600.108 Intro Programming Lab                                Week 7
 
PROBLEM: Picture This

For lab this week you will use incremental coding to write a class
that can be used to create and manipulate digital pictures.  We will
build on this class in future labs to actually do something, but for
now we are just creating a class of the basics.  Each picture object
will have a height and width measured by (integer) pixels, and a
subject matter description.  The following instance methods should be
available for Picture objects:

- Construct one from three parameters which give the width, height, and
	subject values.
- Construct one from a single String parameter in the form: Multiword
	Description [width,height], such as: "Sleeping Cat [120,230]".
	The [ , ] format for the size is required.
- Return a string representation of a picture, in the same format used above.

- Get the area of the picture, in square pixels.
- Say if the picture is in landscape mode (true if width >= height).
- Say if the picture is in portrait mode (true if height >= width).

- Get the perimeter of the picture, in inches (real #), based on the current
	class resolution value (see the paragraph below).
- Compare two pictures based on their perimeters.  This method should
	operate like the compareTo method in the String class.

In addition to the instance methods above, there should be a shared
class data member which keeps track of the resolution for all
pictures, measured as the number of pixels per inch (ppi).  This value
should be initialized to 64.  In other words, one square inch of a
picture would be represented with 64x64 pixels.  There should also be
a class method which can be used to set this resolution to a new
(integer) value.  (A higher number is for better resolution.)

The details of these methods (parameter types, return types and names)
should be made clear by the driver program we are giving you so that
you can test your class.  You can download it from
www.cs.jhu.edu/~joanne/cs108/week07.java

PHASE 1: Download the posted driver program.  Look at it to see how
the class you are going to write is used.  Write a skeleton of the
Picture class.  This should have only headers for each of the methods
described above.  Make sure that the names and parameter lists match
how the methods are called in the driver program.  Add dummy return
values for any method that is supposed to return a value, appropriate
to that value's data type (such as return 0 or return false or return
null).  Get the files to compile together without any errors.  (At
this point pg07.java should compile, but not produce correct results.)

PHASE 2: Add the data members for your class.  Fill in the code for
the first three methods listed above (constructors and toString).  Get
these to compile and run properly with the driver program.

PHASE 3: Add the code for the next 3 methods listed above (area and
modes).  Get these to compile and run properly with the driver
program.

PHASE 4: Add the resolution class (static) data member and the class
(static) method to change it.  Add the perimeter and compare methods.
Compile and run all.

PHASE 5: Add complete and correct javadoc comments for all your
methods.  You should now be done!  


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   MAKE SURE YOU DELETE YOUR FILES OFF THE LAB COMPUTER WHEN DONE!!!
             FAILURE TO DO SO IS AN ETHICS VIOLATION!  
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