mcs/class/referencesource/System.Web.DataVisualization/WebForm/Converters/MapAreaCoordinatesConverter.cs

   1 //-------------------------------------------------------------
   2 // <copyright company=’Microsoft Corporation’>
   3 //   Copyright © Microsoft Corporation. All Rights Reserved.
   4 // </copyright>
   5 //-------------------------------------------------------------
   6 // @owner=alexgor, deliant
   7 //=================================================================
   8 //  File:               MapAreaCoordinatesConverter.cs
   9 //
  10 //  Namespace:  System.Web.UI.DataVisualization.Charting
  11 //
  12 //      Classes:        MapAreaCoordinatesConverter
  13 //
  14 //  Purpose:    Design-time converter for map area coordinates
  15 //
  16 //      Reviewed:       AG - August 7, 2002
  17 //
  18 //===================================================================
  19
  20 using System.ComponentModel;
  21 using System.Globalization;
  22
  23 namespace System.Web.UI.DataVisualization.Charting
  24 {
  25     /// <summary>
  26     /// Converter for the array of map area coordinates
  27     /// </summary>
  28     internal class MapAreaCoordinatesConverter : ArrayConverter
  29     {
  30         /// <summary>
  31         /// Overrides the CanConvertFrom method of TypeConverter.
  32         /// The ITypeDescriptorContext interface provides the context for the
  33         /// conversion. Typically this interface is used at design time to
  34         /// provide information about the design-time container.
  35         /// </summary>
  36         /// <param name="context">Descriptor context.</param>
  37         /// <param name="sourceType">Convertion source type.</param>
  38         /// <returns>Indicates if convertion is possible.</returns>
  39         public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
  40         {
  41             if (sourceType == typeof(string))
  42             {
  43                 return true;
  44             }
  45             return base.CanConvertFrom(context, sourceType);
  46         }
  47
  48         /// <summary>
  49         /// Overrides the ConvertFrom method of TypeConverter.
  50         /// Convert from comma separated values in the string.
  51         /// </summary>
  52         /// <param name="context">Descriptor context.</param>
  53         /// <param name="culture">Culture information.</param>
  54         /// <param name="value">Value to convert from.</param>
  55         /// <returns>Indicates if convertion is possible.</returns>
  56         public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
  57         {
  58             // Can convert from string where each array element is separated by comma
  59             string stringValue = value as string;
  60             if (stringValue != null)
  61             {
  62                 string[] values = stringValue.Split(new char[] { ',' });
  63                 float[] array = new float[values.Length];
  64                 for (int index = 0; index < values.Length; index++)
  65                 {
  66                     array[index] = float.Parse(values[index], System.Globalization.CultureInfo.CurrentCulture);
  67                 }
  68
  69                 return array;
  70             }
  71
  72             // Call base class
  73             return base.ConvertFrom(context, culture, value);
  74         }
  75
  76         /// <summary>
  77         /// Overrides the ConvertTo method of TypeConverter.
  78         /// Convert coordinates array to comma separated values in string.
  79         /// </summary>
  80         /// <param name="context">Descriptor context.</param>
  81         /// <param name="culture">Culture information.</param>
  82         /// <param name="value">Value to convert.</param>
  83         /// <param name="destinationType">Convertion destination type.</param>
  84         /// <returns>Converted object.</returns>
  85         public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
  86         {
  87             if (destinationType == typeof(string))
  88             {
  89                 float[] array = (float[])value;
  90                 string result = "";
  91
  92                 foreach (float d in array)
  93                 {
  94                     result += d.ToString(System.Globalization.CultureInfo.CurrentCulture) + ",";
  95                 }
  96
  97                 return result.TrimEnd(',');
  98             }
  99
 100             return base.ConvertTo(context, culture, value, destinationType);
 101         }
 102     }
 103 }