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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.