我最终想为游戏制作一个图形菜单,其中用户应该能够切换游戏窗口的分辨率。这样做的正确方法是什么?
例如,使用 sdl2 crate 的“入门”部分中的示例:
extern crate sdl2;
use sdl2::pixels::Color;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use std::time::Duration;
pub fn main() {
let sdl_context = sdl2::init().unwrap();
let video_subsystem = sdl_context.video().unwrap();
let window = video_subsystem.window("rust-sdl2 demo", 800, 600)
.position_centered()
.build()
.unwrap();
let mut canvas = window.into_canvas().build().unwrap();
canvas.set_draw_color(Color::RGB(0, 255, 255));
canvas.clear();
canvas.present();
let mut event_pump = sdl_context.event_pump().unwrap();
let mut i = 0;
'running: loop {
i = (i + 1) % 255;
canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
canvas.clear();
for event in event_pump.poll_iter() {
match event {
Event::Quit {..} |
Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
break 'running
},
_ => {}
}
}
canvas.present();
::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
}
}
理想情况下,我希望能够在循环期间的任何时候将分辨率从 800x600 更改为某个任意值(例如 1280x720),同时保持“游戏状态”完整(在本例中,这就是
i
的值)。
您可以将画布转换回窗口、&Window、&mut 窗口。
正如SDL2文档中提到的 [https://docs.rs/sdl2/latest/sdl2/render/type.WindowCanvas.html]
let mut canvas = window.into_canvas().build().unwrap();
'running: loop {
canvas.clear();
for event in event_pump.poll_iter() {
match event {
Event::Quit { .. } => {
break 'running;
},
Event::KeyDown { keycode: Some(key), .. } => {
match key {
Keycode::F11 => {
let _ = canvas.window_mut().set_size(1920, 1080);
let _ = canvas.window_mut().set_fullscreen(sdl2::video::FullscreenType::Desktop);
}
_ => {}
};
}
_ => {}
}
}
canvas.present();
::std::thread::sleep(::std::time::Duration::new(0, 1_000_000_000u32 / 60));
}