Galactica/src/ship.rs

use sdl2::rect::{Point, Rect};
use sdl2::render::Canvas;
use sdl2::video::Window;

use crate::physics::PhysBody;
use crate::physics::PhysVec;
use crate::Camera;
use crate::Drawable;
use crate::ShipKind;
use crate::SpriteAtlas;

pub struct Ship {
	pub body: PhysBody,
	kind: ShipKind,
	scale: u32,
}

impl Ship {
	pub fn new(kind: ShipKind) -> Self {
		Ship {
			body: PhysBody::new(),
			kind,
			scale: 2,
		}
	}
}

impl Drawable for Ship {
	fn position(&self) -> PhysVec {
		return self.body.pos;
	}

	fn draw(
		&self,
		canvas: &mut Canvas<Window>,
		sa: &SpriteAtlas,
		c: &Camera,
	) -> Result<(), String> {
		let win_size = PhysVec::from(canvas.window().size());
		let draw_pos = self.screen_position(canvas, &c);
		// Don't draw if off screen
		if draw_pos.x < 0.0
			|| draw_pos.x > win_size.x
			|| draw_pos.y < 0.0
			|| draw_pos.y > win_size.y
		{
			return Ok(());
		}

		let sprite = sa.get(self.kind.sprite());

		let mut dest_rect_0 = Rect::new(0, 0, 120 / self.scale, 270 / self.scale);
		dest_rect_0.center_on(Point::new(
			120 / (2 * self.scale) as i32,
			270 / (2 * self.scale) as i32,
		));

		// set the current frame for time
		dest_rect_0.set_x(draw_pos.x.round() as i32);
		dest_rect_0.set_y(draw_pos.y.round() as i32);

		// copy the frame to the canvas
		canvas.copy_ex(
			&sprite.texture,
			Some(sprite.rect),
			Some(dest_rect_0),
			self.body.angle.to_degrees(), // angle
			Point::new(120 / (2 * self.scale) as i32, 270 / (2 * self.scale) as i32), // center
			false,
			false,
		)?;

		return Ok(());
	}
}