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114 lines
4.8 KiB
Plaintext
114 lines
4.8 KiB
Plaintext
Screen Control Functions for C02
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This is a prototype definition for a library providing functions
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to manipulate the screen and move the cursor. Since this code is
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highly system dependent, a separate library will need to be
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created for each system type.
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The following functions should be defined:
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clrscn(); Clears the screen and returns the cursor to the
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home position.
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Note: May call a system routine, or may print
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"clear screen" character sequence.
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crsrhm(); Moves cursor to home position (upper left corner
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of the screen).
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Note: May call mvcrsr(0,0); or may print "cursor
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home" character sequence.
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crsrlf(); Moves cursor one column to the left. May or may not
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screen wrap, depending on system.
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Note: May call mvcrsr; or may print "cursor left"
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character sequence.
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crsrrt(); Moves cursor one column to the right. May or may not
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screen wrap, depending on system.
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Note: May call mvcrsr; or may print "cursor right"
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character sequence.
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crsrup(); Moves cursor one row up.
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Note: May call mvcrsr; or may print "cursor up"
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character sequence.
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crsrdn(); Moves cursor one row down.
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Note: May call mvcrsr; or may print "cursor down"
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character sequence.
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mvcrsr(r, c); Moves cursor to row r, column c.
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Note: May call system routine, or set system variables.
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h = scnhgt(); Returns screen height in rows.
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Note: May call system routine, or read system variable.
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w = scnwid(); Returns screen width in columns.
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Note: May call system routine, or read system variable.
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c = scncol(); Returns current screen column.
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Note: May call system routine, or read system variable.
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r = scnrow(); Returns current screen row.
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Note: May call system routine, or read system variable.
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txtclr(c); Sets text color to system color c.
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Note: May call system routine or may print color change
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sequence.
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bkgclr(c); Sets background color to system color c.
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Note: May call system routine or may print color change
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sequence.
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Assembly Constants (Defined in System Header file)
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BLACK Code for color Black
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BLUE Code for color Blue
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GREEN Code for color Green
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CYAN Code for color Cyan
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RED Code for color Red
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MAGNTA Code for color Magenta
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YELLOW Code for color Yellow
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WHITE Code for color White
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BREAK ASCII code for Break/Stop Key
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BCKSPC ASCII code for Backspace key
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CLEAR ASCII code for Clear Key
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DELETE ASCII code for Delete key
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DOWN ASCII code for Cursor Down Key
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ENTER ASCII code for Return/Enter key (usually CR)
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ESCAPE ASCII code for Escape/Abort key (usually ESC)
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FNx ASCII code for Function Key x
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HOME ASCII code for Home Key
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INSERT ASCII code for Insert Key
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LEFT ASCII code for Cursor Left Key
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RIGHT ASCII code for Cursor Left Key
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TAB ASCII code for Tab Key
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UP ASCII code for Cursor Up Key
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BTMLFT ASCII code for Box Drawing Bottom Left Corner
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BTMRGT ASCII code for Box Drawing Bottom Right Corner
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BTMTEE ASCII code for Box Drawing Bottom to Cetter Tee
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CTRCRS ASCII code for Box Drawing Center Cross
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HRZLIN ASCII code for Box Drawing Horizontal Line
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LFTTEE ASCII code for Box Drawing Left To Center T
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RGHTEE ASCII code for Box Drawing Right To Center T
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TOPLFT ASCII code for Box Drawing Top Left Corner
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TOPRGT ASCII code for Box Drawing Top Right Corner
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TOPTEE ASCII code for Box Drawing Top to Center T
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VRTLIN ASCII code for Box Drawing Verical Line
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