Description
Please see attached files for instructions and specifics of the assignment
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CMSC 330 Project 1
The first programming project involves extending the Java skeleton program that it is provided in
the attached .zip file. That skeleton program displays a scene of graphic images contained in a
scene definition file. The grammar for that scene definition file is shown below:
scene → SCENE IDENTIFIER number_list images END ‘.’
images → image images | image
image → right_triangle | rectangle
right_triangle →
RIGHT_TRIANGLE COLOR number_list AT number_list HEIGHT NUMBER WIDTH
NUMBER ‘;’
rectangle →
RECTANGLE_ COLOR number_list AT number_list HEIGHT NUMBER WIDTH
NUMBER ‘;’
number_list → ‘(‘ numbers ‘)’
numbers → NUMBER | NUMBER ‘,’ numbers
In the above grammar, terminal symbols are upper case names or character literals shown in blue
and nonterminal symbols are lower case names shown in red. EBNF metacharacters are shown in
black. Tokens can be separated by any number of spaces. Identifiers and keywords are strings of
alphabetic characters. Identifiers are case sensitive. Numbers are unsigned integers.
That program reads in the scene definition file that defines the image objects in a scene and
creates those objects, inserts them into the scene and displays that scene.
You are to modify the program so that it will parse and display the additional images defined by
the expanded grammar shown below with the additions to the grammar highlighted in yellow:
scene → SCENE IDENTIFIER number_list images END ‘.’
images → image images | image
image →
right_triangle | rectangle | parallelogram | regular_polygon | isosceles
| text
right_triangle →
RIGHT_TRIANGLE COLOR number_list AT number_list HEIGHT NUMBER WIDTH
NUMBER ‘;’
rectangle →
RECTANGLE_ COLOR number_list AT number_list HEIGHT NUMBER WIDTH
NUMBER ‘;’
parallelogram →
PARALLELOGRAM COLOR number_list AT number_list number_list OFFSET
NUMBER ‘;’
regular_polygon →
REGULAR_POLYGON COLOR number_list AT number_list SIDES NUMBER RADIUS
NUMBER ‘;’
isosceles →
ISOSCELES COLOR number_list AT number_list HEIGHT NUMBER WIDTH
NUMBER ‘;’
text →
TEXT COLOR number_list AT number_list STRING ‘;’
number_list → ‘(‘ numbers ‘)’
numbers → NUMBER | NUMBER ‘,’ numbers
The UML diagram for the whole project is shown below:
The classes shown in black are included in the skeleton project. You must complete the project
by writing those classes shown in red, modifying the Parser class so that it will parse the
expanded grammar, modifying the Lexer class to handle string tokens, and modifying the
Tokens enumerated type to add all the new tokens.. Below is a description of each of the five
classes that you must write:
The Text class must contain a constructor that is supplied the color that defines the text color, a
point that specifies the text location and a string containing the text to be displayed. It must also
contain a draw function because it is extends the abstract class Image. The draw function must
draw the text using the method drawString in Graphics class.
The SolidPolygon class must contain a constructor that is passed the number of vertices in the
polygon and its color. It must define the method drawPolygon because it is extends the abstract
class Polygon_. It should call the fillPolygon method of the Graphics class to draw a solid
polygon.
The IsoscelesTriangle class must have a constructor that is supplied the color of the triangle,
a point that specifies the location of the top vertex, and the height and width of the triangle. It
must allocate the arrays of x and y coordinates that defines the triangle and it must compute their
values.
The Parallelogram class must have a constructor that is supplied the color of the parallelogram,
two points that specifies the location of the upper left and lower right vertices in addition to
an x offset value that specifies the x distance between the upper and lower left vertices. It must
allocate the arrays of x and y coordinates that defines the parallelogram and it must compute their
values.
The RegularPolygon class must contain a constructor that is supplied the color of the polygon,
the number of sides, a point that specifies the location of its center, and the radius, which defines
the distance between the center and each of the vertices. It must allocate the arrays of x and y
coordinates that defines the regular polygon and it must compute their values.
Below is a sample of a scene definition file that would provide input to the program:
Scene Polygons (500, 500)
RightTriangle Color (255, 0, 0) at (50, 30) Height 100 Width 300;
Rectangle Color (0, 128, 255) at (100, 100) Height 200 Width 100;
Isosceles Color (255, 0, 0) at (120, 120) Height 100 Width 200;
Parallelogram Color (0, 0, 255) at (340, 50) (440, 120) Offset 30;
RegularPolygon Color(255, 0, 255) at (300, 300) Sides 6 Radius 80;
Text Color(0, 0, 0) at (400, 200) “Hello World”;
End.
Notice that the token names are all upper case and may contain underscores whereas the
corresponding lexemes at in title case without underscores. For example the token
RIGHT_TRIANGLE has lexeme RightTriangle. The lexical analyzer in the skeleton handles the
necessary conversion. Shown below is the scene that should be produced when the program is
provided with the above scene definition.
The deliverables for this project include the following:
1. A .zip file containing all the source code correctly implementing all required
functionality.
a. All the .java files provided in the skeleton should included regardless of whether
they required any changes
b. All new files must include a header with the student name, date, project and a
description of what the file contains
c. All modified files must include a header with the same information
2. A Word or PDF file that contains the following:
a. A discussion of how you approached the project
b. A test plan that contains test cases that include all additional images and test any
new functionality. For each test case, the output produced should be included.
c. A discussion of lessons learned from the project and any improvements that could
be made
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