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