Unified position & added star prototype

src/doodad.rs

@@ -3,29 +3,21 @@ 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 {
-	sprite: String,
-	pos: PhysVec,
-	scale: u32,
-}
-
-impl Doodad {
-	pub fn new(pos: PhysVec) -> Self {
-		Doodad {
-			sprite: "a0.png".to_owned(),
-			pos,
-			scale: 1,
-		}
-	}
+	pub sprite: String,
+	pub pos: Position,
+	pub scale: u32,
+	pub angle: f64,
 }
 
 impl Drawable for Doodad {
 	fn position(&self) -> PhysVec {
-		self.pos
+		self.pos.to_cartesian().into()
 	}
 
 	fn draw(
@@ -48,10 +40,15 @@ impl Drawable for Doodad {
 
 		let sprite = sa.get(&self.sprite);
 
-		let mut dest_rect_0 = Rect::new(0, 0, 112 / self.scale, 112 / self.scale);
+		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(
-			112 / (2 * self.scale) as i32,
-			112 / (2 * self.scale) as i32,
+			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
@@ -63,8 +60,11 @@ impl Drawable for Doodad {
 			&sprite.texture,
 			Some(sprite.rect),
 			Some(dest_rect_0),
-			0.0,                                                                      // angle
-			Point::new(120 / (2 * self.scale) as i32, 270 / (2 * self.scale) as i32), // center
+			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,
 		)?;

src/main.rs

@@ -1,3 +1,4 @@
+use rand::Rng;
 use sdl2::{event::Event, keyboard::Keycode, render::Canvas, video::Window};
 use std::{time::Duration, time::Instant};
 
@@ -7,11 +8,10 @@ mod physics;
 mod ship;
 mod spriteatlas;
 
-use crate::doodad::Doodad;
-use crate::inputstatus::InputStatus;
-use crate::physics::PhysVec;
-use crate::ship::Ship;
-use crate::spriteatlas::SpriteAtlas;
+use crate::{
+	doodad::Doodad, inputstatus::InputStatus, physics::PhysVec, physics::Position, ship::Ship,
+	spriteatlas::SpriteAtlas,
+};
 
 trait Drawable {
 	/// Return the world position of this object
@@ -51,38 +51,67 @@ struct Camera {
 impl Camera {
 	fn new() -> Self {
 		Camera {
-			pos: PhysVec::zero(),
+			pos: PhysVec { x: 0.0, y: 0.0 },
 		}
 	}
 }
 
-static FTL: f64 = 1.0 / 140.0; // frame time limit
+static FTL: f64 = 1.0 / 200.0; // frame time limit
 
 struct System {
-	decor: Vec<Box<dyn Drawable>>,
+	bodies: Vec<Box<dyn Drawable>>,
 }
 
 impl System {
 	fn new() -> Self {
-		let mut s = System { decor: Vec::new() };
+		let mut s = System { bodies: Vec::new() };
 
-		s.decor.push(Box::new(Doodad::new(PhysVec::zero())));
-		s.decor
-			.push(Box::new(Doodad::new(PhysVec { x: 100.0, y: 23.0 })));
+		let mut num = rand::thread_rng();
+		for _ in 0..25 {
+			s.bodies.push(Box::new(Doodad {
+				sprite: "small.png".to_owned(),
+				pos: Position::new_cartesian(
+					num.gen_range(-500.0..500.0),
+					num.gen_range(-500.0..500.0),
+				),
+				scale: 1,
+				angle: num.gen_range(-3.0..3.0),
+			}));
+		}
+
+		s.bodies.push(Box::new(Doodad {
+			pos: Position::new_polar(PhysVec { x: 0.0, y: 0.0 }, 0.0, 0.0),
+			sprite: "a0.png".to_owned(),
+			scale: 1,
+			angle: 0.0,
+		}));
+
+		s.bodies.push(Box::new(Doodad {
+			pos: Position::new_polar(PhysVec { x: 0.0, y: 0.0 }, 300.0, 31.0),
+			sprite: "earth.png".to_owned(),
+			scale: 1,
+			angle: 180.0,
+		}));
 
 		return s;
 	}
 
+	/// Calculate the state of this body after t seconds.
+	pub fn tick(&mut self, _t: f64) {
+		//let body = &mut self.bodies[1];
+		//body.pos.angle += 0.1 * t;
+		//body.angle -= 0.1 * t;
+	}
+
 	fn draw(
 		&self,
 		canvas: &mut Canvas<Window>,
 		sa: &SpriteAtlas,
 		c: &Camera,
 	) -> Result<(), String> {
-		for d in &self.decor {
-			d.draw(canvas, sa, c)?
+		for body in &self.bodies {
+			body.draw(canvas, sa, c)?;
 		}
-
 		return Ok(());
 	}
 }
@@ -108,7 +137,7 @@ fn main() -> Result<(), String> {
 	let sa = SpriteAtlas::new(&texture_creator)?;
 	let mut event_pump = sdl_context.event_pump()?;
 
-	let system = System::new();
+	let mut system = System::new();
 
 	let mut i = InputStatus::new();
 	let mut c = Camera::new();
@@ -157,6 +186,7 @@ fn main() -> Result<(), String> {
 		//last_frame_time = frame_time;
 
 		s.body.tick(frame_time);
+		system.tick(frame_time);
 
 		if i.key_thrust {
 			s.body.thrust(50.0 * frame_time);

src/physics/body.rs

@@ -12,7 +12,7 @@ impl PhysBody {
 	pub fn new() -> Self {
 		return PhysBody {
 			pos: PhysVec { x: 200.0, y: 200.0 },
-			vel: PhysVec::zero(),
+			vel: PhysVec { x: 0.0, y: 0.0 },
 			mass: 1.0,
 			angle: 0.0,
 		};

src/physics/mod.rs

@@ -1,5 +1,9 @@
 mod body;
+mod physpol;
 mod physvec;
+mod position;
 
 pub use body::PhysBody;
+pub use physpol::PhysPol;
 pub use physvec::PhysVec;
+pub use position::Position;

src/physics/physpol.rs

@@ -0,0 +1,17 @@
+use super::PhysVec;
+
+#[derive(Debug, Clone, Copy)]
+pub struct PhysPol {
+	pub center: PhysVec,
+	pub radius: f64,
+	pub angle: f64,
+}
+
+impl PhysPol {
+	pub fn to_cartesian(&self) -> PhysVec {
+		return PhysVec {
+			x: self.radius * self.angle.sin(),
+			y: self.radius * self.angle.cos(),
+		} + self.center;
+	}
+}

src/physics/physvec.rs

@@ -6,12 +6,6 @@ pub struct PhysVec {
 	pub y: f64,
 }
 
-impl PhysVec {
-	pub fn zero() -> Self {
-		return PhysVec { x: 0f64, y: 0f64 };
-	}
-}
-
 impl From<(u32, u32)> for PhysVec {
 	fn from(value: (u32, u32)) -> Self {
 		PhysVec {

src/physics/position.rs

@@ -0,0 +1,48 @@
+use super::PhysPol;
+use super::PhysVec;
+
+#[derive(Debug, Clone, Copy)]
+pub enum Position {
+	Cartesian(PhysVec),
+	Polar(PhysPol),
+}
+
+impl Position {
+	pub fn new_cartesian(x: f64, y: f64) -> Self {
+		return Self::Cartesian(PhysVec { x, y });
+	}
+
+	pub fn new_polar(center: PhysVec, radius: f64, angle: f64) -> Self {
+		return Self::Polar(PhysPol {
+			center,
+			radius,
+			angle,
+		});
+	}
+
+	/*
+	pub fn to_polar(&self) -> Self {
+		match self {
+			Self::Cartesian(pv) => Self::Polar(pv.to_polar()),
+			Self::Polar(_) => self.clone(),
+		}
+	}
+	*/
+
+	pub fn to_cartesian(&self) -> Self {
+		match self {
+			Self::Cartesian(_) => self.clone(),
+			Self::Polar(pp) => Self::Cartesian(pp.to_cartesian()),
+		}
+	}
+}
+
+impl Into<PhysVec> for Position {
+	fn into(self) -> PhysVec {
+		let c = self.to_cartesian();
+		match c {
+			Self::Cartesian(pv) => pv,
+			_ => unreachable!(),
+		}
+	}
+}

src/spriteatlas.rs

@@ -28,6 +28,8 @@ impl<'a> SpriteAtlas<'a> {
 
 		b.load_one(texture_creator, "gypsum.png")?;
 		b.load_one(texture_creator, "a0.png")?;
+		b.load_one(texture_creator, "small.png")?;
+		b.load_one(texture_creator, "earth.png")?;
 
 		return Ok(b);
 	}