raylib-wasm/docs/examples/core/core_input_mouse_wheel.js

Make raylib games in JS for the web

const InitGame = async () => {
  InitWindow(400, 250)
}

const UpdateGame = (ts) => {
  BeginDrawing()
  ClearBackground(BLACK)
  DrawText("Sorry, this demo is not ported, yet.", 15, 110, 20, RAYWHITE)
  EndDrawing()
}

/*
#include "raylib.h"

//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [core] example - input mouse wheel");

    int boxPositionY = screenHeight/2 - 40;
    int scrollSpeed = 4;            // Scrolling speed in pixels

    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        boxPositionY -= (GetMouseWheelMove()*scrollSpeed);
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            DrawRectangle(screenWidth/2 - 40, boxPositionY, 80, 80, MAROON);

            DrawText("Use mouse wheel to move the cube up and down!", 10, 10, 20, GRAY);
            DrawText(TextFormat("Box position Y: %03i", boxPositionY), 10, 40, 20, LIGHTGRAY);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    CloseWindow();        // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}
*/