Description
The third programming project involves writing a program that draws two types of shapes, ovals
and rectangles. This program consists of six classes. The first class is the Shape class, which is
an abstract class that extends the predefined Java class Rectangle. It should contain two
instance variables, the color of the shape and whether the shape is solid or hollow. It should also
contain a class (static) variable that keeps track of how many shapes have been created.. It should
have three instance methods, one class method and one abstract method:
1. A constructor that accepts three parameters for the purpose of initializing the
characteristics of the shape, a Rectangle object that defines the dimensions and position
of the shape, the color of the shape and whether the shape is solid or hollow. It should
also update the number of shapes created so far.
2. An instance method named setColor that accepts the Graphics object as a parameter
and sets the color for the next draw operation to the color of the current shape.
3. An instance method named getSolid that returns whether the shape is solid or hollow.
4. A class method named getNoOfShapes that returns the number of shapes created so far.
5. An abstract method named draw that accepts a Graphics object as a parameter.
The Shape class has two subclasses. The first is Oval. It should have the following two methods:
1. A constructor that accepts three parameters for the purpose of initializing the
characteristics of the shape, a Rectangle object that defines the dimensions and position
of the shape, the color of the shape and whether the shape is solid or hollow.
2. An overridden method draw that draws the Oval object on the Graphics object passed as
a parameter.
The second subclass is Rectangular. It should have the following two methods:
1. A constructor that accepts three parameters for the purpose of initializing the
characteristics of the shape, a Rectangle object that defines the dimensions and position
of the shape, the color of the shape and whether the shape is solid or hollow.
2. An overridden method draw that draws the Rectangular object on the Graphics object
passed as a parameter.
The fourth class is named Drawing, which should extend the predefined Java class JPanel. It has
one instance variable that contains the shape that is currently drawn.. It should have three
methods:
1. An overridden paintComponent method that draws the current shape on the Graphics
object that is passed to it as a parameter. It should also draw the number of shapes that
have been created thus far in the upper left corner.
2. An overridden getPreferredSize method that specifies the dimensions of the drawing
panel as 200 pixels wide and 200 pixels high.
3. An instance method named drawShape that is passed the current shape to be drawn. It
first checks whether the shape provided will completely fit within the panel. If not, it
throws an OutsideBounds exception. Otherwise, it saves the shape in the corresponding
instance variable. It then calls repaint to cause that shape to be drawn.
No additional public methods should be included in any of the above classes.
The fifth class named OutsideBounds should define a checked exception.
The sixth class named Project3 should contain the main method. It should generate the GUI
shown below:
The combo-box for the shape type should allow two choices, either Rectangle or Oval. The
combo-box for the fill type should also allow two choices, either Hollow or Solid. The combobox for the color should allow seven choices, Black, Red, Orange, Yellow, Green, Blue or
Magenta.
Clicking the Draw button should first check whether any non integer values have been entered in
any of the fields that require integers. If so, an error message should be displayed in a
JOptionPane window. Otherwise an appropriate Shape object should be created and passed to
the drawShape method of the Drawing class. If that call results in an OutsideBounds exception
being thrown, an appropriate error message should be displayed in a JOptionPane window.
Be sure to follow good programming style, which means making all instance variables private,
naming all constants and avoiding the duplication of code. Furthermore you must select enough
different kinds of shapes to completely test the program.
Grading Rubric:
The following grading rubric will be used to determine your grade:
Attribute Meets
Shape class 15 points
an abstract class that extends the predefined Java class
Rectangle. It should contain two instance variables, the
color of the shape and whether the shape is solid or hollow.
It should also contain a class (static) variable that keeps
track of how many shapes have been created.. It should have
three instance methods, one class method and one abstract
method:
1. A constructor that accepts three parameters for the
purpose of initializing the characteristics of the shape, a
Rectangle object that defines the dimensions and position of
the shape, the color of the shape and whether the shape is
solid or hollow. It should also update the number of shapes
created so far.
2. An instance method named setColor that accepts the
Graphics object as a parameter and sets the color for the
next draw operation to the color of the current shape.
3. An instance method named getSolid that returns whether
the shape is solid or hollow.
4. A class method named getNoOfShapes that returns the
number of shapes created so far.
5. An abstract method named draw that accepts a Graphics
object as a parameter.
Oval class 15 points
It should have the following two methods:
1. A constructor that accepts three parameters for the
purpose of initializing the characteristics of the shape, a
Rectangle object that defines the dimensions and position of
the shape, the color of the shape and whether the shape is
solid or hollow.
2. An overridden method draw that draws the Oval object on
the Graphics object passed as a parameter.
Rectangular Class 15 points
It should have the following two methods:
1. A constructor that accepts three parameters for the
purpose of initializing the characteristics of the shape, a
Rectangle object that defines the dimensions and position of
the shape, the color of the shape and whether the shape is
solid or hollow.
2. An overridden method draw that draws the Rectangular
object on the Graphics object passed as a parameter.
Drawing Class 15 points
should extend the predefined Java class JPanel. It has one
instance variable that contains the shape that is currently
drawn.. It should have three methods:
1. An overridden paintComponent method that draws the
current shape on the Graphics object that is passed to it as a
parameter. It should also draw the number of shapes that
have been created thus far in the upper left corner.
2. An overridden getPreferredSize method that specifies the
dimensions of the drawing panel as 200 pixels wide and 200
pixels high.
3. An instance method named drawShape that is passed the
current shape to be drawn. It first checks whether the shape
provided will completely fit within the panel. If not, it
throws an OutsideBounds exception. Otherwise, it saves the
shape in the corresponding instance variable. It then calls
repaint to cause that shape to be drawn.
OutsideBounds class 10 points
defines a checked exception
Project 3 class 15 points
should contain the main method. It should generate the GU.
The combo-box for the shape type should allow two
choices, either Rectangle or Oval. The combo-box for the
fill type should also allow two choices, either Hollow or
Solid. The combo-box for the color should allow seven
choices, Black, Red, Orange, Yellow, Green, Blue or
Magenta.
Clicking the Draw button should first check whether any
non integer values have been entered in any of the fields that
require integers. If so, an error message should be displayed
in a JOptionPane window. Otherwise an appropriate Shape
object should be created and passed to the drawShape
method of the Drawing class. If that call results in an
OutsideBounds exception being thrown, an appropriate error
message should be displayed in a JOptionPane window.
Documentation and style 15 points
Follow good programming style, which means making all
instance variables private, naming all constants and avoiding
the duplication of code.
Furthermore you must select enough different kinds of
shapes to completely test the program
