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annotate dwtx/draw2d/geometry/Point.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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children 1082a0fc2bb8
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.Point;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.PositionConstants;
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18 import dwtx.draw2d.geometry.Translatable;
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19 import dwtx.draw2d.geometry.Dimension;
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20 import dwtx.draw2d.geometry.Rectangle;
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21
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22 static import dwt.graphics.Point;
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23
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24 import tango.text.convert.Format;
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25
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26 /**
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27 * Represents a point (x, y) in 2-dimensional space. This class provides various methods
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28 * for manipulating this Point or creating new derived geometrical Objects.
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29 */
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30 public class Point
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31 : Cloneable, /+java.io.Serializable,+/ Translatable
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32 {
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33
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34 static final long serialVersionUID = 1;
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35 /**A singleton for use in short calculations*/
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36 public static const Point SINGLETON;
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37
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38 static this(){
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39 SINGLETON = new Point();
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40 }
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41
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42 /**x value*/
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43 public int x;
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44 /**y value*/
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45 public int y;
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46
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47 /**
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48 * Constructs a Point at location (0,0).
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49 * @since 2.0
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50 */
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51 public this() { }
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52
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53 /**
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54 * Constructs a Point at the same location as the given Point.
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55 * @param copy Point from which the initial values are taken.
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56 * @since 2.0
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57 */
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58 public this(Point copy) {
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59 x = copy.x;
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60 y = copy.y;
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61 }
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62
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63 /**
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64 * Constructs a Point at the same location as the given DWT Point.
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65 * @param copy Point from which the initial values are taken.
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66 * @since 2.0
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67 */
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68 public this(dwt.graphics.Point.Point copy) {
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69 x = copy.x;
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70 y = copy.y;
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71 }
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72
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73
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74 /**
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75 * Constructs a Point at the specified x and y locations.
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76 *
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77 * @param x x value
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78 * @param y y value
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79 * @since 2.0
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80 */
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81 public this(int x, int y) {
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82 this.x = x;
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83 this.y = y;
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84 }
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85
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86 /**
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87 * Constructs a Point at the specified x and y locations.
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88 * @param x x value
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89 * @param y y value
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90 * @since 2.0
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91 */
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92 public this(double x, double y) {
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93 this.x = cast(int)x;
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94 this.y = cast(int)y;
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95 }
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96
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97 /**
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98 * Test for equality.
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99 * @param o Object being tested for equality
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100 * @return true if both x and y values are equal
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101 * @since 2.0
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102 */
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103 public override int opEquals(Object o) {
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104 if ( auto p = cast(Point)o ) {
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105 return p.x is x && p.y is y;
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106 }
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107 return false;
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108 }
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109
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110 /**
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111 * @return a copy of this Point
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112 * @since 2.0
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113 */
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114 public Point getCopy() {
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115 return new Point(x, y);
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116 }
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117
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118 /**
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119 * Calculates the difference in between this Point and the one specified.
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120 * @param pt The Point being subtracted from this Point
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121 * @return A new Dimension representing the difference
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122 * @since 2.0
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123 */
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124 public Dimension getDifference(Point pt) {
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125 return new Dimension(this.x - pt.x, this.y - pt.y);
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126 }
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127
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128 /**
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129 * Calculates the distance from this Point to the one specified.
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130 * @param pt The Point being compared to this
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131 * @return The distance
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132 * @since 2.0
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133 */
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134 public double getDistance(Point pt) {
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135 return Math.sqrt(getPreciseDistance2(pt));
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136 }
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137
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138 /**
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139 * Calculates the distance squared between this Point and the one specified. If
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140 * the distance squared is larger than the maximum integer value, then
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141 * <code>Integer.MAX_VALUE</code> will be returned.
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142 * @param pt The reference Point
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143 * @return distance<sup>2</sup>
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144 * @since 2.0
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145 */
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146 public int getDistance2(Point pt) {
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147 long i = pt.x - x;
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148 long j = pt.y - y;
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149 long result = i * i + j * j;
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150 if (result > Integer.MAX_VALUE)
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151 return Integer.MAX_VALUE;
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152 return cast(int)result;
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153 }
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154
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155 private double getPreciseDistance2(Point pt) {
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156 double i = pt.preciseX() - preciseX();
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157 double j = pt.preciseY() - preciseY();
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158 return i * i + j * j;
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159 }
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160
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161 /**
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162 * Calculates the orthogonal distance to the specified point. The orthogonal distance is
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163 * the sum of the horizontal and vertical differences.
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164 * @param pt The reference Point
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165 * @return the orthoganal distance
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166 */
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167 public int getDistanceOrthogonal(Point pt) {
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168 return Math.abs(y - pt.y) + Math.abs(x - pt.x);
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169 }
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170
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171 /**
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172 * Creates a Point with negated x and y values.
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173 * @return A new Point
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174 * @since 2.0
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175 */
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176 public Point getNegated() {
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177 return getCopy().negate();
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178 }
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179
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180 /**
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181 * Calculates the relative position of the specified Point to this Point.
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182 * @param p The reference Point
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183 * @return NORTH, SOUTH, EAST, or WEST, as defined in {@link PositionConstants}
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184 */
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185 public int getPosition(Point p) {
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186 int dx = p.x - x;
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187 int dy = p.y - y;
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188 if (Math.abs(dx) > Math.abs(dy)) {
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189 if (dx < 0)
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190 return PositionConstants.WEST;
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191 return PositionConstants.EAST;
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192 }
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193 if (dy < 0)
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194 return PositionConstants.NORTH;
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195 return PositionConstants.SOUTH;
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196 }
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197
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198 /**
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199 * Creates a new Point from this Point by scaling by the specified amount.
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200 * @param amount scale factor
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201 * @return A new Point
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202 * @since 2.0
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203 */
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204 public Point getScaled(double amount) {
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205 return getCopy().scale(amount);
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206 }
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207
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208 /**
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209 * Creates a new DWT {@link dwt.graphics.Point Point} from this Point.
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210 * @return A new DWT Point
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211 * @since 2.0
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212 */
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213 public dwt.graphics.Point.Point getSWTPoint() {
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214 return new dwt.graphics.Point.Point(x, y);
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215 }
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216
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217 /**
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218 * Creates a new Point which is translated by the values of the input Dimension.
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219 * @param delta Dimension which provides the translation amounts.
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220 * @return A new Point
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221 * @since 2.0
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222 */
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223 public Point getTranslated(Dimension delta) {
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224 return getCopy().translate(delta);
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225 }
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226
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227 /**
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228 * Creates a new Point which is translated by the specified x and y values
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229 * @param x horizontal component
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230 * @param y vertical component
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231 * @return A new Point
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232 * @since 2.0
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233 */
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234 public Point getTranslated(int x, int y) {
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235 return getCopy().translate(x, y);
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236 }
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237
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238 /**
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239 * Creates a new Point which is translated by the values of the provided Point.
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240 * @param pt Point which provides the translation amounts.
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241 * @return A new Point
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242 * @since 2.0
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243 */
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244 public Point getTranslated(Point pt) {
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245 return getCopy().translate(pt);
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246 }
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247
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248 /**
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249 * Creates a new Point with the transposed values of this Point.
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250 * Can be useful in orientation change calculations.
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251 * @return A new Point
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252 * @since 2.0
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253 */
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254 public Point getTransposed() {
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255 return getCopy().transpose();
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256 }
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257
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258 /**
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259 * @see java.lang.Object#toHash()
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260 */
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261 public override hash_t toHash() {
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262 return (x * y) ^ (x + y);
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263 }
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264
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265 /**
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266 * Creates a new Point representing the MAX of two provided Points.
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267 * @param p1 first point
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268 * @param p2 second point
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269 * @return A new Point representing the Max()
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270 */
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271 public static Point max(Point p1, Point p2) {
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272 return (new Rectangle(p1, p2))
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273 .getBottomRight()
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274 .translate(-1, -1);
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275 }
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276
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277 /**
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278 * Creates a new Point representing the MIN of two provided Points.
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279 * @param p1 first point
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280 * @param p2 second point
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281 * @return A new Point representing the Min()
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282 */
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283 public static Point min(Point p1, Point p2) {
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284 return (new Rectangle(p1, p2)).getTopLeft();
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285 }
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286
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287 /**
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288 * Negates the x and y values of this Point.
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289 * @return <code>this</code> for convenience
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290 * @since 2.0
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291 */
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292 public Point negate() {
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293 x = -x;
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294 y = -y;
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295 return this;
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296 }
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297
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298 /** @see Translatable#performScale(double) */
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299 public void performScale(double factor) {
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300 scale(factor);
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301 }
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302
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303 /** @see Translatable#performTranslate(int, int) */
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304 public void performTranslate(int dx, int dy) {
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305 translate(dx, dy);
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306 }
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307
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308 /**
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309 * Scales this Point by the specified amount.
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310 * @return <code>this</code> for convenience
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311 * @param amount scale factor
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312 * @since 2.0
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313 */
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314 public Point scale(double amount) {
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315 x = cast(int)Math.floor(x * amount);
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316 y = cast(int)Math.floor(y * amount);
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317 return this;
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318 }
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319
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320 /**
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321 * Scales this Point by the specified values.
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322 * @param xAmount horizontal scale factor
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323 * @param yAmount vertical scale factor
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324 * @return <code>this</code> for convenience
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325 * @since 2.0
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326 */
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327 public Point scale(double xAmount, double yAmount) {
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328 x = cast(int)Math.floor(x * xAmount);
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329 y = cast(int)Math.floor(y * yAmount);
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330 return this;
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331 }
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332
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333 /**
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334 * Sets the location of this Point to the provided x and y locations.
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335 * @return <code>this</code> for convenience
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336 * @param x the x location
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337 * @param y the y location
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338 * @since 2.0
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339 */
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340 public Point setLocation(int x, int y) {
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341 this.x = x;
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342 this.y = y;
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343 return this;
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344 }
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345
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346 /**
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347 * Sets the location of this Point to the specified Point.
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348 * @return <code>this</code> for convenience
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349 * @param pt the Location
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350 * @since 2.0
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351 */
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352 public Point setLocation(Point pt) {
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353 x = pt.x;
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354 y = pt.y;
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355 return this;
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356 }
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357
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358 /**
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359 * @return String representation.
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360 * @since 2.0
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361 */
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362 public override String toString() {
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363 return Format("Point({}, {})", x, y );//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
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364 }
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365
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366 /**
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367 * Shifts the location of this Point by the location of the
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368 * input Point along each of the axes, and returns this for
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369 * convenience.
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370 *
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371 * @param p Point to which the origin is being shifted.
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372 * @return <code>this</code> for convenience
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373 * @since 2.0
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374 */
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375 public Point translate(Point p) {
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376 return translate(p.x, p.y);
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377 }
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378
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379 /**
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380 * Shifts this Point by the values of the Dimension along
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381 * each axis, and returns this for convenience.
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382 *
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383 * @param d Dimension by which the origin is being shifted.
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384 * @return <code>this</code> for convenience
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385 * @since 2.0
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386 */
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387 public Point translate(Dimension d) {
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388 return translate(d.width, d.height);
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389 }
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390
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391 /**
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392 * Shifts this Point by the values supplied along each axes, and
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393 * returns this for convenience.
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394 *
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395 * @param dx Amount by which point is shifted along X axis.
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396 * @param dy Amount by which point is shifted along Y axis.
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397 * @return <code>this</code> for convenience
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398 * @since 2.0
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399 */
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400 public Point translate(int dx, int dy) {
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401 x += dx;
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402 y += dy;
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403 return this;
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404 }
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405
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406 /**
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407 * Transposes this object. X and Y values are exchanged.
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408 * @return <code>this</code> for convenience
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409 * @since 2.0
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410 */
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411 public Point transpose() {
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412 int temp = x;
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413 x = y;
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414 y = temp;
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415 return this;
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416 }
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417
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418 /**
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419 * Returns <code>double</code> x coordinate
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420 *
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421 * @return <code>double</code> x coordinate
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422 * @since 3.4
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423 */
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424 public double preciseX() {
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425 return x;
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426 }
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427
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428 /**
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429 * Returns <code>double</code> y coordinate
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430 *
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431 * @return <code>double</code> y coordinate
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432 * @since 3.4
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433 */
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434 public double preciseY() {
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435 return y;
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436 }
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437
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438 }