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// computes bbox of an OFF object.
#include <CGAL/Bbox_3.h>
#include <CGAL/IO/Verbose_ostream.h>
#include <CGAL/IO/OFF.h>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <fstream>
#include <cfloat>
using namespace std;
bool verbose = false;
bool unitcube = false;
// main function with standard unix commandline arguments
// ------------------------------------------------------
int main( int argc, char **argv)
{
int n = 0; // number of filenames
char *filename[1] = { NULL }; // stop compiler warning (too hard to rewrite the code to avoid it)
bool help = false;
for (int i = 1; i < argc; i++) { // check commandline options
if ( strcmp( "-v", argv[i]) == 0)
verbose = true;
else if ( strcmp( "-unit", argv[i]) == 0)
unitcube = true;
else if ( (strcmp( "-h", argv[i]) == 0) ||
(strcmp( "-help", argv[i]) == 0))
help = true;
else if ( n < 1 ) {
filename[ n++] = argv[i];
} else {
n++;
break;
}
}
if ((n > 1) || help) {
if ( ! help)
cerr << "Error: in parameter list" << endl;
cerr << "Usage: " << argv[0] << " [<options>] [<infile> [<outfile>]]"
<< endl;
cerr << "Usage: " << argv[0] << " [<options>] [<infile>]" << endl;
cerr << " computes the bbox of the coordinates of an OFF object."
<< endl;
cerr << " -unit prints transformation to unit cube." << endl;
cerr << " (can be used with 'off_transform')" << endl;
cerr << " -v verbose." << endl;
exit( ! help);
}
CGAL::Verbose_ostream verr( verbose);
verr << argv[0] << ": verbosity on." << endl;
const char* name = "cin";
istream* p_in = &cin;
ifstream in;
if ( n > 0) {
in.open( filename[0]);
p_in = ∈
name = filename[0];
}
if ( ! * p_in) {
cerr << argv[0] << ": error: cannot open file '"<< name
<< "' for reading." <<endl;
exit( 1);
}
verr << "CGAL::File_scanner_OFF( " << name << ") ...." << endl;
CGAL::File_scanner_OFF scanner( * p_in);
if ( ! * p_in) {
cerr << argv[0] << ": error: file '"<< name
<< "' is not in OFF format." << endl;
std::abort();
}
if ( scanner.size_of_vertices() <= 0) {
cerr << argv[0] << ": error: file '"<< name
<< "' has no vertices." << endl;
std::abort();
}
size_t v = scanner.size_of_vertices();
CGAL::Bbox_3 bbox;
double x, y, z;
scanner.scan_vertex( x, y, z);
bbox = CGAL::Bbox_3( x,y,z, x,y,z);
v--;
while (v--) {
scanner.scan_vertex( x, y, z);
bbox = bbox + CGAL::Bbox_3( x,y,z, x,y,z);
scanner.skip_to_next_vertex( scanner.size_of_vertices() - v - 1);
}
verr << ".... done." << scanner.size_of_vertices() << " points read."
<< endl;
if ( !in) {
cerr << argv[0] << " read error: while reading file '"<< name << "'."
<< endl;
exit( 1);
}
if ( ! unitcube) {
cout << bbox.xmin() << " " << bbox.ymin() << " " << bbox.zmin()
<< '\n';
cout << bbox.xmax() << " " << bbox.ymax() << " " << bbox.zmax()
<< endl;
} else {
double s = DBL_MAX;
double d = bbox.xmax() - bbox.xmin();
if ( d > 0 && 2/d < s)
s = 2/d;
d = bbox.ymax() - bbox.ymin();
if ( d > 0 && 2/d < s)
s = 2/d;
d = bbox.zmax() - bbox.zmin();
if ( d > 0 && 2/d < s)
s = 2/d;
if ( s == DBL_MAX)
s = 1;
cout << "-trans " << (-(bbox.xmin() + bbox.xmax())/2)
<< " " << (-(bbox.ymin() + bbox.ymax())/2)
<< " " << (-(bbox.zmin() + bbox.zmax())/2)
<< " -scale " << s << endl;
}
return 0;
}
// EOF //
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