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annotate SilverlightGlimpse/SilverFlow.Controls/Extensions/MathExtensions.cs @ 64:ba89e36631bc

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Latest version
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sun, 22 Apr 2012 14:20:52 +0100
parents 536498832a79
children
rev   line source
63
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1 using System;
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2
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3 namespace SilverFlow.Controls.Extensions
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4 {
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5 /// <summary>
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6 /// Math extensions
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7 /// </summary>
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8 public static class MathExtensions
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9 {
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10 /// <summary>
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11 /// Determines whether the number is NaN.
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12 /// </summary>
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13 /// <param name="number">The number.</param>
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14 /// <returns>
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15 /// <c>true</c> if is NaN; otherwise, <c>false</c>.
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16 /// </returns>
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17 public static bool IsNotSet(this double number)
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18 {
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19 return double.IsNaN(number);
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20 }
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21
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22 /// <summary>
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23 /// Determines whether the specified number is near the test number.
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24 /// </summary>
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25 /// <param name="number">The number.</param>
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26 /// <param name="testNumber">The test number.</param>
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27 /// <param name="accuracy">Accuracy.</param>
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28 /// <returns>
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29 /// <c>true</c> if the specified number is near the testing one; otherwise, <c>false</c>.
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30 /// </returns>
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31 public static bool IsNear(this double number, double testNumber, double accuracy)
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32 {
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33 return number >= (testNumber - accuracy) && number <= (testNumber + accuracy);
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34 }
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35
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36 /// <summary>
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37 /// Compares two numbers without their signs and gets absolutely minimal value.
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38 /// </summary>
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39 /// <param name="num1">First number.</param>
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40 /// <param name="num2">Second number.</param>
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41 /// <returns>Absolutely minimal value.</returns>
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42 public static double AbsMin(double num1, double num2)
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43 {
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44 if (num1.IsNotSet() && num2.IsNotSet())
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45 return double.NaN;
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46
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47 if (num1.IsNotSet()) return num2;
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48 if (num2.IsNotSet()) return num1;
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49
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50 double abs1 = Math.Abs(num1);
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51 double abs2 = Math.Abs(num2);
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52
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53 if (abs1 < abs2) return num1;
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54 if (abs2 < abs1) return num2;
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55
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56 // Abs. values are equal. Return first number
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57 return num1;
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58 }
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59
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60 /// <summary>
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61 /// Ensures the given number is in the specified range.
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62 /// </summary>
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63 /// <param name="number">The number.</param>
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64 /// <param name="low">The lower limit.</param>
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65 /// <param name="high">The upper limit.</param>
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66 /// <returns>A number in the specified range.</returns>
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67 public static double EnsureInRange(this double number, double low, double high)
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68 {
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69 if (number.IsNotSet()) return double.NaN;
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70
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71 double result = Math.Max(number, low);
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72 return Math.Min(result, high);
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73 }
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74
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75 /// <summary>
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76 /// Returns a double value if it is not a NAN, or zero.
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77 /// </summary>
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78 /// <param name="number">The number.</param>
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79 /// <returns>Double value if it is not a NAN, or zero.</returns>
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80 public static double ValueOrZero(this double number)
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81 {
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82 return double.IsNaN(number) ? 0 : number;
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83 }
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84 }
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85 }