Keywords: gildas-prog

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# Subroutines

- gtchar
  Draws a character string.
- gtclal
  Clear alphanumeric screen. On Windows applications, transfer focus to the (current) graphic window, and raise in on top of others to display it.
- gtclear
  Erase the whole plot, all directory structures, destroy all associated windows, etc... An empty top directory is then re-created
- gtclos
  Close the current graphic device
- gtclpl
  Raise alphanumeric window, and returns focus to it.
- gtcurs
  Call the cursor
- gtdls
  Delete the last graphic segment
- gtdraw
  Draw a vector from current pen position to the specified point.
- gtedit
  Edit the current segment properties.
- gterflag, gterrgto, gterrtst
  Control error status of the library
- gtexist
  Controls the existence of a named sub-directory.
- gthard
  Create a hardcopy
- gtinit
  Initialize the GTVIRT drawing space and the GTVL language
- gtopen
  Open a graphic device
- gtpolyl
  Draw a set of lines.
- gtreloc
  Move current pen position to specified coordinates.
- gtsegm
  Open a new segment
- gtview
  Activate the drawing
- gtwhere
  Returns current pen position
- gtg_charlen
  Computes character string length
- gtg_charsiz
  Returns character size
- gtg_curs
  Returns cursor existence
- gtg_screen
  Returns clipping parameters
- gtg_open
  Returns device parameters
- gtstat
  Change GTVIRT mode (Sleep or Wake_up), and returns previous mode.
- gtv_newimage
  Create a new image slot
- gtv_image
  Draw a bitmap to an image slot
- gtv_numimage
  Get a free image slot
- gtv_majimage
  Define parameters of an image slot
- gtv_fillpoly
  Fill a closed polygon.
- init_gtvirt
  Initialize the GTVIRT library
- exit_clear
  Quick exit, to be used at program completion.
- run_gtvl
  Dispatch the GTVL commands to appropriate subroutines
- exec_gtvl
  Execute a GTVL language command or command procedure

Immediate routines are used to produce immediate actions. They use the immediate pen. These subroutines are

- gti_beep: beep
- gti_clear: clear the current window
- gti_draw: draw line to current
- gti_out: flush the normal drawing buffer.
- gti_pen: select the immediate pen
- gti_polyl: draw a polyline
- gti_reloc: relocate the immediate pen
- gti_where: returns immediate pen position

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