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annotate tk/geometry.d @ 17:c643c04e3f5e

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author David Bryant <daveb@acres.com.au>
date Mon, 13 Jul 2009 16:46:21 +0930
parents 9e63308b749c
children 22abbf4cde96
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1 module tk.geometry;
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2
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3 private {
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4 import std.stdio;
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5 import std.math;
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6 import tk.misc;
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7 }
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8
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9 struct Point {
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10 static immutable Point DEFAULT;
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11
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12 static this() {
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13 DEFAULT = Point(0.0, 0.0);
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14 }
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15
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16 this(in double x, in double y) {
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17 _x = x;
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18 _y = y;
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19 }
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20
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21 Point opAdd(in Vector v) const {
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22 return Point(_x + v._x, _y + v._y);
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23 }
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24
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25 Point opSub(in Vector v) const {
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26 return Point(_x - v._x, _y - v._y);
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27 }
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28
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29 Vector opSub(in Point p) const {
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30 return Vector(_x - p._x, _y - p._y);
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31 }
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33 string toString() {
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34 return std.string.format("(%f, %f)", _x, _y);
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35 }
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36
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37 double x() const { return _x; }
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38 double y() const { return _y; }
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39
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40 private {
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41 double _x, _y;
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42 }
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43 }
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44
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45 Point min_extents(in Point a, in Point b) {
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46 return Point(min(a.x, b.x), min(a.y, b.y));
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47 }
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48
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49 Point max_extents(in Point a, in Point b) {
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50 return Point(max(a.x, b.x), max(a.y, b.y));
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51 }
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52
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53 struct Vector {
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54 static Vector DEFAULT;
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55
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56 static this() {
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57 DEFAULT = Vector(0.0, 0.0);
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58 }
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59
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60 this(in double x, in double y) {
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61 _x = x;
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62 _y = y;
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63 }
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64
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65 Vector opAdd(in Vector v) const {
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66 return Vector(_x + v._x, _y + v._y);
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67 }
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68
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69 Vector opSub(in Vector v) const {
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70 return Vector(_x - v._x, _y - v._y);
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71 }
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72
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73 Vector opNeg() const {
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74 return Vector(-_x, -_y);
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75 }
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76
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77 Vector opMul_r(in double d) const {
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78 return Vector(d * _x, d * _y);
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79 }
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80
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81 Vector opDiv(in double d) const {
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82 return Vector(_x / d, _y / d);
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83 }
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84
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85 double length() const {
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86 return sqrt(_x * _x + _y * _y);
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87 }
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88
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89 string toString() {
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90 return std.string.format("[%f, %f]", _x, _y);
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91 }
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92
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93 double x() const { return _x; }
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94 double y() const { return _y; }
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95
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96 private {
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97 double _x, _y;
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98 }
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99 }
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100
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101 struct Rectangle {
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102 static Rectangle DEFAULT;
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103
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104 static this() {
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105 DEFAULT = Rectangle(Point.DEFAULT, Vector.DEFAULT);
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106 }
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107
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108 /*
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109 static Rectangle from_arbitrary_corners(in Point corner1, in Point corner) {
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110 }
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111 */
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112
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113 this(in Point position, in Vector size) {
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114 this(position.x, position.y, size.x, size.y);
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115 }
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116
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117 this(in Point corner1, in Point corner) {
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118 this(corner1.x, corner1.y, corner.x - corner1.x, corner.y - corner1.y);
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119 }
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120
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121 Point position() const {
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122 return _position;
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123 }
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124
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125 Vector size() const {
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126 return _size;
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127 }
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128
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129 alias position min_corner;
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130
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131 Point max_corner() const {
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132 return _position + _size;
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133 }
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134
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135 bool valid() const {
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136 return _size.x > 0.0 & _size.y > 0.0;
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137 }
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138
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139 bool invalid() const {
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140 return !valid();
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141 }
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142
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143 double area() const {
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144 return _size.x * _size.y;
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145 }
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146
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147 // Intersection
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148 Rectangle opAnd(in Rectangle r) const {
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149 if (invalid() || r.invalid()) {
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150 return DEFAULT;
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151 }
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152 else {
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153 Point max = min_extents(max_corner(), r.max_corner());
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154 Point min = max_extents(min_corner(), r.min_corner());
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155
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156 if (max.x < min.x || max.y < min.y) {
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157 return DEFAULT;
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158 }
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159 else {
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160 return Rectangle(min, max);
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161 }
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162 }
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163 }
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164
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165 // Union
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166 Rectangle opOr(in Rectangle r) const {
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167 if (invalid()) {
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168 return r;
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169 }
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170 else if (r.invalid()) {
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171 return this;
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172 }
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173 else {
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174 return Rectangle(min_extents(min_corner(), r.min_corner()),
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175 max_extents(max_corner(), r.max_corner()));
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176 }
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177 }
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178
15
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179 // TODO make these free functions
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180
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181 Rectangle moved(in Vector displacement) const {
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182 return Rectangle(_position + displacement, _size);
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183 }
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184
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185 Rectangle expanded(in Vector expand_amount) const {
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186 return Rectangle(_position, _size + expand_amount);
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187 }
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188
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189 Rectangle shrunk(in Vector shrink_amount) const {
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190 return Rectangle(_position, _size - shrink_amount);
4
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191 }
15
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192
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193 Rectangle resized(in Vector new_size) const {
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194 return Rectangle(_position, new_size);
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195 }
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196
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197 Rectangle repositioned(in Point new_position) const {
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198 return Rectangle(new_position, _size);
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199 }
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200
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201 void get_quantised(out int x, out int y, out int w, out int h) const {
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202 x = cast(int)floor(_position.x);
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203 y = cast(int)floor(_position.y);
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204 w = cast(int)ceil(_position.x + _size.x) - x;
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205 h = cast(int)ceil(_position.y + _size.y) - y;
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206 }
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207
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208 //
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209
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210 Point centre() const {
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211 return _position + _size / 2.0;
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212 }
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213
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214 string toString() {
4
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215 return std.string.format("{%s, %s}", _position, _size);
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216 }
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217
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218 private {
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219 this(double x, double y, double w, double h) {
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220 if (w < 0.0) { x += w; w = -w; }
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221 if (h < 0.0) { y += h; h = -h; }
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222 _position = Point(x, y);
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223 _size = Vector(w, h);
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224 }
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225
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226 Point _position;
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227 Vector _size;
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228 }
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229 }