wehub-resource-sync
85 lines
3.3 KiB
C#
85 lines
3.3 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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using System;
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using System.Drawing;
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using System.Globalization;
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using Newtonsoft.Json;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// A <see cref="JsonConverter" /> implementation that serializes a <see cref="Color" /> as a string.
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/// If Color is empty, string is also empty and vice-versa. Meaning that color is autogen.
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/// </summary>
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public class ColorJsonConverter : TypeChangeJsonConverter<Color, string>
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{
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/// <summary>
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/// Converts a .NET Color to a hexadecimal as a string
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/// </summary>
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/// <param name="value">The input value to be converted before serialization</param>
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/// <returns>Hexadecimal number as a string. If .NET Color is null, returns default #000000</returns>
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protected override string Convert(Color value)
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{
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return value.IsEmpty ? string.Empty : $"#{value.R.ToStringInvariant("X2")}{value.G.ToStringInvariant("X2")}{value.B.ToStringInvariant("X2")}";
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}
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/// <summary>
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/// Converts the input string to a .NET Color object
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/// </summary>
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/// <param name="value">The deserialized value that needs to be converted to T</param>
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/// <returns>The converted value</returns>
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protected override Color Convert(string value)
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{
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if (string.IsNullOrWhiteSpace(value))
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{
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return Color.Empty;
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}
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if (value.Length != 7)
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{
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var message = $"Unable to convert '{value}' to a Color. Requires string length of 7 including the leading hashtag.";
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throw new FormatException(message);
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}
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var red = HexToInt(value.Substring(1, 2));
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var green = HexToInt(value.Substring(3, 2));
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var blue = HexToInt(value.Substring(5, 2));
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return Color.FromArgb(red, green, blue);
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}
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/// <summary>
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/// Converts hexadecimal number to integer
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/// </summary>
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/// <param name="hexValue">Hexadecimal number</param>
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/// <returns>Integer representation of the hexadecimal</returns>
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private int HexToInt(string hexValue)
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{
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if (hexValue.Length != 2)
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{
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var message = $"Unable to convert '{hexValue}' to an Integer. Requires string length of 2.";
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throw new FormatException(message);
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}
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int result;
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if (!int.TryParse(hexValue, NumberStyles.HexNumber, null, out result))
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{
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throw new FormatException($"Invalid hex number: {hexValue}");
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}
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return result;
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}
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}
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} |