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annotate SilverlightGlimpse/SilverFlow.Controls/Extensions/GeometryExtensions.cs @ 63:536498832a79

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Latest version before changing bindings to Listbox
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sun, 22 Apr 2012 13:33:42 +0100
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1 using System;
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2 using System.Windows;
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3 using SilverFlow.Geometry;
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4
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5 namespace SilverFlow.Controls.Extensions
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6 {
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7 /// <summary>
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8 /// Geometry extensions
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9 /// </summary>
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10 public static class GeometryExtensions
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11 {
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12 /// <summary>
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13 /// Rounds the specified point to the nearest integer coordinates.
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14 /// </summary>
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15 /// <param name="point">The point to round coordinates.</param>
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16 /// <returns>New point with rounded coordinates.</returns>
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17 public static Point Round(this Point point)
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18 {
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19 return new Point(Math.Round(point.X), Math.Round(point.Y));
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20 }
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21
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22 /// <summary>
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23 /// Ensures that coordinates are positive.
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24 /// </summary>
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25 /// <param name="point">The point.</param>
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26 /// <returns>Point with positive coordinates.</returns>
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27 public static Point EnsurePositive(this Point point)
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28 {
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29 return new Point()
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30 {
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31 X = (point.X < 0) ? 0 : point.X,
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32 Y = (point.Y < 0) ? 0 : point.Y
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33 };
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34 }
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35
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36 /// <summary>
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37 /// Gets position of the specified rectangle.
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38 /// </summary>
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39 /// <param name="rect">Rectangle.</param>
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40 /// <returns>Upper left corner of the rectangle.</returns>
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41 public static Point Position(this Rect rect)
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42 {
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43 return new Point(rect.X, rect.Y);
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44 }
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45
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46 /// <summary>
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47 /// Gets position the lower right corner of the rectangle.
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48 /// </summary>
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49 /// <param name="rect">Rectangle.</param>
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50 /// <returns>Lower right corner of the rectangle.</returns>
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51 public static Point BottomRight(this Rect rect)
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52 {
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53 return new Point(rect.Right, rect.Bottom);
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54 }
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55
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56 /// <summary>
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57 /// Gets position the lower left corner of the rectangle.
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58 /// </summary>
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59 /// <param name="rect">Rectangle.</param>
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60 /// <returns>Lower left corner of the rectangle.</returns>
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61 public static Point BottomLeft(this Rect rect)
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62 {
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63 return new Point(rect.X, rect.Bottom);
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64 }
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65
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66 /// <summary>
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67 /// Gets position the upper right corner of the rectangle.
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68 /// </summary>
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69 /// <param name="rect">Rectangle.</param>
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70 /// <returns>Upper right corner of the rectangle.</returns>
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71 public static Point TopRight(this Rect rect)
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72 {
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73 return new Point(rect.Right, rect.Y);
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74 }
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75
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76 /// <summary>
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77 /// Ensures that coordinates of the point are in the specified bounds.
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78 /// </summary>
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79 /// <param name="point">The point.</param>
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80 /// <param name="bounds">The bounds.</param>
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81 /// <returns>Point within the boinds.</returns>
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82 public static Point EnsureInBounds(this Point point, Rect bounds)
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83 {
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84 return new Point()
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85 {
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86 X = point.X.EnsureInRange(bounds.X, bounds.Right),
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87 Y = point.Y.EnsureInRange(bounds.Y, bounds.Bottom)
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88 };
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89 }
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90
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91 /// <summary>
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92 /// Ensures that the X-coordinate of the point is in the specified horizontal bounds.
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93 /// </summary>
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94 /// <param name="point">The point.</param>
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95 /// <param name="bounds">The bounds.</param>
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96 /// <returns>Point with the X-coordinate within the boinds.</returns>
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97 public static Point EnsureInHorizontalBounds(this Point point, Rect bounds)
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98 {
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99 return new Point()
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100 {
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101 X = point.X.EnsureInRange(bounds.X, bounds.Right),
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102 Y = point.Y
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103 };
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104 }
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105
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106 /// <summary>
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107 /// Ensures that the Y-coordinate of the point is in the specified vertical bounds.
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108 /// </summary>
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109 /// <param name="point">The point.</param>
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110 /// <param name="bounds">The bounds.</param>
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111 /// <returns>Point with the Y-coordinate within the boinds.</returns>
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112 public static Point EnsureInVerticalBounds(this Point point, Rect bounds)
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113 {
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114 return new Point()
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115 {
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116 X = point.X,
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117 Y = point.Y.EnsureInRange(bounds.Y, bounds.Bottom)
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118 };
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119 }
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120
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121 /// <summary>
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122 /// Determines whether coordinates of the point are Not a Number (NaN).
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123 /// </summary>
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124 /// <param name="point">The point.</param>
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125 /// <returns>
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126 /// <c>true</c> if coordinates are not specified; otherwise, <c>false</c>.
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127 /// </returns>
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128 public static bool IsNotSet(this Point point)
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129 {
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130 return double.IsNaN(point.X) || double.IsNaN(point.Y);
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131 }
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132
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133 /// <summary>
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134 /// Adds an offset to the specified point.
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135 /// </summary>
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136 /// <param name="point">The point.</param>
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137 /// <param name="x">Distance along X-coordinate.</param>
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138 /// <param name="y">Distance along Y-coordinate.</param>
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139 /// <returns>New point.</returns>
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140 public static Point Add(this Point point, double x, double y)
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141 {
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142 return new Point(point.X + x, point.Y + y);
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143 }
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144
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145 /// <summary>
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146 /// Adds an offset specified by the Size to the specified point.
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147 /// </summary>
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148 /// <param name="point">The point.</param>
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149 /// <param name="size">Distance to add.</param>
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150 /// <returns>New point</returns>
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151 public static Point Add(this Point point, Size size)
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152 {
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153 return new Point(point.X + size.Width, point.Y + size.Height);
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154 }
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155
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156 /// <summary>
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157 /// Determines whether dimensions are Not a Number (NaN).
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158 /// </summary>
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159 /// <param name="size">The size.</param>
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160 /// <returns>
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161 /// <c>true</c> if dimensions are not specified; otherwise, <c>false</c>.
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162 /// </returns>
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163 public static bool IsNotSet(this Size size)
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164 {
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165 return double.IsNaN(size.Width) || double.IsNaN(size.Height);
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166 }
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167
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168 /// <summary>
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169 /// Increments size to the specified values.
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170 /// </summary>
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171 /// <param name="size">The size.</param>
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172 /// <param name="x">Increment by X-coordinate.</param>
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173 /// <param name="y">Increment by Y-coordinate.</param>
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174 /// <returns>New size.</returns>
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175 public static Size Add(this Size size, double x, double y)
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176 {
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177 double width = size.Width + x;
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178 double height = size.Height + y;
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179
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180 return new Size()
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181 {
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182 Width = width < 0 ? 0 : width,
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183 Height = height < 0 ? 0 : height
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184 };
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185 }
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186
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187 /// <summary>
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188 /// Increases size if the rectangle to the specified width and height.
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189 /// </summary>
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190 /// <param name="rect">The rectangle.</param>
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191 /// <param name="width">Value to add to the width of the rectangle.</param>
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192 /// <param name="height">Value to add to the height of the rectangle.</param>
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193 /// <returns>New rectangle.</returns>
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194 public static Rect Add(this Rect rect, double width, double height)
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195 {
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196 return new Rect
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197 {
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198 X = rect.X,
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199 Y = rect.Y,
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200 Width = Math.Max(0, rect.Width + width),
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201 Height = Math.Max(0, rect.Height + height)
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202 };
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203 }
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204
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205 /// <summary>
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206 /// Shifts the point to the specified distance.
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207 /// </summary>
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208 /// <param name="point">The point.</param>
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209 /// <param name="distance">The distance.</param>
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210 /// <returns>Point shifted to the specified distance.</returns>
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211 public static Point Add(this Point point, Distance distance)
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212 {
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213 return new Point()
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214 {
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215 X = distance.X.IsNotSet() ? point.X : point.X + distance.X,
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216 Y = distance.Y.IsNotSet() ? point.Y : point.Y + distance.Y
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217 };
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218 }
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219
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220 /// <summary>
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221 /// Tests whether the rectangle overlaps with another one vertically.
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222 /// </summary>
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223 /// <param name="rect">The rectangle.</param>
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224 /// <param name="testRect">Test rectangle.</param>
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225 /// <param name="accuracy">Accuracy.</param>
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226 /// <returns><c>true</c> if overlaps vertically; otherwise, <c>false</c>.</returns>
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227 public static bool OverlapsVertically(this Rect rect, Rect testRect, double accuracy = 0)
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228 {
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229 double y1 = rect.Y + rect.Height - 1;
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230 double y2 = testRect.Y + testRect.Height - 1;
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231
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232 if (rect.Y <= testRect.Y)
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233 {
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234 return y1 >= (testRect.Y - accuracy);
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235 }
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236 else if (rect.Y <= (y2 + accuracy))
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237 {
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238 return true;
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239 }
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240
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241 return false;
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242 }
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243
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244 /// <summary>
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245 /// Tests whether the rectangle overlaps with another one horizontally.
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246 /// </summary>
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247 /// <param name="rect">The rectangle.</param>
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248 /// <param name="testRect">Test rectangle.</param>
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249 /// <param name="accuracy">Accuracy.</param>
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250 /// <returns><c>true</c> if overlaps horizontally; otherwise, <c>false</c>.</returns>
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251 public static bool OverlapsHorizontally(this Rect rect, Rect testRect, double accuracy = 0)
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252 {
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253 double x1 = rect.X + rect.Width - 1;
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254 double x2 = testRect.X + testRect.Width - 1;
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255
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256 if (rect.X <= testRect.X)
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257 {
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258 return x1 >= (testRect.X - accuracy);
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259 }
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260 else if (rect.X <= (x2 + accuracy))
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261 {
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262 return true;
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263 }
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264
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265 return false;
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266 }
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267
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268 /// <summary>
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269 /// Tests whether the point overlaps with the rectangle vertically.
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270 /// </summary>
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271 /// <param name="point">Test point.</param>
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272 /// <param name="rect">Test rectangle.</param>
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273 /// <param name="accuracy">Accuracy.</param>
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274 /// <returns><c>true</c> if overlaps vertically; otherwise, <c>false</c>.</returns>
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275 public static bool OverlapsVertically(this Point point, Rect rect, double accuracy = 0)
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276 {
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277 return (point.Y >= (rect.Y - accuracy) && point.Y <= (rect.Y + rect.Height - 1 + accuracy));
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278 }
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279
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280 /// <summary>
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281 /// Tests whether the point overlaps with the rectangle horizontally.
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282 /// </summary>
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283 /// <param name="point">Test point.</param>
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284 /// <param name="rect">Test rectangle.</param>
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285 /// <param name="accuracy">Accuracy.</param>
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286 /// <returns><c>true</c> if overlaps horizontally; otherwise, <c>false</c>.</returns>
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287 public static bool OverlapsHorizontally(this Point point, Rect rect, double accuracy = 0)
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288 {
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289 return (point.X >= (rect.X - accuracy) && point.X <= (rect.X + rect.Width - 1 + accuracy));
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290 }
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291 }
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292 }