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annotate dwtx/draw2d/geometry/Ray.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.geometry.Ray;
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14
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15 import dwt.dwthelper.utils;
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16 import tango.text.convert.Format;
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17
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18 import dwtx.draw2d.geometry.Point;
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19
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20
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21 /**
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22 * Represents a 2-dimensional directional Vector, or Ray. {@link java.util.Vector} is
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23 * commonly imported, so the name Ray was chosen.
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24 */
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25 public final class Ray {
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26
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27 /** the X value */
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28 public int x;
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29 /** the Y value*/
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30 public int y;
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31
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32 /**
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33 * Constructs a Ray &lt;0, 0&gt; with no direction and magnitude.
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34 * @since 2.0
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35 */
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36 public this() { }
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37
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38 /**
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39 * Constructs a Ray pointed in the specified direction.
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40 *
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41 * @param x X value.
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42 * @param y Y value.
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43 * @since 2.0
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44 */
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45 public this(int x, int y) {
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46 this.x = x;
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47 this.y = y;
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48 }
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49
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50 /**
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51 * Constructs a Ray pointed in the direction specified by a Point.
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52 * @param p the Point
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53 * @since 2.0
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54 */
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55 public this(Point p) {
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56 x = p.x; y = p.y;
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57 }
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58
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59 /**
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60 * Constructs a Ray representing the direction and magnitude between to provided Points.
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61 * @param start Strarting Point
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62 * @param end End Point
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63 * @since 2.0
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64 */
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65 public this(Point start, Point end) {
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66 x = end.x - start.x;
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67 y = end.y - start.y;
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68 }
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69
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70 /**
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71 * Constructs a Ray representing the difference between two provided Rays.
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72 * @param start The start Ray
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73 * @param end The end Ray
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74 * @since 2.0
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75 */
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76 public this(Ray start, Ray end) {
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77 x = end.x - start.x;
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78 y = end.y - start.y;
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79 }
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80
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81 /**
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82 * Calculates the magnitude of the cross product of this Ray with another.
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83 * Represents the amount by which two Rays are directionally different.
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84 * Parallel Rays return a value of 0.
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85 * @param r Ray being compared
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86 * @return The assimilarity
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87 * @see #similarity(Ray)
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88 * @since 2.0
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89 */
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90 public int assimilarity(Ray r) {
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91 return Math.abs(x * r.y - y * r.x);
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92 }
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93
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94 /**
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95 * Calculates the dot product of this Ray with another.
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96 * @param r the Ray used to perform the dot product
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97 * @return The dot product
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98 * @since 2.0
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99 */
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100 public int dotProduct(Ray r) {
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101 return x * r.x + y * r.y;
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102 }
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103
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104 /**
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105 * @see java.lang.Object#equals(Object)
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106 */
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107 public override int opEquals(Object obj) {
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108 if (obj is this)
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109 return true;
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110 if ( auto r = cast(Ray)obj ) {
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111 return x is r.x && y is r.y;
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112 }
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113 return false;
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114 }
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115
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116 /**
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117 * Creates a new Ray which is the sum of this Ray with another.
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118 * @param r Ray to be added with this Ray
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119 * @return a new Ray
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120 * @since 2.0
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121 */
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122 public Ray getAdded(Ray r) {
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123 return new Ray(r.x + x, r.y + y);
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124 }
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125
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126 /**
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127 * Creates a new Ray which represents the average of this Ray with another.
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128 * @param r Ray to calculate the average.
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129 * @return a new Ray
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130 * @since 2.0
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131 */
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132 public Ray getAveraged(Ray r) {
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133 return new Ray ((x + r.x) / 2, (y + r.y) / 2);
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134 }
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135
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136 /**
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137 * Creates a new Ray which represents this Ray scaled by the amount provided.
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138 * @param s Value providing the amount to scale.
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139 * @return a new Ray
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140 * @since 2.0
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141 */
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142 public Ray getScaled(int s) {
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143 return new Ray(x * s, y * s);
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144 }
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145
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146 /**
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147 * @see java.lang.Object#toHash()
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148 */
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149 public override hash_t toHash() {
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150 return (x * y) ^ (x + y);
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151 }
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152
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153 /**
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154 * Returns true if this Ray has a non-zero horizontal comonent.
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155 * @return true if this Ray has a non-zero horizontal comonent
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156 * @since 2.0
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157 */
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158 public bool isHorizontal() {
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159 return x !is 0;
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160 }
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161
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162 /**
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163 * Returns the length of this Ray.
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164 * @return Length of this Ray
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165 * @since 2.0
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166 */
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167 public double length() {
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168 return Math.sqrt(cast(real)dotProduct(this));
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169 }
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170
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171 /**
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172 * Calculates the similarity of this Ray with another.
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173 * Similarity is defined as the absolute value of the dotProduct()
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174 * @param r Ray being tested for similarity
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175 * @return the Similarity
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176 * @see #assimilarity(Ray)
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177 * @since 2.0
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178 */
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179 public int similarity(Ray r) {
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180 return Math.abs(dotProduct(r));
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181 }
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182
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183 /**
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184 * @return a String representation
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185 */
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186 public String toString() {
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187 return Format("({}, {})", x, y );//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
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188 }
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189
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190 }