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Former-commit-id: 8398b8040c34efcd206c1d902eb0f08f159bcac3 Former-commit-id: 4c06003d8958c521d87280269187171870d2801baf/merge-core
James South
11 years ago
9 changed files with 186 additions and 11 deletions
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="ReplaceColor.cs" company="James South">
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// Copyright (c) James South.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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// <summary>
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// Encapsulates methods allowing the replacement of a color within an image.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Web.Processors |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.Drawing; |
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using System.Globalization; |
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using System.Linq; |
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using System.Text; |
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using System.Text.RegularExpressions; |
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using ImageProcessor.Processors; |
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using ImageProcessor.Web.Helpers; |
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/// <summary>
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/// Encapsulates methods allowing the replacement of a color within an image.
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/// </summary>
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public class ReplaceColor : IWebGraphicsProcessor |
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{ |
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/// <summary>
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/// The regular expression to search strings for.
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/// </summary>
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private static readonly Regex QueryRegex = new Regex(@"(replace=|fuzziness=)[^&]+", RegexOptions.Compiled); |
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/// <summary>
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/// The replace regex.
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/// </summary>
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private static readonly Regex ReplaceRegex = new Regex(@"replace=[^&]+", RegexOptions.Compiled); |
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/// <summary>
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/// The fuzz regex.
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/// </summary>
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private static readonly Regex FuzzRegex = new Regex(@"fuzziness=\d+", RegexOptions.Compiled); |
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/// <summary>
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/// Initializes a new instance of the <see cref="ReplaceColor"/> class.
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/// </summary>
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public ReplaceColor() |
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{ |
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this.Processor = new ImageProcessor.Processors.ReplaceColor(); |
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} |
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/// <summary>
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/// Gets the regular expression to search strings for.
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/// </summary>
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public Regex RegexPattern |
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{ |
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get |
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{ |
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return QueryRegex; |
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} |
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} |
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/// <summary>
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/// Gets the order in which this processor is to be used in a chain.
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/// </summary>
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public int SortOrder { get; private set; } |
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/// <summary>
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/// Gets the associated graphics processor.
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/// </summary>
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public IGraphicsProcessor Processor { get; private set; } |
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/// <summary>
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/// The position in the original string where the first character of the captured substring was found.
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/// </summary>
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/// <param name="queryString">The query string to search.</param>
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/// <returns>
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/// The zero-based starting position in the original string where the captured substring was found.
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/// </returns>
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public int MatchRegexIndex(string queryString) |
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{ |
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int index = 0; |
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// Set the sort order to max to allow filtering.
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this.SortOrder = int.MaxValue; |
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// First merge the matches so we can parse .
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StringBuilder stringBuilder = new StringBuilder(); |
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foreach (Match match in this.RegexPattern.Matches(queryString)) |
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{ |
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if (match.Success) |
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{ |
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if (index == 0) |
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{ |
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// Set the index on the first instance only.
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this.SortOrder = match.Index; |
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} |
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stringBuilder.Append(match.Value); |
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index += 1; |
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} |
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} |
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if (this.SortOrder < int.MaxValue) |
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{ |
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// Match syntax
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string toParse = stringBuilder.ToString(); |
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Color[] colors = this.ParseColor(toParse); |
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int fuzziness = this.ParseFuzziness(toParse); |
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this.Processor.DynamicParameter = new Tuple<Color, Color, int>(colors[0], colors[1], fuzziness); |
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} |
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return this.SortOrder; |
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} |
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/// <summary>
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/// Returns the angle to alter the hue.
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/// </summary>
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/// <param name="input">
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/// The input containing the value to parse.
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/// </param>
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/// <returns>
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/// The <see cref="int"/> representing the angle.
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/// </returns>
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public Color[] ParseColor(string input) |
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{ |
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IEnumerable<Color> colors = Enumerable.Empty<Color>(); |
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Match match = ReplaceRegex.Match(input); |
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if (match.Success) |
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{ |
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string[] colorQuery = match.Value.Split('=')[1].Split('|'); |
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colors = colorQuery.Select(CommonParameterParserUtility.ParseColor); |
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} |
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return colors.ToArray(); |
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} |
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/// <summary>
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/// Returns the angle to alter the hue.
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/// </summary>
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/// <param name="input">
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/// The input containing the value to parse.
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/// </param>
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/// <returns>
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/// The <see cref="int"/> representing the angle.
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/// </returns>
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public int ParseFuzziness(string input) |
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{ |
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int fuzziness = 0; |
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Match match = FuzzRegex.Match(input); |
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if (match.Success) |
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{ |
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fuzziness = int.Parse(match.Value.Split('=')[1], CultureInfo.InvariantCulture); |
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} |
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return Math.Max(0, Math.Min(100, fuzziness)); |
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} |
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} |
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} |
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