Interactive Graphing Calculator

A Final Project in C++

Class Name: CS 003A (FUNDAMENTALS OF COMPUTER SCIENCE II (C++))

Institution: Pasadena City College (Dual Enrollment)

Project Duration: April-May 2022

Project Description: Make a interactive function grapher with C++ and STL

My process

The architecture of my program was as follows:

• SFML (graphic interface) related classes

  • animate: Handles user interactions

  • system: Updates what the frames should look like after zoom/pan

  • graph: Plots a vector of Point objects

  • plot: Translates xy coordinates to coordinates of screen

• Equation-parsing classes (Actually generate the points)

  • shunting-yard: Parses equations in infix notation to postfix notation, puts each number/operand in a vector

  • RPN: Takes the equation from shunting-yard in postfix notation and computes the answer

So, when the user inputs an new equation or zooms/pans:

1. animate detects the desired interaction and tells system

2. system determines the new x y domain of the screen and tells graph this domain

3. graph asks plot to generate a list of points for the given function in the given domain

4. For every x in the x domain, the corresponding y is calculated for the user-inputted equation using shunting-yard and RPN

5. plot turns the (x,y) pairs into coordinates on the physical screen, passes it back up to graph

6. graph plots the physical screen coordinates

To load/save equations, the equations are saved to and read from a text file. But I forgot the specifics of how that works 🙃