Visual Studio provides us with a few Wizards—tools that help usgenerate code. The Application Wizard creates an application framework(a skeleton application) to which we add the specific logic and behaviorof our application.

When developing a Windows application, the Document/View model comes in handy. The application is divided into a document object that holds the data and performs the logic, and one or more views that take care of user input and display information on the screen.

When an event occurs (the user clicks the mouse, the window is resized) a message is sent to the application, it is caught by a view object and is passed on to the document object. There are hundreds of messages in the Windows system. However, we only catch those that interest us.

The device context can be viewed both as a canvas...