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use tetra::graphics::{self, Camera, Color, DrawParams, Texture};
use tetra::input::{self, Key};
use tetra::math::Vec2;
use tetra::{Context, ContextBuilder, Event, State};
const MOVEMENT_SPEED: f32 = 4.0;
const ROTATION_SPEED: f32 = 0.1;
const ZOOM_SPEED: f32 = 0.1;
struct GameState {
texture: Texture,
camera: Camera,
}
impl GameState {
fn new(ctx: &mut Context) -> tetra::Result<GameState> {
Ok(GameState {
texture: Texture::new(ctx, "./examples/resources/player.png")?,
camera: Camera::with_window_size(ctx),
})
}
}
impl State for GameState {
fn update(&mut self, ctx: &mut Context) -> tetra::Result {
if input::is_key_down(ctx, Key::W) {
self.camera.position.y -= MOVEMENT_SPEED;
}
if input::is_key_down(ctx, Key::S) {
self.camera.position.y += MOVEMENT_SPEED;
}
if input::is_key_down(ctx, Key::A) {
self.camera.position.x -= MOVEMENT_SPEED;
}
if input::is_key_down(ctx, Key::D) {
self.camera.position.x += MOVEMENT_SPEED;
}
if input::is_key_down(ctx, Key::Q) {
self.camera.rotation -= ROTATION_SPEED;
}
if input::is_key_down(ctx, Key::E) {
self.camera.rotation += ROTATION_SPEED;
}
if input::is_key_down(ctx, Key::R) {
self.camera.zoom += ZOOM_SPEED;
}
if input::is_key_down(ctx, Key::F) {
self.camera.zoom -= ZOOM_SPEED;
}
self.camera.update();
Ok(())
}
fn draw(&mut self, ctx: &mut Context) -> tetra::Result {
graphics::clear(ctx, Color::rgb(0.769, 0.812, 0.631));
graphics::set_transform_matrix(ctx, self.camera.as_matrix());
graphics::draw(
ctx,
&self.texture,
DrawParams::new()
.origin(Vec2::new(8.0, 8.0))
.scale(Vec2::new(2.0, 2.0)),
);
Ok(())
}
fn event(&mut self, _: &mut Context, event: Event) -> tetra::Result {
if let Event::Resized { width, height } = event {
self.camera.set_viewport_size(width as f32, height as f32);
self.camera.update();
}
Ok(())
}
}
fn main() -> tetra::Result {
ContextBuilder::new("Cameras", 640, 480)
.resizable(true)
.quit_on_escape(true)
.build()?
.run(GameState::new)
}
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