Implemented OscPhysBone (#13)

src/vrcosclib/Avatar/OscPhysBone.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BuildSoft.VRChat.Osc.Avatar;
+
+public class OscPhysBone
+{
+    public OscAvatarConfig Avatar { get; }
+    public string ParamName { get; }
+
+    public bool IsGrabbed => GetParameterValue<bool>(nameof(IsGrabbed));
+    public float Angle => GetParameterValue<float>(nameof(Angle));
+    public float Stretch => GetParameterValue<float>(nameof(Stretch));
+
+    public event OscAvatarParameterChangedEventHandler? ParameterChanged;
+
+    public OscPhysBone(OscAvatarConfig avatar, string paramName)
+    {
+        string[] actualParamName = {
+            paramName + "_" + nameof(IsGrabbed),
+            paramName + "_" + nameof(Angle),
+            paramName + "_" + nameof(Stretch),
+        };
+        ThrowArgumentException_IfNotExistParameters(avatar, paramName, actualParamName);
+
+        Avatar = avatar;
+        ParamName = paramName;
+
+        var allParams = OscParameter.Parameters;
+        for (int i = 0; i < actualParamName.Length; i++)
+        {
+            var address = OscConst.AvatarParameterAddressSpace + actualParamName[i];
+            allParams.AddValueChangedEventByAddress(address, GetValueCallback);
+        }
+    }
+
+    private static void ThrowArgumentException_IfNotExistParameters(OscAvatarConfig avatar, string paramName, string[] actualParamName)
+    {
+        int count = 0;
+        foreach (var name in avatar.Parameters.Names)
+        {
+            for (int i = 0; i < actualParamName.Length; i++)
+            {
+                if (actualParamName[i] == name)
+                {
+                    count++;
+                    break;
+                }
+            }
+            if (count == actualParamName.Length)
+            {
+                break;
+            }
+        }
+        if (count != actualParamName.Length)
+        {
+            throw new ArgumentException($"The avatar don't have the parameter \"{paramName}\".", nameof(avatar));
+        }
+    }
+
+    private void GetValueCallback(IReadOnlyOscParameterCollection sender, ParameterChangedEventArgs e)
+    {
+        var name = e.Address[OscConst.AvatarParameterAddressSpace.Length..];
+        OnParameterChanged(Avatar.Parameters.Get(name), e);
+    }
+
+    protected internal void OnParameterChanged(OscAvatarParameter param, ValueChangedEventArgs e)
+    {
+        ParameterChanged?.Invoke(param, e);
+    }
+
+
+    private T? GetParameterValue<T>(string name) where T : notnull
+    {
+        return Avatar.Parameters.GetAs<T>(ParamName + "_" + name);
+    }
+}