Lab 26

Bunch of Lines

 

Objective:

 

Write a bunch of classes that will draw a bunch of lines!  Don’t worry you don’t have to write any graphics, as that part is provided in the driver.  Each line is drawn based on a math function that takes in a given x coordinate and will return its y coordinate.

• First download the driver and put it in your project
• DO NOT ALTER THE DRIVER!

 

Write an interface called Line

• Create the following method definition
• getYPoint: This takes in a decimal value and returns a decimal value depending on the type of line.

 

Write a class called SlopedLine

• This should implement Line
• Instance variable
• slope: a decimal value corresponding to the line’s slope
• Create the following Constructors
• Default
• Parameterized Constructor
• Accessors and Mutators for each variable
• Create the following Methods
• getYPoint – this method takes in a decimal value corresponding to a x-coordinate and returns the y-coordinate based on the slope equation (y = slope*x)

 

Write a class called ExponentialLine

• This should implement Line
• Instance variable
• exponent: a decimal value corresponding to the line’s exponent
• Create the following Constructors
• Default
• Parameterized Constructor
• Accessors and Mutators for each variable
• Create the following Methods
• getYPoint – this method takes in a decimal value corresponding to a x-coordinate and returns the y-coordinate based on the slope equation (y = x^exponent)

 

 

Write a class called SineLine

• This should implement Line
• Instance variable
• amplitude: a decimal value corresponding to the line’s amplitude
• frequency: a decimal value corresponding to the line’s frequency
• Create the following Constructors
• Default
• Parameterized Constructor
• Accessors and Mutators for each variable
• Create the following Methods
• getYPoint – this method takes in a decimal value corresponding to a x-coordinate and returns the y-coordinate based on a sine wave equation (y = amplitude*sin(x*frequency))

 

 

Write a class called SawLine

• This should implement Line
• Instance variable
• modValue: a decimal value corresponding to the modulo peak of the wave
• Create the following Constructors
• Default
• Parameterized Constructor
• Accessors and Mutators for each variable
• Create the following Methods
• getYPoint – this method takes in a decimal value corresponding to a x-coordinate and returns the y-coordinate based on the equation (y = x mod modValue)

 

Write a class called StaircaseLine

• This should implement Line
• Instance variable
• width: a decimal value corresponding to the stair’s width
• height: a decimal value corresponding to the stair’s height
• Create the following Constructors
• Default
• Parameterized Constructor
• Accessors and Mutators for each variable
• Create the following Methods
• getYPoint – this method takes in a decimal value corresponding to a x-coordinate and returns the y-coordinate based the width and height. HINT(using integer division and multiplying that by the height will achieve the effect).

 

HINT: If the lines are looking weird it may be a good idea to print out each of the coordinates and observing what is going on in the method getYPoint

 

 

Example Dialog:

Lab Report Questions

1. Draw a UML class diagram for this project
2. Describe polymorphism

Finally:

Upload the files to the dropbox