Q62627: M6101 on PG Scatter Charts with Autoscaling Off

Article: Q62627
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: 21-JAN-1991

If you turn autoscaling off in any Presentation Graphics scatter
chart, you will receive a run-time error M6101 -- invalid math
operation -- when the _pg_chartscatter() run-time function is called.

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

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

The following code is from the SCAT.C sample program, which is the
sample program found in the online help for the _pg_chartscatter and
_pg_chartscatterms routines. Note the added lines, which turn off
autoscaling. Compile the program, then link with the GRAPHICS.LIB and
PGCHART.LIB files. Running the application will duplicate the M6101
run-time error.

/* SCAT.C illustrates presentation graphics scatter chart functions
 * including:
 *    _pg_chartscatter   _pg_chartscatterms
 */

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

#define ITEMS  5
#define SERIES 2
float _far people[SERIES][ITEMS]  = { { 235.F, 423.F, 596.F, 729.F,
                                                  963.F },
                             { 285.F, 392.F, 634.F, 801.F, 895.F }
                                                                 };
float _far profits[SERIES][ITEMS] = { { 0.9F,  2.3F,  5.4F,  8.0F,
                                                             9.3F  },
                               { 4.2F,  3.4F,  3.6F,  2.9F,  2.7F  }
                                                                   };
char  _far *companies[SERIES] = { "Goodstuff,Inc.", "Badjunk & Co." };

void main()
{
        chartenv env;

        if( !_setvideomode( _MAXRESMODE ) ) /* Find a valid graphics
                                                               mode */
                exit( 1 );
        _pg_initchart();                 /* Initialize chart system */

        /* Show single-series scatter chart. */
        _pg_defaultchart (&env, _PG_SCATTERCHART, _PG_POINTONLY );
        strcpy( env.maintitle.title, "Goodstuff, Inc." );
        strcpy( env.xaxis.axistitle.title, "Employees" );
        strcpy( env.yaxis.axistitle.title, "Profitability" );

/****** Note : Turn one of these two to '0' or off, or uncomment
        this section to cause problem.                          */

/*        env.xaxis.autoscale=1;   */
/*        env.yaxis.autoscale=0;   */

/********************************************************************/

        _pg_chartscatter( &env, people[0], profits[0], ITEMS );
        getch();
        _clearscreen( _GCLEARSCREEN );

        /* Show multiseries scatter chart. */
        _pg_defaultchart (&env, _PG_SCATTERCHART, _PG_POINTONLY );
        strcpy( env.xaxis.axistitle.title, "Employees" );
        strcpy( env.yaxis.axistitle.title, "Profitability" );
        _pg_chartscatterms( &env, (float _far *)people,
             (float _far *)profits, SERIES, ITEMS, ITEMS, companies );
        getch();

        _setvideomode( _DEFAULTMODE );
}

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