1 | /* -*- C++ -*- |
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2 | * src/lemon/xy.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_XY_H |
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18 | #define LEMON_XY_H |
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19 | |
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20 | #include <iostream> |
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21 | |
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22 | ///\ingroup misc |
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23 | ///\file |
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24 | ///\brief A simple two dimensional vector and a bounding box implementation |
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25 | /// |
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26 | /// The class \ref lemon::xy "xy" implements |
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27 | ///a two dimensional vector with the usual |
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28 | /// operations. |
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29 | /// |
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30 | /// The class \ref lemon::BoundingBox "BoundingBox" can be used to determine |
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31 | /// the rectangular bounding box a set of \ref lemon::xy "xy"'s. |
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32 | /// |
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33 | ///\author Attila Bernath |
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34 | |
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35 | |
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36 | namespace lemon { |
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37 | |
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38 | /// \addtogroup misc |
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39 | /// @{ |
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40 | |
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41 | /// A simple two dimensional vector (plainvector) implementation |
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42 | |
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43 | /// A simple two dimensional vector (plainvector) implementation |
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44 | ///with the usual vector |
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45 | /// operators. |
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46 | /// |
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47 | ///\author Attila Bernath |
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48 | template<typename T> |
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49 | class xy { |
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50 | |
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51 | public: |
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52 | |
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53 | typedef T Value; |
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54 | |
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55 | T x,y; |
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56 | |
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57 | ///Default constructor |
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58 | xy() {} |
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59 | |
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60 | ///Constructing the instance from coordinates |
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61 | xy(T a, T b) : x(a), y(b) { } |
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62 | |
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63 | |
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64 | ///Conversion constructor |
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65 | template<class TT> xy(const xy<TT> &p) : x(p.x), y(p.y) {} |
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66 | |
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67 | ///Gives back the square of the norm of the vector |
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68 | T normSquare() const { |
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69 | return x*x+y*y; |
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70 | } |
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71 | |
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72 | ///Increments the left hand side by u |
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73 | xy<T>& operator +=(const xy<T>& u) { |
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74 | x += u.x; |
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75 | y += u.y; |
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76 | return *this; |
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77 | } |
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78 | |
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79 | ///Decrements the left hand side by u |
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80 | xy<T>& operator -=(const xy<T>& u) { |
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81 | x -= u.x; |
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82 | y -= u.y; |
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83 | return *this; |
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84 | } |
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85 | |
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86 | ///Multiplying the left hand side with a scalar |
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87 | xy<T>& operator *=(const T &u) { |
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88 | x *= u; |
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89 | y *= u; |
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90 | return *this; |
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91 | } |
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92 | |
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93 | ///Dividing the left hand side by a scalar |
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94 | xy<T>& operator /=(const T &u) { |
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95 | x /= u; |
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96 | y /= u; |
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97 | return *this; |
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98 | } |
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99 | |
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100 | ///Returns the scalar product of two vectors |
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101 | T operator *(const xy<T>& u) const { |
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102 | return x*u.x+y*u.y; |
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103 | } |
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104 | |
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105 | ///Returns the sum of two vectors |
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106 | xy<T> operator+(const xy<T> &u) const { |
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107 | xy<T> b=*this; |
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108 | return b+=u; |
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109 | } |
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110 | |
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111 | ///Returns the neg of the vectors |
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112 | xy<T> operator-() const { |
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113 | xy<T> b=*this; |
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114 | b.x=-b.x; b.y=-b.y; |
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115 | return b; |
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116 | } |
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117 | |
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118 | ///Returns the difference of two vectors |
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119 | xy<T> operator-(const xy<T> &u) const { |
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120 | xy<T> b=*this; |
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121 | return b-=u; |
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122 | } |
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123 | |
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124 | ///Returns a vector multiplied by a scalar |
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125 | xy<T> operator*(const T &u) const { |
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126 | xy<T> b=*this; |
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127 | return b*=u; |
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128 | } |
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129 | |
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130 | ///Returns a vector divided by a scalar |
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131 | xy<T> operator/(const T &u) const { |
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132 | xy<T> b=*this; |
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133 | return b/=u; |
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134 | } |
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135 | |
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136 | ///Testing equality |
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137 | bool operator==(const xy<T> &u) const { |
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138 | return (x==u.x) && (y==u.y); |
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139 | } |
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140 | |
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141 | ///Testing inequality |
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142 | bool operator!=(xy u) const { |
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143 | return (x!=u.x) || (y!=u.y); |
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144 | } |
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145 | |
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146 | }; |
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147 | |
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148 | ///Returns a vector multiplied by a scalar |
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149 | |
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150 | ///Returns a vector multiplied by a scalar |
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151 | ///\relates xy |
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152 | template<typename T> xy<T> operator*(const T &u,const xy<T> &x) { |
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153 | return x*u; |
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154 | } |
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155 | |
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156 | ///Read a plainvector from a stream |
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157 | |
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158 | ///Read a plainvector from a stream |
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159 | ///\relates xy |
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160 | /// |
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161 | template<typename T> |
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162 | inline |
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163 | std::istream& operator>>(std::istream &is, xy<T> &z) |
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164 | { |
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165 | |
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166 | is >> z.x >> z.y; |
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167 | return is; |
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168 | } |
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169 | |
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170 | ///Write a plainvector to a stream |
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171 | |
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172 | ///Write a plainvector to a stream |
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173 | ///\relates xy |
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174 | /// |
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175 | template<typename T> |
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176 | inline |
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177 | std::ostream& operator<<(std::ostream &os, xy<T> z) |
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178 | { |
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179 | os << "(" << z.x << ", " << z.y << ")"; |
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180 | return os; |
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181 | } |
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182 | |
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183 | ///Rotate by 90 degrees |
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184 | |
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185 | ///Returns its parameter rotated by 90 degrees in positive direction. |
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186 | ///\relates xy |
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187 | /// |
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188 | template<typename T> |
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189 | inline xy<T> rot90(const xy<T> &z) |
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190 | { |
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191 | return xy<T>(-z.y,z.x); |
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192 | } |
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193 | |
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194 | ///Rotate by 270 degrees |
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195 | |
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196 | ///Returns its parameter rotated by 90 degrees in negative direction. |
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197 | ///\relates xy |
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198 | /// |
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199 | template<typename T> |
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200 | inline xy<T> rot270(const xy<T> &z) |
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201 | { |
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202 | return xy<T>(z.y,-z.x); |
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203 | } |
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204 | |
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205 | |
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206 | |
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207 | /// A class to calculate or store the bounding box of plainvectors. |
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208 | |
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209 | /// A class to calculate or store the bounding box of plainvectors. |
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210 | /// |
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211 | ///\author Attila Bernath |
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212 | template<typename T> |
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213 | class BoundingBox { |
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214 | xy<T> bottom_left, top_right; |
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215 | bool _empty; |
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216 | public: |
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217 | |
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218 | ///Default constructor: an empty bounding box |
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219 | BoundingBox() { _empty = true; } |
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220 | |
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221 | ///Constructing the instance from one point |
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222 | BoundingBox(xy<T> a) { bottom_left=top_right=a; _empty = false; } |
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223 | |
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224 | ///Is there any point added |
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225 | bool empty() const { |
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226 | return _empty; |
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227 | } |
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228 | |
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229 | ///Makes the BoundingBox empty |
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230 | void clear() { |
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231 | _empty=1; |
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232 | } |
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233 | |
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234 | ///Gives back the bottom left corner (if the bounding box is empty, then the return value is not defined) |
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235 | xy<T> bottomLeft() const { |
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236 | return bottom_left; |
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237 | } |
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238 | |
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239 | ///Gives back the top right corner (if the bounding box is empty, then the return value is not defined) |
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240 | xy<T> topRight() const { |
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241 | return top_right; |
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242 | } |
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243 | |
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244 | ///Gives back the bottom right corner (if the bounding box is empty, then the return value is not defined) |
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245 | xy<T> bottomRight() const { |
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246 | return xy<T>(top_right.x,bottom_left.y); |
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247 | } |
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248 | |
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249 | ///Gives back the top left corner (if the bounding box is empty, then the return value is not defined) |
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250 | xy<T> topLeft() const { |
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251 | return xy<T>(bottom_left.x,top_right.y); |
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252 | } |
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253 | |
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254 | ///Gives back the bottom of the box (if the bounding box is empty, then the return value is not defined) |
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255 | T bottom() const { |
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256 | return bottom_left.y; |
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257 | } |
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258 | |
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259 | ///Gives back the top of the box (if the bounding box is empty, then the return value is not defined) |
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260 | T top() const { |
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261 | return top_right.y; |
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262 | } |
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263 | |
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264 | ///Gives back the left side of the box (if the bounding box is empty, then the return value is not defined) |
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265 | T left() const { |
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266 | return bottom_left.x; |
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267 | } |
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268 | |
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269 | ///Gives back the right side of the box (if the bounding box is empty, then the return value is not defined) |
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270 | T right() const { |
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271 | return top_right.x; |
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272 | } |
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273 | |
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274 | ///Gives back the height of the box (if the bounding box is empty, then the return value is not defined) |
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275 | T height() const { |
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276 | return top_right.y-bottom_left.y; |
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277 | } |
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278 | |
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279 | ///Gives back the width of the box (if the bounding box is empty, then the return value is not defined) |
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280 | T width() const { |
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281 | return top_right.x-bottom_left.x; |
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282 | } |
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283 | |
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284 | ///Checks whether a point is inside a bounding box |
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285 | bool inside(const xy<T>& u){ |
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286 | if (_empty) |
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287 | return false; |
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288 | else{ |
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289 | return ((u.x-bottom_left.x)*(top_right.x-u.x) >= 0 && |
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290 | (u.y-bottom_left.y)*(top_right.y-u.y) >= 0 ); |
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291 | } |
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292 | } |
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293 | |
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294 | ///Increments a bounding box with a point |
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295 | BoundingBox& operator +=(const xy<T>& u){ |
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296 | if (_empty){ |
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297 | bottom_left=top_right=u; |
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298 | _empty = false; |
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299 | } |
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300 | else{ |
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301 | if (bottom_left.x > u.x) bottom_left.x = u.x; |
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302 | if (bottom_left.y > u.y) bottom_left.y = u.y; |
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303 | if (top_right.x < u.x) top_right.x = u.x; |
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304 | if (top_right.y < u.y) top_right.y = u.y; |
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305 | } |
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306 | return *this; |
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307 | } |
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308 | |
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309 | ///Sums a bounding box and a point |
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310 | BoundingBox operator +(const xy<T>& u){ |
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311 | BoundingBox b = *this; |
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312 | return b += u; |
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313 | } |
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314 | |
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315 | ///Increments a bounding box with an other bounding box |
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316 | BoundingBox& operator +=(const BoundingBox &u){ |
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317 | if ( !u.empty() ){ |
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318 | *this += u.bottomLeft(); |
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319 | *this += u.topRight(); |
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320 | } |
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321 | return *this; |
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322 | } |
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323 | |
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324 | ///Sums two bounding boxes |
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325 | BoundingBox operator +(const BoundingBox& u){ |
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326 | BoundingBox b = *this; |
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327 | return b += u; |
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328 | } |
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329 | |
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330 | };//class Boundingbox |
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331 | |
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332 | |
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333 | ///Map of x-coordinates of an xy<>-map |
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334 | |
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335 | ///\ingroup maps |
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336 | /// |
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337 | template<class M> |
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338 | class XMap |
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339 | { |
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340 | M &_map; |
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341 | public: |
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342 | typedef typename M::Value::Value Value; |
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343 | typedef typename M::Key Key; |
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344 | ///\e |
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345 | XMap(M &map) : _map(map) {} |
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346 | Value operator[](Key k) const {return _map[k].x;} |
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347 | void set(Key k,Value v) {_map.set(k,typename M::Value(v,_map[k].y));} |
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348 | }; |
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349 | |
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350 | ///Returns an \ref XMap class |
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351 | |
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352 | ///This function just returns an \ref XMap class. |
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353 | /// |
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354 | ///\ingroup maps |
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355 | ///\relates XMap |
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356 | template<class M> |
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357 | inline XMap<M> xMap(M &m) |
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358 | { |
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359 | return XMap<M>(m); |
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360 | } |
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361 | |
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362 | ///Constant (read only) version of \ref XMap |
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363 | |
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364 | ///\ingroup maps |
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365 | /// |
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366 | template<class M> |
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367 | class ConstXMap |
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368 | { |
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369 | const M &_map; |
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370 | public: |
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371 | typedef typename M::Value::Value Value; |
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372 | typedef typename M::Key Key; |
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373 | ///\e |
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374 | ConstXMap(const M &map) : _map(map) {} |
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375 | Value operator[](Key k) const {return _map[k].x;} |
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376 | }; |
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377 | |
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378 | ///Returns a \ref ConstXMap class |
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379 | |
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380 | ///This function just returns an \ref ConstXMap class. |
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381 | /// |
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382 | ///\ingroup maps |
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383 | ///\relates ConstXMap |
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384 | template<class M> |
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385 | inline ConstXMap<M> xMap(const M &m) |
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386 | { |
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387 | return ConstXMap<M>(m); |
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388 | } |
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389 | |
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390 | ///Map of y-coordinates of an xy<>-map |
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391 | |
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392 | ///\ingroup maps |
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393 | /// |
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394 | template<class M> |
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395 | class YMap |
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396 | { |
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397 | M &_map; |
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398 | public: |
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399 | typedef typename M::Value::Value Value; |
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400 | typedef typename M::Key Key; |
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401 | ///\e |
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402 | YMap(M &map) : _map(map) {} |
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403 | Value operator[](Key k) const {return _map[k].y;} |
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404 | void set(Key k,Value v) {_map.set(k,typename M::Value(_map[k].x,v));} |
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405 | }; |
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406 | |
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407 | ///Returns an \ref YMap class |
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408 | |
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409 | ///This function just returns an \ref YMap class. |
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410 | /// |
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411 | ///\ingroup maps |
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412 | ///\relates YMap |
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413 | template<class M> |
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414 | inline YMap<M> yMap(M &m) |
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415 | { |
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416 | return YMap<M>(m); |
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417 | } |
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418 | |
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419 | ///Constant (read only) version of \ref YMap |
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420 | |
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421 | ///\ingroup maps |
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422 | /// |
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423 | template<class M> |
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424 | class ConstYMap |
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425 | { |
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426 | const M &_map; |
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427 | public: |
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428 | typedef typename M::Value::Value Value; |
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429 | typedef typename M::Key Key; |
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430 | ///\e |
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431 | ConstYMap(const M &map) : _map(map) {} |
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432 | Value operator[](Key k) const {return _map[k].y;} |
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433 | }; |
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434 | |
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435 | ///Returns a \ref ConstYMap class |
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436 | |
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437 | ///This function just returns an \ref ConstYMap class. |
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438 | /// |
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439 | ///\ingroup maps |
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440 | ///\relates ConstYMap |
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441 | template<class M> |
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442 | inline ConstYMap<M> yMap(const M &m) |
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443 | { |
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444 | return ConstYMap<M>(m); |
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445 | } |
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446 | |
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447 | |
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448 | ///Map of the \ref xy::normSquare() "normSquare()" of an \ref xy "xy"-map |
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449 | |
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450 | ///Map of the \ref xy::normSquare() "normSquare()" of an \ref xy "xy"-map |
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451 | ///\ingroup maps |
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452 | /// |
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453 | template<class M> |
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454 | class NormSquareMap |
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455 | { |
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456 | const M &_map; |
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457 | public: |
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458 | typedef typename M::Value::Value Value; |
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459 | typedef typename M::Key Key; |
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460 | ///\e |
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461 | NormSquareMap(const M &map) : _map(map) {} |
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462 | Value operator[](Key k) const {return _map[k].normSquare();} |
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463 | }; |
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464 | |
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465 | ///Returns a \ref NormSquareMap class |
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466 | |
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467 | ///This function just returns an \ref NormSquareMap class. |
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468 | /// |
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469 | ///\ingroup maps |
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470 | ///\relates NormSquareMap |
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471 | template<class M> |
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472 | inline NormSquareMap<M> normSquareMap(const M &m) |
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473 | { |
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474 | return NormSquareMap<M>(m); |
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475 | } |
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476 | |
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477 | /// @} |
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478 | |
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479 | |
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480 | } //namespace lemon |
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481 | |
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482 | #endif //LEMON_XY_H |
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