Pie charts

GDDM-PGF V2R1.3 Application Programming Guide

Pie charts

GDDM-PGF V2R1.3 Application Programming Guide
SC33-0913-01

Pie charts are noticeably different from the previous chart types. They do not have any axes, and the data for a multicomponent pie chart is displayed differently from that of other multicomponent charts.

This difference is illustrated in Figure 26, which shows two charts representing the same data, a multiple pie chart and a composite bar chart.

Figure 26. Comparison of composite bar chart with multiple pie chart

The calls and options that affect pie charts are listed below. The default options are shown first.

CHPIE Plots the pie chart CHSET 'PERPIE'|'ABPIE' Percentage or absolute data 'NOVALUES'|'VALUES' Values on pie slices 'PIEKEY'|'SPIDER' Spider labels or legend 'SPISLICE'|'SPILABEL' Type of spider label if used 'NOPROPIE'|'PROPIE' Pie size proportional to total values 'FILL'|'INFILL'|'NOFILL' Shading method 'YVERTICAL'|'XVERTICAL' Orientation of multiple pies CHPAT Specify shading-pattern table values CHCOL Specify basic color table for shading CHLC Specify line-color table CHLT Specify line-type table CHLW Specify line-width table CHPCTL Specify explosion factor, tilt, and thickness CHPEXP Slices of the pie to be moved out (exploded) CHPIER Size reduction to fit multiple pies CHNUM Number of pies to be plotted if multiple calls are used CHVATT Attributes of values on pies

These are the main calls that produced the two charts:


     DCL Y_DATA(12) FLOAT DEC(6) INIT(10,12,18,     /* 1st component */
                                      20,29,26,     /* 2nd component */
                                      15,13,30,     /* 3rd component */
                                      10,22,21);    /* 4th component */
     CALL CHXLAB(3,6,'BARLEYWHEAT OATS  ');
     CALL CHKEY(4,7,'FRANCE ITALY  BELGIUM SPAIN  ');
     CALL CHBAR(4,3,Y_DATA);           /* Plot 4-component bar chart */
             ................
             ................
     DCL Y_DAT2(12) FLOAT DEC(6) INIT(10,20,15,10,  /* 1st component */
                                      12,29,13,22,  /* 2nd component */
                                      18,26,30,21); /* 3rd component */
     CALL CHXLAB(3,6,'BARLEYWHEAT OATS  ');
     CALL CHKEY(4,7,'FRANCE ITALY  BELGIUM SPAIN  ');
     CALL CHPIE(3,4,Y_DAT2);           /* Plot 3-component pie chart */

So, a component (or data group) is a different concept for a pie chart. Up to now a component has meant "all the blue bits" (blue markers joined with a blue line on a line graph, a blue layer on a surface chart, sets of blue bars on a histogram or bar chart). Now a component means "one pie" instead.

CHKEY still provides the text that explains the different colors and patterns used in the chart. CHXLAB provides the pie titles.

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