Remove unused convex_hull.hxx / .cxx, now that we can expand polys
using the clipper library
This commit is contained in:
Peter Sadrozinski
Christian Schmitt
parent
97aac36c39
commit
474c126a0c
4 changed files with 0 additions and 301 deletions
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@ -4,7 +4,6 @@ add_executable(genapts850
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apt_surface.hxx apt_surface.cxx
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beznode.hxx
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closedpoly.hxx closedpoly.cxx
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convex_hull.hxx convex_hull.cxx
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elevations.cxx elevations.hxx
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global.hxx
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helipad.hxx helipad.cxx
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@ -9,7 +9,6 @@
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#include <Geometry/poly_support.hxx>
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#include "beznode.hxx"
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#include "convex_hull.hxx"
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#include "closedpoly.hxx"
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#define NO_BEZIER (0)
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@ -1,252 +0,0 @@
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// convex_hull.cxx -- calculate the convex hull of a set of points
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//
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// Written by Curtis Olson, started September 1998.
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//
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// Copyright (C) 1998 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id: convex_hull.cxx,v 1.12 2004-11-19 22:25:49 curt Exp $
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//
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <math.h>
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#include <stdio.h>
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#include <map>
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#include <simgear/compiler.h>
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#include <simgear/constants.h>
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#include <simgear/structure/exception.hxx>
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#include <simgear/constants.h>
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#include "convex_hull.hxx"
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#include "point2d.hxx"
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using std::less;
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using std::map;
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// stl map typedefs
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typedef map < double, double, less<double> > map_container;
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typedef map_container::iterator map_iterator;
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// Calculate theta of angle (a, b, c)
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double calc_angle(Point3D a, Point3D b, Point3D c) {
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Point3D u, v;
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double udist, vdist, uv_dot, tmp;
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// u . v = ||u|| * ||v|| * cos(theta)
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u.setx( b.x() - a.x() );
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u.sety( b.y() - a.y() );
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udist = sqrt( u.x() * u.x() + u.y() * u.y() );
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// printf("udist = %.6f\n", udist);
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v.setx( b.x() - c.x() );
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v.sety( b.y() - c.y() );
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vdist = sqrt( v.x() * v.x() + v.y() * v.y() );
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// printf("vdist = %.6f\n", vdist);
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uv_dot = u.x() * v.x() + u.y() * v.y();
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// printf("uv_dot = %.6f\n", uv_dot);
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tmp = uv_dot / (udist * vdist);
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// printf("tmp = %.6f\n", tmp);
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return acos(tmp);
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}
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// Test to see if angle(Pa, Pb, Pc) < 180 degrees
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bool test_point(Point3D Pa, Point3D Pb, Point3D Pc) {
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double a1, a2;
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Point3D origin( 0.0 );
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Point3D a( cos(Pa.y()) * Pa.x(),
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sin(Pa.y()) * Pa.x(), 0 );
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Point3D b( cos(Pb.y()) * Pb.x(),
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sin(Pb.y()) * Pb.x(), 0 );
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Point3D c( cos(Pc.y()) * Pc.x(),
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sin(Pc.y()) * Pc.x(), 0 );
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// printf("a is %.6f %.6f\n", a.x, a.y);
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// printf("b is %.6f %.6f\n", b.x, b.y);
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// printf("c is %.6f %.6f\n", c.x, c.y);
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a1 = calc_angle(a, b, origin);
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a2 = calc_angle(origin, b, c);
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// printf("a1 = %.2f a2 = %.2f\n", a1 * SGD_RADIANS_TO_DEGREES, a2 * SGD_RADIANS_TO_DEGREES);
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return ( (a1 + a2) < SGD_PI );
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}
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// calculate the convex hull of a set of points, return as a list of
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// point2d. The algorithm description can be found at:
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// http://riot.ieor.berkeley.edu/riot/Applications/ConvexHull/CHDetails.html
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TGPolygon convex_hull( const point_list& input_list ) {
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int i;
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map_iterator map_current, map_next, map_next_next, map_last;
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// list of translated points
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point_list trans_list;
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// points sorted by radian degrees
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map_container radians_map;
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// will contain the convex hull
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TGPolygon con_hull;
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Point3D p, Pa, Pb, Pc, result;
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double sum_x, sum_y;
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int in_count, last_size;
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// STEP ONE: Find an average midpoint of the input set of points
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in_count = input_list.size();
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sum_x = sum_y = 0.0;
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for ( i = 0; i < in_count; ++i ) {
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sum_x += input_list[i].x();
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sum_y += input_list[i].y();
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}
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Point3D average( sum_x / in_count, sum_y / in_count, 0 );
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// printf("Average center point is %.4f %.4f\n", average.x, average.y);
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// STEP TWO: Translate input points so average is at origin
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trans_list.clear();
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for ( i = 0; i < in_count; ++i ) {
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p = Point3D( input_list[i].x() - average.x(),
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input_list[i].y() - average.y(), 0 );
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// printf("%.6f %.6f\n", p.x, p.y);
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trans_list.push_back( p );
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}
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// STEP THREE: convert to radians and sort by theta
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radians_map.clear();
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for ( i = 0; i < in_count; ++i ) {
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p = cart_to_polar_2d( trans_list[i] );
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if ( p.x() > radians_map[p.y()] ) {
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radians_map[p.y()] = p.x();
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}
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}
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/*
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// printf("Sorted list\n");
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map_current = radians_map.begin();
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map_last = radians_map.end();
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for ( ; map_current != map_last ; ++map_current ) {
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p.setx( (*map_current).first );
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p.sety( (*map_current).second );
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printf("p is %.6f %.6f\n", p.x(), p.y());
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}
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*/
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// STEP FOUR: traverse the sorted list and eliminate everything
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// not on the perimeter.
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// printf("Traversing list\n");
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// double check list size ... this should never fail because a
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// single runway will always generate four points.
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if ( radians_map.size() < 3 ) {
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throw sg_exception("convex hull not possible with < 3 points");
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}
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// ensure that we run the while loop at least once
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last_size = radians_map.size() + 1;
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while ( last_size > (int)radians_map.size() ) {
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// printf("Running an iteration of the graham scan algorithm\n");
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last_size = radians_map.size();
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map_current = radians_map.begin();
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while ( map_current != radians_map.end() ) {
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// get first element
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Pa.sety( (*map_current).first );
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Pa.setx( (*map_current).second );
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// get second element
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map_next = map_current;
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++map_next;
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if ( map_next == radians_map.end() ) {
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map_next = radians_map.begin();
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}
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Pb.sety( (*map_next).first );
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Pb.setx( (*map_next).second );
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// get third element
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map_next_next = map_next;
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++map_next_next;
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if ( map_next_next == radians_map.end() ) {
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map_next_next = radians_map.begin();
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}
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Pc.sety( (*map_next_next).first );
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Pc.setx( (*map_next_next).second );
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// printf("Pa is %.6f %.6f\n", Pa.y(), Pa.x());
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// printf("Pb is %.6f %.6f\n", Pb.y(), Pb.x());
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// printf("Pc is %.6f %.6f\n", Pc.y(), Pc.x());
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if ( test_point(Pa, Pb, Pc) ) {
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// printf("Accepted a point\n");
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// accept point, advance Pa, Pb, and Pc.
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++map_current;
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} else {
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// printf("REJECTED A POINT\n");
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// reject point, delete it and advance only Pb and Pc
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map_next = map_current;
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++map_next;
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if ( map_next == radians_map.end() ) {
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map_next = radians_map.begin();
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}
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radians_map.erase( map_next );
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}
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}
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}
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// translate back to correct lon/lat
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// printf("Final sorted convex hull\n");
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con_hull.erase();
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map_current = radians_map.begin();
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map_last = radians_map.end();
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for ( ; map_current != map_last ; ++map_current ) {
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p.sety( (*map_current).first );
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p.setx( (*map_current).second );
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result.setx( cos(p.y()) * p.x() + average.x() );
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result.sety( sin(p.y()) * p.x() + average.y() );
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// printf("%.6f %.6f\n", result.x, result.y);
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con_hull.add_node(0, result);
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}
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return con_hull;
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}
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@ -1,47 +0,0 @@
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// convex_hull.hxx -- calculate the convex hull of a set of points
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//
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// Written by Curtis Olson, started September 1998.
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//
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// Copyright (C) 1998 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id: convex_hull.hxx,v 1.5 2004-11-19 22:25:49 curt Exp $
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//
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#ifndef _CONVEX_HULL_HXX
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#define _CONVEX_HULL_HXX
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#include <list>
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#include <simgear/math/sg_types.hxx>
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#include <Polygon/polygon.hxx>
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#include "point2d.hxx"
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// calculate the convex hull of a set of points, return as a list of
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// point2d. The algorithm description can be found at:
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// http://riot.ieor.berkeley.edu/riot/Applications/ConvexHull/CHDetails.html
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TGPolygon convex_hull( const point_list& input_list );
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#endif // _CONVEX_HULL_HXX
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