Primer on Computer Graphics Programming. Revision (1982)
Defense Technical Information Center · leaf 36
VIRTUAL OR IMAGINARY SPACE — — ^ r - USER SPECIFIED VIRTUAL WINDOW- THESE PEN MOVEMENTS, IF WITHIN THE A USER'S CALL TO PEN MOVEMENTS ARE WITH VIRTUAL WINDOW OF THE FIRST DIAGRAM, RESPECT TO THE USER SPECIFIED VIRTUAL WILL ACTUALLY APPEAR WITHIN THE USER WINDOW. SPECIFIED DEVICE WINDOW OF THE ABOVE… … THIS ACTUALLY OCCURS AS THE RESULT OF A MAPPING DIRECTLY FROM THE VIRTUAL WINDOW TO THE DEVICE WINDOW. WILL ACTUALLY APPEAR WITHIN FOR EXAMPLE, THOSE PEN MOVEMENTS WHICH THIS PARTICULAR DEVICE WINDOW. FALL WITHIN THIS PARTICULAR VIRTUAL WINDOW . Figure 3-1. The Viewporting Concept 0791-1 iii-5
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