CHANGE - Change plotting attributes

Description:

Change the PGPLOT plotting attributes: e.g. line style, pen colour etc. Several of the attributes can be changed at the same time. Each of the parameters is remembered from the last invocation of CHANGE: after BEGPLOT has been run, a single invocation of CHANGE can be used to reset the plotting attributes to their values the last time PONGO was used.

Usage:

change

Parameters:

ANGLE = _REAL (Read)

The angle hatch lines make with horizontal, in degrees. Only used when FILLSTY is 3. [45.0]

COLOUR = _INTEGER (Read and Write)

The pen number (colour index) PGPLOT uses for plotting. The value should be between 0 and 255. Usually the first 16 pens are predefined to have the following colours:

• 0 - background,

• 1 - foreground (default),

• 2 - red,

• 3 - green,

• 4 - blue,

• 5 - cyan,

• 6 - magenta,

• 7 - yellow,

• 8 - red $+$ yellow (orange),

• 9 - green $+$ yellow,

• 10 - green $+$ cyan,

• 11 - blue $+$ cyan,

• 12 - blue $+$ magenta,

• 13 - red $+$ magenta,

• 14 - dark grey,

• 15 - light grey.

It is possible to change the colour representation of any of the pen colour indices using the PALETTE application.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1 (i.e. foreground). [1]

CHEIGHT = _REAL (Read and Write)

The character height scaling. This parameter scales the default character height and also alters the size of the tick marks and symbols that PGPLOT plots. The default character height in PGPLOT is about 1/40 of the viewport height.

[The value of the global parameter PONGO_CHEIGHT is used. If PONGO_CHEIGHT is not defined, the default value 1.0 is used.]

FONT = _INTEGER (Read)

The font used by PGPLOT. The styles for each font are as follows:

• 1 - single-stroke font (default),

• 2 - roman font,

• 3 - italic font,

• 4 - script font.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1 (i.e. single-stroke font). [1]

FILLSTY = _INTEGER (Read)

The fill style used by PGPLOT. The fill styles are as follows:

• 1 - solid fill,

• 2 - hollow fill,

• 3 - hatched,

• 4 - cross-hatched

If the value is not specified on the command line, the current value is used. The current value is initially set to 2 (i.e. hollow fill). [2]

LINESTY = _INTEGER (Read)

The line style used by PGPLOT. The line style may be one of the following:

• 1 - full line (default),

• 2 - dashed,

• 3 - dot-dash-dot-dash,

• 4 - dotted,

• 5 - dash-dot-dot-dot.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1 (i.e. full line). [1]

LINEWID = _INTEGER (Read)

The line width scaling. This parameter scales the default line width.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1. [1]

PHASE = _REAL (Read)

The fraction of SEPARATION that hatched lines are displaced. Modifying this between regions makes their separation more obvious. This is only used when FILLSTY is 3. [0]

SEPARATION = _REAL (Read)

The separation of hatched lines. The unit spacing is 1 percent of the smaller of the height or width of the view surface. Only used when FILLSTY is 3. [1]

TEXTBACK = _INTEGER (Read)

The pen number (colour index) of the background used when drawing text. If less than zero then a transparent background is used. Zero erases the plot under the text region. [-1]

Examples:

ICL$>$ CHANGE RESET

will reset the plotting attributes to their default values.