Rectangle Drawing Application

A simple MFC (Microsoft Foundation Classes) application for creating and managing rectangles by clicking two points.

Description

This is a Windows application built with MFC that allows users to create rectangles interactively by clicking two points on the screen. The application supports creating multiple rectangles and deleting them by right-clicking.

Features

• Create Rectangles: Click two points with the left mouse button to create a rectangle
  • First click sets the first corner point
  • Second click sets the opposite corner point and creates the rectangle
• Delete Rectangles: Right-click on a rectangle to delete it
• Multiple Rectangles: Support for up to 30 rectangles simultaneously
• OpenGL Support: OpenGL context is initialized (available for future enhancements)

Usage

1. Create a Rectangle:

   • Click the left mouse button at the first corner position
   • Click the left mouse button again at the opposite corner position
   • A rectangle will be drawn between these two points

2. Delete a Rectangle:

   • Right-click anywhere inside a rectangle
   • The rectangle will be removed from the screen

Requirements

• Microsoft Visual C++ (MFC)
• Windows operating system
• OpenGL libraries (for context initialization)

Project Structure

• GlmfcnView.cpp/h - View class handling drawing and mouse events
  • OnDraw() - Renders all rectangles
  • OnLButtonDown() - Handles rectangle creation
  • OnRButtonDown() - Handles rectangle deletion
• GlmfcnDoc.cpp/h - Document class storing rectangle data
  • rectangles[30] - Array storing up to 30 rectangles
  • rectanglesCount - Current number of rectangles
  • hasFirstPoint - Flag indicating if first point is set
  • firstPoint - Coordinates of the first click point
• Glmfcn.cpp/h - Main application class

Building

1. Open the project in Visual Studio
2. Build the solution (Build → Build Solution)
3. Run the application (Debug → Start Debugging or F5)

Technical Details

Rectangle Storage

• Rectangles are stored in a fixed-size array of CRect objects
• Maximum capacity: 30 rectangles
• Each rectangle is defined by two corner points

Drawing

• Uses GDI (Graphics Device Interface) for rendering
• Rectangles are drawn with system button face color brush
• Double buffering is not implemented for GDI drawing

OpenGL Context

• OpenGL context is initialized but not currently used for rendering
• Available for future 3D graphics enhancements

License

This project is part of a computer graphics course work.