Page 237 - DCAP408_WEB_PROGRAMMING

Unit 14: Text and Graphics Output

{ Notes
// Translate the message and dispatch it to WindowProc()
TranslateMessage(&msg);
DispatchMessage(&msg);
}
// If the message is WM_QUIT, exit the while loop
if(msg.message == WM_QUIT)
break;
// Run game code here
// ...
// ...
}

Now our program can handle things as timely as we please, without having to worry about
Windows and its tedious messages.

Self Assessment

Fill in the blanks:
14. We use ......................... to create a loop that handled all the Windows message sent.
15. ......................... looks into the message queue and checks to see if any messages are waiting.

14.10 Summary

 In character mode, the display screen is treated as an array of blocks, each of which can
hold one ASCII character.
 In graphics mode, the display screen is treated as an array of pixels, with characters and
other shapes formed by turning on combinations of pixels.
 A device context is a Windows data structure containing information about the drawing
attributes of a device such as a display or a printer.

 The WM_PAINT message is sent when the system or another application makes a request
to paint a portion of an application’s window.

 Graphics is a very important part of visual basic programming as an attractive interface
will be appealing to the users.
 To draw a straight line, just click on the line control and then use your mouse to draw the
line on the form.
 Similarly, to draw a shape, just click on the shape control and draw the shape on the form.
 An animated GIF (Graphics Interchange Format) file is defined as a graphic image on a
Web page that moves.
 We use GetMessage() to create a loop that handled all the Windows message sent.
 PeekMessage() looks into the message queue and checks to see if any messages are waiting.

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