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/*
g3data : A program for grabbing data from scanned graphs
Copyright (C) 2000 Jonas Frantz
This file is part of g3data.
g3data is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
g3data is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Authors email : jonas.frantz@welho.com
*/
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <math.h>
#include "main.h"
/* Extern functions */
extern void Order(struct PointValue *RealPos, gint left, gint right, gint ordering);
/* Extern variables */
extern gint axiscoords[MAXNUMTABS][4][2];
extern gint **points[MAXNUMTABS];
extern gint numpoints[MAXNUMTABS];
extern gint ordering[MAXNUMTABS];
extern gdouble realcoords[MAXNUMTABS][4];
extern gboolean UseErrors[MAXNUMTABS];
extern gboolean logxy[MAXNUMTABS][2];
extern gint Action[MAXNUMTABS];
extern gchar *file_name[MAXNUMTABS];
extern gint ViewedTabNum;
/****************************************************************/
/* This function sets the numpoints entry to numpoints variable */
/* value. */
/****************************************************************/
void SetNumPointsEntry(GtkWidget *np_entry, gint np)
{
char buf[128];
sprintf(buf,"%d",np);
gtk_entry_set_text(GTK_ENTRY(np_entry),buf);
}
/****************************************************************/
/* This function returns the integer with the lesser value. */
/****************************************************************/
gint min(gint x, gint y)
{
if (x < y) return x;
else return y;
}
/****************************************************************/
/* This function calculates the true value of the point based */
/* on the coordinates of the point on the bitmap. */
/****************************************************************/
struct PointValue CalcPointValue(gint Xpos, gint Ypos, gint TabNum)
{
double alpha,beta,x21,x43,y21,y43,rlc[4]; /* Declare help variables */
struct PointValue PV;
x21=(double) axiscoords[TabNum][1][0]-axiscoords[TabNum][0][0]; /* Calculate deltax of x axis points */
y21=(double) axiscoords[TabNum][1][1]-axiscoords[TabNum][0][1]; /* Calculate deltay of x axis points */
x43=(double) axiscoords[TabNum][3][0]-axiscoords[TabNum][2][0]; /* Calculate deltax of y axis points */
y43=(double) axiscoords[TabNum][3][1]-axiscoords[TabNum][2][1]; /* Calculate deltay of y axis points */
if (logxy[TabNum][0]) { /* If x axis is logarithmic, store */
rlc[0]=log(realcoords[TabNum][0]); /* recalculated values in rlc. */
rlc[1]=log(realcoords[TabNum][1]);
}
else {
rlc[0]=realcoords[TabNum][0]; /* Else store old values in rlc. */
rlc[1]=realcoords[TabNum][1];
}
if (logxy[TabNum][1]) {
rlc[2]=log(realcoords[TabNum][2]); /* If y axis is logarithmic, store */
rlc[3]=log(realcoords[TabNum][3]); /* recalculated values in rlc. */
}
else {
rlc[2]=realcoords[TabNum][2]; /* Else store old values in rlc. */
rlc[3]=realcoords[TabNum][3];
}
alpha=((axiscoords[TabNum][0][0]-(double) Xpos)
-(axiscoords[TabNum][0][1]-(double) Ypos)*(x43/y43))/(x21-((y21*x43)/y43));
beta=((axiscoords[TabNum][2][1]-(double) Ypos)
-(axiscoords[TabNum][2][0]-(double) Xpos)*(y21/x21))/(y43-((x43*y21)/x21));
if (logxy[TabNum][0]) PV.Xv = exp(-alpha*(rlc[1]-rlc[0])+rlc[0]);
else PV.Xv = -alpha*(rlc[1]-rlc[0])+rlc[0];
if (logxy[TabNum][1]) PV.Yv = exp(-beta*(rlc[3]-rlc[2])+rlc[2]);
else PV.Yv = -beta*(rlc[3]-rlc[2])+rlc[2];
alpha=((axiscoords[TabNum][0][0]-(double) (Xpos+1))
-(axiscoords[TabNum][0][1]-(double) (Ypos+1))*(x43/y43))/(x21-((y21*x43)/y43));
beta=((axiscoords[TabNum][2][1]-(double) (Ypos+1))
-(axiscoords[TabNum][2][0]-(double) (Xpos+1))*(y21/x21))/(y43-((x43*y21)/x21));
if (logxy[TabNum][0]) PV.Xerr = exp(-alpha*(rlc[1]-rlc[0])+rlc[0]);
else PV.Xerr = -alpha*(rlc[1]-rlc[0])+rlc[0];
if (logxy[TabNum][1]) PV.Yerr = exp(-beta*(rlc[3]-rlc[2])+rlc[2]);
else PV.Yerr = -beta*(rlc[3]-rlc[2])+rlc[2];
alpha=((axiscoords[TabNum][0][0]-(double) (Xpos-1))
-(axiscoords[TabNum][0][1]-(double) (Ypos-1))*(x43/y43))/(x21-((y21*x43)/y43));
beta=((axiscoords[TabNum][2][1]-(double) (Ypos-1))
-(axiscoords[TabNum][2][0]-(double) (Xpos-1))*(y21/x21))/(y43-((x43*y21)/x21));
if (logxy[TabNum][0]) PV.Xerr -= exp(-alpha*(rlc[1]-rlc[0])+rlc[0]);
else PV.Xerr -= -alpha*(rlc[1]-rlc[0])+rlc[0];
if (logxy[TabNum][1]) PV.Yerr -= exp(-beta*(rlc[3]-rlc[2])+rlc[2]);
else PV.Yerr -= -beta*(rlc[3]-rlc[2])+rlc[2];
PV.Xerr = fabs(PV.Xerr/4.0);
PV.Yerr = fabs(PV.Yerr/4.0);
return PV;
}
/****************************************************************/
/* This function is called when the "Print results" button is */
/* pressed, it calculate the values of the datapoints and */
/* prints them through stdout. */
/****************************************************************/
void print_results(GtkWidget *widget, gpointer func_data)
{
gint i; /* Declare index variable */
gboolean print2file;
FILE *FP;
struct PointValue *RealPos, CalcVal;
print2file = Action[ViewedTabNum];
if (print2file == PRINT2FILE) {
FP = fopen(file_name[ViewedTabNum],"w"); /* Open file for writing */
if (FP==NULL) {
printf("Could not open %s for writing\n",file_name[ViewedTabNum]); /* If unable to open print error */
return;
}
}
RealPos = (struct PointValue *) malloc(sizeof(struct PointValue) * numpoints[ViewedTabNum]);
/* Next up is recalculating the positions of the points by solving a 2*2 matrix */
for (i=0;i<numpoints[ViewedTabNum];i++) {
CalcVal = CalcPointValue(points[ViewedTabNum][i][0], points[ViewedTabNum][i][1], ViewedTabNum);
RealPos[i].Xv = CalcVal.Xv;
RealPos[i].Yv = CalcVal.Yv;
RealPos[i].Xerr = CalcVal.Xerr;
RealPos[i].Yerr = CalcVal.Yerr;
}
if (ordering[ViewedTabNum] != 0) {
Order(RealPos, 0, numpoints[ViewedTabNum]-1, ordering[ViewedTabNum]);
}
/* Print results to stdout or file */
for (i=0;i<numpoints[ViewedTabNum];i++) {
if (print2file == PRINT2FILE) {
fprintf(FP,"%.12g %.12g", RealPos[i].Xv, RealPos[i].Yv);
if (UseErrors[ViewedTabNum]) {
fprintf(FP,"\t%.12g %.12g\n", RealPos[i].Xerr, RealPos[i].Yerr);
} else fprintf(FP,"\n");
}
else {
printf("%.12g %.12g",RealPos[i].Xv, RealPos[i].Yv);
if (UseErrors[ViewedTabNum]) {
printf("\t%.12g %.12g\n", RealPos[i].Xerr, RealPos[i].Yerr);
} else printf("\n");
}
}
free(RealPos);
if (print2file == PRINT2FILE) fclose(FP);
}
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