GraphiC Example Programs

Annotated GraphiC Plot (Sample.C)

/****************************************************************************
        (c) 1984 - 2003 by Scientific Endeavors Corporation.
        All rights reserved.

        This program plots a single curve on a set of 2-D linear axes. Except for
        color(), sympick(), and grid(), this simple example program uses only
        the minimum calls needed to produce a GraphiC plot.
****************************************************************************/

#include <graphic.h>                           /* Include all needed files */

#if TCQ                                 /* Set stack for Borland (Turbo) C */
extern unsigned _stklen = 0x3000;
#endif

/****************************************************************************
        Main program
****************************************************************************/
void GPC_MAIN(void)
{
    float *x, *y;
    int i, nxdiv, nydiv, npts;
    npts = 301;                      /* The # of points in x and y vectors */

    x = (float *)gpcalloc(npts, sizeof(float));
    y = (float *)gpcalloc(npts, sizeof(float));
    if(x == (float *)NULL || y == (float *)NULL) {
            GPC_PUTS("SAMPLE: Could not allocate data arrays");
            goto EndOfApp;
    }
    
    bgnplot(1, 'g', "sample.tkf");     /* Parameters: 1 - draw plot on screen
                                                'g' - graphics mode
                                       "sample.tkf" - .TKF file name   */
    startplot(WHITE);
    metricunits(0);                        /* Ensure scaling in inch units */
    font(1, "simplex.fnt", '\310');              /* Loads your chosen font */
    page(9.0f, 6.884f);                              /* Sets the page size */
                      /* This is the same aspect ratio as 4095 by 3132 */
    area2d(7.6f, 5.5f);                       /* Sets the area of the plot */
    for (i = 0; i < npts; i++) {                       /* Generate data */
            y[i] = .3f * i;
            x[i] = (y[i] * y[i]) / 2.f;
    }
    color(BLACK);                  /* Axis names and heading will be black */
    xname("\310X-Axis");
    yname("Y-Axis");
    heading("SAMPLE PLOT");
    grid(9);                /* Draws grid through tick marks, 9 - fine dot */
    nxdiv = 5;                   /* Sets the desired # of x-axis divisions */
    nydiv = 6;                   /* Sets the desired # of y-axis divisions */
    color(GREEN);                                 /* Green axes and labels */
    scales(nxdiv, nydiv, x, y, npts);         /* Draws and scales the axes */
    color(RED);                                               /* Red curve */
    sympick(12);                                  /* Filled circle symbols */
    curve(x, y, npts, 10);
    endplot();         /* Finishes plot and waits for instructions to exit or
                         draw next plot. Resets file pointers and defaults */
    stopplot();          /* Close files, return to text mode, exit program */
EndOfApp:
    gpcfree((void **)&x);
    gpcfree((void **)&y);
}

Other Example Programs

• BAR3D.C
  An example showing how to plot 3-D bars.
• BARTEST.C
  Illustrates how to create a bar graph and uses the GraphiC legend facility.
• BESS.C
  An example of a shaded 3-D surface plot with a projected 2-D contour plot and projected 2-D axes and grids.
• CLRTEST.C
  Semilog plot with a legend and string labels.
  gwindow() excludes all drawing from a specified rectangle.
  rightax() creates a second y axis on the right-side of the plot.
• CNTTEST.C
  Contour plots can be created with different line styles and colors, and height labels may be placed on the contours.
• D2TEST.C
  Illustrates how you can place multiple plots in  a single frame by using a call to page() and pgshift() for each one.
• D3TEST.C
  A simple example of a 3-D surface plot. 3-D curves drawn uaing curv3d().
• DELAYS.C
  Uses the polar plot function wedge() to create a clock plot — a useful way of showing discrete data with daily cycles.
• ERFTEST.C
  This example plots a curve on an error-function grid to display a normal distribution.
• EXH.C
  A picture of the E and H vectors for an electromagnmetic plane wave.
• FERMI.C
  Illustrates why simultaneous plots are useful and how to make them.
• FNTTEST.C
  GraphiC allows you to access and manipulate numerous fonts.
• INTEST.C
  GraphiC's insert() command allows you to insert a TKF file into a new plot.
• JCONT.C
  Stacked and projected contours are used in conjunction with a 3-D surface
• LOGTEST.C
  Examples of logarithmic axes using both self-scaling and predefined axes.
• MACHII.C
  An example showing how to make filled contours from random input data.
• ORBITS.C
  This example shows how to plot multiple 3-D surfaces and 2-D projections of the same plot.
• PIETEST.C
  A simple pie chart with a pulled-out sector.
• POLTEST.C
  Polar plot with a logarithmic radial scale.
  Polar plot with a linear radial scale.
• R3TEST.C
  This plot illustrates the use of randomly-spaced data points to generate a 3-D surface plot and contour plot
• RATES.C
  Illustrates the use of a box-and-whiskers plot to display the statistical spread of data points.
• SMTEST.C
  Smith charts are used for transmission line calculations.
• TRITEST.C
  Triangle plots provide for the graphic display  of an attribute of a three-component mixture.
• TZTEST.C
  This example shows three ways of presenting the data from aircraft flying over the U.S. during one hour..
• VFIELD.C
  This program  illustrates the use of the vector() function to display a vector field.