Tower charts

GDDM-PGF V2R1.3 Application Programming Guide

Tower charts

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

Tower charts are three-dimensional bar charts with numeric x axes. In addition to the x and y axes, they have a z axis. This is drawn as if perpendicular to the x,y plane. Each data value is represented by the height of a three-dimensional tower. Each component is drawn at a specified z value. Tower charts are sometimes called Manhattan or skyscraper charts.

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

CHTOWR Plots the tower chart CHSET 'BACK'|'NOBACK' Back planes 'BGBASE'|'TCBASE' Background or tower-chart color 'FILL'|'INFILL'|'NOFILL' Method of shading 'PGFS'|'NPGFS' Numeric values punctuated 'SCALETOWER'|'NOSCALETOWER' Scale tower to be drawn 'SIDE'|'NOSIDE' Side planes to be drawn 'TOWERTICK'|'NOTOWERTICK' Major tick marks to be drawn 'ZPICK'|'XPICK' Pick attributes according to tower position on Z or x axis CHZSET 'AXIS'|'NOAXIS' Axis drawn 'GRID'|'NOGRID' Grid drawn 'NTICK'|'PTICK'|'XTICK'|'PLAIN' Tick-mark style 'NUMERIC'|'ALPHANUMERIC' Type of label CHPAT Shading-pattern table values CHCOL Basic color table for shading CHLC Line-color table CHLT Line-type table CHLW Line-width table CHTPRJ Set projection for next tower chart

Here is a typical specification for a tower chart:


     DCL X_DATA(5)  FLOAT DEC(6) INIT(1.1, 2.6, 3.3, 4.9, 7.7);
     DCL Y_DATA(20) FLOAT DEC(6) INIT( 31,  65,  97,  11,  21,
                                       88,  10,  98,  98,   3,
                                       43,  40,  67,  23,  54,
                                       94,  35,  59,  83,  43);
     DCL Z_DATA(4) FLOAT DEC(6) INIT(1,3,4,6);

     CALL CHTOWR(1,4,5,Z_DATA,X_DATA,Y_DATA);

The first parameter to the CHTOWR call is not used by PG routines; it must be 0 or 1. The second parameter specifies, in this example, that there are four different z values - four components, in other words. The third parameter states that each component has five data values. The remaining parameters are the z, x, and y values.

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