for System.out. Your Frame class is the ONLY class that is allowed to mention this class by name.
Main - a simple test of how a Frame is expected to be used. Your Frame, Rectangle, and Line classes must work with this sample Main in addition to working with your program, GraphicsTest.

Your Rectangle, Line, Polygon, and Frame classes must also work with the SampleGraphicsTest which is available in /afs/cats/courses/cmps109-cm/java. This implies the following:

class Rectangle has a constructor that takes (left, top, width, height) all as integers
class Line has a constructor that takes (x1, y1, x2, y2) all as integers
class Polygon has a constructor that takes (maxPoints) as an integer
class Polygon has a method add(int x, int y) for adding points to a polygon up to the maximum number of points specified by the constructor
if you add more points to a polygon than specified by the maxPoints parameter of the constructor then the class can throw and exception

Input

Input will be a series of commands taken from the following list. The shapes are all given an integer id, to allow the shape to be modified or deleted.

f id width height - where id, width, and height are integers. Create a frame with the specified dimensions and the specified id. Make this the current frame. The first command input must be an F command. If a frame is created with a duplicate id, the new one replaces the old one. Your program can issue a warning, but it is not required to do so.
r id left top width height - where id, left, top, width, and height are integers. Draw a rectangle with the specified values on the current frame.
l id x1 y1 x2 y2 - where id, x1, y1, x1, and y2, are integers. Draw a line from (x1, y1) to (x2, y2) on the current frame. (Note the command is the lower case letter el not the digit one.
p id n x1 y1 x2 y2 ... xn yn - where id, n, xi, and yi are integers. n is the number of points in a polygon. The (xi, yi) are the points of the polygon to be drawn on the current frame. Draw lines from (x1, y1) to (x2, y2), from (x2, y2) to (x3, y3) etc, ending with a line from (xn, yn) back to (x1, y1).
d - display the current frame.
s id - make frame id, the current frame and display it. If there is no such frame, print an error message and leave the current frame unchanged.
c - clear the current frame, removing all displayed shapes.
x id - delete shape id from the current frame. If there is no such shape, print a warning and continue.
q - quit the program

For the commands r, l, and p, if there is already a shape with the specified id in the current frame, delete the old shape and replace it with the new shape and print a warning message that the shape was deleted.

All inputs values will be white space delimited. The main program is intended to be an interactive test program for your other classes, so some type of simple prompt would be appropriate.

In addition your program must support a command line arugment of -q for quiet mode. In quite mode, no prompt is printed. This is intended to be used for testing where input comes from a file (via file redirection) and output also goes to a file (via file redirection).

Output

Output is a series of frame displays, possibly with some intermixed error messages. There should be one frame display for each D and S command in the input.

Sample Input

f 1111 60 25
r 100 2 2 50 20
p 300 3 1 1 30 10 15 20
d
f 2222 70 40
r 100 3 2 50 20
l 200 12 2 50 20
d
s 1111
x 100
d

Sample Output

The following shows the input and output mixed as would be the case in interactive mode. If input was from a file using file redirection, the input commands would of course not be shown in the output.

enter command>f 1111 60 25
enter command>r 100 2 2 50 20
enter command>p 300 3 1 1 30 10 15 20
enter command>d
**************************************************************
*                                                            *
* **                                                         *
*  ****---------------------------------------------|        *
*  *   ****                                         |        *
*  |*      ***                                      |        *
*  | *        ***                                   |        *
*  |  *          ***                                |        *
*  |  *             ***                             |        *
*  |   *               ****                         |        *
*  |    *                  ***                      |        *
*  |     *                    **                    |        *
*  |     *                   **                     |        *
*  |      *                 *                       |        *
*  |       *              **                        |        *
*  |        *            *                          |        *
*  |        *          **                           |        *
*  |         *        *                             |        *
*  |          *     **                              |        *
*  |           *   *                                |        *
*  |           * **                                 |        *
*  |            *                                   |        *
*  |------------------------------------------------|        *
*                                                            *
*                                                            *
*                                                            *
**************************************************************
enter command>f 2222 70 40
enter command>r 100 3 2 50 20
enter command>l 200 12 2 50 20
enter command>d
************************************************************************
*                                                                      *
*                                                                      *
*   |--------**--------------------------------------|                 *
*   |          **                                    |                 *
*   |            **                                  |                 *
*   |              **                                |                 *
*   |                **                              |                 *
*   |                  **                            |                 *
*   |                    **                          |                 *
*   |                      **                        |                 *
*   |                        **                      |                 *
*   |                          ***                   |                 *
*   |                             **                 |                 *
*   |                               **               |                 *
*   |                                 **             |                 *
*   |                                   **           |                 *
*   |                                     **         |                 *
*   |                                       **       |                 *
*   |                                         **     |                 *
*   |                                           **   |                 *
*   |                                             ** |                 *
*   |------------------------------------------------|                 *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
************************************************************************
enter command>s 1111
**************************************************************
*                                                            *
* **                                                         *
*  ****---------------------------------------------|        *
*  *   ****                                         |        *
*  |*      ***                                      |        *
*  | *        ***                                   |        *
*  |  *          ***                                |        *
*  |  *             ***                             |        *
*  |   *               ****                         |        *
*  |    *                  ***                      |        *
*  |     *                    **                    |        *
*  |     *                   **                     |        *
*  |      *                 *                       |        *
*  |       *              **                        |        *
*  |        *            *                          |        *
*  |        *          **                           |        *
*  |         *        *                             |        *
*  |          *     **                              |        *
*  |           *   *                                |        *
*  |           * **                                 |        *
*  |            *                                   |        *
*  |------------------------------------------------|        *
*                                                            *
*                                                            *
*                                                            *
**************************************************************
enter command>x 100
enter command>d
**************************************************************
*                                                            *
* **                                                         *
*  ****                                                      *
*  *   ****                                                  *
*   *      ***                                               *
*    *        ***                                            *
*     *          ***                                         *
*     *             ***                                      *
*      *               ****                                  *
*       *                  ***                               *
*        *                    **                             *
*        *                   **                              *
*         *                 *                                *
*          *              **                                 *
*           *            *                                   *
*           *          **                                    *
*            *        *                                      *
*             *     **                                       *
*              *   *                                         *
*              * **                                          *
*               *                                            *
*                                                            *
*                                                            *
*                                                            *
*                                                            *
**************************************************************
enter command>

Sample Input2

The commands do not need to be one per line.

f 1111 60 25 r 100 3 2 10 20 l 200 2 2 50 20 p 300 3 1 1 30 10 15 20 d
f 2222 70 40 r 100 3 2 50 20 l 200 12 2 50 20 d s 1111 x 100 d

If the above was used via file redirection and quiet mode, the output would be as shown below.

**************************************************************
*                                                            *
* **                                                         *
*  ****------|                                               *
*  *|******  |                                               *
*   *  *** ***                                               *
*   |*    ***|***                                            *
*   | *      **  ***                                         *
*   | *      | ***  ***                                      *
*   |  *     |    ***  ****                                  *
*   |   *    |       **    ***                               *
*   |    *   |         ***    **                             *
*   |    *   |            *****                              *
*   |     *  |              ***                              *
*   |      * |            **   ***                           *
*   |       *|           *        ***                        *
*   |       *|         **            **                      *
*   |        *        *                ***                   *
*   |        |*     **                    ***                *
*   |        | *   *                         **              *
*   |        | * **                            ***           *
*   |        |  *                                 **         *
*   |--------|                                               *
*                                                            *
*                                                            *
*                                                            *
**************************************************************
************************************************************************
*                                                                      *
*                                                                      *
*   |--------**--------------------------------------|                 *
*   |          **                                    |                 *
*   |            **                                  |                 *
*   |              **                                |                 *
*   |                **                              |                 *
*   |                  **                            |                 *
*   |                    **                          |                 *
*   |                      **                        |                 *
*   |                        **                      |                 *
*   |                          ***                   |                 *
*   |                             **                 |                 *
*   |                               **               |                 *
*   |                                 **             |                 *
*   |                                   **           |                 *
*   |                                     **         |                 *
*   |                                       **       |                 *
*   |                                         **     |                 *
*   |                                           **   |                 *
*   |                                             ** |                 *
*   |------------------------------------------------|                 *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
*                                                                      *
************************************************************************
**************************************************************
*                                                            *
* **                                                         *
*  ****------|                                               *
*  *|******  |                                               *
*   *  *** ***                                               *
*   |*    ***|***                                            *
*   | *      **  ***                                         *
*   | *      | ***  ***                                      *
*   |  *     |    ***  ****                                  *
*   |   *    |       **    ***                               *
*   |    *   |         ***    **                             *
*   |    *   |            *****                              *
*   |     *  |              ***                              *
*   |      * |            **   ***                           *
*   |       *|           *        ***                        *
*   |       *|         **            **                      *
*   |        *        *                ***                   *
*   |        |*     **                    ***                *
*   |        | *   *                         **              *
*   |        | * **                            ***           *
*   |        |  *                                 **         *
*   |--------|                                               *
*                                                            *
*                                                            *
*                                                            *
**************************************************************
**************************************************************
*                                                            *
* **                                                         *
*  ****                                                      *
*  * ******                                                  *
*   *  *** ***                                               *
*    *    *** ***                                            *
*     *      **  ***                                         *
*     *        ***  ***                                      *
*      *          ***  ****                                  *
*       *            **    ***                               *
*        *             ***    **                             *
*        *                *****                              *
*         *                 ***                              *
*          *              **   ***                           *
*           *            *        ***                        *
*           *          **            **                      *
*            *        *                ***                   *
*             *     **                    ***                *
*              *   *                         **              *
*              * **                            ***           *
*               *                                 **         *
*                                                            *
*                                                            *
*                                                            *
*                                                            *
**************************************************************

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