This is the repository for the homework 1 of the course Design Pattern opened during the 2020 Spring Semester at the National Taipei University of Technology.

You will have to program a simple geometry application called geo that sorts shapes, whose SRS is specified below. Specifically, you must write the implementations and tests for the classes and their methods given in this template project (only accessible to Gmail accounts of domain ntut.org.tw).

• As a command line application, geo reads shapes from an input file, sorting the shapes by area or perimeter in increasing or decreasing order, and writes the result to an output file.
• A shape's toString() method returns a string describing the shape itself. The string format is given here.
• The class InputOutput is responsible the program logic and must be called by the main function inside the class Geo (the application entry point).
• Vectors used to create a ConvexPolygon need to be sorted in either clockwise or counterclockwise direction. ConvexPolygon(s) whose vectors are not correctly sorted are invalid.
• The program must throw exception should a shape given in the input file is invalid. The program must also handle these exceptions by simply ignoring them.
• The parameters of the application's command line argument are defined as follow:
  • The first parameter is the path of the input file, which contains the shapes information.
  • The second parameter is the path of the output file, which will contain the sorted shapes information.
  • The third parameter is the condition to sort the shapes.
    • area to sort the shapes by their areas.
    • perimeter to sort the shapes by their perimeters.
  • The last parameter is the order to sort the shapes (by the condition given in the previous parameter).
    • inc to sort the shapes in increasing order.
    • dec to sort the shape in decreasing order.

The program can be executed using the following command:

mvn exec:java -Dexec.mainClass="org.ntutssl.shapes.Geo" -Dexec.args="test_data/input.txt test_data/output.txt area inc"

• phogbinh

• Yu Chin Cheng Professor's Blog on How to Solve Convex Polygon with C++