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46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
Screen Control Functions for C02
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This module contains functions for screen and cursor manipulation.
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The accompanying assembly code vary by platform, so when invoking the
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cross-compilers, the command line option -s must be used to ensure that
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the correct header files are included.
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At the beginning of the program use the directives
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#include <screen.h02>
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The following functions should be defined:
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clrscn(); Clears the screen and returns the cursor to the home
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position.
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Returns with no action if the platform does not
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support the clear screen action.
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crsrhm(); Moves cursor to home position (upper left corner
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of the screen).
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Returns with no action if the platform does not
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support cursor positioning.
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setpos(c,r); Moves cursor to column c on row r. The topmost row
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and leftmost column are numbered 0.
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Returns with no action if the platform does not
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support cursor positioning.
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c,r = getpos(); Returns the current row and column of the cursor. The
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topmost row and leftmost column are numbered 0.
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Note: Returns 255 for both the width and height if
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the platform does not support cursor positioning.
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w,h = getsiz (); Returns the current screen or window width and height
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in rows and columns.
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Note: Returns 255 for width and/or height if either or
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both are cannot be determined via software. Since all
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supported platforms have less than 128 screen rows and
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columns, the :- test can be used on these values.
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