The AXIS procedure draws an axis of the specified type and scale at a given position. The new scale is saved for use by subsequent overplots if the SAVE keyword parameter is set. By default, AXIS draws an X axis. The XAXIS, YAXIS, and ZAXIS keywords can be used to select a specific axis type and position.
AXIS [, X [, Y [, Z]]] [, /SAVE] [, XAXIS={0 | 1} | YAXIS={0 | 1} | ZAXIS={0 | 1 | 2 | 3}] [, /XLOG] [, /YNOZERO] [, /YLOG]
Graphics Keywords: [, CHARSIZE=value] [, CHARTHICK=integer] [, COLOR=value] [, /DATA | , /DEVICE | , /NORMAL] [, FONT=integer] [, /NODATA] [, /NOERASE] [, SUBTITLE=string] [, /T3D] [, TICKLEN=value]
[, {X | Y | Z}CHARSIZE=value]
[, {X | Y | Z}GRIDSTYLE=integer{0 to 5}]
[, {X | Y | Z}MARGIN=[left, right]]
[, {X | Y | Z}MINOR=integer]
[, {X | Y | Z}RANGE=[min, max]]
[, {X | Y | Z}STYLE=value]
[, {X | Y | Z}THICK=value]
[, {X | Y | Z}TICKFORMAT=string]
[, {X | Y | Z}TICKINTERVAL= value]
[, {X | Y | Z}TICKLAYOUT=scalar]
[, {X | Y | Z}TICKLEN=value]
[, {X | Y | Z}TICKNAME=string_array]
[, {X | Y | Z}TICKS=integer]
[, {X | Y | Z}TICKUNITS=string]
[, {X | Y | Z}TICKV=array]
[, {X | Y | Z}TICK_GET=variable]
[, {X | Y | Z}TITLE=string]
[, ZVALUE=value{0 to 1}]
Scalars giving the starting coordinates of the new axis. If no coordinates are specified, the axis is drawn in its default position as given by the [XYZ]AXIS keyword. When drawing an X axis, the X coordinate is ignored, similarly the Y and Z arguments are ignored when drawing their respective axes (i.e., new axes will always point in the correct direction).
Set this keyword to indicate that the scaling to and from data coordinates established by the call to AXIS is to be saved in the appropriate axis system variable,
Set this keyword to draw an X axis. If the X argument is not present, setting XAXIS equal to 0 draws an axis under the plot window with the tick marks pointing up, and setting XAXIS equal to one draws an axis above the plot window with the tick marks pointing down. If the X argument is present, the X axis is positioned accordingly, and setting XAXIS equal to 0 or 1 causes the tick marks to point up or down, respectively.
Set this keyword to specify a logarithmic X axis
Set this keyword to draw a Y axis. If the Y argument is not present, setting YAXIS equal to 0 draws an axis on the left side of the plot window with the tick marks pointing right, and setting YAXIS equal to one draws an axis on the right side of the plot window with the tick marks pointing left. If the Y argument is present, the Y axis is positioned accordingly, and setting YAXIS equal to 0 or 1 causes the tick marks to point right or left, respectively.
| Note |
Set this keyword to specify a logarithmic Y axis.
Set this keyword to inhibit setting the minimum Y axis value to zero when the Y data are all positive and non-zero, and no explicit minimum Y value is specified (using YRANGE, or
Set this keyword to draw a Z axis. If the Z argument is not present, setting ZAXIS has the following meanings:
If the Z argument is present, the Z axis is positioned accordingly, and setting ZAXIS equal to 0 or 1 causes the tick marks to point left or right, respectively.
Note that AXIS uses the 3D plotting transformation stored in the system variable field
| Note |
See Graphics Keywords for the description of graphics and plotting keywords not listed above.
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AXIS, YTITLE ='Y-axis Title'
To use the YTITLE graphics keyword, you must specify the YAXIS keyword to AXIS:AXIS, YAXIS = 0, YTITLE ='Y-axis Title'
Because the AXIS procedure draws an X axis by default, it is not necessary to specify the XAXIS keyword in order to use the X* graphics keywords.
CHARSIZE, CHARTHICK, COLOR, DATA, DEVICE, FONT, NODATA, NOERASE, NORMAL, SUBTITLE, T3D, TICKLEN, [XYZ]CHARSIZE, [XYZ]GRIDSTYLE, [XYZ]MARGIN, [XYZ]MINOR, [XYZ]RANGE, [XYZ]STYLE, [XYZ]THICK, [XYZ]TICKFORMAT, [XYZ]TICKINTERVAL, [XYZ]TICKLAYOUT, [XYZ]TICKLEN, [XYZ]TICKNAME, [XYZ]TICKS, [XYZ]TICKUNITS, [XYZ]TICKV, [XYZ]TICK_GET, [XYZ]TITLE, ZVALUE.
The following example shows how the AXIS procedure can be used with normal or polar plots to draw axes through the origin, dividing the plot window into four quadrants:
; Make the plot, polar in this example, and suppress the X and Y ; axes using the XSTYLE and YSTYLE keywords: PLOT, /POLAR, XSTYLE=4, YSTYLE=4, TITLE='Polar Plot', r, theta ; Draw an X axis, through data Y coordinate of 0. Because the XAXIS ; keyword parameter has a value of 0, the tick marks point down: AXIS,0,0,XAX=0,/DATA ; Similarly, draw the Y axis through data X = 0. The tick marks ; point left: AXIS,0,0,0,YAX=0,/DATA
Introduced: Original