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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
/*
BS_Vertex
---------
Autor: Malte Thiesen
*/
#ifndef SWORD25_VERTEX_H
#define SWORD25_VERTEX_H
// Includes
#include <math.h>
#include "sword25/kernel/common.h"
#include "sword25/util/lua/lua.h"
#if defined(MACOSX) || defined(SOLARIS) || defined(__MINGW32__)
// Older versions of Mac OS X didn't supply a powf function, so using it
// will cause a binary incompatibility when trying to run a binary built
// on a newer OS X release on an olderr one. And Solaris 8 doesn't provide
// powf, floorf, fabsf etc. at all.
// Cross-compiled MinGW32 toolchains suffer from a cross-compile bug in
// libstdc++. math/stubs.o should be empty, but it comes with a symbol for
// powf, resulting in a linker error because of multiple definitions.
// Hence we re-define them here. The only potential drawback is that it
// might be a little bit slower this way.
#define powf(x,y) ((float)pow(x,y))
#define floorf(x) ((float)floor(x))
#define fabsf(x) ((float)fabs(x))
#define sqrtf(x) ((float)sqrt(x))
#define atan2f(x,y) ((float)atan2(x,y))
#endif
namespace Sword25 {
/**
* Defines a 2-D Vertex
*/
class Vertex {
public:
Vertex() : x(0), y(0) {}
Vertex(int x_, int y_) {
this->x = x_;
this->y = y_;
}
int x;
int y;
/**
* Compares two Vertecies.
*/
inline bool operator==(const Vertex &rhs) const {
if (x == rhs.x && y == rhs.y) return true;
return false;
}
/**
* Compares two Vertecies.
*/
inline bool operator!=(const Vertex &rhs) const {
if (x != rhs.x || y != rhs.y) return true;
return false;
}
/**
* Adds a vertex to vertex
*/
inline void operator+=(const Vertex &delta) {
x += delta.x;
y += delta.y;
}
/**
* Subtracts a vertex from a vertex
*/
inline void operator-=(const Vertex &delta) {
x -= delta.x;
y -= delta.y;
}
/**
* Adds two vertecies
*/
inline Vertex operator+(const Vertex &delta) const {
return Vertex(x + delta.x, y + delta.y);
}
/**
* Subtracts two vertecies
*/
inline Vertex operator-(const Vertex &delta) const {
return Vertex(x - delta.x, y - delta.y);
}
/**
* Calculates the square of the distance between two Vertecies.
* @param Vertex The vertex for which the distance is to be calculated
* @return Returns the square of the distance between itself and the passed vertex
* @remark If only distances should be compared, this method should be used because
* it is faster than Distance()
*/
inline int distance2(const Vertex &vertex) const {
return (x - vertex.x) * (x - vertex.x) + (y - vertex.y) * (y - vertex.y);
}
/**
* Calculates the square of the distance between two Vertecies.
* @param Vertex The vertex for which the distance is to be calculated
* @return Returns the square of the distance between itself and the passed vertex
* @remark If only distances should be compared, Distance2() should be used, since it is faster.
*/
inline int distance(const Vertex &vertex) const {
return (int)(sqrtf(static_cast<float>(distance2(vertex))) + 0.5);
}
/**
* Calculates the cross product of the vertex with another vertex. Here the Vertecies will be
* interpreted as vectors.
* @param Vertex The second vertex
* @return Returns the cross product of this vertex and the passed vertex.
*/
inline int computeCrossProduct(const Vertex &vertex) const {
return x * vertex.y - vertex.x * y;
}
/**
* Returns the dot product of this vertex with another vertex. Here the Vertecies are interpreted as vectors.
* @param Vertex The second vertex
* @return Returns the dot product of this vertex and the passed vertex.
*/
inline int computeDotProduct(const Vertex &vertex) const {
return x * vertex.x + y * vertex.y;
}
/**
* Calculates the angle between this vertex and another vertex. Here the Vertecies are interpreted as vectors.
* @param Vertex The second vertex
* @return Returns the angle between this vertex and the passed vertex in radians.
*/
inline float computeAngle(const Vertex &vertex) const {
return atan2f(static_cast<float>(computeCrossProduct(vertex)), static_cast<float>(computeDotProduct(vertex)));
}
/**
* Calculates the length of the vector
*/
inline float computeLength() const {
return sqrtf(static_cast<float>(x * x + y * y));
}
static Vertex &luaVertexToVertex(lua_State *L, int StackIndex, Vertex &vertex);
static void vertexToLuaVertex(lua_State *L, const Vertex &vertex);
};
} // End of namespace Sword25
#endif
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