Texas Instruments TI-89 Titanium User Manual page 618

Drawing a Point or Pixel
Command Description
PtChg or Toggles (inverts) a pixel at the specified coordinates.
PxlChg PtChg, which uses point coordinates, affects the pixel
closest to the specified point. If the pixel is off, it is turned
on. If the pixel is on, it is turned off.
PtOff or Turns off (erases) a pixel at the specified coordinates.
PxlOff PtOff, which uses point coordinates, affects the pixel
closest to the specified point.
PtOn or Turns on (displays) a pixel at the specified coordinates.
PxlOn PtOn, which uses point coordinates, affects the pixel
closest to the specified point.
PtTest or Returns true or false to indicate if the specified coordinate
PxlTest is on or off, respectively.
PtText or Displays a character string at the specified coordinates.
PxlText
Drawing Lines and Circles
Command Description
Circle or Draws, erases, or inverts a circle with a specified center
PxlCrcl and radius.
DrawSlp Draws a line with a specified slope through a specified
point.
Line or Draws, erases, or inverts a line between two sets of
PxlLine coordinates.
Programming 615