Q47004: Overlaying Charts and Displaying Multiple Charts on the Screen

Article: Q47004
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

It is not possible to overlay charts of the same size, as the charting
routines clear the current viewport before drawing a chart. However,
it is possible to display a small chart on top of a larger one, or to
display charts side-by-side on the screen. The following programs
demonstrate the steps necessary to size charts and display more than
one chart at a time. PROG1.C overlays two small charts on top of a
full-screen bar chart. PROG2.C displays four charts, one in each
corner of the screen.

The same technique can be used to place a chart onto an existing
screen. Define the coordinates for the area in which you wish the
chart to appear, and assign these coordinates to the "chartwindow"
structure of the charting environment. Only this area is cleared when
the chart is drawn.

/* PROG1.C  ---------------------------------------------------------*/
/* This program demonstrates overlaying charts. The initial chart    */
/* drawn is a simple bar chart, which uses the entire screen. The    */
/* second chart drawn is a column chart, which is displayed in a     */
/* a viewport (x1=400, y1=50, x2=550, y2=175). This is displayed     */
/* overlayed on the original bar chart. The third chart drawn is     */
/* a pie chart, which is also drawn in a viewport (x1=350, y1=300,   */
/* x2=525, y2=420), overlayed on the original barchart.              */

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

#define COUNTRIES 5
float far value[COUNTRIES] =    { 42.5, 14.3, 35.2, 21.3, 32.6    };
char far *category[COUNTRIES] = { "A","B","C","D","E" };
short far explode[COUNTRIES] =  { 0,1,0,1,0};

void main(void)
{
    chartenv env;                       /* define chart environment */

    _setvideomode(_VRES16COLOR);        /* set video mode...         */

    _pg_initchart();                    /* Initialize chart system    */

    /* Single-series bar chart. (full-screen) */
    _pg_defaultchart( &env, _PG_BARCHART, _PG_PLAINBARS );
    strcpy( env.maintitle.title, "Widget Production" );
    _pg_chart( &env, category, value, COUNTRIES );

    /* Single-series column chart. (viewport at upper right) */
    _pg_defaultchart(&env, _PG_COLUMNCHART, _PG_PLAINBARS);
    strcpy( env.maintitle.title, "Widget Production" );
    env.chartwindow.x1 = 400;
    env.chartwindow.y1 = 50;
    env.chartwindow.x2 = 550;
    env.chartwindow.y2 = 175;

    _pg_chart( &env, category, value, COUNTRIES );

    /* Pie chart. (viewport at lower right) */
    _pg_defaultchart( &env, _PG_PIECHART, _PG_PERCENT );
    strcpy( env.maintitle.title, "Widget Production" );
    env.chartwindow.x1 = 350;
    env.chartwindow.y1 = 300;
    env.chartwindow.x2 = 525;
    env.chartwindow.y2 = 420;

    _pg_chartpie( &env, category, value, explode, COUNTRIES );
    getch();

    _setvideomode(_DEFAULTMODE);
}

/* PROG2.C  ---------------------------------------------------------*/
/* This program demonstrates placing charts side-by-side on the      */
/* screen. It displays four different charts, each taking up one     */
/* quarter of the screen.                                            */

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

#define COUNTRIES 5
float far value[COUNTRIES] =    { 42.5, 14.3, 35.2, 21.3, 32.6    };
float far axis2[COUNTRIES] =    { 1.0, 2.0, 3.0, 4.0, 5.0};
char far *category[COUNTRIES] = { "A","B","C","D","E" };
short far explode[COUNTRIES] =  { 0,1,0,1,0};

void main(void)
{
    chartenv env;                       /* define chart environment */

    _setvideomode(_ERESCOLOR);        /* set video mode...         */

    _pg_initchart();                    /* Initialize chart system    */

    /* Single-series bar chart. (viewport at upper left) */
    _pg_defaultchart( &env, _PG_BARCHART, _PG_PLAINBARS );
    strcpy( env.maintitle.title, "Widget Production" );
    env.chartwindow.x1 = 0;
    env.chartwindow.y1 = 0;
    env.chartwindow.x2 = 320;
    env.chartwindow.y2 = 175;

    _pg_chart( &env, category, value, COUNTRIES );

    /* Single-series column chart. (viewport at upper right) */
    _pg_defaultchart(&env, _PG_COLUMNCHART, _PG_PLAINBARS);
    strcpy( env.maintitle.title, "Widget Production" );
    env.chartwindow.x1 = 320;
    env.chartwindow.y1 = 0;
    env.chartwindow.x2 = 639;
    env.chartwindow.y2 = 175;

    _pg_chart( &env, category, value, COUNTRIES );

    /* Pie chart. (viewport at lower left) */
    _pg_defaultchart( &env, _PG_PIECHART, _PG_PERCENT );
    strcpy( env.maintitle.title, "Widget Production" );
    env.chartwindow.x1 = 0;
    env.chartwindow.y1 = 175;
    env.chartwindow.x2 = 320;
    env.chartwindow.y2 = 349;

    _pg_chartpie( &env, category, value, explode, COUNTRIES );

    /* Scatter chart. (viewport at lower right)   */
    _pg_defaultchart(&env, _PG_SCATTERCHART, _PG_POINTONLY);
    env.chartwindow.x1 = 320;
    env.chartwindow.y1 = 175;
    env.chartwindow.x2 = 639;
    env.chartwindow.y2 = 349;
    _pg_chartscatter(&env, (float far *)axis2, (float far *)value, 5);

    getch();

    _setvideomode(_DEFAULTMODE);
}

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.