Readme file for Text2 (text2.pas)
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Text2 is a development of Text1 and 
allows the user to begin to control 
the program. Clicking the left mouse 
button in the Text2 window causes 
the execution of the TDemoWin.WMLButtonDown 
procedure. This code 
clears the displayed window 
(CreateRectRgnIndirect & PaintRgn) before
changing the type of font 
(Family := (Family + 1) mod 4;) and calling 
ShowFont to display the new font in the window.

ShowFont is a new procedure, introduced 
to allow repeat drawings to 
the same window with differing parameters 
(in this case, fonts). Using 
Paint, as in text1, in actually inefficient. 
Future programs should all 
define a specific procedure, like ShowFont 
or DrawNow, which control 
all the drawing to the window. The
ShowFont procedure is available to 
other parts of the program and itself 
has access to data hidden in the 
rest of the program.