7 An Example

▼ |  | Graphics: Legacy Library

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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