The SGPLOT procedure (as well as other ODS Graphics procedures) does a great job of creating nice- looking output with very little coding. However, there are times when you want to make adjustments to the output's appearance. For those occasions, we have an ATTRS for that!
The statements in PROC SGPLOT include many options that enable you to change the attributes for parts of the plot. Each of these options ends in ATTRS, which makes them easy to find in code.
Before you can change the attributes, you need to know which part of the plot you want to change. For example, do you want to change the color of the line, the marker symbol, the size of the label font, and so on? Once you know the part of the graph that you want to change, you can search the PROC SGPLOT documentation for an ATTRS option.
In the following PROC SGPLOT code, we have added some ATTRS options to demonstrate the types of changes you can make to a graph.
proc sgplot data=sashelp.class; vbar age / stat=freq datalabel datalabelattrs=(size=12pt color=blue) fillattrs=(color=cx66A5A0) transparency=0.3 dataskin=matte name='bar' legendlabel='Frequency of age'; vline age / stat=percent markers markerattrs=(symbol=circlefilled color= cx01665E size=12px) lineattrs=(color=cxD05B5B thickness=3px) curvelabel='Percent Line' curvelabelattrs=(size=11pt style=italic) curvelabelloc=inside curvelabelpos=min name='vline' legendlabel='Percent of age' y2axis; refline 4 / axis=y lineattrs=(pattern=2 thickness=2px) label='Refline' labelattrs=(size=12pt) labelpos=min labelloc=inside; xaxis valueattrs=(size=10pt color=navy); yaxis labelattrs=(size=12pt weight=bold) offsetmin=0; keylegend 'bar' 'vline' / title='My legend' titleattrs=(color=blue size=14pt) valueattrs=(size=12pt) noborder; run;
The figure below shows the graph that is produced by this PROC SGPLOT code. In the figure, some labels are added to help you identify the part of the graph that is modified using an ATTRS option. Note that this graph depicts only some of the ATTRS options that are available. For other ATTRS options, see the SAS® 9.4 ODS Graphics: Procedures Guide, Sixth Edition for the specific plot statement that you want to use.
In this figure:
- The LABELATTRS= option enables you to change the color, font family, font weight, font style, and size for the axis or reference line labels.
- The LINEATTRS= option enables you to change the color, pattern, and thickness for the plot line.
- The CURVELABELATTRS= option enables you to change the color, font family, font weight, font style, and size for the text that is added by the CURVELABEL= option.
- The DATALABELATTRS= option enables you to change the color, font family, font weight, font style, and size for the text that is added by the DATALABEL= option.
- The MARKERATTRS= option enables you to change the color, size, and symbol for the plot markers.
- The FILLATTRS= option enables you to change the color and transparency of the bar colors.
- The VALUEATTRS= option enables you to change the color, font family, font weight, font style, and size for the axis tick-value labels or legend value labels.
- The TITLEATTRS= option enables you to change the color, font family, font weight, font style, and size for the legend title.
For more information about attribute options, see the Commonly Used Attribute Options section of the SAS® 9.4 ODS Graphics: Procedures Guide, Sixth Edition.
The ATTRS options affect all of the output that is produced by that statement. This means that if you include the GROUP= option, all of the groups use the attributes that are specified in the ATTRS options. This behavior is great if you want all of the lines to use the same line pattern, but it can be a problem if you want to specify colors for each of your lines.
Beginning with SAS 9.4, the STYLEATTRS (notice the ATTRS ending) statement is part of the SPLOT (and SGPANEL) procedure to enable you to define attributes for grouped data.
For example, the following code uses the DATACONTRASTCOLORS= option to specify the colors for the marker symbols and the DATASYMBOLS= option to specify the symbols that are to be used.
ods graphics / attrpriority=none; proc sgplot data=sashelp.class; styleattrs datacontrastcolors=(pink blue) datasymbols=(circlefilled squarefilled); scatter x=age y=height / group=sex markerattrs=(size=10px); xaxis valueattrs=(size=12pt) labelattrs=(size=14pt); yaxis valueattrs=(size=12pt) labelattrs=(size=14pt); keylegend / valueattrs=(size=12pt) titleattrs=(size=14pt); run;
You also might need to add the ATTRPRIORITY=NONE option in your ODS GRAPHICS statement to cycle the colors and symbols as expected. For more information about how the attributes are applied to the grouped values, see the How the Attributes Are Cycled section of the SAS® 9.4 ODS Graphics: Procedures Guide, Sixth Edition.
The attributes that are listed in the STYLEATTRS statement are associated with the group values in the order in which they appear in the data set. This behavior can cause the same value to be associated with a different color when you use the same code with another set of data.
To associate an attribute with a specific data value, you can define an attribute map. The attribute map is a data set, referenced in the DATTRMAP= option in the PROC SGPLOT statement, which includes variables that indicate to the SGPLOT procedure how to assign attributes to the group variable values.
Within the attribute map, the ID variable identifies the variables that are specific to a particular set of group values. The VALUE variable identifies the data value for the group variable that you want to associate with attributes. Note that if the variable for the GROUP= option has an associated format, the VALUE variable in the attribute map needs to contain the formatted value.
The other variables in the attribute map data set define attributes such as color, symbol, line thickness, and so on.
For example, the following code defines an attribute map to assign the color pink and the filled-circle symbol to group value F and the color blue and the filled-square symbol to the group value M:
data myattrmap; id='scattersymbols'; length markersymbol $12; input value $ markercolor $ markersymbol $; datalines; F pink circlefilled M blue squarefilled ; proc sgplot data=sashelp.class dattrmap=myattrmap; scatter x=age y=height / group=sex markerattrs=(size=10px) attrid=scattersymbols; xaxis valueattrs=(size=12pt) labelattrs=(size=14pt); yaxis valueattrs=(size=12pt) labelattrs=(size=14pt); keylegend / valueattrs=(size=12pt) titleattrs=(size=14pt); run;
Your attribute-map data set can contain multiple attribute maps, using a different value for the ID variable to distinguish each of the attribute maps. For more information about attribute maps, see the Using Attribute Maps to Control Visual Attributes section of the SAS® 9.4 ODS Graphics: Procedures Guide, Sixth Edition.
As you can see, there are many ways to assign attributes to plot elements. So, the next time you want to make a change to the visual appearance of your graph, remember that we have an ATTRS for that!
If you would like to see how to make attribute changes using a style template, read Dan Heath’s 2017 SAS Global Forum paper, Diving Deep into SAS® ODS Graphics Styles.