Description
1 The PixelList Class
Lab 9 developed the class Pixel that models a RGB pixel. For this lab assignment, you will design and
implement a class named PixelList that stores a dynamic list of Pixel objects. The class must have the
following constructors, member functions, and overloads.
1.1 Constructors
Implement (at least) the following constructors. Other constructors may be necessary.
• Null constructor – Empty list
• Copy constructor – Makes a deep copy of a PixelList
• Pixel constructor – Create an PixelList from a Pixel.
1.2 Destructor
Properly delete the pixel list.
1.3 Size of the List
The member function size() must return the number of pixels in the list.
1.4 Appending Elements
Implement append(Pixel pixel) method that will append a new Pixel (with value pixel) to the end of
the list. For example, the following code segment would create the list {[8, 8, 8], [18, 18, 18]}
1 PixelList pList ; // / < null constructor
2 pList . append ( Pixel (8 , 8 , 8));
3 pList . append ( Pixel (18 , 18 , 18));
1.5 Assignment Operator
Make a deep copy of the righthand-side PixelList (or Pixel) and assign it to the lefthand-side PixelList.
1.6 + Operator
Addition of the PixelList can occur with the following data types. All operations must be symmetric
and always return a PixelList.
• PixelList – Add corresponding Pixel elements. If one PixelList has fewer elements than the other,
assume the missing elements are zero. For example if the PixelList object a stores {[1, 1, 1], [2,
2, 2]} and the PixelList object b stores {[10, 10, 10], [20, 20, 20], [30, 30, 30]}, then
the operation a + b results in {[11, 11, 11], [22, 22, 22], [30, 30, 30]}.
• Pixel – As described in the previous operation, adds a Pixel value to the first pixel in the list.
1.7 Logical Operators
Logical operators must be able to compare a PixelList with another PixelList or a Pixel. All operations
must be symmetric.
• operator== – Return true if all the corresponding Pixel objects in the lists are equivalent.
• operator!= – Return true if any of the corresponding Pixel objects in the lists are not equivalent.
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Spring 2015
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1.8 Output
The insertion operator << should print out the elements in the list in the following manner. Assume a is an
PixelList with values {[1, 2, 3], [10, 20, 30]}. If a is printed to the screen
1 cout << a << ’\n ’;
the output must look like
{[1, 2, 3], [10, 20, 30]}
2 Programming Points
You must adhere to all of the following points to receive credit for this program.
1. Turn-in (print-outs and electronically) the files for this program.
2. You must submit the following 7 files (use the names listed below).
• PixelList must be broken into 3 files
– pixellist.h Contains the PixelList class definition.
– pixellist1.cpp Contains half of the PixelList member definitions.
– pixellist2.cpp Contains remaining half of the PixelList member definitions.
• pixel.h and pixel.cpp Since the PixelList class uses the Pixel class, include your Pixel class
files from lab 9 (be certain Pixel works correctly).
• driver.cpp A driver program that tests the PixelList class.
• makefile A makefile to compile the driver program. Note, the makefile must also compile the
necessary Pixel class files and have a make clean option.
3. All arrays must be dynamically allocated with no wasted space! Therefore, all arrays must be
dynamically sized to store only the information required. Be certain no memory leaks occur.
4. Perform appropriate error checking.
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Spring 2015
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