108 lines
2.5 KiB
C++
108 lines
2.5 KiB
C++
/**
|
|
* PANDA 3D SOFTWARE
|
|
* Copyright (c) Carnegie Mellon University. All rights reserved.
|
|
*
|
|
* All use of this software is subject to the terms of the revised BSD
|
|
* license. You should have received a copy of this license along
|
|
* with this source code in a file named "LICENSE."
|
|
*
|
|
* @file eggTriangleStrip.cxx
|
|
* @author drose
|
|
* @date 2005-03-13
|
|
*/
|
|
|
|
#include "eggTriangleStrip.h"
|
|
#include "eggGroupNode.h"
|
|
#include "eggPolygon.h"
|
|
#include "indent.h"
|
|
|
|
TypeHandle EggTriangleStrip::_type_handle;
|
|
|
|
/**
|
|
*
|
|
*/
|
|
EggTriangleStrip::
|
|
~EggTriangleStrip() {
|
|
clear();
|
|
}
|
|
|
|
/**
|
|
* Makes a copy of this object.
|
|
*/
|
|
EggTriangleStrip *EggTriangleStrip::
|
|
make_copy() const {
|
|
return new EggTriangleStrip(*this);
|
|
}
|
|
|
|
/**
|
|
* Writes the triangle strip to the indicated output stream in Egg format.
|
|
*/
|
|
void EggTriangleStrip::
|
|
write(std::ostream &out, int indent_level) const {
|
|
write_header(out, indent_level, "<TriangleStrip>");
|
|
write_body(out, indent_level+2);
|
|
indent(out, indent_level) << "}\n";
|
|
}
|
|
|
|
/**
|
|
* Returns the number of initial vertices that are not used in defining any
|
|
* component; the first component is defined by the (n + 1)th vertex, and then
|
|
* a new component at each vertex thereafter.
|
|
*/
|
|
int EggTriangleStrip::
|
|
get_num_lead_vertices() const {
|
|
return 2;
|
|
}
|
|
|
|
/**
|
|
* Fills the container up with EggPolygons that represent the component
|
|
* triangles of this triangle strip.
|
|
*
|
|
* It is assumed that the EggTriangleStrip is not already a child of any other
|
|
* group when this function is called.
|
|
*
|
|
* Returns true if the triangulation is successful, or false if there was some
|
|
* error (in which case the container may contain some partial triangulation).
|
|
*/
|
|
bool EggTriangleStrip::
|
|
do_triangulate(EggGroupNode *container) const {
|
|
if (size() < 3) {
|
|
return false;
|
|
}
|
|
const_iterator vi = begin();
|
|
EggVertex *v0 = (*vi);
|
|
++vi;
|
|
EggVertex *v1 = (*vi);
|
|
++vi;
|
|
bool reversed = false;
|
|
|
|
for (int i = 0; i < (int)size() - 2; i++) {
|
|
PT(EggPolygon) poly = new EggPolygon;
|
|
poly->copy_attributes(*this);
|
|
const EggAttributes *attrib = get_component(i);
|
|
if (attrib->has_color()) {
|
|
poly->set_color(attrib->get_color());
|
|
}
|
|
if (attrib->has_normal()) {
|
|
poly->set_normal(attrib->get_normal());
|
|
}
|
|
|
|
if (reversed) {
|
|
poly->add_vertex(v1);
|
|
poly->add_vertex(v0);
|
|
reversed = false;
|
|
} else {
|
|
poly->add_vertex(v0);
|
|
poly->add_vertex(v1);
|
|
reversed = true;
|
|
}
|
|
poly->add_vertex(*vi);
|
|
v0 = v1;
|
|
v1 = *vi;
|
|
container->add_child(poly);
|
|
++vi;
|
|
}
|
|
|
|
return true;
|
|
}
|