Q66779: PG Chart Displays May Have Uneven Spacing Between Bars

Article: Q66779
Product(s): See article
Version(s): 6.00 6.00a
Operating System(s): MS-DOS
Keyword(s): ENDUSER | S_QUICKC buglist6.00 buglist6.00a | mspl13_c
Last Modified: 14-JAN-1991

If a large number of bars or pie slices are displayed in a
Presentation Graphics chart, the spacing between the bars or pie
slices may be inconsistent. In most situations, any variation between
the sizes of bar separations is minimal and generally unnoticeable.
The sample program below demonstrates this problem on a bar, column,
and pie chart.

Microsoft has confirmed this to be a problem in C versions 6.00 and
6.00a and QuickC versions 2.00, 2.01, 2.50, and 2.51 (buglist2.00,
buglist2.01, buglist2.50, and buglist2.51). We are researching this
problem and will post new information here as it becomes available.

Sample Code
-----------

#include <conio.h>
#include <stdlib.h>
#include <graph.h>
#include <string.h>
#include <pgchart.h>

#define COUNTRIES 25

float _far value[COUNTRIES] = { 18.9F,  7.7F, 42.5F, 14.3F, 35.2F,
                                21.3F, 42.5F, 14.3F, 35.2F, 21.3F,
                                42.5F, 14.3F, 35.2F, 21.3F, 32.6F,
                                42.5F, 14.3F, 35.2F, 21.3F, 32.6F,
                                42.5F, 14.3F, 35.2F, 21.3F, 32.6F };
char _far *category[COUNTRIES] = { "AB","YZ","UR","GD","USA","UK",
                                   "UR","GD","USA","UK","UR","GD",
                                   "USA","UK","Other","UR","GD",
                                   "USA","UK","Other","UR","GD",
                                   "USA","UK","Other" };
short _far explode[COUNTRIES] = { 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
                                  1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1,
                                  1, 1, 1 };

void main(void)
{
   chartenv env;

   if( !_setvideomode( _MAXRESMODE ) )
           exit( 1 );

   _pg_initchart();              // Initialize chart system

   // Single-series bar chart

   _pg_defaultchart( &env, _PG_BARCHART, _PG_PLAINBARS );
   strcpy( env.maintitle.title, "Widget Production" );
   _pg_chart( &env, category, value, COUNTRIES );
   getch();
   _clearscreen( _GCLEARSCREEN );

   // Single-series column chart

   _pg_defaultchart( &env, _PG_COLUMNCHART, _PG_PLAINBARS );
   strcpy( env.maintitle.title, "Widget Production" );
   _pg_chart( &env, category, value, COUNTRIES );
   getch();
   _clearscreen( _GCLEARSCREEN );

   // Pie chart

   _pg_defaultchart( &env, _PG_PIECHART, _PG_PERCENT );
   strcpy( env.maintitle.title, "Widget Production" );
   _pg_chartpie( &env, category, value, explode, COUNTRIES );
   getch();

   _setvideomode( _DEFAULTMODE );
}

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