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annotate MetroWpf/MetroWpf.Xaml/Converters/AngleToCoordinateConverter.cs @ 121:8f94475d3146 tip

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final code
author stevenh7776
date Thu, 31 May 2012 15:35:26 +0100
parents 060f02cd4591
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15
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1 using System;
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2 using System.Diagnostics.Contracts;
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3 using System.Globalization;
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4 using System.Windows;
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5 using System.Windows.Data;
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6
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7 namespace MetroWpf.Xaml.Converters
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8 {
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9 public sealed class AngleToCoordinateConverter : IMultiValueConverter
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10 {
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11 public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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12 {
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13 if (values == null || values.Length < 4)
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14 {
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15 return DependencyProperty.UnsetValue;
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16 }
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17
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18 var fallbackValue = values[0];
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19 if (!(values[1] is double) || !(values[2] is double) || !(values[3] is double))
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20 {
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21 return fallbackValue;
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22 }
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23 var angle = (double)values[1];
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24 if (angle < 0.0)
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25 {
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26 return fallbackValue;
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27 }
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28 var areaWidth = (double)values[2];
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29 var areaHeight = (double)values[3];
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30
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31 var width = values.Length > 4 ? (values[4] is double ? (double)values[4] : 0.0) : 0.0;
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32 var height = values.Length > 5 ? (values[5] is double ? (double)values[5] : 0.0) : 0.0;
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33 var radiusXCoordinate = values.Length > 6 ? (values[5] is double ? (double)values[5] : 0.0) : areaWidth / 2;
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34 var radiusYCoordinate = values.Length > 7 ? (values[6] is double ? (double)values[6] : 0.0) : areaHeight / 2;
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35
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36 var length = Math.Max(width, height);
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37 var radius = Math.Min(areaWidth / 2, areaHeight / 2) - length;
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38
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39 switch (parameter as string)
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40 {
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41 case "X":
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42 case "x":
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43 var x = radiusXCoordinate + radius * Math.Cos(angle * Math.PI / 180);
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44 return x;
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45 case "Y":
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46 case "y":
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47 var y = radiusYCoordinate + radius * Math.Sin(angle * Math.PI / 180);
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48 return y;
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49 default:
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50 return fallbackValue;
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51 }
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52 }
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53
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54 public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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55 {
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56 Contract.Ensures(false);
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57 throw new NotSupportedException();
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58 }
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59 }
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60 } ;