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

Examples/Shapes/MouseTrail.cs

@@ -0,0 +1,127 @@
+/*******************************************************************************************
+*
+* raylib [shapes] example - Draw a mouse trail (position history)
+*
+* Example complexity rating: [★☆☆☆] 1/4
+*
+* Example originally created with raylib 5.6
+*
+* Example contributed by Balamurugan R (@Bala050814]) 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 Balamurugan R (@Bala050814)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Shapes;
+
+public partial class MouseTrail : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    // Define the maximum number of positions to store in the trail
+    private const int MAX_TRAIL_LENGTH = 30;
+
+    public string Name => "Shapes / Mouse Trail";
+
+    public string Title => "raylib [shapes] example - mouse trail";
+
+    // Array to store the history of mouse positions (our fixed-size queue)
+    private Vector2[] trailPositions;
+
+    public void Init()
+    {
+        // Array to store the history of mouse positions (our fixed-size queue)
+        trailPositions = new Vector2[MAX_TRAIL_LENGTH];
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        Vector2 mousePosition = GetMousePosition();
+
+        // Shift all existing positions backward by one slot in the array
+        // The last element (the oldest position) is dropped
+        for (int i = MAX_TRAIL_LENGTH - 1; i > 0; i--)
+        {
+            trailPositions[i] = trailPositions[i - 1];
+        }
+
+        // Store the new, current mouse position at the start of the array (Index 0)
+        trailPositions[0] = mousePosition;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(Color.Black);
+
+            // Draw the trail by looping through the history array
+            for (int i = 0; i < MAX_TRAIL_LENGTH; i++)
+            {
+                // Ensure we skip drawing if the array hasn't been fully filled on startup
+                if ((trailPositions[i].X != 0.0f) || (trailPositions[i].Y != 0.0f))
+                {
+                    // Calculate relative trail strength (ratio is near 1.0 for new, near 0.0 for old)
+                    float ratio = (float)(MAX_TRAIL_LENGTH - i)/MAX_TRAIL_LENGTH;
+
+                    // Fade effect: oldest positions are more transparent
+                    // Fade (color, alpha) - alpha is 0.5 to 1.0 based on ratio
+                    Color trailColor = Fade(Color.SkyBlue, ratio*0.5f + 0.5f);
+
+                    // Size effect: oldest positions are smaller
+                    float trailRadius = 15.0f*ratio;
+
+                    DrawCircleV(trailPositions[i], trailRadius, trailColor);
+                }
+            }
+
+            // Draw a distinct white circle for the current mouse position (Index 0)
+            DrawCircleV(mousePosition, 15.0f, Color.White);
+
+            DrawText("Move the mouse to see the trail effect!", 10, screenHeight - 30, 20, Color.LightGray);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - mouse trail");
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        var game = new MouseTrail();
+        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;
+    }
+}