• Q – QUIT The application ends.

• D – DRAW A line is drawn from the PGPLOT "current position" to the cursor position. This position is also written to the internal label list.

• E – EXPAND The plotting limits are expanded by a factor of 2 about the position of the cursor. No other action is taken. This allows the screen to be cleared and the graph to be re-plotted without having to set the limits explicitly.

• G – GRADIENT Draw a line between two consecutive cursor hits and report the gradient of the line.

• L – LABEL Write a label directly onto the plot. The application uses up to two points which define the angle at which the label is to be drawn. Once "L" has been pressed, you are given the option to add another point in the standard PGPLOT fashion (c.f. the PGPLOT routine PGNCURSE); i.e. :

  • A – add a point

  • D – delete a point

  • X – finish

  On pressing the "X" key, a label is prompted for. If only one point is supplied, the label is plotted horizontally.

• M – MARK Mark the current cursor position with the current symbol type.

• O – ANNOTATE The label for the nearest data point is written with its right hand end at the position defined by the cursor. The information to create this label is stored in an internal table. This information can be written out into file suitable for including in an ICL command file by using the WRITEI application, e.g. :

  PONGO$>$ WRITEI LABLST

• P – ANNOTATE The label for the nearest data point is written with its left hand end at the position defined by the cursor. The information to create this label is stored in an internal table. This information can be written out into file suitable for including in an ICL command file by using the WRITEI application, e.g. :

  PONGO$>$ WRITEI LABLST

• S – SHRINK The plotting limits are set so as to zoom out by a factor of 2 about the position of the cursor. No other action is taken. This allows the screen to be cleared and the graph to be re-plotted without having to set the limits explicitly.

• V – MOVE The PGPLOT "current position" will be set to the cursor position. This position is also written to the internal label list.

• X – POSITION The current position of the cursor in world coordinates is written to the terminal and the XCURSE and YCURSE parameters.

• Z – ZOOM The limits for a zoomed version of the current plot are set. The application will prompt for two points which define the bottom left corner and the top right corner of the new graph surface.

  • A – add a point

  • D – delete a point

  • X – finish

SYMBOL = _INTEGER (Read)

LABEL = _CHAR (Read)

JUSTIFICATION = _REAL (Read and Write)

XCURSE = _REAL (Write)

YCURSE = _REAL (Write)

XMIN = _REAL (Write)

XMAX = _REAL (Write)

YMIN = _REAL (Write)

YMAX = _REAL (Write)

PROJECTION = _CHAR (Read)

RACENTRE = _CHAR (Read)

DECCENTRE = _CHAR (Read)