GWBASIC User's Manual

GW-BASIC User's Guide
Example 1:
If you type:
NEW: SCREEN 2
the screen uses the standard coordinate attributes:
(0, 0) (320, 0) (639, 0)
↓ y increases
(320, 100)
(0, 199) (320, 199) (639, 199)
Example 2:
If you type:
WINDOW (-1, -1)-(1, 1)
the screen uses the Cartesian coordinates:
(-1, 1) (0, 1) (1, 1)
↑ y increases
(0, 0)
↓ y decreases
(-1, -1) (0, -1) (1, -1)
Example 3:
If you type:
WINDOW SCREEN (-1, -1)-(1, 1)
the screen uses the non-inverted coordinate:
(-1, -1) (0, -1) (1, -1)
↑ y decreases
(0, 0)
↓ y increases
(-1, 1) (0, 1) (1, 1)
RUN, SCREEN, and WINDOW with no attributes disable any WINDOW definitions and return the
screen to its normal physical coordinates.
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