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

Examples/Shapes/VectorAngle.cs

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+/*******************************************************************************************
+*
+*   raylib [shapes] example - vector angle
+*
+*   Example complexity rating: [★★☆☆] 2/4
+*
+*   Example originally created with raylib 1.0, last time updated with raylib 5.0
+*
+*   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) 2023-2025 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+using static Raylib_cs.Raymath;        // Required for: Vector2LineAngle()
+
+namespace Examples.Shapes;
+
+public partial class VectorAngle : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    public string Name => "Shapes / Vector Angle";
+
+    public string Title => "raylib [shapes] example - vector angle";
+
+    private Vector2 v0;
+    private Vector2 v1;
+    private Vector2 v2;             // Updated with mouse position
+
+    private float angle;           // Angle in degrees
+    private int angleMode;         // 0-Vector2Angle(), 1-Vector2LineAngle()
+
+    public void Init()
+    {
+        v0 = new(screenWidth / 2.0f, screenHeight / 2.0f);
+        v1 = Vector2Add(v0, new Vector2(100.0f, 80.0f));
+        v2 = new(0, 0);            // Updated with mouse position
+
+        angle = 0.0f;             // Angle in degrees
+        angleMode = 0;            // 0-Vector2Angle(), 1-Vector2LineAngle()
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        float startangle = 0.0f;
+
+        if (angleMode == 0) startangle = -Vector2LineAngle(v0, v1) * RAD2DEG;
+        if (angleMode == 1) startangle = 0.0f;
+
+        v2 = GetMousePosition();
+
+        if (IsKeyPressed(KeyboardKey.Space)) angleMode = (angleMode == 0) ? 1 : 0;
+
+        if ((angleMode == 0) && IsMouseButtonDown(MouseButton.Right)) v1 = GetMousePosition();
+
+        if (angleMode == 0)
+        {
+            // Calculate angle between two vectors, considering a common origin (v0)
+            Vector2 v1Normal = Vector2Normalize(Vector2Subtract(v1, v0));
+            Vector2 v2Normal = Vector2Normalize(Vector2Subtract(v2, v0));
+
+            angle = Vector2Angle(v1Normal, v2Normal) * RAD2DEG;
+        }
+        else if (angleMode == 1)
+        {
+            // Calculate angle defined by a two vectors line, in reference to horizontal line
+            angle = Vector2LineAngle(v0, v2) * RAD2DEG;
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        if (angleMode == 0)
+        {
+            DrawText("MODE 0: Angle between V1 and V2", 10, 10, 20, Color.Black);
+            DrawText("Right Click to Move V2", 10, 30, 20, Color.DarkGray);
+
+            DrawLineEx(v0, v1, 2.0f, Color.Black);
+            DrawLineEx(v0, v2, 2.0f, Color.Red);
+
+            DrawCircleSector(v0, 40.0f, startangle, startangle + angle, 32, Fade(Color.Green, 0.6f));
+        }
+        else if (angleMode == 1)
+        {
+            DrawText("MODE 1: Angle formed by line V1 to V2", 10, 10, 20, Color.Black);
+
+            DrawLine(0, screenHeight / 2, screenWidth, screenHeight / 2, Color.LightGray);
+            DrawLineEx(v0, v2, 2.0f, Color.Red);
+
+            DrawCircleSector(v0, 40.0f, startangle, startangle - angle, 32, Fade(Color.Green, 0.6f));
+        }
+
+        DrawText("v0", (int)v0.X, (int)v0.Y, 10, Color.DarkGray);
+
+        // If the line from v0 to v1 would overlap the text, move it's position up 10
+        if (angleMode == 0 && Vector2Subtract(v0, v1).Y > 0.0f) DrawText("v1", (int)v1.X, (int)v1.Y - 10, 10, Color.DarkGray);
+        if (angleMode == 0 && Vector2Subtract(v0, v1).Y < 0.0f) DrawText("v1", (int)v1.X, (int)v1.Y, 10, Color.DarkGray);
+
+        // If angle mode 1, use v1 to emphasize the horizontal line
+        if (angleMode == 1) DrawText("v1", (int)v0.X + 40, (int)v0.Y, 10, Color.DarkGray);
+
+        // position adjusted by -10 so it isn't hidden by cursor
+        DrawText("v2", (int)v2.X - 10, (int)v2.Y - 10, 10, Color.DarkGray);
+
+        DrawText("Press SPACE to change MODE", 460, 10, 20, Color.DarkGray);
+        DrawText($"ANGLE: {angle:F2}", 10, 70, 20, Color.Lime);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - vector angle");
+
+        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+        //--------------------------------------------------------------------------------------
+
+        var game = new VectorAngle();
+        game.Init();
+
+        // Main game loop
+        while (!WindowShouldClose())    // Detect window close button or ESC key
+        {
+            game.Update();
+        }
+
+        game.Unload();
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        CloseWindow();        // Close window and OpenGL context
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}