Radio Shack TRS-80 Operation Manual page 78

Computer Graphics Operation Manual
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Sample Program (see CIRCLE)
LINE
Draws Line
LINE draws a line between the previous and current
coordinates. These coordinates are set by the SETXY or
SETXYR subroutines.
Example
CALL LINE
( l ,
-1)
Sample Program
This example draws a diagonal line connected to a box, which
is connected to a filled box.
SAMPLE FOR LINE LINEB LINEBF
LOGICAL COLOR
COLOR=1
CALL GRPINI(~)
CALL CLS
CALL SETXY(l,l)
CALL
SETXY(21~,8~)
CALL LINE(COLOR,-l)
CALL SETXY(42~,16~)
COORDINATES ARE NOW
(21~,8~) (42~,16~)
CALL LINEB(COLOR,-l)
CALL SETXY(639,239)
COORDINATES ARE NOW
(42~,16~)
(639,239)
CALL LINEBF(COLOR)
END
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