Window and drawing

The window is opened by calling raylib::init().build(). The builder returns a (RaylibHandle, RaylibThread) pair that controls the entire lifecycle: the handle exposes every per-frame operation, and the thread token is the proof that you are on the correct OS thread. Drawing happens between begin_drawing and the end of the returned guard's lifetime — all draw primitives live on the RaylibDraw trait implemented by RaylibDrawHandle.

API surface

• RaylibBuilder — fluent builder returned by raylib::init(); call .build() to open the window. Key builder methods: .size(w, h), .title(s), .vsync(), .msaa_4x(), .undecorated().
• RaylibHandle — the main handle; owns the window and is the receiver for most API calls.
• RaylibHandle::set_target_fps — cap the frame rate. set_target_fps(0) disables the limiter (busy-spin).
• RaylibHandle::begin_drawing — returns a scoped RaylibDrawHandle; EndDrawing fires automatically on drop.
• RaylibDraw — trait with all 2D drawing primitives: clear_background, draw_text, draw_rectangle, draw_line, draw_circle, draw_texture, and more.
• RaylibHandle::window_should_close — returns true when the OS close event has been sent.

Example

# extern crate raylib;
use raylib::prelude::*;

fn main() {
    let (mut rl, thread) = raylib::init()
        .size(640, 480)
        .title("Hello, raylib-rs!")
        .vsync()
        .build();

    rl.set_target_fps(60);

    while !rl.window_should_close() {
        let mut d = rl.begin_drawing(&thread);
        d.clear_background(Color::RAYWHITE);
        d.draw_text("Hello, world!", 12, 12, 20, Color::DARKGRAY);
    }
    // RaylibHandle is dropped here; CloseWindow() is called automatically.
}

Gotchas

• Draw only inside the guard. All methods on RaylibDraw are only accessible on the RaylibDrawHandle scope. You cannot call draw_text directly on RaylibHandle — you must enter begin_drawing first.
• FPS pacing. set_target_fps(0) removes the frame limiter entirely; raylib will busy-spin. Omitting the call defaults to the raylib default (60 on most platforms).
• Window state queries. is_window_minimized, is_window_resized, and related helpers live on the RaylibWindow trait — check the trait's documentation for the current set of methods.
• RaylibThread is !Send. Never put it in a Mutex, Arc, or hand it to another thread. See the Handle and thread chapter for why.

See also

• Handle and thread — lifecycle details and the !Send invariant.
• Input — reading keyboard, mouse, and gamepad inside the loop.
• Shapes — the full 2D primitive catalogue.

Showcase examples

Showcase examples that exercise this module:

• core_basic_window
• core_window_flags
• core_window_letterbox
• core_window_should_close
• core_2d_camera
• core_basic_screen_manager