Functions/GenXdev.Helpers.Physics/Get-RefractionAngleByIncidentAngleAndIndices.cs
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// ################################################################################
// Part of PowerShell module : GenXdev.Helpers.Physics // Original cmdlet filename : Get-RefractionAngleByIncidentAngleAndIndices.cs // Original author : René Vaessen / GenXdev // Version : 3.26.2026 // ################################################################################ // Copyright (c) 2026 René Vaessen / GenXdev // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // ################################################################################ /* ############################################################################### Part of PowerShell module : GenXdev.Helpers.Physics Original cmdlet filename : Get-RefractionAngleByIncidentAngleAndIndices.cs Original author : René Vaessen / GenXdev Version : 3.26.2026 ############################################################################### Copyright (c) René Vaessen / GenXdev Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ############################################################################### */ using System.Management.Automation; namespace GenXdev.Helpers.Physics { [System.ComponentModel.Description(@" .SYNOPSIS Calculates refraction angle using Snell's law. .DESCRIPTION Uses θ2 = arcsin( (n1 / n2) sin θ1 ). .EXAMPLE ```powershell Get-RefractionAngleByIncidentAngleAndIndices -IncidentAngleInDegrees 30 -IndexOfRefraction1 1 -IndexOfRefraction2 1.33 -As ""radians"" ``` Calculates the refraction angle when light passes from air (n=1) to water (n=1.33) at 30 degrees incidence. .EXAMPLE ```powershell Get-RefractionAngleByIncidentAngleAndIndices 45 1 1.5 ``` Calculates the refraction angle when light passes from air (n=1) to glass (n=1.5) at 45 degrees incidence. ")] [Cmdlet(VerbsCommon.Get, "RefractionAngleByIncidentAngleAndIndices")] [OutputType(typeof(double))] public class GetRefractionAngleByIncidentAngleAndIndicesCommand : PSGenXdevCmdlet { /// <summary> /// Incident angle in degrees /// </summary> [Parameter( Mandatory = true, Position = 0, HelpMessage = "Incident angle in degrees")] public double IncidentAngleInDegrees { get; set; } /// <summary> /// Refractive index of first medium /// </summary> [Parameter( Mandatory = true, Position = 1, HelpMessage = "Refractive index of first medium")] public double IndexOfRefraction1 { get; set; } /// <summary> /// Refractive index of second medium /// </summary> [Parameter( Mandatory = true, Position = 2, HelpMessage = "Refractive index of second medium")] public double IndexOfRefraction2 { get; set; } /// <summary> /// Output unit for angle /// </summary> [Parameter( Mandatory = false, Position = 3, HelpMessage = "Output unit for angle")] [ValidateSet("degrees", "radians")] public string As { get; set; } = "degrees"; /// <summary> /// Begin processing - initialization logic /// </summary> protected override void BeginProcessing() { } /// <summary> /// Process record - main cmdlet logic /// </summary> protected override void ProcessRecord() { // Convert incident angle from degrees to radians double theta1Rad = IncidentAngleInDegrees * Math.PI / 180.0; // Calculate sine of refraction angle using Snell's law double sinTheta2 = (IndexOfRefraction1 / IndexOfRefraction2) * Math.Sin(theta1Rad); // Check for total internal reflection if (sinTheta2 > 1.0) { // Create error record for total internal reflection var errorRecord = new ErrorRecord( new InvalidOperationException("Total internal reflection - no refraction"), "TotalInternalReflection", ErrorCategory.InvalidOperation, null); // Throw terminating error to match original PowerShell behavior ThrowTerminatingError(errorRecord); } // Calculate refraction angle in radians double theta2Rad = Math.Asin(sinTheta2); // Convert refraction angle to degrees double angle = theta2Rad * 180.0 / Math.PI; // Use InvokeCommand to call Convert-PhysicsUnit for unit conversion var script = $"GenXdev\\Convert-PhysicsUnit -Value {angle} -FromUnit 'degrees' -ToUnit '{As}'"; // Invoke the script and get the result var results = InvokeCommand.InvokeScript(script); // Extract the double result from the collection double result = (double)results[0].BaseObject; // Write the result to the pipeline WriteObject(result); } /// <summary> /// End processing - cleanup logic /// </summary> protected override void EndProcessing() { } } } |