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annotate tk/geometry.d @ 15:2f79aab4d385

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author "David Bryant <bagnose@gmail.com>"
date Sun, 12 Jul 2009 13:23:06 +0930
parents f0ade1b49fe7
children 9e63308b749c
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4
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1 module tk.geometry;
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2
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3 private import std.stdio;
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4 private import std.math;
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5 private import tk.misc;
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6
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7 struct Point {
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8 static immutable Point DEFAULT;
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9
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10 static this() {
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11 DEFAULT = Point(0.0, 0.0);
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12 }
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13
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14 this(in double x, in double y) {
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15 _x = x;
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16 _y = y;
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17 }
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18
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19 Point opAdd(in Vector v) const {
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20 return Point(_x + v._x, _y + v._y);
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21 }
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22
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23 Point opSub(in Vector v) const {
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24 return Point(_x - v._x, _y - v._y);
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25 }
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26
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27 Vector opSub(in Point p) const {
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28 return Vector(_x - p._x, _y - p._y);
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29 }
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30
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31 string toString() const {
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32 return std.string.format("(%f, %f)", _x, _y);
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33 }
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34
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35 double x() const { return _x; }
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36 double y() const { return _y; }
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37
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38 private {
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39 double _x, _y;
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40 }
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41 }
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42
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43 Point min_extents(in Point a, in Point b) {
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44 return Point(min(a.x, b.x), min(a.y, b.y));
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45 }
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46
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47 Point max_extents(in Point a, in Point b) {
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48 return Point(max(a.x, b.x), max(a.y, b.y));
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49 }
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50
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51 struct Vector {
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52 static Vector DEFAULT;
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53
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54 static this() {
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55 DEFAULT = Vector(0.0, 0.0);
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56 }
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57
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58 this(in double x, in double y) {
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59 _x = x;
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60 _y = y;
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61 }
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62
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63 Vector opAdd(in Vector v) const {
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64 return Vector(_x + v._x, _y + v._y);
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65 }
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66
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67 Vector opSub(in Vector v) const {
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68 return Vector(_x - v._x, _y - v._y);
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69 }
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70
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71 Vector opNeg() const {
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72 return Vector(-_x, -_y);
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73 }
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74
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75 Vector opMul_r(in double d) const {
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76 return Vector(d * _x, d * _y);
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77 }
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78
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79 Vector opDiv(in double d) const {
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80 return Vector(_x / d, _y / d);
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81 }
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82
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83 double length() const {
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84 return sqrt(_x * _x + _y * _y);
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85 }
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86
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87 string toString() const {
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88 return std.string.format("[%f, %f]", _x, _y);
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89 }
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90
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91 double x() const { return _x; }
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92 double y() const { return _y; }
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93
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94 private {
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95 double _x, _y;
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96 }
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97 }
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98
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99 struct Rectangle {
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100 static Rectangle DEFAULT;
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101
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102 static this() {
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103 DEFAULT = Rectangle(Point.DEFAULT, Vector.DEFAULT);
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104 }
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105
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106 /*
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107 static Rectangle from_arbitrary_corners(in Point corner1, in Point corner) {
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108 }
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109 */
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110
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111 this(in Point position, in Vector size) {
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112 this(position.x, position.y, size.x, size.y);
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113 }
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114
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115 this(in Point corner1, in Point corner) {
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116 this(corner1.x, corner1.y, corner.x - corner1.x, corner.y - corner1.y);
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117 }
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118
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119 Point position() const {
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120 return _position;
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121 }
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122
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123 Vector size() const {
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124 return _size;
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125 }
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126
4
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127 alias position min_corner;
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128
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129 Point max_corner() const {
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130 return _position + _size;
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131 }
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132
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133 bool valid() const {
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134 return _size.x > 0.0 & _size.y > 0.0;
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135 }
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136
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137 bool invalid() const {
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138 return !valid();
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139 }
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140
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141 double area() const {
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142 return _size.x * _size.y;
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143 }
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144
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145 // Intersection
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146 Rectangle opAnd(in Rectangle r) const {
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147 if (invalid() || r.invalid()) {
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148 return DEFAULT;
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149 }
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150 else {
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151 Point max = min_extents(max_corner(), r.max_corner());
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152 Point min = max_extents(min_corner(), r.min_corner());
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153
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154 if (max.x < min.x || max.y < min.y) {
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155 return DEFAULT;
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156 }
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157 else {
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158 return Rectangle(min, max);
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159 }
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160 }
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161 }
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162
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163 // Union
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164 Rectangle opOr(in Rectangle r) const {
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165 if (invalid()) {
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166 return r;
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167 }
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168 else if (r.invalid()) {
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169 return this;
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170 }
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171 else {
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172 return Rectangle(min_extents(min_corner(), r.min_corner()),
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173 max_extents(max_corner(), r.max_corner()));
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174 }
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175 }
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176
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177 // TODO make these free functions
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178
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179 Rectangle moved(in Vector displacement) const {
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180 return Rectangle(_position + displacement, _size);
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181 }
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182
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183 Rectangle expanded(in Vector expand_amount) const {
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184 return Rectangle(_position, _size + expand_amount);
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185 }
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186
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187 Rectangle shrunk(in Vector shrink_amount) const {
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188 return Rectangle(_position, _size - shrink_amount);
4
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189 }
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190
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191 Rectangle resized(in Vector new_size) const {
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192 return Rectangle(_position, new_size);
4
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193 }
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194
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195 Rectangle repositioned(in Point new_position) const {
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196 return Rectangle(new_position, _size);
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197 }
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198
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199 Point centre() const {
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200 return _position + _size / 2.0;
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201 }
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202
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203 string toString() const {
4
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204 return std.string.format("{%s, %s}", _position, _size);
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205 }
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206
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207 private {
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208 this(double x, double y, double w, double h) {
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209 if (w < 0.0) { x += w; w = -w; }
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210 if (h < 0.0) { y += h; h = -h; }
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211 _position = Point(x, y);
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212 _size = Vector(w, h);
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213 }
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214
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215 Point _position;
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216 Vector _size;
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217 }
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218 }