Added new percentile based cropping system

Former-commit-id: c50657927da59f8acc381780e18e50750f511a3b

src/ImageProcessor/Extensions/StringExtensions.cs

@@ -123,7 +123,7 @@ namespace ImageProcessor.Extensions
                 throw new ArgumentNullException("expression");
             }
 
-            Regex regex = new Regex(@"\d+", RegexOptions.Compiled);
+            Regex regex = new Regex(@"[\d+]+(?=[,|])|[\d+]+(?![,|])", RegexOptions.Compiled);
 
             MatchCollection matchCollection = regex.Matches(expression);
 
@@ -139,6 +139,35 @@ namespace ImageProcessor.Extensions
 
             return matches;
         }
+
+        /// <summary>
+        /// Creates an array of floats scraped from the String.
+        /// </summary>
+        /// <param name="expression">The <see cref="T:System.String">String</see> instance that this method extends.</param>
+        /// <returns>An array of floats scraped from the String.</returns>
+        public static float[] ToPositiveFloatArray(this string expression)
+        {
+            if (string.IsNullOrWhiteSpace(expression))
+            {
+                throw new ArgumentNullException("expression");
+            }
+
+            Regex regex = new Regex(@"[\d+\.]+(?=[,|])|[\d+\.]+(?![,|])", RegexOptions.Compiled);
+
+            MatchCollection matchCollection = regex.Matches(expression);
+
+            // Get the collections.
+            int count = matchCollection.Count;
+            float[] matches = new float[count];
+
+            // Loop and parse the int values.
+            for (int i = 0; i < count; i++)
+            {
+                matches[i] = float.Parse(matchCollection[i].Value);
+            }
+
+            return matches;
+        }
         #endregion
 
         #region Files and Paths

src/ImageProcessor/ImageFactory.cs

@@ -395,7 +395,30 @@ namespace ImageProcessor
         {
             if (this.ShouldProcess)
             {
-                Crop crop = new Crop { DynamicParameter = rectangle };
+                CropLayer cropLayer = new CropLayer(rectangle.Left, rectangle.Top, rectangle.Right, rectangle.Bottom, CropMode.Pixels);
+
+                Crop crop = new Crop { DynamicParameter = cropLayer };
+
+                this.Image = crop.ProcessImage(this);
+            }
+
+            return this;
+        }
+
+        /// <summary>
+        /// Crops the current image to the given location and size.
+        /// </summary>
+        /// <param name="cropLayer">
+        /// The <see cref="T:CropLayer"/> containing the coordinates and mode to crop the image with.
+        /// </param>
+        /// <returns>
+        /// The current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
+        /// </returns>
+        public ImageFactory Crop(CropLayer cropLayer)
+        {
+            if (this.ShouldProcess)
+            {
+                Crop crop = new Crop { DynamicParameter = cropLayer };
 
                 this.Image = crop.ProcessImage(this);
             }

src/ImageProcessor/ImageProcessor.csproj

@@ -66,6 +66,8 @@
     <Compile Include="ImageFactory.cs" />
     <Compile Include="Imaging\AnchorPosition.cs" />
     <Compile Include="Imaging\Convolution.cs" />
+    <Compile Include="Imaging\CropLayer.cs" />
+    <Compile Include="Imaging\CropMode.cs" />
     <Compile Include="Imaging\GaussianLayer.cs" />
     <Compile Include="Imaging\ColorQuantizer.cs" />
     <Compile Include="Imaging\ResizeLayer.cs" />

src/ImageProcessor/Imaging/CropLayer.cs

@@ -0,0 +1,81 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="CropLayer.cs" company="James South">
+//   Copyright (c) James South.
+//   Licensed under the Apache License, Version 2.0.
+// </copyright>
+// <summary>
+//   Encapsulates the properties required to crop an image.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace ImageProcessor.Imaging
+{
+    using System;
+
+    /// <summary>
+    /// Encapsulates the properties required to crop an image.
+    /// </summary>
+    public class CropLayer
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CropLayer"/> class.
+        /// </summary>
+        /// <param name="left">
+        /// The left coordinate of the crop layer.
+        /// </param>
+        /// <param name="top">
+        /// The top coordinate of the crop layer.
+        /// </param>
+        /// <param name="right">
+        /// The right coordinate of the crop layer.
+        /// </param>
+        /// <param name="bottom">
+        /// The bottom coordinate of the crop layer.
+        /// </param>
+        /// <param name="cropMode">
+        /// The <see cref="CropMode"/>.
+        /// </param>
+        /// <remarks>
+        /// If the <see cref="CropMode"/> is set to <value>CropMode.Percentage</value> then the four coordinates
+        /// become percentages to reduce from each edge.
+        /// </remarks>
+        public CropLayer(float left, float top, float right, float bottom, CropMode cropMode = CropMode.Percentage)
+        {
+            if (left < 0 || top < 0 || right < 0 || bottom < 0)
+            {
+                throw new ArgumentOutOfRangeException();
+            }
+
+            this.Left = left;
+            this.Top = top;
+            this.Right = right;
+            this.Bottom = bottom;
+            this.CropMode = cropMode;
+        }
+
+        /// <summary>
+        /// Gets or sets the left coordinate of the crop layer.
+        /// </summary>
+        public float Left { get; set; }
+
+        /// <summary>
+        /// Gets or sets the top coordinate of the crop layer.
+        /// </summary>
+        public float Top { get; set; }
+
+        /// <summary>
+        /// Gets or sets the right coordinate of the crop layer.
+        /// </summary>
+        public float Right { get; set; }
+
+        /// <summary>
+        /// Gets or sets the bottom coordinate of the crop layer.
+        /// </summary>
+        public float Bottom { get; set; }
+
+        /// <summary>
+        /// Gets or sets the <see cref="CropMode"/>.
+        /// </summary>
+        public CropMode CropMode { get; set; }
+    }
+}

src/ImageProcessor/Imaging/CropMode.cs

@@ -0,0 +1,28 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="CropMode.cs" company="James South">
+//   Copyright (c) James South.
+//   Licensed under the Apache License, Version 2.0.
+// </copyright>
+// <summary>
+//   Enumerated cop modes to apply to cropped images.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace ImageProcessor.Imaging
+{
+    /// <summary>
+    /// Enumerated cop modes to apply to cropped images.
+    /// </summary>
+    public enum CropMode
+    {
+        /// <summary>
+        /// Crops the image using the standard rectangle model of x, y, width, height.
+        /// </summary>
+        Pixels,
+
+        /// <summary>
+        /// Crops the image using percentages model left, top, right, bottom.
+        /// </summary>
+        Percentage
+    }
+}

src/ImageProcessor/Processors/Crop.cs

@@ -15,9 +15,11 @@ namespace ImageProcessor.Processors
     using System.Drawing;
     using System.Drawing.Drawing2D;
     using System.Drawing.Imaging;
+    using System.Text;
     using System.Text.RegularExpressions;
 
     using ImageProcessor.Extensions;
+    using ImageProcessor.Imaging;
 
     #endregion
 
@@ -30,7 +32,17 @@ namespace ImageProcessor.Processors
         /// The regular expression to search strings for.
         /// <see cref="http://stackoverflow.com/a/6400969/427899"/>
         /// </summary>
-        private static readonly Regex QueryRegex = new Regex(@"crop=\d+[,-]\d+[,-]\d+[,-]\d+", RegexOptions.Compiled);
+        private static readonly Regex QueryRegex = new Regex(@"crop=\d+(.\d+)?[,-]\d+(.\d+)?[,-]\d+(.\d+)?[,-]\d+(.\d+)?|cropmode=(pixels|percent)", RegexOptions.Compiled);
+
+        /// <summary>
+        /// The coordinate regex.
+        /// </summary>
+        private static readonly Regex CoordinateRegex = new Regex(@"crop=\d+(.\d+)?[,-]\d+(.\d+)?[,-]\d+(.\d+)?[,-]\d+(.\d+)?", RegexOptions.Compiled);
+
+        /// <summary>
+        /// The mode regex.
+        /// </summary>
+        private static readonly Regex ModeRegex = new Regex(@"cropmode=(pixels|percent)", RegexOptions.Compiled);
 
         #region IGraphicsProcessor Members
         /// <summary>
@@ -87,6 +99,9 @@ namespace ImageProcessor.Processors
             // Set the sort order to max to allow filtering.
             this.SortOrder = int.MaxValue;
 
+            // First merge the matches so we can parse .
+            StringBuilder stringBuilder = new StringBuilder();
+
             foreach (Match match in this.RegexPattern.Matches(queryString))
             {
                 if (match.Success)
@@ -95,21 +110,26 @@ namespace ImageProcessor.Processors
                     {
                         // Set the index on the first instance only.
                         this.SortOrder = match.Index;
-                        int[] coordinates = match.Value.ToPositiveIntegerArray();
-
-                        int x = coordinates[0];
-                        int y = coordinates[1];
-                        int width = coordinates[2];
-                        int height = coordinates[3];
-
-                        Rectangle rectangle = new Rectangle(x, y, width, height);
-                        this.DynamicParameter = rectangle;
                     }
 
+                    stringBuilder.Append(match.Value);
+
                     index += 1;
                 }
             }
 
+            if (this.SortOrder < int.MaxValue)
+            {
+                // Match syntax
+                string toParse = stringBuilder.ToString();
+
+                float[] coordinates = this.ParseCoordinates(toParse);
+                CropMode cropMode = this.ParseMode(toParse);
+
+                CropLayer cropLayer = new CropLayer(coordinates[0], coordinates[1], coordinates[2], coordinates[3], cropMode);
+                this.DynamicParameter = cropLayer;
+            }
+
             return this.SortOrder;
         }
 
@@ -129,10 +149,27 @@ namespace ImageProcessor.Processors
             Image image = factory.Image;
             try
             {
-                Rectangle rectangle = this.DynamicParameter;
-
                 int sourceWidth = image.Width;
                 int sourceHeight = image.Height;
+                RectangleF rectangleF;
+                CropLayer cropLayer = this.DynamicParameter;
+
+                if (cropLayer.CropMode == CropMode.Percentage)
+                {
+                    // Work out the percentages.
+                    float left = cropLayer.Left * sourceWidth;
+                    float top = cropLayer.Top * sourceWidth;
+                    float right = (sourceWidth - (cropLayer.Right * sourceWidth)) - left;
+                    float bottom = (sourceHeight - (cropLayer.Bottom * sourceHeight)) - top;
+
+                    rectangleF = new RectangleF(left, top, right, bottom);
+                }
+                else
+                {
+                    rectangleF = new RectangleF(cropLayer.Left, cropLayer.Top, cropLayer.Right, cropLayer.Bottom);
+                }
+
+                Rectangle rectangle = Rectangle.Round(rectangleF);
 
                 if (rectangle.X < sourceWidth && rectangle.Y < sourceHeight)
                 {
@@ -190,5 +227,55 @@ namespace ImageProcessor.Processors
             return image;
         }
         #endregion
+
+        /// <summary>
+        /// Returns the correct <see cref="CropMode"/> for the given string.
+        /// </summary>
+        /// <param name="input">
+        /// The input string containing the value to parse.
+        /// </param>
+        /// <returns>
+        /// The correct <see cref="CropMode"/>.
+        /// </returns>
+        private CropMode ParseMode(string input)
+        {
+            foreach (Match match in ModeRegex.Matches(input))
+            {
+                // Split on =
+                string mode = match.Value.Split('=')[1];
+
+                switch (mode)
+                {
+                    case "percent":
+                        return CropMode.Percentage;
+                    case "pixels":
+                        return CropMode.Pixels;
+                }
+            }
+
+            return CropMode.Pixels;
+        }
+
+
+        /// <summary>
+        /// Returns the correct <see cref="CropMode"/> for the given string.
+        /// </summary>
+        /// <param name="input">
+        /// The input string containing the value to parse.
+        /// </param>
+        /// <returns>
+        /// The correct <see cref="CropMode"/>.
+        /// </returns>
+        private float[] ParseCoordinates(string input)
+        {
+            float[] floats = { };
+
+            foreach (Match match in CoordinateRegex.Matches(input))
+            {
+                floats = match.Value.ToPositiveFloatArray();
+            }
+
+            return floats;
+        }
     }
 }

src/ImageProcessor/Processors/Resize.cs

@@ -59,6 +59,7 @@ namespace ImageProcessor.Processors
         /// The regular expression to search strings for the upscale attribute.
         /// </summary>
         private static readonly Regex UpscaleRegex = new Regex(@"upscale=false", RegexOptions.Compiled);
+
         #region IGraphicsProcessor Members
         /// <summary>
         /// Gets the regular expression to search strings for.

src/TestWebsites/NET45/Test_Website_NET45/Views/Home/Index.cshtml

@@ -14,7 +14,11 @@
             </div>
             <div class="col-s-6">
                 <h2>Cropped </h2>
-                <img src="/images/Penguins.jpg?crop=0-0-300-225" />
+                <img src="/images/Penguins.jpg?crop=0,0,300,225" />
+
+                <h3>Cropped Percent</h3>
+                <img src="/images/Penguins.jpg?width=300&height300&crop=0.1,0.2,0.1,0.6&cropmode=percent" />
+
             </div>
         </div>
     </section>
@@ -185,17 +189,17 @@
 <article>
     <h1>Color Profiles</h1>
     @*    <section>
-        <div class="row">
-            <div class="col-s-6">
-                <h2>CMYK original jpg</h2>
-                <img src="/images/cmyk.jpg?" width="400" />
-            </div>
-            <div class="col-s-6">
-                <h2>sRGB original jpg</h2>
-                <img src="/images/srgb.jpg?" width="400" />
-            </div>
-        </div>
-    </section>*@
+            <div class="row">
+                <div class="col-s-6">
+                    <h2>CMYK original jpg</h2>
+                    <img src="/images/cmyk.jpg?" width="400" />
+                </div>
+                <div class="col-s-6">
+                    <h2>sRGB original jpg</h2>
+                    <img src="/images/srgb.jpg?" width="400" />
+                </div>
+            </div>
+        </section>*@
     <section>
         <div class="row">
             <div class="col-s-6">