Watcom C Library : perror, _pg_analyzechart, _pg_analyzechartms, _pg_analyzepie, _pg_analyzescatter, _pg_analyzescatterms
Watcom C Reference/O - P - Q - R 2021. 8. 28. 18:28
Watcom C Library Reference : perror, _pg_analyzechart, _pg_analyzechartms, _pg_analyzepie, _pg_analyzescatter, _pg_analyzescatterms
perror
Synopsis : #include <stdio.h>
void perror( const char *prefix );
Description : The perror function prints, on the file designated by stderr, the error message corresponding to the error number contained in errno. The perror function writes first the string pointed to by prefix to stderr. This is followed by a colon (":"), a space, the string returned by strerror(errno), and a newline character.
Returns : The perror function returns no value. Because the function uses the fprintf function, errno can be set when an error is detected during the execution of that function.
See Also : strerror
Example :
#include <stdio.h>
void main( )
{
FILE *fp;
fp = fopen( "data.fil", "r" );
if( fp == NULL ) {
perror( "Unable to open file" );
}
}
Classification : ANSI
Systems : All
_pg_analyzechart, _pg_analyzechartms
Synopsis : #include <pgchart.h>
short _FAR _pg_analyzechart( chartenv _FAR *env,
char _FAR *_FAR *cat,
float _FAR *values, short n );
short _FAR _pg_analyzechartms( charteny _FAR *env,
char _FAR *_FAR *cat,
float _FAR *values,
short nseries,
short n, short dim,
char _FAR * _FAR *labels );
Description : The _pg_analyzechart functions analyze either a single-series or a multi-series bar, columnor line chart. These functions calculate default values for chart elements without actually displaying the chart.
The _pg_analyzechart function analyzes a single-series bar, column or line chart. The chart environment structure env is filled with default values based on the type of chart and the values of the cat and values arguments. The arguments are the same as for the _pg_chart function.
The _pg_analyzechartms function analyzes a multi-series bar, column or line chart. The chart environment structure env is filled with default values based on the type of chart and the values of the cat, values and labels arguments. The arguments are the same as for the _pg_chartms function.
Returns : The _pg_analyzechart functions return zero if successful; otherwise, a non-zero value is returned
See Also : _pg_defaultchart, _pg_initchart, _pg_chart, _pg_chartpie, _pg_chartscatter, _pg_analyzepie, _pg_analyzescatter
Example :
#include <graph.h>
#include <pgchart.h>
#include <string.h>
#include <conio.h>
#define NUM_VALUES 4
char _FAR *categories [NUM_VALUES] = { "Jan", "Feb", "Mar", "Apr" };
float values [NUM_VALUES] = { 20, 45, 30, 25 };
main( )
{
chartenv env;
_setvideomode( _VRES16COLOR );
_pg_initchart( );
_pg_defaultchart( &eny, _PG_COLUMNCHART, _PG_PLAINBARS );
strcpy( env.maintitle.title, "Column Chart" );
_pg_analyzechart( &eny, categories, values, NUM_VALUES );
/* use manual scaling */
env.yaxis.autoscale = 0;
env.yaxis.scalemin = 0.0;
env.yaxis.scalemax = 100.0;
env.yaxis.ticinterval = 25.0;
_pg_chart( &env, categories, values, NUM_VALUES );
getch( );
_setvideomode( _DEFAULTMODE );
}
Classification : PC Graphics
Systems : _pg_analyzechart - DOS, QNX
_pg_analyzechartms -DOS, QNX
_pg_analyzepie
Synopsis : #include <pgchart.h>
short _FAR _pg_analyzepie( chartenv _FAR *env,
char _FAR * _FAR *cat,
float _FAR *values,
short _FAR *explode, short n );
Description : The _pg_analyzepie function analyzes a pie chart. This function calculates default values for chart elements without actually displaying the chart.
The chart environment structure env is filled with default values based on the values of the cat, values and explode arguments. The arguments are the same as for the _pg_chartpie function.
Returns : The _pg_analyzepie function returns zero if successful; otherwise, a non-zero value is returned.
See Also : _pg_defaultchart, _pg_initchart, _pg_chart, _pg_chartpie, _pg_chartscatter, _pg_analyzechart, _pg_analyzescatter
Example :
#include <graph.h>
#include <pgchart.h>
#include <string.h>
#include <conio.h>
#define NUM_VALUES 4
char _FAR *categories[NUM_VALUES] = { "Jan", "Feb", "Mar", "Apr" };
float values[NUM_VALUES] = { 20, 45, 30, 25 };
short explode[NUM_VALUES] = { 1, 0, 0, 0 };
main( )
{
chartenv env;
_setvideomode( _VRES16COLOR );
_pg_initchart( );
_pg_defaultchart( &eny, _PG_PIECHART, _PG_NOPERCENT );
strcpy( env.maintitle.title, "Pie Chart" );
env.legend.place = _PG_BOTTOM;
_pg_analyzepie ( &env, categories, values, explode, NUM_VALUES );
/* make legend window same width as data window */
eny.legend.autosize = 0;
eny.legend.legendwindow.x1 = env.datawindow.x1;
eny.legend.legendwindow.x2 = env.datawindow.x2;
_pg_chartpie( &eny, categories, values, explode, NUM_VALUES );
getch( );
_setvideomode( _DEFAULTMODE );
}
Classification : PC Graphics
Systems : DOS, QNX
_pg_analyzescatter, _pg_analyzescatterms
Synopsis : #include <pgchart.h>
short _FAR _pg_analyzescatter( chartenv _FAR *env,
float _FAR *x,
float _FAR *y, short n);
short _FAR _pg_analyzescatterms( chartenv _FAR *env,
float _FAR *x, float _FAR *y,
short nseries, short n, short dim,
char _FAR *_FAR *labels );
Description : The _pg_analyzescatter functions analyze either a single-series or a multi-series scatter chart. These functions calculate default values for chart elements without actually displaying the chart.
The _pg_analyzescatter function analyzes a single-series scatter chart. The chart environment structure env is filled with default values based on the values of the x and y arguments. The arguments are the same as for the _pg_chartscatter function.
The _pg_analyzescatterms function analyzes a multi-series scatter chart. The chart environment structure env is filled with default values based on the values of the x, y and labels arguments. The arguments are the same as for the _pg_chartscatterms function.
Returns : The _pg_analyzescatter functions return zero if successful; otherwise, a non-zero value is returned.
See Also : _pg_defaultchart, _pg_initchart, _pg_chart, _pg_chartpie, _pg_chartscatter, _pg_analyzechart, _pg_analyzepie
Example :
#include <graph.h>
#include <pgchart.h>
#include <string.h>
#include <conio.h>
#define NUM_VALUES 4
#define NUM_SERIES 2
char _FAR *labels[NUM_SERIES] = { "Jan", "Feb" };
float x[NUM_SERIES] [NUM_VALUES] = { 5, 15, 30, 40, 10, 20, 30, 45 };
float y[NUM_SERIES] [NUM_VALUES] = { 10, 15, 30, 45, 40, 30, 15, 5 }
main( )
{
chartenv env;
_setvideomode( _VRES16COLOR );
_pg_initchart( );
_pg_defaultchart( &eny, _PG_SCATTERCHART, _PG_POINTANDLINE );
strcpy( eny.maintitle.title, "Scatter Chart" );
_pg_analyzescatterms( &env, x, y, NUM_SERIES, NUM_VALUES, NUM_VALUES, labels );
/* display x-axis labels with 2 decimal places */
eny.xaxis.autoscale = 0;
eny.xaxis.ticdecimals = 2;
_pg_chartscatterms( denv, x, y, NUM_SERIES, NUM_VALUES, NUM_VALUES, labels );
getch( );
_setvideomode( _DEFAULTMODE );
}
Classification : PC Graphics
Systems : _pg_analyzescatter -DOS, QNX
_pg_analyzescatterms -DOS, QNX
This manual describes the WATCOM C library for DOS, Windows, and OS/2, It includes the Standard C Library (as defined in the ANSI C Standard).
WATCOM C Language Reference manual describes the ANSI C Programming language and extensions to it which are supported by WATCOM C/C++ (32bit)
