feat: backporting existing raylib-cs examples and new official raylib examples to WASM, adopting raylib's original code style

Examples/Shapes/MathAngleRotation.cs

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+/*******************************************************************************************
+*
+*   raylib [shapes] example - math angle rotation
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 6.0, last time updated with raylib 5.6
+*
+*   Example contributed by Kris (@krispy-snacc) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2025 Kris (@krispy-snacc)
+*
+********************************************************************************************/
+
+using System;
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Shapes;
+
+public partial class MathAngleRotation : IExample
+{
+    private const int screenWidth = 720;
+    private const int screenHeight = 400;
+
+    public string Name => "Shapes / Math Angle Rotation";
+
+    public string Title => "raylib [shapes] example - math angle rotation";
+
+    public int Width => screenWidth;
+
+    public int Height => screenHeight;
+
+    private Vector2 center;
+    private const float lineLength = 150.0f;
+
+    // Predefined angles for fixed lines
+    private int[] angles;
+    private int numAngles;
+
+    private float totalAngle; // Animated rotation angle
+
+    public void Init()
+    {
+        center = new Vector2(screenWidth/2.0f, screenHeight/2.0f);
+
+        // Predefined angles for fixed lines
+        angles = new[] { 0, 30, 60, 90 };
+        numAngles = angles.Length;
+
+        totalAngle = 0.0f; // Animated rotation angle
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        totalAngle += 1.0f; // degrees per frame
+        if (totalAngle >= 360.0f) totalAngle -= 360.0f;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            ClearBackground(Color.White);
+
+            DrawText("Fixed angles + rotating line", 10, 10, 20, Color.LightGray);
+
+            // Draw fixed-angle lines with colorful gradient
+            for (int i = 0; i < numAngles; i++)
+            {
+                float rad = angles[i]*DEG2RAD;
+                Vector2 end = new Vector2(center.X + MathF.Cos(rad)*lineLength,
+                                          center.Y + MathF.Sin(rad)*lineLength);
+
+                // Gradient color from green → cyan → blue → magenta
+                Color col;
+                switch(i)
+                {
+                    case 0: col = Color.Green; break;
+                    case 1: col = Color.Orange; break;
+                    case 2: col = Color.Blue; break;
+                    case 3: col = Color.Magenta; break;
+                    default: col = Color.White; break;
+                }
+
+                DrawLineEx(center, end, 5.0f, col);
+
+                // Draw angle label slightly offset along the line
+                Vector2 textPos = new Vector2(center.X + MathF.Cos(rad)*(lineLength + 20),
+                                              center.Y + MathF.Sin(rad)*(lineLength + 20));
+                DrawText($"{angles[i]}°", (int)textPos.X, (int)textPos.Y, 20, col);
+            }
+
+            // Draw animated rotating line with changing color
+            float animRad = totalAngle*DEG2RAD;
+            Vector2 animEnd = new Vector2(center.X + MathF.Cos(animRad)*lineLength,
+                                          center.Y + MathF.Sin(animRad)*lineLength);
+
+            // Cycle through HSV colors for animated line
+            Color animCol = ColorFromHSV(totalAngle % 360.0f, 0.8f, 0.9f);
+            DrawLineEx(center, animEnd, 5.0f, animCol);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - math angle rotation");
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        var game = new MathAngleRotation();
+        game.Init();
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            game.Update();
+        }
+
+        game.Unload();
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}