
gotoxy: positions cursor in  text window
clreol: clears to end of line in text window
clrscr: clears text mode window
wherex: gives horizontal cursor position within the current text  window
wherey: gives vertical cursor position within the current text  window

puttext: copies text from memory to screen
gettext: copies text from text-mode screen to memory
textcolor: selects new character color in text mode
textbackground :selects new text background color
================

bar:   draws a bar
getx:  returns the current position's x coordinate. The value is
      viewport-relative.
getmaxx: returns maximum x screen coordinate
gety:  returns the current position's y coordinate. The value is
      viewport-relative.

getmaxy: returns maximum y screen coordinate

line: draws a line from (x1,y1) to (x2,y2) using the current color,
      line style and thickness
linerel: draws a line a relative distance from the current positon.
	Uses the current color,  line style and thickness
lineto:   draws the line from the current position to (x,y)

outtext: displays the string in the viewport.
outtextxy: sends a srting to the specified location.


rectangle: draws a rectangle. Uses the current color,  line style and thickness
setlinestyle: sets the current line style and width or pattern.

setviewport: sets the current vieport for  graphics output.
textheight: returns the height of a string, in pixels.
textwidth:  returns the width of a string, in pixels.
