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/*
*****************************************************
*
* SaVi by Lloyd Wood (lloydwood@users.sourceforge.net),
* Patrick Worfolk (worfolk@alum.mit.edu) and
* Robert Thurman.
*
* Copyright (c) 1997 by The Geometry Center.
* Also Copyright (c) 2017 by Lloyd Wood.
*
* This file is part of SaVi. SaVi is free software;
* you can redistribute it and/or modify it only under
* the terms given in the file COPYRIGHT which you should
* have received along with this file. SaVi may be
* obtained from:
* http://savi.sourceforge.net/
* http://www.geom.uiuc.edu/locate/SaVi
*
*****************************************************
*
* utils.c
*
* $Id: utils.c,v 1.21 2017/01/02 06:11:32 lloydwood Exp $
*/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
/* for select */
#include <unistd.h>
#include <sys/time.h>
#include "constants.h"
#include "globals.h"
#include "utils.h"
/*
* copyfile(stdout, "data.txt")
*
* Will copy the file data.txt to stdout.
* Returns TRUE if successful, else FALSE.
*/
unsigned int
copyfile(FILE * out_fp, const char filename[])
{
FILE *in_fp;
char buf[LENGTH_STRING_BUFFER];
if (!out_fp)
return FALSE;
if (NULL == (in_fp = fopen(filename, "r")))
return FALSE;
while (fgets(buf, LENGTH_STRING_BUFFER, in_fp)) {
fprintf(out_fp, "%s", buf);
}
fflush(out_fp);
fclose(in_fp);
return TRUE;
}
/*
* forward over comments and any newlines and white space
*
*/
void
forward_over_comments(FILE * fp)
{
int c = getc(fp);
while ((c == '\n') || (c == ' ') || (c == '\t') || (c == '#')) {
if (c == '#') {
/* skip to end of line */
do {
c = getc(fp);
} while ((c != '\n') && (c != EOF));
}
c = getc(fp);
}
ungetc(c, fp);
}
/*
* identity
*
* Fills in a 4x4 matrix to be the identity matrix
*/
void
identity(double m[4][4])
{
unsigned int i, j;
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++)
m[i][j] = ((i == j) ? 1.0 : 0.0);
}
/*
* Return the norm of a CartesianCoordinate vector
*/
double
norm(const CartesianCoordinates * px)
{
return (sqrt(px->x * px->x + px->y * px->y + px->z * px->z));
}
/*
* Normalizes a CartesianCoordinate vector to unit length
*/
void
normalize(CartesianCoordinates * px)
{
double l = norm(px);
if (l == 0.0)
return;
px->x /= l;
px->y /= l;
px->z /= l;
}
/*
* Return the dot-product of two CartesianCoordinate vectors.
*/
double
dot(const CartesianCoordinates * px, const CartesianCoordinates * py)
{
return (px->x * py->x + px->y * py->y + px->z * py->z);
}
/*
* The vector cross-product of two CartesianCoordinate vectors
*/
void
cross_product(CartesianCoordinates * pucv, const CartesianCoordinates * pu,
const CartesianCoordinates * pv)
{
double pu_x = pu->x;
double pu_y = pu->y;
double pu_z = pu->z;
double pv_x = pv->x;
double pv_y = pv->y;
double pv_z = pv->z;
pucv->x = (pu_y * pv_z - pu_z * pv_y);
pucv->y = (pu_z * pv_x - pu_x * pv_z);
pucv->z = (pu_x * pv_y - pu_y * pv_x);
}
void
print_vec(const char msg[], const CartesianCoordinates * pv)
{
fprintf(stderr, "%s = (%f,%f,%f)\n", msg, pv->x, pv->y, pv->z);
}
/*
* Rotate a vector by angle theta about the z-axis.
*
* The rotation matrix is
*
* cos(theta) -sin(theta) 0
* sin(theta) cos(theta) 0
* 0 0 1
*
*/
void
rotate_z(const CartesianCoordinates * v_old, const double theta,
CartesianCoordinates * v_new)
{
double cos_theta = cos(theta);
double sin_theta = sin(theta);
double old_x = v_old->x;
double old_y = v_old->y;
v_new->x = cos_theta * old_x - sin_theta * old_y;
v_new->y = sin_theta * old_x + cos_theta * old_y;
v_new->z = v_old->z;
}
/*
* error_format
*
* prints a string using formatting to stderr
* - a newline is automatically appended
*/
void
error_format(const char format[], const char msg[])
{
fprintf(stderr, "\nSaVi: ");
fprintf(stderr, format, msg);
}
/*
* error_and_exit
*
* prints an error msg and exits program with value 1
*/
void
error_and_exit(const char msg[])
{
error_format("%s", msg);
error_format("%s", "Error! Exiting.");
exit(1);
}
/*
* error
*
* prints a string as an error message
*/
void
error(const char msg[])
{
error_format("%s", msg);
}
void
millisleep(const unsigned int ms)
{
struct timeval tv;
tv.tv_usec = (ms % 1000) * 1000;
tv.tv_sec = ms / 1000;
select(0, NULL, NULL, NULL, &tv);
}
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