108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
// Filename: eggTriangleStrip.cxx
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// Created by: drose (13Mar05)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "eggTriangleStrip.h"
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#include "eggGroupNode.h"
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#include "eggPolygon.h"
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#include "plane.h"
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#include "indent.h"
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#include <algorithm>
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TypeHandle EggTriangleStrip::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleStrip::cleanup
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// Access: Published, Virtual
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// Description: Cleans up modeling errors in whatever context this
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// makes sense. For instance, for a polygon, this calls
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// remove_doubled_verts(true). For a point, it calls
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// remove_nonunique_verts(). Returns true if the
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// primitive is valid, or false if it is degenerate.
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////////////////////////////////////////////////////////////////////
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bool EggTriangleStrip::
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cleanup() {
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return size() >= 3;
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}
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleStrip::write
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// Access: Published, Virtual
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// Description: Writes the triangle strip to the indicated output
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// stream in Egg format.
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////////////////////////////////////////////////////////////////////
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void EggTriangleStrip::
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write(ostream &out, int indent_level) const {
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write_header(out, indent_level, "<TriangleStrip>");
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write_body(out, indent_level+2);
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indent(out, indent_level) << "}\n";
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}
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleStrip::triangulate_poly
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// Access: Protected, Virtual
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// Description: Fills the container up with EggPolygons that
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// represent the component triangles of this triangle
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// strip.
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//
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// It is assumed that the EggTriangleStrip is not
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// already a child of any other group when this function
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// is called.
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////////////////////////////////////////////////////////////////////
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void EggTriangleStrip::
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do_triangulate(EggGroupNode *container) {
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if (size() < 3) {
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return;
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}
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iterator vi = begin();
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EggVertex *v0 = (*vi);
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++vi;
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EggVertex *v1 = (*vi);
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++vi;
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bool reversed = false;
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for (int i = 0; i < (int)size() - 2; i++) {
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PT(EggPolygon) poly = new EggPolygon;
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poly->copy_attributes(*this);
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const EggAttributes *attrib = get_component(i);
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if (attrib->has_color()) {
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poly->set_color(attrib->get_color());
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}
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if (attrib->has_normal()) {
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poly->set_normal(attrib->get_normal());
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}
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if (reversed) {
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poly->add_vertex(v1);
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poly->add_vertex(v0);
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reversed = false;
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} else {
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poly->add_vertex(v0);
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poly->add_vertex(v1);
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reversed = true;
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}
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poly->add_vertex(*vi);
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v0 = v1;
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v1 = *vi;
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container->add_child(poly);
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++vi;
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}
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}
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