GCONTOUR Procedure

Example 2: Labeling Contour Lines, Modifying the Horizontal Axis, Modifying the Legend

Features:	PLOT statement options: AUTOLABEL= HAXIS= LEGEND= NAME=
Other features:	AXIS statement options: MINOR= ORDER= LEGEND statement options: ACROSS= LABEL= POSITION= SYMBOL statement options: COLOR= FONT= HEIGHT= VALUE=
Data set:	SASHELP.LAKE
Sample library member:	GCTLABEL

This example modifies Simple Contour Plot to label contour levels with the AUTOLABEL option. The SYMBOL statement used with the AUTOLABEL option enables you to customize the attributes of the contour lines and labels.

In this example, SYMBOL1 and SYMBOL7 assign text labels, text fonts, text height, and text and line color for the first and seventh contour level lines. SYMBOL2–SYMBOL6 define the text height, and the text and line color for contour level lines 2–6.

Moreover, the LEGEND statement attributes are modified to reposition the legend closer to the data.

Labeling Contour Lines, Modifying the Horizontal Axis, Modifying the Legend

Program

goptions reset=all border;

title1 "Lake Data";
footnote1 j=r "GCTLABEL";

symbol1 value="DEEP"
        color=red
        font="Arial Rounded MT Bold"
        height=.6;
symbol2 color=green
        height=.45;
symbol3 color=blue
        height=.45;
symbol4 color=orange
        height=.45;
symbol5 color=purple
        height=.45;
symbol6 color=magenta 
        height=.45;
symbol7 value="Shallow"
        color=navy 
        font="Arial Rounded MT Bold" 
        height=.7;

legend1 position=(right middle)
        label=(position=top)
        across=1;

axis1 order=(0 to 10 by 2) minor=none;

proc gcontour data=sashelp.lake;
   plot length*width=depth/
       autolabel=(check=none)
      haxis=axis1
      legend=legend1
      name="GCTLABEL";
run;
quit;

Program Description

Set the graphics environment. Draw a BORDER around the graphics output area.

goptions reset=all border;

Define title and footnote. Add TITLE content . Add FOOTNOTE content and placement.

title1 "Lake Data";
footnote1 j=r "GCTLABEL";

Define symbol statements. SYMBOL statements define the characteristics of the lines and labels for the contour lines. Each SYMBOL statement is associated to an individual contour level starting with the first level displayed in the LEGEND.

symbol1 value="DEEP"
        color=red
        font="Arial Rounded MT Bold"
        height=.6;
symbol2 color=green
        height=.45;
symbol3 color=blue
        height=.45;
symbol4 color=orange
        height=.45;
symbol5 color=purple
        height=.45;
symbol6 color=magenta 
        height=.45;
symbol7 value="Shallow"
        color=navy 
        font="Arial Rounded MT Bold" 
        height=.7;

Define legend characteristics. The LEGEND statement controls the location and appearance of the legend. The POSITION= option specifies the position of the legend relative to the plot; RIGHT specifies the horizontal position; MIDDLE specifies the vertical position. The LABEL= option modifies the legend label; POSITION=TOP places the legend label relative to the legend entries; the ACROSS= option defines the number of columns in the legend.

legend1 position=(right middle)
        label=(position=top)
        across=1;

Define axis characteristics. The ORDER= option specifies the order in which the data values appear on the axis; the ORDER= values are displayed as the major tick marks values; MINOR=NONE suppresses all minor tick marks.

axis1 order=(0 to 10 by 2) minor=none;

Generate the contour plot. The AUTOLABEL= option labels the contour lines; (CHECK=NONE) suppresses contour label collision checking, and might lessen the time needed to compute the plot. HAXIS=AXIS1 assigns the AXIS1 definition to the horizontal axis. LEGEND=LEGEND1 assigns the LEGEND1 definition to the LEGEND. The NAME= option specifies the name of the catalog entry for the graph.

proc gcontour data=sashelp.lake;
   plot length*width=depth/
       autolabel=(check=none)
      haxis=axis1
      legend=legend1
      name="GCTLABEL";
run;
quit;