Q47002: How to Change the Size of a Presentation Graphics Chart

Article: Q47002
Product(s): See article
Version(s): 2.00
Operating System(s): MS-DOS
Keyword(s): ENDUSER | S_QuickAsm | mspl13_c
Last Modified: 18-AUG-1989

Question:

How can the size of a chart be changed so that you can use part of the
screen to output explanatory text?

Response:

This capability is built into the charting environment. The chartenv
structure is defined as follows:

           typedef struct {
             short          charttype;
                                /* _PG_BAR, _PG_COLUMN, _PG_LINE, etc.*/
             short          chartstyle;
                                /* style for selected chart type      */
             windowtype     chartwindow;
                                /* SIZE OF WINDOW FOR CHART!!!!!      */
             windowtype     datawindow;
                                /* size of window for chart data      */
             titletype      maintitle; /* main chart title            */
             titletype      subtitle;  /* chart sub-title             */
             axistype       xaxis;
                                /* structure for customizing x-axis   */
             axistype       yaxis;
                                /* structure for customizing y-axis   */
             } chartenv;

The size can be changed by modifying the elements of the "chartwindow"
element of the "chartenv" structure. The "chartwindow" element is of
"windowtype", which is defined as follows:

            typedef struct {
               short  x1;        /* left edge of window in pixels     */
               short  y1;        /* top edge of window in pixels      */
               short  x2;        /* right edge of window in pixels    */
               short  y2;        /* bottom edge of window in pixels   */
               short  border;    /* TRUE=border, FALSE=no border      */
               short  background;/* palette color for window bkground */
               short  borderstyle; /* style bytes for window border   */
               short  bordercolor; /* palette color for window border */
               } windowtype;

Therefore, if the program has defined a variable "env" of "chartenv"
type, the chart can be sized by changing env.chartwindow.x1,
env.chartwindow.y1, env.chartwindow.x2, and env.chartwindow.y2. The
following program demonstrates making these changes to a simple bar
chart:

/*-------------------------------------------------------------------*/
/* MINIBAR.C: This program demonstrates sizing the entire chart so   */
/* that it will fit in the upper-left quarter of the screen, leaving */
/* the remainder of the screen available for other uses. The chart   */
/* is a simple default bar chart, but the principle is the same,     */
/* regardless of chart type.                                         */

#include <conio.h>
#include <string.h>
#include <graph.h>                 /* required include files */
#include <pgchart.h>

#define MONTHS 12

typedef enum {FALSE, TRUE} boolean;

float far value [MONTHS] =          /*value (series) data array */
{
 (float)1.00, (float)2.00, (float)3.00, (float)4.00,
 (float)5.00, (float)6.00,(float)7.00, (float)8.00,
 (float)9.00, (float)10.00, (float)11.00, (float)12.00
  };

char far *category[MONTHS] =         /* category data array */
  {
  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  "Jly", "Aug", "Sep", "Oct","Nov", "Dec"
  };

main()

{
chartenv env;                     /* define chart environment variable */

_setvideomode(_ERESCOLOR);        /* set to graphics mode */

/* initialize chart library and a default bar chart */
_pg_initchart();

_pg_defaultchart(&env, _PG_BARCHART, _PG_PLAINBARS);

/* set the chart size to the upper left quarter of the screen   */

env.chartwindow.x1 = 0;
env.chartwindow.y1 = 0;
env.chartwindow.x2 = 320;
env.chartwindow.y2 = 175;

if(_pg_chart (&env,category,value, MONTHS)) /* call to charting routine*/
        {_setvideomode(_DEFAULTMODE);       /* error trap...*/
         _outtext("error, can't draw chart");
         }
     else
        {
         getch();                          /* wait for a keystroke */
         }
        _setvideomode(_DEFAULTMODE);      /* reset the video mode  */

         return(0);
         }

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