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/*
* histogram.c - procedures to build and maintain a histogram
* data structure
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include "CNplot.h"
/*
* HISTOGRAM DATA STRUCTURE
* A histogram is used to store data for a histogram plot.
* The data consists of points (x only) that are sorted into
* bins then plotted.
*/
#define NBINS 10
#define MAXBINS 1000
/*
* Given a histogram dataset, sort the data into bins and create curves
*/
void CNsort_histogram(dptr, verbose)
CNdatasetptr dptr;
int verbose;
{
CNpointptr P;
CNcurveptr Cptr;
double x1, y1, x2, y2;
double xmin, xmax, binwidth, binstart;
double dpower;
int power;
int bins[MAXBINS];
int bmax;
int i;
int curveID=0;
/* Error-check */
if (dptr == NULL) {
(void) fprintf(stderr,"CNsort_histogram: Error! NULL dataset!\n");
return;
}
if (dptr->datatype != CN_HISTOGRAM) {
(void) fprintf(stderr,
"CNsort_histogram: Error! Need a HISTOGRAM dataset!\n");
return;
}
if (dptr->histogram == NULL) {
(void) fprintf(stderr,
"CNsort_histogram: Error! NULL HISTOGRAM structure!\n");
return;
}
/* Get rid of the curvelist in the dataset first */
CNdelete_curve_list(&(dptr->curvehead), &(dptr->curvetail));
/* Get the binwidth and binstart - special treatment for xmin=xmax */
xmin = dptr->histogram->xmin;
xmax = dptr->histogram->xmax;
if ((xmax - xmin) < CN_SMALL) {
/* Just put in one bar */
/* Set binwidth */
binwidth = 0.0;
if ((dptr->data_pr.flag2 & CNbinwidth) != 0) {
binwidth = dptr->data_pr.binwidth;
} else {
/* The binwidth is on the order of the mean */
dpower = CNlog10(xmin);
power = (dpower > -CN_SMALL) ? (int)dpower : (int)dpower - 1;
binwidth = CNround_down(xmin,power);
}
if (binwidth < CN_SMALL) binwidth = 0.1;
/* Get the binstart */
if ((dptr->data_pr.flag2 & CNbinstart) != 0) {
binstart = dptr->data_pr.binstart;
} else {
binstart = xmin - 0.5*binwidth;
}
/* Set xmin, xmax to the size of 3 bars */
xmin = xmin - 1.5*binwidth;
xmax = xmax + 1.5*binwidth;
} else {
/* Default of 10 bars */
/* Set the binwidth */
if ((dptr->data_pr.flag2 & CNbinwidth) != 0) {
binwidth = dptr->data_pr.binwidth;
if ((binwidth <= 0.0) || ((xmax-xmin)/binwidth > MAXBINS))
binwidth = (xmax - xmin)/NBINS;
} else {
binwidth = (xmax - xmin)/NBINS;
}
/* If the binwidth is too small then adjust it */
if (binwidth < CN_SMALL) binwidth = 0.1;
/* Get the binstart */
if ((dptr->data_pr.flag2 & CNbinstart) != 0) {
binstart = dptr->data_pr.binstart;
} else {
dpower = CNlog10(xmax-xmin);
power = (dpower > -CN_SMALL) ? (int)dpower : (int)dpower - 1;
binstart = CNround_down(xmin,power);
}
}
/* Put the binwidth, binstart values back */
dptr->data_pr.binwidth = binwidth;
dptr->data_pr.binstart = binstart;
/* Print info */
if (verbose) {
(void) fprintf(stdout,"Histogram:\n");
(void) fprintf(stdout,"xmin = %g\n",xmin);
(void) fprintf(stdout,"xmax = %g\n",xmax);
(void) fprintf(stdout,"bin width = %g\n",binwidth);
(void) fprintf(stdout,"bin start = %g\n",binstart);
}
/* Initialize the bins */
for (i=0; i<MAXBINS; i++) bins[i] = 0;
/* Fill the bins */
for (P=dptr->histogram->pointhead; P!=NULL; P=P->next) {
i = (int)((P->x - binstart)/binwidth);
if (i>=0 && i<MAXBINS) bins[i]++;
}
/* Create the curves */
bmax = 0;
for (i=0; i<MAXBINS; i++) {
if (bins[i] > 0) {
/* Boundary */
x1 = binstart + (i )*binwidth;
x2 = binstart + (i+1)*binwidth;
y1 = -1000.0;
y2 = (double) bins[i];
/*
(void) printf("x1=%g x2=%g y1=%g y2=%g\n",x1,x2,y1,y2);
*/
/* Min/Max */
if (bins[i] > bmax) bmax = bins[i];
if (x1 < xmin) xmin = x1;
if (x2 > xmax) xmax = x2;
/* Allocate a curve data-structure */
Cptr = CNinsert_curve(&(dptr->curvehead), &(dptr->curvetail),
curveID++);
if (Cptr!=NULL) {
(void) CNinsert_point(&(Cptr->pointhead), &(Cptr->pointtail),
x1,y1,0.0,0);
(void) CNinsert_point(&(Cptr->pointhead), &(Cptr->pointtail),
x1,y2,0.0,0);
(void) CNinsert_point(&(Cptr->pointhead), &(Cptr->pointtail),
x2,y2,0.0,0);
(void) CNinsert_point(&(Cptr->pointhead), &(Cptr->pointtail),
x2,y1,0.0,0);
(void) CNinsert_point(&(Cptr->pointhead), &(Cptr->pointtail),
x1,y1,0.0,0);
/* Set the properties */
Cptr->curv_pr.filltype = dptr->histogram->filltype;
Cptr->curv_pr.flag = Cptr->curv_pr.flag & CNfilltype;
Cptr->curv_pr.fillcolor= dptr->histogram->fillcolor;
Cptr->curv_pr.flag = Cptr->curv_pr.flag & CNfillcolor;
Cptr->curv_pr.linecolor= 0;
Cptr->curv_pr.flag = Cptr->curv_pr.flag & CNlinecolor;
}
}
}
/* Reset the dataset boundaries */
dptr->bymin = 0.0;
dptr->bymax = (double) (bmax+1);
dptr->plot_pr.vymin = 0.0;
dptr->plot_pr.vymax = (double) (bmax+1);
dptr->bxmin = xmin;
dptr->bxmax = xmax;
dptr->plot_pr.vxmin = xmin;
dptr->plot_pr.vxmax = xmax;
/* Print info */
if (verbose) {
(void) fprintf(stdout, "Generated %d new curves\n",
CNcount_curves(dptr->curvehead, dptr->curvetail));
}
}
/*
* HISTOGRAM DATA STRUCTURE
* A histogram is used to store data for a histogram plot.
* The data consists of points (x only) that are sorted into
* bins then plotted.
*/
CNhistogramptr CNmake_histogram(xmin, xmax, pointhead, pointtail)
double xmin, xmax;
CNpointptr pointhead, pointtail;
{
CNhistogramptr newptr;
unsigned int size = sizeof(CNhistogram);
if ((newptr = (CNhistogramptr)malloc(size))!=NULL) {
newptr->xmin = xmin;
newptr->xmax = xmax;
newptr->filltype = CN_FILL_SOLID;
newptr->fillcolor = 5;
/* Linked lists */
newptr->pointhead = pointhead;
newptr->pointtail = pointtail;
}
return(newptr);
}
/*
* Delete histogram
*/
void CNdelete_histogram(Sptr)
CNhistogramptr Sptr;
{
/* delete all the points in Dptr */
CNdelete_point_list(&(Sptr->pointhead),&(Sptr->pointtail));
/* Now delete Sptr */
free ((char*)Sptr);
}
/*
* Print info on the histogram
*/
void CNprint_histogram(Sptr)
CNhistogramptr Sptr;
{
int npoints;
/* Count the contents of the slice */
npoints = CNcount_points(Sptr->pointhead,Sptr->pointtail);
/* Print the contents of the slice */
(void) fprintf(stdout,"Histogram: \n");
(void) fprintf(stdout," No of points = %d\n", npoints);
}
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