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- /*
- * polygon.h
- * Copyright (C) Andrew Tridgell 2011
- *
- * This file is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This file is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #pragma once
- #include "vector2.h"
- template <typename T>
- bool Polygon_outside(const Vector2<T> &P, const Vector2<T> *V, unsigned n) WARN_IF_UNUSED;
- template <typename T>
- bool Polygon_complete(const Vector2<T> *V, unsigned n) WARN_IF_UNUSED;
- /*
- determine if the polygon of N verticies defined by points V is
- intersected by a line from point p1 to point p2
- intersection argument returns the intersection closest to p1
- */
- bool Polygon_intersects(const Vector2f *V, unsigned N, const Vector2f &p1, const Vector2f &p2, Vector2f &intersection) WARN_IF_UNUSED;
- /*
- return the closest distance that a line from p1 to p2 comes to an
- edge of closed polygon V, defined by N points
- negative numbers indicate the line cross into the polygon with the negative size being the distance from p2 to the intersection point closest to p1
- */
- float Polygon_closest_distance_line(const Vector2f *V, unsigned N, const Vector2f &p1, const Vector2f &p2);
- /*
- return the closest distance that a point p comes to an edge of
- closed polygon V, defined by N points
- */
- float Polygon_closest_distance_point(const Vector2f *V, unsigned N, const Vector2f &p);
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