Programming Project 3 Solution

$35.00

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.

  1. 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.

  1. An instance method named getSolid that returns whether the shape is solid or hollow.

  1. A class method named getNoOfShapes that returns the number of shapes created so far.

  1. 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.

  1. 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.

  1. 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.

  1. An overridden getPreferredSize method that specifies the dimensions of the drawing panel as 200 pixels wide and 200 pixels high.

  1. 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 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.

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


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