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annotate dwtx/draw2d/geometry/Point.d @ 101:1082a0fc2bb8

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First Draw2D example running
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 02:17:46 +0200
parents 95307ad235d9
children
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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 private static Point SINGLETON_;
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37 public static Point SINGLETON(){
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38 if( SINGLETON_ is null ){
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39 synchronized( Point.classinfo ){
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40 if( SINGLETON_ is null ){
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41 SINGLETON_ = new Point();
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42 }
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43 }
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44 }
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45 return SINGLETON_;
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46 }
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47
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48 /**x value*/
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49 public int x;
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50 /**y value*/
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51 public int y;
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52
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53 /**
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54 * Constructs a Point at location (0,0).
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55 * @since 2.0
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56 */
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57 public this() { }
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58
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59 /**
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60 * Constructs a Point at the same location as the given Point.
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61 * @param copy Point from which the initial values are taken.
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62 * @since 2.0
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63 */
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64 public this(Point copy) {
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65 x = copy.x;
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66 y = copy.y;
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67 }
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68
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69 /**
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70 * Constructs a Point at the same location as the given DWT Point.
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71 * @param copy Point from which the initial values are taken.
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72 * @since 2.0
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73 */
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74 public this(dwt.graphics.Point.Point copy) {
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75 x = copy.x;
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76 y = copy.y;
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77 }
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78
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79
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80 /**
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81 * Constructs a Point at the specified x and y locations.
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82 *
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83 * @param x x value
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84 * @param y y value
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85 * @since 2.0
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86 */
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87 public this(int x, int y) {
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88 this.x = x;
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89 this.y = y;
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90 }
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91
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92 /**
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93 * Constructs a Point at the specified x and y locations.
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94 * @param x x value
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95 * @param y y value
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96 * @since 2.0
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97 */
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98 public this(double x, double y) {
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99 this.x = cast(int)x;
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100 this.y = cast(int)y;
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101 }
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102
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103 /**
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104 * Test for equality.
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105 * @param o Object being tested for equality
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106 * @return true if both x and y values are equal
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107 * @since 2.0
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108 */
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109 public override int opEquals(Object o) {
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110 if ( auto p = cast(Point)o ) {
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111 return p.x is x && p.y is 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 * @return a copy of this Point
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118 * @since 2.0
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119 */
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120 public Point getCopy() {
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121 return new Point(x, y);
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122 }
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123
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124 /**
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125 * Calculates the difference in between this Point and the one specified.
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126 * @param pt The Point being subtracted from this Point
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127 * @return A new Dimension representing the difference
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128 * @since 2.0
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129 */
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130 public Dimension getDifference(Point pt) {
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131 return new Dimension(this.x - pt.x, this.y - pt.y);
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132 }
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133
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134 /**
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135 * Calculates the distance from this Point to the one specified.
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136 * @param pt The Point being compared to this
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137 * @return The distance
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138 * @since 2.0
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139 */
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140 public double getDistance(Point pt) {
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141 return Math.sqrt(getPreciseDistance2(pt));
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142 }
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143
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144 /**
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145 * Calculates the distance squared between this Point and the one specified. If
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146 * the distance squared is larger than the maximum integer value, then
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147 * <code>Integer.MAX_VALUE</code> will be returned.
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148 * @param pt The reference Point
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149 * @return distance<sup>2</sup>
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150 * @since 2.0
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151 */
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152 public int getDistance2(Point pt) {
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153 long i = pt.x - x;
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154 long j = pt.y - y;
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155 long result = i * i + j * j;
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156 if (result > Integer.MAX_VALUE)
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157 return Integer.MAX_VALUE;
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158 return cast(int)result;
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159 }
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160
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161 private double getPreciseDistance2(Point pt) {
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162 double i = pt.preciseX() - preciseX();
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163 double j = pt.preciseY() - preciseY();
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164 return i * i + j * j;
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165 }
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166
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167 /**
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168 * Calculates the orthogonal distance to the specified point. The orthogonal distance is
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169 * the sum of the horizontal and vertical differences.
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170 * @param pt The reference Point
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171 * @return the orthoganal distance
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172 */
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173 public int getDistanceOrthogonal(Point pt) {
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174 return Math.abs(y - pt.y) + Math.abs(x - pt.x);
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175 }
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176
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177 /**
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178 * Creates a Point with negated x and y values.
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179 * @return A new Point
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180 * @since 2.0
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181 */
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182 public Point getNegated() {
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183 return getCopy().negate();
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184 }
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185
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186 /**
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187 * Calculates the relative position of the specified Point to this Point.
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188 * @param p The reference Point
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189 * @return NORTH, SOUTH, EAST, or WEST, as defined in {@link PositionConstants}
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190 */
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191 public int getPosition(Point p) {
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192 int dx = p.x - x;
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193 int dy = p.y - y;
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194 if (Math.abs(dx) > Math.abs(dy)) {
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195 if (dx < 0)
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196 return PositionConstants.WEST;
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197 return PositionConstants.EAST;
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198 }
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199 if (dy < 0)
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200 return PositionConstants.NORTH;
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201 return PositionConstants.SOUTH;
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202 }
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203
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204 /**
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205 * Creates a new Point from this Point by scaling by the specified amount.
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206 * @param amount scale factor
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207 * @return A new Point
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208 * @since 2.0
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209 */
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210 public Point getScaled(double amount) {
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211 return getCopy().scale(amount);
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212 }
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213
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214 /**
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215 * Creates a new DWT {@link dwt.graphics.Point Point} from this Point.
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216 * @return A new DWT Point
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217 * @since 2.0
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218 */
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219 public dwt.graphics.Point.Point getSWTPoint() {
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220 return new dwt.graphics.Point.Point(x, y);
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221 }
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222
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223 /**
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224 * Creates a new Point which is translated by the values of the input Dimension.
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225 * @param delta Dimension which provides the translation amounts.
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226 * @return A new Point
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227 * @since 2.0
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228 */
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229 public Point getTranslated(Dimension delta) {
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230 return getCopy().translate(delta);
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231 }
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232
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233 /**
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234 * Creates a new Point which is translated by the specified x and y values
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235 * @param x horizontal component
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236 * @param y vertical component
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237 * @return A new Point
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238 * @since 2.0
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239 */
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240 public Point getTranslated(int x, int y) {
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241 return getCopy().translate(x, y);
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242 }
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243
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244 /**
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245 * Creates a new Point which is translated by the values of the provided Point.
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246 * @param pt Point which provides the translation amounts.
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247 * @return A new Point
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248 * @since 2.0
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249 */
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250 public Point getTranslated(Point pt) {
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251 return getCopy().translate(pt);
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252 }
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253
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254 /**
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255 * Creates a new Point with the transposed values of this Point.
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256 * Can be useful in orientation change calculations.
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257 * @return A new Point
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258 * @since 2.0
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259 */
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260 public Point getTransposed() {
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261 return getCopy().transpose();
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262 }
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263
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264 /**
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265 * @see java.lang.Object#toHash()
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266 */
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267 public override hash_t toHash() {
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268 return (x * y) ^ (x + y);
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269 }
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270
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271 /**
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272 * Creates a new Point representing the MAX of two provided Points.
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273 * @param p1 first point
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274 * @param p2 second point
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275 * @return A new Point representing the Max()
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276 */
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277 public static Point max(Point p1, Point p2) {
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278 return (new Rectangle(p1, p2))
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279 .getBottomRight()
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280 .translate(-1, -1);
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281 }
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282
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283 /**
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284 * Creates a new Point representing the MIN of two provided Points.
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285 * @param p1 first point
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286 * @param p2 second point
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287 * @return A new Point representing the Min()
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288 */
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289 public static Point min(Point p1, Point p2) {
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290 return (new Rectangle(p1, p2)).getTopLeft();
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291 }
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292
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293 /**
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294 * Negates the x and y values of this Point.
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295 * @return <code>this</code> for convenience
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296 * @since 2.0
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297 */
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298 public Point negate() {
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299 x = -x;
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300 y = -y;
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301 return this;
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302 }
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303
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304 /** @see Translatable#performScale(double) */
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305 public void performScale(double factor) {
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306 scale(factor);
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307 }
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308
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309 /** @see Translatable#performTranslate(int, int) */
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310 public void performTranslate(int dx, int dy) {
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311 translate(dx, dy);
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312 }
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313
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314 /**
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315 * Scales this Point by the specified amount.
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316 * @return <code>this</code> for convenience
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317 * @param amount scale factor
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318 * @since 2.0
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319 */
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320 public Point scale(double amount) {
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321 x = cast(int)Math.floor(x * amount);
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322 y = cast(int)Math.floor(y * amount);
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323 return this;
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324 }
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325
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326 /**
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327 * Scales this Point by the specified values.
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328 * @param xAmount horizontal scale factor
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329 * @param yAmount vertical scale factor
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330 * @return <code>this</code> for convenience
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331 * @since 2.0
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332 */
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333 public Point scale(double xAmount, double yAmount) {
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334 x = cast(int)Math.floor(x * xAmount);
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335 y = cast(int)Math.floor(y * yAmount);
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336 return this;
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337 }
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338
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339 /**
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340 * Sets the location of this Point to the provided x and y locations.
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341 * @return <code>this</code> for convenience
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342 * @param x the x location
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343 * @param y the y location
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344 * @since 2.0
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345 */
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346 public Point setLocation(int x, int y) {
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347 this.x = x;
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348 this.y = y;
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349 return this;
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350 }
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351
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352 /**
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353 * Sets the location of this Point to the specified Point.
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354 * @return <code>this</code> for convenience
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355 * @param pt the Location
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356 * @since 2.0
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357 */
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358 public Point setLocation(Point pt) {
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359 x = pt.x;
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360 y = pt.y;
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361 return this;
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362 }
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363
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364 /**
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365 * @return String representation.
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366 * @since 2.0
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367 */
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368 public override String toString() {
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369 return Format("Point({}, {})", x, y );//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
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370 }
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371
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372 /**
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373 * Shifts the location of this Point by the location of the
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374 * input Point along each of the axes, and returns this for
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375 * convenience.
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376 *
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377 * @param p Point to which the origin is being shifted.
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378 * @return <code>this</code> for convenience
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379 * @since 2.0
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380 */
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381 public Point translate(Point p) {
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382 return translate(p.x, p.y);
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383 }
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parents:
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384
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parents:
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385 /**
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parents:
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386 * Shifts this Point by the values of the Dimension along
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387 * each axis, and returns this for convenience.
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388 *
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389 * @param d Dimension by which the origin is being shifted.
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diff changeset
390 * @return <code>this</code> for convenience
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391 * @since 2.0
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392 */
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393 public Point translate(Dimension d) {
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394 return translate(d.width, d.height);
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395 }
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396
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parents:
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397 /**
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398 * Shifts this Point by the values supplied along each axes, and
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399 * returns this for convenience.
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400 *
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401 * @param dx Amount by which point is shifted along X axis.
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402 * @param dy Amount by which point is shifted along Y axis.
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diff changeset
403 * @return <code>this</code> for convenience
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diff changeset
404 * @since 2.0
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405 */
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406 public Point translate(int dx, int dy) {
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407 x += dx;
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408 y += dy;
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409 return this;
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410 }
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diff changeset
411
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parents:
diff changeset
412 /**
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diff changeset
413 * Transposes this object. X and Y values are exchanged.
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diff changeset
414 * @return <code>this</code> for convenience
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415 * @since 2.0
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416 */
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417 public Point transpose() {
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418 int temp = x;
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419 x = y;
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420 y = temp;
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421 return this;
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422 }
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423
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parents:
diff changeset
424 /**
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diff changeset
425 * Returns <code>double</code> x coordinate
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parents:
diff changeset
426 *
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427 * @return <code>double</code> x coordinate
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428 * @since 3.4
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429 */
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430 public double preciseX() {
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431 return x;
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432 }
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parents:
diff changeset
433
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parents:
diff changeset
434 /**
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diff changeset
435 * Returns <code>double</code> y coordinate
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parents:
diff changeset
436 *
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437 * @return <code>double</code> y coordinate
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parents:
diff changeset
438 * @since 3.4
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parents:
diff changeset
439 */
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440 public double preciseY() {
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441 return y;
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diff changeset
442 }
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
443
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
444 }