Panda3D
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collisionLine.cxx
00001 // Filename: collisionLine.cxx
00002 // Created by:  drose (05Jan05)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #include "collisionLine.h"
00016 #include "collisionHandler.h"
00017 #include "collisionEntry.h"
00018 #include "config_collide.h"
00019 #include "geom.h"
00020 #include "geomNode.h"
00021 #include "boundingLine.h"
00022 #include "lensNode.h"
00023 #include "lens.h"
00024 #include "datagram.h"
00025 #include "datagramIterator.h"
00026 #include "bamReader.h"
00027 #include "bamWriter.h"
00028 #include "geom.h"
00029 #include "geomLinestrips.h"
00030 #include "geomVertexWriter.h"
00031 
00032 TypeHandle CollisionLine::_type_handle;
00033 
00034 
00035 ////////////////////////////////////////////////////////////////////
00036 //     Function: CollisionLine::make_copy
00037 //       Access: Public, Virtual
00038 //  Description:
00039 ////////////////////////////////////////////////////////////////////
00040 CollisionSolid *CollisionLine::
00041 make_copy() {
00042   return new CollisionLine(*this);
00043 }
00044 
00045 ////////////////////////////////////////////////////////////////////
00046 //     Function: CollisionLine::test_intersection
00047 //       Access: Public, Virtual
00048 //  Description:
00049 ////////////////////////////////////////////////////////////////////
00050 PT(CollisionEntry) CollisionLine::
00051 test_intersection(const CollisionEntry &entry) const {
00052   return entry.get_into()->test_intersection_from_line(entry);
00053 }
00054 
00055 ////////////////////////////////////////////////////////////////////
00056 //     Function: CollisionLine::output
00057 //       Access: Public, Virtual
00058 //  Description:
00059 ////////////////////////////////////////////////////////////////////
00060 void CollisionLine::
00061 output(ostream &out) const {
00062   out << "line, o (" << get_origin() << "), d (" << get_direction() << ")";
00063 }
00064 
00065 ////////////////////////////////////////////////////////////////////
00066 //     Function: CollisionLine::fill_viz_geom
00067 //       Access: Protected, Virtual
00068 //  Description: Fills the _viz_geom GeomNode up with Geoms suitable
00069 //               for rendering this solid.
00070 ////////////////////////////////////////////////////////////////////
00071 void CollisionLine::
00072 fill_viz_geom() {
00073   if (collide_cat.is_debug()) {
00074     collide_cat.debug()
00075       << "Recomputing viz for " << *this << "\n";
00076   }
00077 
00078   static const int num_points = 100;
00079   static const double scale = 100.0;
00080 
00081   PT(GeomVertexData) vdata = new GeomVertexData
00082     ("collision", GeomVertexFormat::get_v3cp(),
00083      Geom::UH_static);
00084   GeomVertexWriter vertex(vdata, InternalName::get_vertex());
00085   GeomVertexWriter color(vdata, InternalName::get_color());
00086   
00087   for (int i = 0; i < num_points; i++) {
00088     double t = ((double)i / (double)num_points - 0.5) * 2.0;
00089     vertex.add_data3(get_origin() + t * scale * get_direction());
00090     
00091     color.add_data4(LColor(1.0f, 1.0f, 1.0f, 1.0f) +
00092                     fabs(t) * LColor(0.0f, 0.0f, 0.0f, -1.0f));
00093   }
00094   
00095   PT(GeomLinestrips) line = new GeomLinestrips(Geom::UH_static);
00096   line->add_next_vertices(num_points);
00097   line->close_primitive();
00098   
00099   PT(Geom) geom = new Geom(vdata);
00100   geom->add_primitive(line);
00101   
00102   _viz_geom->add_geom(geom, get_other_viz_state());
00103   _bounds_viz_geom->add_geom(geom, get_other_bounds_viz_state());
00104 }
00105 
00106 ////////////////////////////////////////////////////////////////////
00107 //     Function: CollisionLine::register_with_read_factory
00108 //       Access: Public, Static
00109 //  Description: Tells the BamReader how to create objects of type
00110 //               CollisionLine.
00111 ////////////////////////////////////////////////////////////////////
00112 void CollisionLine::
00113 register_with_read_factory() {
00114   BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
00115 }
00116 
00117 ////////////////////////////////////////////////////////////////////
00118 //     Function: CollisionLine::write_datagram
00119 //       Access: Public, Virtual
00120 //  Description: Writes the contents of this object to the datagram
00121 //               for shipping out to a Bam file.
00122 ////////////////////////////////////////////////////////////////////
00123 void CollisionLine::
00124 write_datagram(BamWriter *manager, Datagram &dg) {
00125   CollisionRay::write_datagram(manager, dg);
00126 }
00127 
00128 ////////////////////////////////////////////////////////////////////
00129 //     Function: CollisionLine::make_from_bam
00130 //       Access: Protected, Static
00131 //  Description: This function is called by the BamReader's factory
00132 //               when a new object of type CollisionLine is encountered
00133 //               in the Bam file.  It should create the CollisionLine
00134 //               and extract its information from the file.
00135 ////////////////////////////////////////////////////////////////////
00136 TypedWritable *CollisionLine::
00137 make_from_bam(const FactoryParams &params) {
00138   CollisionLine *node = new CollisionLine();
00139   DatagramIterator scan;
00140   BamReader *manager;
00141 
00142   parse_params(params, scan, manager);
00143   node->fillin(scan, manager);
00144 
00145   return node;
00146 }
00147 
00148 ////////////////////////////////////////////////////////////////////
00149 //     Function: CollisionLine::fillin
00150 //       Access: Protected
00151 //  Description: This internal function is called by make_from_bam to
00152 //               read in all of the relevant data from the BamFile for
00153 //               the new CollisionLine.
00154 ////////////////////////////////////////////////////////////////////
00155 void CollisionLine::
00156 fillin(DatagramIterator &scan, BamReader *manager) {
00157   CollisionRay::fillin(scan, manager);
00158 }
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