7 An Example

1	Basic Commands
2	Position Operations
3	Color Operations
4	Draw, Clear, and Flip Operations
5	World Operations
6	Miscellaneous Operations
7	An Example
8	A More Complicated Example
9	Protecting Graphics Operations
10	Mouse Operations
11	Keyboard Operations
12	Flushing
13	Graphics Library as a Unit

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7 An Example

(open-graphics)
; nothing appears to happen, but the library is initialized...

(define w (open-viewport "practice" 300 300))
; viewport window appears

((draw-line w) (make-posn 30 30) (make-posn 100 100))
; line appears

(close-viewport w)
; viewport disappears

(close-graphics)
; again, nothing appears to happen, but
; unclosed viewports (if any) would disappear

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