Matan & Ron's Paint

Painter Application, C++ Object Oriented Programming, HIT

✨Ron Hugi ✨ ✨Matan Roginsky✨

Features

• Create Rectangle
• Create Line
• Create Ellipse
• Create Rhombus
• Create Square
• Clear paint area
• Delete a shape
• Move a shape
• Create shapes with different colors
• Craete shapes with different border line width and color
• Save paint into file
• Load paint from file
• Icons as buttons
• Painting area boundaries

The word polymorphism means having many forms. In simple words, we can define polymorphism as the ability of a message to be displayed in more than one form. A real-life example of polymorphism, a person at the same time can have different characteristics. Like a man at the same time is a father, a husband, an employee. So the same person posses different behavior in different situations. This is called polymorphism. Polymorphism is considered as one of the important features of Object Oriented Programming.

Classes

Matan & Ron's Paint uses a number of classes based on the polymorphism principals :

• FigureF - The parent class, Creates CDC object with virtual functions.
• LineF - Inherits from Figure, Creates CDC object.
• RectangleF - Inherits from Figure and Creates CDC object.
• EllipseF - Inherits from Figure, Creates CDC object.
• SquareF - Inherits from RectangleF.
• RhombusF - Inherits from RectangleF.

MFCprojectDlg.cpp - Main Functions

This file is the worker where all the buttons and wotking functions will be executed. The following is the functions written inside MFCprojectDlg.cpp:

OnPaint

Creates CpaintDC type variable to device context for painting. Generally, this function responsible for the activities inside the dialog, for example:

• Draw - Const Virtual function created inside Figure.h, in order to use the CDC object.

  if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc()), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CPaintDC dc(this); // Draw paint area dc.Rectangle(paintArea); for (int i = 0; i < figs.GetSize(); i++) { figs[i]->Draw(dc); } CDialogEx::OnPaint(); }

Important Functions

MFC contains multiple functions we used in order to create the objects and the painting abillity.

Functions	Description
OnLButtonDown	An event rised when the cursor click on the screen
OnLButtonUp	An event rised when the cursor release the click on the screen
OnMouseMove	An event rised when the cursor moves on the screen
OnPaint	An event rised when 'InvalidateRect' happand and paint the shapes on the paint area
InvalidateRect	Upadetes the screen and calls OnPaint
Draw	Each shape implements it's own draw function
MoveTo	Move a shape that is selected across the screen
Redefine	Used to draw the figure on the screen or in order to move the figure
IsInside	Used to check whether the user clicked on a figure

MFC Important Classes

MFC contains multiple classes we used in order to create the objects and the painting abillity.

Class	Description
CDC	This object allows the user the draw options, the connection to the worker tools and buttons, graphic devices etc.
CArchive	Part of the Serialization options, allows to store figures and rewrite them. Used as temporary memory.
CPoint	Stores the point values (X,Y) on screen.
CpaintDc	Prepares the application window for painting.
CRect	Defines the painting area.