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XSCROLL & YSCROLL
(see Chapter 14(
the virtual screen, in user coordinates.
XUSABLE & YUSABLE
(see Chapter 9)
Use XUSABLE and YUSABLE are functions which return the usabte size of a graphics
XVIRTUAL & YVIRTUAL
(see Chapter 9)
Use XVIRTUAL and YVIRTUAL are functions which return the size of a graphics virtual
XWINDOW & YWINDOW
(see Chapter
14)
Use XWINDOW and YWINDUW arefunctions which return the size of a window, in screen
YASPECT
(see Chapters 9 & 12)
Use YASPECT is a function which gives the aspect ratio of a user coordinate pixel.
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