Initial commit from MyParking project
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using System;
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namespace MyParking.Shared
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{
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/// <summary>
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/// 提供与坐标系无关的角度归一化、角度差和单位转换功能。
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/// </summary>
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public static class AngleMath
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{
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public const double TwoPi = 2.0 * Math.PI;
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/// <summary>
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/// 将弧度归一化到[-π, π)区间。
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/// -π包含在结果中,+π不包含在结果中,因此+π会返回-π。
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/// </summary>
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public static double NormalizeRadians(double angleRadians)
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{
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EnsureFinite(angleRadians, nameof(angleRadians));
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var normalized = angleRadians % TwoPi;
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if (normalized >= Math.PI)
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{
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normalized -= TwoPi;
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}
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else if (normalized < -Math.PI)
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{
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normalized += TwoPi;
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}
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return normalized == 0.0 ? 0.0 : normalized;
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}
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/// <summary>
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/// 将角度归一化到[-180°, 180°)区间。
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/// -180°包含在结果中,+180°不包含在结果中,因此+180°会返回-180°。
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/// </summary>
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public static double NormalizeDegrees(double angleDegrees)
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{
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EnsureFinite(angleDegrees, nameof(angleDegrees));
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var normalized = angleDegrees % 360.0;
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if (normalized >= 180.0)
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{
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normalized -= 360.0;
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}
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else if (normalized < -180.0)
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{
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normalized += 360.0;
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}
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return normalized == 0.0 ? 0.0 : normalized;
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}
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/// <summary>
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/// 计算从当前方向旋转到目标方向的最短有符号角度差,单位为弧度。
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/// 返回值位于[-π, π);正值表示逆时针,负值表示顺时针。
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/// </summary>
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public static double ShortestDifferenceRadians(
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double targetRadians,
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double currentRadians)
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{
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EnsureFinite(targetRadians, nameof(targetRadians));
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EnsureFinite(currentRadians, nameof(currentRadians));
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return NormalizeRadians(targetRadians - currentRadians);
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}
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/// <summary>
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/// 计算从当前方向旋转到目标方向的最短有符号角度差,单位为度。
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/// 返回值位于[-180°, 180°);正值表示逆时针,负值表示顺时针。
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/// </summary>
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public static double ShortestDifferenceDegrees(
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double targetDegrees,
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double currentDegrees)
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{
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EnsureFinite(targetDegrees, nameof(targetDegrees));
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EnsureFinite(currentDegrees, nameof(currentDegrees));
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return NormalizeDegrees(targetDegrees - currentDegrees);
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}
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/// <summary>
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/// 将角度从度转换为弧度,不进行归一化。
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/// </summary>
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public static double DegreesToRadians(double angleDegrees)
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{
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EnsureFinite(angleDegrees, nameof(angleDegrees));
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return angleDegrees * Math.PI / 180.0;
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}
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/// <summary>
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/// 将角度从弧度转换为度,不进行归一化。
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/// </summary>
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public static double RadiansToDegrees(double angleRadians)
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{
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EnsureFinite(angleRadians, nameof(angleRadians));
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return angleRadians * 180.0 / Math.PI;
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}
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/// <summary>
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/// 验证角度是可用于计算的有限数值。
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/// </summary>
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private static void EnsureFinite(double angle, string parameterName)
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{
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if (double.IsNaN(angle) || double.IsInfinity(angle))
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{
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throw new ArgumentOutOfRangeException(
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parameterName,
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"角度必须是有限数值。");
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}
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}
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}
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}
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