Chapter 6

1. It is an architecture of interactive software, used mainly in games. At periodic intervals, the framework checks the status of input devices, modifies the model accordingly, and then invokes the draw routine. Its advantage is that it better corresponds to a situation in which input devices have continuous input, such as a key being pressed for some time, or screen output changing continuously, even if the user does nothing.
2. When input events are discrete, such as a mouse click on a button or text typed into a box, and when output happens only because of a user action.
3. Continuous simulation software, industrial machine monitoring software, or multimedia software.
4. To draw a shape, you call the draw_ex method of the current window. The first argument of that method describes the shape to draw; it may be an instance of the Triangle, Rectangle, or Circle type.
5. In the update function, you can check the state of any key of the keyboard. For example, the window.keyboard()[Key::Right...