134 lines
4.6 KiB
C++
134 lines
4.6 KiB
C++
// Filename: eggTriangleFan.cxx
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// Created by: drose (23Mar05)
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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 "eggTriangleFan.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 EggTriangleFan::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleFan::Destructor
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// Access: Published, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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EggTriangleFan::
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~EggTriangleFan() {
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clear();
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}
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleFan::write
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// Access: Published, Virtual
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// Description: Writes the triangle fan to the indicated output
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// stream in Egg format.
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////////////////////////////////////////////////////////////////////
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void EggTriangleFan::
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write(ostream &out, int indent_level) const {
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write_header(out, indent_level, "<TriangleFan>");
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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: EggTriangleFan::apply_first_attribute
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// Access: Published, Virtual
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// Description: Sets the first vertex of the triangle (or each
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// component) to the primitive normal and/or color, if
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// the primitive is flat-shaded. This reflects the
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// DirectX convention of storing flat-shaded properties
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// on the first vertex, although it is not usually a
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// convention in Egg.
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//
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// This may introduce redundant vertices to the vertex
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// pool.
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////////////////////////////////////////////////////////////////////
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void EggTriangleFan::
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apply_first_attribute() {
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// In the case of a triangle fan, the first vertex of the fan is the
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// common vertex, so we consider the second vertex to be the key
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// vertex of the first triangle, and move from there.
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for (int i = 0; i < get_num_components(); i++) {
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EggAttributes *component = get_component(i);
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do_apply_flat_attribute(i + 1, component);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: EggTriangleFan::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 EggTriangleFan::
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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: EggTriangleFan::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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// fan.
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//
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// It is assumed that the EggTriangleFan 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 EggTriangleFan::
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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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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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poly->add_vertex(v0);
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poly->add_vertex(v1);
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poly->add_vertex(*vi);
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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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