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Diffstat (limited to 'engines/sword25/math/vertex.h')
| -rw-r--r-- | engines/sword25/math/vertex.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/engines/sword25/math/vertex.h b/engines/sword25/math/vertex.h new file mode 100644 index 0000000000..87e4694d48 --- /dev/null +++ b/engines/sword25/math/vertex.h @@ -0,0 +1,180 @@ +/* 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" + +namespace Lua { + +// Forward declarations +struct lua_State; + +} + +using namespace Lua; + +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 |