Galactica/src/doodad.rs

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

use crate::physics::PhysVec;
use crate::physics::Position;
use crate::Camera;
use crate::Drawable;
use crate::SpriteAtlas;

pub struct Doodad {
	pub sprite: String,
	pub pos: Position,
	pub scale: u32,
	pub angle: f64,
}

impl Drawable for Doodad {
	fn position(&self) -> PhysVec {
		self.pos.to_cartesian().into()
	}

	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.sprite);

		let mut dest_rect_0 = Rect::new(
			0,
			0,
			sprite.rect.width() / self.scale,
			sprite.rect.height() / self.scale,
		);
		dest_rect_0.center_on(Point::new(
			sprite.rect.width() as i32 / (2 * self.scale) as i32,
			sprite.rect.height() as i32 / (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.angle.to_degrees(), // angle
			Point::new(
				sprite.rect.width() as i32 / (2 * self.scale) as i32,
				sprite.rect.width() as i32 / (2 * self.scale) as i32,
			), // center
			false,
			false,
		)?;

		return Ok(());
	}
}