Example Program and Statement Details
Overview
The LAYOUT
OVERLAY statement provides the XAXISOPTS=, YAXISOPTS=, X2AXISOPTS=,
Y2AXISOPTS= options that enable you to manage the axis display separately
for the X, Y, X2, and Y2 axes. The following example template uses
the YAXISOPTS= option to manage the grid lines, tick marks, and tick
values on a Y axis:
begingraph;
layout overlay /
yaxisopts=(
griddisplay=on
display=(ticks tickvalues)
);
seriesplot x=month y=predict;
endlayout;
endgraph;
Within
an OVERLAY layout block, each plot axis is always of a particular
type. In the default cases, the axis type is always DISCRETE, LINEAR,
or TIME. The TYPE= option enables you to specify an
axis type that overrides the default. For example, when appropriate
for the data, you can request a LOG axis. When you override the default
axis type, you must be sure to specify the correct axis type for the
plot(s) that you are defining.
Each axis
type has features specific to that type, and the following axis options
enable you to specify features for the different types: DISCRETEOPTS=, LINEAROPTS=, LOGOPTS= , and TIMEOPTS= . One or more of these options can
be specified for an axis, but the specified settings are applied only
to the axis type that supports them.
General Options for All Axes in an Overlay
The options
that are documented in this section can be used with any of the axis
types that are supported within an OVERLAY layout. Subsequent sections
in the chapter document the axis options that are available only for
specific axis types: discrete, linear, log, or time axes.
specifies one or more
options for a discrete X or X2 axis. See Options for Discrete X or X2 Axes Only.
controls which axis
features are displayed on the secondary axis. When data are mapped
to the X or Y axis but not to the X2 or Y2, you can display X2 or
Y2 (secondary) axis using this option. The secondary axis is a duplicate
of the X or Y axis (or X2 or Y2, if data are mapped only to X2 or
Y2) but can have different display options.
specifies the attributes
of the grid lines. See General Syntax for Attribute Options for the syntax
on using a style-element and Line Options for available line-options.
specifies whether axis
grid lines are displayed.
This option enables
the template to absolutely control the display of grid lines or to
allow interaction with the current style to decide whether grid lines
are displayed.
Supplied styles use
DisplayOpts="AUTO," which means that the style has no “preference”
about grid lines and the graphics template setting for grid lines
is always used.
Discussion: The following table shows the end results for various combinations
of the GRIDDISPLAY= option and the DisplayOpts= attribute of the GraphGridLines
style element. Most supplied templates use the default setting AUTO_OFF
to indicate a preference for not displaying grid lines, but allowing
the style to override.
specifies the axis
label. The string can be either
a string literal or a dynamic. The list form implies that all included
string literals or dynamics will be concatenated.
Default: The default label is derived from the primary plot in the layout.
For more information, see When Plots Share Data and a Common Axis.
Interaction: If the axis label is too long to fit along the axis, it is truncated
by default. Use the SHORTLABEL= option to specify an alternate axis
label to be used whenever truncation would normally occur.
specifies the color
and font attributes of the axis label. See General Syntax for Attribute Options for the syntax
on using a style-element and Text Options for available text-options.
specifies one or more linear-axis-options for a numeric interval axis.
See Options for Linear Axes Only.
specifies one or more log-axis-options for a log axis. See Options for Log Axes Only.
reserves an area at
the maximum end of the axis. No tick marks are displayed in the reserved
area. For more information, see Adjusting Axis Offsets.
reserves an area at
the minimum end of the axis. No tick marks are displayed in the reserved
area. For more information, see Adjusting Axis Offsets.
specifies an alternate
axis label. This label is used when the default axis label or label
specified by the LABEL= option is too long for the axis length.
specifies the color
and font attributes of the axis tick values. See General Syntax for Attribute Options for the syntax
on using a style-element and Text Options for available text-options.
specifies one or more time-axis-options for a time axis. See Options for Time Axes Only.
specifies the type
of axis to use.
Requests that the axis
type be automatically determined, based on the overlay contents. For
more information, see When Plots Share Data and a Common Axis.
Use a DISCRETE axis
if possible. The data for discrete axes can be character or numeric.
For an X or X2 axis, you can add a DISCRETEOPTS=( ) option list to customize this
axis type. DISCRETEOPTS= is not supported on a Y or Y2 axis.
Use a LINEAR axis if
possible. You can add a LINEAROPTS=( ) option list to customize this
axis type.
Use a TIME axis if
possible. Data for this axis must be SAS time, SAS date, or SAS datetime
values. You can add a TIMEOPTS= ( ) option list to customize this
axis type.
Use a LOG axis if possible.
You can add a LOGOPTS= ( ) option list to customize this
axis type.
Interaction: If this option is set to anything other than AUTO, plots within
the layout are dropped from the display if their data types or data
ranges do not match the axis type requirements. For more information,
see Plot Axis Types Must Agree on Common Axes.
Interaction: After the axis type is determined (whether you set a specific type
or AUTO is in effect), only options supported by that axis type can
be used. For example, if TYPE=TIME, only the general OVERLAY axis
options and those available on TIMEOPTS= are supported.
Options for Discrete X or X2 Axes Only
specifies one or more
options for a discrete X or X2 axis. This option is not available
for a Y or Y2 axis. Options must be enclosed in parentheses. Each
option is specified as a name = value pair and each pair is space separated.
The collision-avoidance
policy that is most effective depends on the number of tick values,
their length, and the length of the axis. The policy can be one of
the following:
| ROTATE | Tick values are rotated 45 degrees. |
| ROTATETHIN | Attempt ROTATE policy and then THIN policy. |
| STAGGER | Tick values alternate between two rows. |
| STAGGERROTATE | Attempt STAGGER policy and then ROTATE policy. |
| STAGGERTHIN | Attempt STAGGER policy and then THIN policy. |
| STAGGERTRUNCATE | Attempt STAGGER policy and then TRUNCATE policy. |
| TRUNCATE | Tick values are shortened when they exceed a certain number of characters. |
| TRUNCATEROTATE | Attempt TRUNCATE policy and then ROTATE policy. |
| TRUNCATESTAGGER | Attempt TRUNCATE policy and then STAGGER policy. |
| TRUNCATETHIN | Attempt TRUNCATE policy and then THIN policy. |
| THIN | Some tick values are removed. |
Options for Linear Axes Only
specifies that evenly
spaced integer values are used for tick marks.
Interaction: This option overrides the MAXDECIMALS= and PREFERREDDECIMALS= suboptions
of the TICKVALUEFORMAT= option
specifies that the
axis perpendicular to the current axis be drawn at the indicated data
value.
Interaction: If the specified value is outside the data range for the current
axis, the data range is extended to include the value.
The axis line, ticks,
and tick values of the “perpendicular” axis move to
the location indicated by the origin. The axis label is not moved.
Discussion: For managing origin settings, the GTL treats the X and Y axes as
a pair, and the X2 and Y2 axes as a separate pair. Thus, if you set
the Y-axis origin to 200, the X axis is drawn from that origin point.
If the graph also displays an X2 axis, it is unaffected and does not
move. Similarly, if you set an origin for the Y2 axis, the X2 axis
moves to that origin point and the X axis is unaffected.
If you set an origin
for the Y2 axis and there is no X2 axis, then the origin setting for
Y2 does not affect the graph display. That is, the X axis does not
move to that origin point.
If you set an origin
for an axis and the axis has a tick value at that origin value, the
tick value is not displayed. Suppressing the tick value at the origin
prevents the value from colliding with the axis value on the "perpendicular"
axis. However, it is possible that the tick values on the orthogonal
axes will collide.
specifies a bias for
including one more tick mark at the maximum end of the axis. For more
information, see Adjusting Axis Thresholds.
specifies a bias for
including one more tick mark at the minimum end of the axis. For more
information, see Adjusting Axis Thresholds.
specifies a policy
for avoiding tick value collision. Only the default setting (THIN)
is available for a Y or Y2 axis.
The collision-avoidance
policy that is most effective depends on the number of tick values,
their length, and the length of the axis. For an X or X2 axis, the
policy can be one of the following:
specifies how to format
the values for major tick marks.
specifies one or more
major tick value formatting options. Together, these options provide
parameters for determining an optimal format ( w.d, Ew., BESTw.) for displaying
major tick values.
| MAXWIDTH = integer | Specifies the maximum width for displayed tick values. Values might be rounded or converted to E-notation to fit into this width. |
| MAXDECIMALS = integer | Specifies the maximum number of decimals for displayed tick values. Values might be rounded or converted to E-notation to fit into this width. MAXWIDTH > MAXDECIMALS |
| PREFERREDDECIMALS = integer | Specifies the number of decimal places desired for most values. The actual number might vary based on other constraints. |
| EXTRACTSCALE = boolean | Specifies whether to extract some factor of ten from all tick values in order to reduce the overall width of the tick values and improve legibility. The extracted factor is concatenated to the existing axis label. Example of revised axis label: Number Sold (x1000) |
Restriction: The format-options are used
only when no format has been assigned to the variable(s) that contribute
to the axis or when the assigned format(s) are w.d, Ew. or BESTw.
Restriction: GTL currently honors most but not every SAS format. For details,
see SAS Formats Not Supported.
specifies the tick
values for a linear axis as list.
Default: An internal algorithm determines the tick marks based on the actual
axis data range or the data range established by the VIEWMIN= and VIEWMAX= options. By default when this option
is used, the only tick values that appear are the tick values in numeric-list that fall within the explicit data
range (set by VIEWMIN= and VIEWMAX=) or implicit data range (set by
the actual data minimum and data maximum).
Interaction: This option is ignored if the TICKVALUESEQUENCE= option is specified, or if the DISPLAY= option does not display tick values.
Interaction: The VIEWMIN= and VIEWMAX= options alter the axis data range.
If the VIEWMIN= option is set to the minimum tick list value and the
VIEWMAX= option is set to the maximum tick list value, all ticks in
the tick list are displayed.
Interaction: If the TICKVALUEPRIORITY= is set to TRUE, 1) the VIEWMIN= and
VIEWMAX= options are ignored if they are fully enclosed by the numeric-list 2) the tick numeric-list can extend the implicit data range of the axis, but never reduce
it.
The values in the
list are formatted according to the setting for the TICKVALUEFORMAT= option.
specifies whether an
axis tick specification (TICKVALUELIST= or TICKVALUESEQUENCE=) can
extend the axis data range.
Interaction: When this option is set to TRUE, the VIEWMIN= and VIEWMAX= options
are ignored if they are fully enclosed by value range set by the TICKVALUELIST= or TICKVALUESEQUENCE= option.
specifies the tick
values for a linear axis by start, end, and increment.
Default: An internal algorithm determines the tick marks based on the actual
axis data range or the data range established by the VIEWMIN= and VIEWMAX= options. By default when this option
is used, the only tick values that appear are those that fall within
the explicit data range (set by VIEWMIN= and VIEWMAX=) or implicit
data range (set by the actual data minimum and data maximum).
| START = number | Specifies the value for the first tick mark. |
| END = number | Specifies the value for the last tick mark. |
| INCREMENT = number | Specifies the increment for intermediate tick marks between the first and last tick marks. The END value always controls the last tick mark. The interval between the last tick mark and the previous tick mark might not necessarily be the INCREMENT value. |
Interaction: The VIEWMIN= and VIEWMAX= options alter the axis data range. If
the VIEWMIN= option is set to the START= option value and the VIEWMAX=
option is set to the END= option value, all ticks in the tick sequence
are displayed.
Interaction: If the TICKVALUEPRIORITY= option is set to TRUE, the tick sequence
might extend the explicit data range of the axis, but never reduce
it.
The values in the
sequence are formatted according to the setting for the TICKVALUEFORMAT= option.
specifies the maximum
data value to include in the display (the value might be adjusted
by the threshold calculation). For more information, see Adjusting the Axis View.
Interaction: This option does not determine the maximum axis tick value displayed.
The THRESHOLDMAX= value is used to determine the maximum
tick value.
specifies the minimum
data value to include in the display (the value might be adjusted
by the threshold calculation). For more information, see Adjusting the Axis View.
Interaction: This option does not determine the minimum axis tick value displayed.
The THRESHOLDMIN= value is used to determine the maximum
tick value.
Options for Log Axes Only
specifies whether minor
ticks are displayed:
Restriction: Minor ticks can be displayed only when BASE=10 and TICKINTERVALSTYLE= is LOGEXPAND or LOGEXPONENT.
specifies how to scale
and format the values for major tick marks.
A LOGEXPAND, LOGEXPONENT,
or LINEAR representation is chosen automatically based on the range
of the data. When the data range is small (within an order of magnitude),
a LINEAR representation is typically used. Data ranges that encompass
several orders of magnitude typically use the LOGEXPAND or LOGEXPONENT
representation.
Restriction: For LOGEXPONENT, formats on data columns contributing to the axis
are ignored. For LOGEXPAND, formats on data columns contributing to
the axis are ignored, although any "named format" on the column is
retained. For LINEAR, ticks values are automatically formatted when
the column format is not assigned or one of w.d, Ew. or BESTw. Other
formats (SAS defined or user-defined) are used if specified.
Restriction: GTL currently honors most but not every SAS format. For details,
see SAS Formats Not Supported.
specifies the maximum
data value to include in the display. For more information, see Adjusting the Axis View.
specifies the minimum
data value to include in the display. For more information, see Adjusting the Axis View.
Options for Time Axes Only
specifies one or more time-axis-options for a time axis.
Variables associated
with a time axis must be in SAS time, SAS date, or SAS datetime units
and have an associated SAS time, date, or datetime format.
specifies the time
interval between major ticks. Valid interval keywords are AUTO, SECOND, MINUTE, HOUR, DAY, TENDAY, WEEK, SEMIMONTH,
MONTH, QUARTER, SEMIYEAR, YEAR.
The data column(s)
mapped to a time axis must be in the same duration units: TIME, DATE,
or DATETIME. The selection of an interval must be consistent with
the duration unit. For example, if the data are in time units, you
can select only AUTO, SECOND, MINUTE, HOUR.
Default: AUTO. An appropriate interval is chosen based on the data and the
column date/datetime/time format.
specifies whether minor
ticks are displayed.
Interaction: This option is ignored if the DISPLAY= option does not display tick marks,
or if the TICKVALUELIST= option is used.
specifies whether to
split the tick values on an X or X2 axis, if possible. This option
is not available for a Y or Y2 axis. For example, with INTERVAL= MONTH, this is how tick values are
split:
typically, fewer tick
values fit, causing thinning, rotation, or staggering of the values.
See the TICKVALUEFITPOLICY= option.
specifies a policy
for avoiding tick value collision on an X or X2 axis. This option
is not available for a Y or Y2 axis.
The collision-avoidance
policy that is most effective depends on the number of tick values,
their length, and the length of the axis. For an X or X2 axis, the
policy can be one of the following:
specifies how to format
the values for major tick marks.
Default: The default format used by the INTERVAL= option. The default does not apply
if TICKVALUELIST= is specified.
A SAS date, time, or
datetime format to control how the major tick values are displayed.
This format must be in the same duration units as the data column(s)
mapped to a time axis: TIME, DATE, or DATETIME and should be appropriate
for the value of the INTERVAL= option. For example, if INTERVAL=MONTH
and there are two years of data displayed on the axis, choosing TICKVALUEFORMAT=YEAR.
would result in several ticks having the same year value.
Restriction: GTL currently honors most but not every SAS format. For details,
see SAS Formats Not Supported.
specifies the tick
values for a time axis as list.
Requirement: The list must be enclosed in parentheses and each item separated
by a blank. The items in the list must be in the same duration units
as the data mapped to the axis: TIME, DATE, or DATETIME. The values
can be expressed as SAS TIME, DATE, or DATETIME constants (for example,
"13:23"T, "11MAY06"D, or "11MAY06:13:23"DT) or their numeric equivalents.
Restriction: If TICKVALUEPRIORITY= is set to FALSE, this option does
not extend the data range of the axis. If the values fall within the
default data range or that specified by the VIEWMIN= or VIEWMAX= options, they are used.
The values in the
list are formatted according to the format specified on the TICKVALUEFORMAT= option. If TICKVALUEFORMAT= is not
used, the values are formatted according to the column format (the
default TICKVALUEFORMAT value is not applied to these values).
specifies the maximum
data value to include in the display. For more information, see Adjusting the Axis View.
specifies the minimum
data value to include in the display. For more information, see Adjusting the Axis View.