https://www.raylib.com/examples/web/core/loader.html?name=core_input_mouse_wheel

The original C example, edited for easier comparison:

#include "raylib.h"

int main(void)
{
    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

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

        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(FormatText("Box position Y: %03i", boxPositionY), 10, 40, 20, LIGHTGRAY);

        EndDrawing();
    }

    CloseWindow();        // Close window and OpenGL context

    return 0;
}

The Rust version:

use raylib::prelude::*;

fn main() {
    let screen_width = 800;
    let screen_height = 450;

    let (mut rl, thread) = raylib::init()
        .size(screen_width, screen_height)
        .title("raylib [core] example - input mouse wheel")
        .build();

    let mut box_position_y = screen_height / 2 - 40;
    let scroll_speed = 4;

    rl.set_target_fps(60); // Set our game to run at 60 frames-per-second

    while !rl.window_should_close() {
        box_position_y -= rl.get_mouse_wheel_move() * scroll_speed;

        let mut d = rl.begin_drawing(&thread);

        d.clear_background(Color::RAYWHITE);

        d.draw_rectangle(screen_width / 2 - 40, box_position_y, 80, 80, Color::MAROON);

        d.draw_text(
            "Use mouse wheel to move the cube up and down!",
            10,
            10,
            20,
            Color::DARKGRAY,
        );

        d.draw_text(
            &format!("Box position Y: {}", box_position_y), // this is the rust equivalent to FormatText()
            10,
            40,
            20,
            Color::LIGHTGRAY,
        );
    }
}

Tags: examples in raylib-rs, mouse wheel input