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annotate Chronosv2/source/Extensions/BitmapExtensions.cs @ 10:443821e55f06

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author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
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10
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1 using System;
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2 using System.Drawing;
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3 using System.Drawing.Drawing2D;
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4
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5 namespace Chronos.Extensions
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6 {
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7 /// <summary>
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8 /// Extension methods for the System.Drawing.Bitmap class
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9 /// </summary>
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10 public static class BitmapExtensions
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11 {
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12 #region · Extensions ·
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13
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14 /// <summary>
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15 /// Scales the bitmap to the passed target size without respecting the aspect.
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16 /// </summary>
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17 /// <param name="bitmap">The source bitmap.</param>
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18 /// <param name="size">The target size.</param>
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19 /// <returns>The scaled bitmap</returns>
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20 /// <example><code>
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21 /// var bitmap = new Bitmap("image.png");
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22 /// var thumbnail = bitmap.ScaleToSize(100, 100);
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23 /// </code></example>
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24 public static Bitmap ScaleToSize(this Bitmap bitmap, Size size)
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25 {
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26 return bitmap.ScaleToSize(size.Width, size.Height);
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27 }
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28
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29 /// <summary>
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30 /// Scales the bitmap to the passed target size without respecting the aspect.
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31 /// </summary>
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32 /// <param name="bitmap">The source bitmap.</param>
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33 /// <param name="width">The target width.</param>
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34 /// <param name="height">The target height.</param>
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35 /// <returns>The scaled bitmap</returns>
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36 /// <example><code>
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37 /// var bitmap = new Bitmap("image.png");
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38 /// var thumbnail = bitmap.ScaleToSize(100, 100);
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39 /// </code></example>
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40 public static Bitmap ScaleToSize(this Bitmap bitmap, int width, int height)
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41 {
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42 var scaledBitmap = new Bitmap(width, height);
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43
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44 using (var g = Graphics.FromImage(scaledBitmap))
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45 {
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46 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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47 g.DrawImage(bitmap, 0, 0, width, height);
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48 }
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49
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50 return scaledBitmap;
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51 }
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52
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53 /// <summary>
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54 /// Scales the bitmap to the passed target size by respecting the aspect.
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55 /// </summary>
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56 /// <param name="bitmap">The source bitmap.</param>
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57 /// <param name="size">The target size.</param>
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58 /// <returns>The scaled bitmap</returns>
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59 /// <example><code>
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60 /// var bitmap = new Bitmap("image.png");
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61 /// var thumbnail = bitmap.ScaleProportional(100, 100);
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62 /// </code></example>
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63 /// <remarks>Please keep in mind that the returned bitmaps size might not match the desired size due to original bitmaps aspect.</remarks>
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64 public static Bitmap ScaleProportional(this Bitmap bitmap, Size size)
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65 {
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66 return bitmap.ScaleProportional(size.Width, size.Height);
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67 }
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68
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69 /// <summary>
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70 /// Scales the bitmap to the passed target size by respecting the aspect.
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71 /// </summary>
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72 /// <param name="bitmap">The source bitmap.</param>
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73 /// <param name="width">The target width.</param>
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74 /// <param name="height">The target height.</param>
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75 /// <returns>The scaled bitmap</returns>
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76 /// <example><code>
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77 /// var bitmap = new Bitmap("image.png");
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78 /// var thumbnail = bitmap.ScaleProportional(100, 100);
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79 /// </code></example>
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80 /// <remarks>Please keep in mind that the returned bitmaps size might not match the desired size due to original bitmaps aspect.</remarks>
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81 public static Bitmap ScaleProportional(this Bitmap bitmap, int width, int height)
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82 {
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83 float proportionalWidth, proportionalHeight;
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84
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85 if (width.Equals(0))
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86 {
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87 proportionalWidth = ((float)height) / bitmap.Size.Height * bitmap.Width;
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88 proportionalHeight = height;
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89 }
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90 else if (height.Equals(0))
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91 {
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92 proportionalWidth = width;
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93 proportionalHeight = ((float)width) / bitmap.Size.Width * bitmap.Height;
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94 }
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95 else if (((float)width) / bitmap.Size.Width * bitmap.Size.Height <= height)
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96 {
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97 proportionalWidth = width;
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98 proportionalHeight = ((float)width) / bitmap.Size.Width * bitmap.Height;
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99 }
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100 else
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101 {
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102 proportionalWidth = ((float)height) / bitmap.Size.Height * bitmap.Width;
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103 proportionalHeight = height;
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104 }
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105
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106 return bitmap.ScaleToSize((int)proportionalWidth, (int)proportionalHeight);
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107 }
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108
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109 /// <summary>
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110 /// Scales the bitmap to the passed target size by respecting the aspect. The overlapping background is filled with the given background color.
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111 /// </summary>
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112 /// <param name="bitmap">The source bitmap.</param>
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113 /// <param name="size">The target size.</param>
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114 /// <returns>The scaled bitmap</returns>
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115 /// <example><code>
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116 /// var bitmap = new Bitmap("image.png");
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117 /// var thumbnail = bitmap.ScaleToSizeProportional(100, 100);
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118 /// </code></example>
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119 public static Bitmap ScaleToSizeProportional(this Bitmap bitmap, Size size)
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120 {
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121 return bitmap.ScaleToSizeProportional(Color.White, size);
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122 }
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123
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124 /// <summary>
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125 /// Scales the bitmap to the passed target size by respecting the aspect. The overlapping background is filled with the given background color.
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126 /// </summary>
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127 /// <param name="bitmap">The source bitmap.</param>
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128 /// <param name="backgroundColor">The color of the background.</param>
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129 /// <param name="size">The target size.</param>
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130 /// <returns>The scaled bitmap</returns>
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131 /// <example><code>
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132 /// var bitmap = new Bitmap("image.png");
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133 /// var thumbnail = bitmap.ScaleToSizeProportional(100, 100);
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134 /// </code></example>
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135 public static Bitmap ScaleToSizeProportional(this Bitmap bitmap, Color backgroundColor, Size size)
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136 {
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137 return bitmap.ScaleToSizeProportional(backgroundColor, size.Width, size.Height);
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138 }
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139
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140 /// <summary>
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141 /// Scales the bitmap to the passed target size by respecting the aspect. The overlapping background is filled with the given background color.
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142 /// </summary>
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143 /// <param name="bitmap">The source bitmap.</param>
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144 /// <param name="width">The target width.</param>
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145 /// <param name="height">The target height.</param>
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146 /// <returns>The scaled bitmap</returns>
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147 /// <example><code>
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148 /// var bitmap = new Bitmap("image.png");
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149 /// var thumbnail = bitmap.ScaleToSizeProportional(100, 100);
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150 /// </code></example>
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151 public static Bitmap ScaleToSizeProportional(this Bitmap bitmap, int width, int height)
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152 {
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153 return bitmap.ScaleToSizeProportional(Color.White, width, height);
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154 }
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155
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156 /// <summary>
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157 /// Scales the bitmap to the passed target size by respecting the aspect. The overlapping background is filled with the given background color.
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158 /// </summary>
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159 /// <param name="bitmap">The source bitmap.</param>
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160 /// <param name="backgroundColor">The color of the background.</param>
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161 /// <param name="width">The target width.</param>
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162 /// <param name="height">The target height.</param>
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163 /// <returns>The scaled bitmap</returns>
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164 /// <example><code>
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165 /// var bitmap = new Bitmap("image.png");
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166 /// var thumbnail = bitmap.ScaleToSizeProportional(100, 100);
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167 /// </code></example>
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168 public static Bitmap ScaleToSizeProportional(this Bitmap bitmap, Color backgroundColor, int width, int height)
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169 {
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170 var scaledBitmap = new Bitmap(width, height);
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171 using (var g = Graphics.FromImage(scaledBitmap))
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172 {
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173 g.Clear(backgroundColor);
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174
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175 var proportionalBitmap = bitmap.ScaleProportional(width, height);
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176
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177 var imagePosition = new Point
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178 (
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179 (int)((width - proportionalBitmap.Width) / 2m),
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180 (int)((height - proportionalBitmap.Height) / 2m)
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181 );
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182
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183 g.DrawImage(proportionalBitmap, imagePosition);
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184 }
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185
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186 return scaledBitmap;
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187 }
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188
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189 #endregion
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190 }
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191 }