115 lines
3.6 KiB
C++
115 lines
3.6 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) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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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 "indent.h"
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TypeHandle EggTriangleStrip::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleStrip::Destructor
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// Access: Published, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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EggTriangleStrip::
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~EggTriangleStrip() {
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clear();
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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::get_num_lead_vertices
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// Access: Protected, Virtual
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// Description: Returns the number of initial vertices that are not
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// used in defining any component; the first component
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// is defined by the (n + 1)th vertex, and then a new
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// component at each vertex thereafter.
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////////////////////////////////////////////////////////////////////
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int EggTriangleStrip::
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get_num_lead_vertices() const {
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return 2;
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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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// Returns true if the triangulation is successful, or
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// false if there was some error (in which case the
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// container may contain some partial triangulation).
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////////////////////////////////////////////////////////////////////
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bool EggTriangleStrip::
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do_triangulate(EggGroupNode *container) const {
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if (size() < 3) {
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return false;
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}
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const_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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return true;
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}
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