Wave Function Visualizer - Version 3

Overview

This program graphically displays basic trigonometric functions — sine, cosine, tangent, and cotangent — using the old graphics.h library in C++. It provides an interactive menu for selecting and plotting these functions, and allows users to plot custom points on the coordinate plane.

Features

• Plot sine, cosine, tangent, and cotangent waveforms.
• Interactive menu system for easy navigation.
• Custom point plotting with coordinate transformation.
• Basic graphical window scaling to full screen.
• Visual guide lines and sector grids for better readability.

How to Run

1. Ensure your system supports graphics.h (typically an older Windows environment with compatible IDE like Turbo C++ or configured MinGW).
2. Compile all source files together.
3. Run the executable.
4. Use the menu to select the desired function or option.
5. Follow on-screen prompts for input.

File Structure

• main.cpp — Entry point with main menu.
• wave.cpp/h — Contains implementations for plotting trigonometric functions.
• menu.cpp/h — Menu handling and submenus.
• ValX.in and ValY.in — Input files for coordinate transformations.

Known Issues and Limitations

• Uses old graphics.h library, which is outdated and hard to set up on modern systems. Not portable outside Windows or specific IDE setups.
• Contains magic numbers (e.g., -540) in calculations that lack clear explanation or scaling, making behavior inconsistent on different resolutions.
• Array indexing and input handling in functions like FuncPick is risky and can cause crashes if inputs are invalid or out of expected range.
• Heavy use of system("CLS") leads to flickering and is Windows-specific, breaking portability and making the UI less smooth.
• Input and timing depend on kbhit() and delay(), resulting in a primitive, blocking user experience without proper event handling.
• No error handling for file input (e.g., ValX.in, ValY.in), so missing or corrupted files will crash the program silently.
• No boundary checks on pixel plotting, risking drawing outside the window or undefined behavior.

Suggestions for Improvement

• Replace graphics.h with a modern, cross-platform graphics library (e.g., SFML, SDL).
• Add input validation and error handling, especially for file reads and user input.
• Refactor magic numbers into named constants or computed values based on window size.
• Improve user interface with non-blocking input handling and smoother redraws.
• Add comments and documentation to improve maintainability.