X-Git-Url: http://dolda2000.com/gitweb/?a=blobdiff_plain;f=src%2Fcore%2Flevel%2Fmod.rs;h=47a4703e8904f65315d8fe76c6b971237ab13289;hb=d67471eea7777938ffe9fb82ac2e060133b655d9;hp=3336b95993f3dd9a40f836a0e6bc2e12ac497d31;hpb=37f3e1edd969b4ede9dd033895ff806477f6e866;p=kaka%2Frust-sdl-test.git

diff --git a/src/core/level/mod.rs b/src/core/level/mod.rs
index 3336b95..47a4703 100644
--- a/src/core/level/mod.rs
+++ b/src/core/level/mod.rs
@@ -1,6 +1,8 @@
-use common::Point;
 use core::render::Renderer;
+use geometry::{Point, Dimension, Intersection, Angle, ToAngle, supercover_line};
 use sprites::SpriteManager;
+use std::rc::Rc;
+use {point, dimen};
 
 mod lvlgen;
 
@@ -12,45 +14,303 @@ pub use self::lvlgen::LevelGenerator;
 pub struct Level {
     pub gravity: Point<f64>,
     pub grid: Grid<bool>,
-    walls: Vec<Vec<Point<isize>>>,
+    walls: Vec<Rc<WallRegion>>,
+    wall_grid: Grid<Vec<Rc<WallEdge>>>,
 }
 
 impl Level {
-    // pub fn new(gravity: Point<f64>) -> Self {
-    // 	let seed = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() as u32;
-    // 	let mut lvl = Level { gravity, grid: Grid::generate(seed, 10), iterations: 10, walls: vec!() };
-    // 	lvl.filter_regions();
-    // 	lvl
-    // }
+    pub fn new(gravity: Point<f64>, grid: Grid<bool>, mut walls: Vec<WallRegion>) -> Self {
+	let size = (2560, 1440); // TODO: get actual size from walls or something
+	let wall_grid = Level::build_wall_grid(&mut walls, &size.into());
+	dbg!(&wall_grid.scale);
+	Level {
+	    gravity,
+	    grid,
+	    walls: walls.into_iter().map(|i| Rc::new(i)).collect(),
+	    wall_grid,
+	}
+    }
 
-    pub fn render(&mut self, renderer: &mut Renderer, _sprites: &SpriteManager) {
-	renderer.canvas().set_draw_color((64, 64, 64));
-	let size = self.grid.cell_size;
-	for x in 0..self.grid.width {
-	    for y in 0..self.grid.height {
-		if self.grid.cells[x][y] {
-		    renderer.canvas().fill_rect(sdl2::rect::Rect::new(x as i32 * size as i32, y as i32 * size as i32, size as u32, size as u32)).unwrap();
+    /// Creates a grid of wall edges for fast lookup
+    fn build_wall_grid(walls: &mut Vec<WallRegion>, lvlsize: &Dimension<usize>) -> Grid<Vec<Rc<WallEdge>>> {
+	let size = dimen!(lvlsize.width / 20, lvlsize.height / 20); // TODO: make sure all walls fit within the grid bounds
+	let cs = point!(lvlsize.width / size.width, lvlsize.height / size.height);
+	//let cs = point!(scale.width as f64, scale.height as f64);
+	let mut grid = Grid {
+	    cells: vec!(vec!(vec!(); size.height); size.width),
+	    size,
+	    scale: dimen!(cs.x as f64, cs.y as f64),
+	};
+
+	for wall in walls {
+	    for edge in &wall.edges {
+		for c in grid.grid_coordinates_on_line(edge.p1, edge.p2) {
+		    grid.cells[c.x][c.y].push(Rc::clone(edge));
 		}
 	    }
 	}
 
-	let off = (size / 2) as i32;
+	grid
+    }
+
+    pub fn render(&mut self, renderer: &mut Renderer, _sprites: &SpriteManager, debug_mode: bool) {
+	if debug_mode {
+	    // original grid
+	    renderer.canvas().set_draw_color((64, 64, 64));
+	    let size = &self.grid.scale;
+	    for x in 0..self.grid.size.width {
+		for y in 0..self.grid.size.height {
+		    if self.grid.cells[x][y] {
+			renderer.canvas().fill_rect(sdl2::rect::Rect::new(
+			    x as i32 * size.width as i32,
+			    y as i32 * size.height as i32,
+			    size.width as u32,
+			    size.height as u32)).unwrap();
+		    }
+		}
+	    }
+
+	    // wall grid
+	    renderer.canvas().set_draw_color((0, 32, 0));
+	    let size = &self.wall_grid.scale;
+	    for x in 0..self.wall_grid.size.width {
+		for y in 0..self.wall_grid.size.height {
+		    if !self.wall_grid.cells[x][y].is_empty() {
+			let num = self.wall_grid.cells[x][y].len();
+			renderer.canvas().set_draw_color((0, 32*num as u8, 0));
+			renderer.canvas().fill_rect(sdl2::rect::Rect::new(
+			    x as i32 * size.width as i32,
+			    y as i32 * size.height as i32,
+			    size.width as u32,
+			    size.height as u32)).unwrap();
+		    }
+		}
+	    }
+
+	    // wall normals
+	    for wall in &self.walls {
+		for e in &wall.edges {
+		    let c = (e.p1 + e.p2) / 2.0;
+		    let a = (e.p2 - e.p1).to_angle() + std::f64::consts::FRAC_PI_2.radians();
+
+		    renderer.draw_line(
+		        <(i32, i32)>::from(c.to_i32()),
+		        <(i32, i32)>::from((c + Point::from(a) * 10.0).to_i32()),
+		        (0, 128, 255));
+		}
+	    }
+	}
+
+	// walls
 	for wall in &self.walls {
-	    for w in wall.windows(2) {
-		renderer.draw_line((w[0].x as i32 + off, w[0].y as i32 + off), (w[1].x as i32 + off, w[1].y as i32 + off), (255, 255, 0));
+	    for e in &wall.edges {
+		if !debug_mode {
+		    let c = (e.p1 + e.p2) / 2.0;
+		    let a = e.normal().reverse();
+
+		    renderer.draw_line(
+			<(i32, i32)>::from(c.to_i32()),
+			<(i32, i32)>::from((c + Point::from(a) * 10.0).to_i32()),
+			(255, 128, 0));
+
+		    renderer.draw_line(
+			<(i32, i32)>::from(e.p1.to_i32()),
+			<(i32, i32)>::from((c + Point::from(a) * 20.0).to_i32()),
+			(96, 48, 0));
+		    renderer.draw_line(
+			<(i32, i32)>::from(e.p2.to_i32()),
+			<(i32, i32)>::from((c + Point::from(a) * 20.0).to_i32()),
+		        (96, 48, 0));
+		}
+
+		renderer.draw_line(
+		    <(i32, i32)>::from(e.p1.to_i32()),
+		    <(i32, i32)>::from(e.p2.to_i32()),
+		    (255, 255, 0));
 	    }
-	    let last = wall.len() - 1;
-	    renderer.draw_line((wall[0].x as i32 + off, wall[0].y as i32 + off), (wall[last].x as i32 + off, wall[last].y as i32 + off), (255, 255, 0));
 	}
     }
+
+    pub fn intersect_walls(&self, p1: Point<f64>, p2: Point<f64>) -> IntersectResult {
+	for c in self.wall_grid.grid_coordinates_on_line(p1, p2) {
+	    for w in &self.wall_grid.cells[c.x][c.y] {
+		if let Intersection::Point(p) = Intersection::lines(p1, p2, w.p1, w.p2) {
+		    if w.point_is_in_front(p1) {
+			let wall = Wall {
+			    region: Rc::clone(&self.walls[w.region]),
+			    edge: Rc::clone(w),
+			};
+			return IntersectResult::Intersection(wall, p)
+		    }
+		}
+	    }
+	}
+	IntersectResult::None
+    }
+}
+
+pub enum IntersectResult {
+    Intersection(Wall, Point<f64>),
+    None
 }
 
 ////////// GRID ////////////////////////////////////////////////////////////////
 
-#[derive(Default)]
+#[derive(Debug, Default)]
 pub struct Grid<T> {
-    pub width: usize,
-    pub height: usize,
-    pub cell_size: usize,
+    pub size: Dimension<usize>,
+    pub scale: Dimension<f64>,
     pub cells: Vec<Vec<T>>,
 }
+
+impl<T> Grid<T> {
+    // pub fn at<C>(&self, c: C) -> Option<&T>
+    // where C: Into<(isize, isize)>
+    // {
+    // 	let c = c.into();
+    // 	if c.0 >= 0 && c.0 < self.size.width as isize && c.1 >= 0 && c.1 < self.size.height as isize {
+    // 	    Some(&self.cells[c.0 as usize][c.1 as usize])
+    // 	} else {
+    // 	    None
+    // 	}
+    // }
+
+    pub fn to_grid_coordinate<C>(&self, c: C) -> Option<Point<usize>>
+    where C: Into<(isize, isize)>
+    {
+	let c = c.into();
+	if c.0 >= 0 && c.0 < self.size.width as isize && c.1 >= 0 && c.1 < self.size.height as isize {
+	    Some(point!(c.0 as usize, c.1 as usize))
+	} else {
+	    None
+	}
+    }
+
+    /// Returns a list of grid coordinates that a line in world coordinates passes through.
+    pub fn grid_coordinates_on_line(&self, p1: Point<f64>, p2: Point<f64>) -> Vec<Point<usize>> {
+	supercover_line(p1 / self.scale, p2 / self.scale)
+	    .iter()
+	    .map(|c| self.to_grid_coordinate(*c))
+	    .flatten()
+	    .collect()
+    }
+}
+
+////////// WALL REGION /////////////////////////////////////////////////////////
+
+#[derive(Debug, Default)]
+pub struct WallRegion {
+    edges: Vec<Rc<WallEdge>>,
+}
+
+impl WallRegion {
+    pub fn new(index: RegionIndex, points: Vec<Point<f64>>) -> Self {
+	let mut edges = Vec::with_capacity(points.len());
+
+	for i in 0..points.len() {
+	    let edge = Rc::new(WallEdge {
+		region: index,
+		id: i,
+		p1: points[i],
+		p2: points[(i + 1) % points.len()],
+	    });
+	    edges.push(edge);
+	}
+
+	WallRegion { edges }
+    }
+
+    fn next(&self, index: EdgeIndex) -> Rc<WallEdge> {
+    	let index = (index + 1) % self.edges.len();
+    	self.edges[index].clone()
+    }
+
+    fn previous(&self, index: EdgeIndex) -> Rc<WallEdge> {
+    	let index = (index + self.edges.len() - 1) % self.edges.len();
+    	self.edges[index].clone()
+    }
+}
+
+////////// WALL EDGE ///////////////////////////////////////////////////////////
+
+type RegionIndex = usize;
+type EdgeIndex = usize;
+
+#[derive(Debug, Default)]
+struct WallEdge {
+    region: RegionIndex,
+    id: EdgeIndex,
+    pub p1: Point<f64>,
+    pub p2: Point<f64>,
+}
+
+impl WallEdge {
+    fn point_is_in_front(&self, p: Point<f64>) -> bool {
+	let cross = (self.p2 - self.p1).cross_product(p - self.p1);
+	cross > 0.0
+    }
+
+    fn normal(&self) -> Angle {
+	self.angle() + std::f64::consts::FRAC_PI_2.radians()
+    }
+
+    /// Angle from the right to the left point if the normal is up.
+    fn angle(&self) -> Angle {
+	(self.p2 - self.p1).to_angle()
+    }
+}
+
+////////// WALL ////////////////////////////////////////////////////////////////
+
+pub struct Wall {
+    region: Rc<WallRegion>,
+    edge: Rc<WallEdge>,
+}
+
+impl Wall {
+    #[allow(dead_code)]
+    pub fn next(&self) -> Wall {
+	Wall {
+	    edge: self.region.next(self.edge.id),
+	    region: self.region.clone(),
+	}
+    }
+
+    #[allow(dead_code)]
+    pub fn previous(&self) -> Wall {
+	Wall {
+	    edge: self.region.previous(self.edge.id),
+	    region: self.region.clone(),
+	}
+    }
+
+    pub fn normal(&self) -> Angle {
+	self.edge.normal()
+    }
+
+    pub fn angle(&self) -> Angle {
+	self.edge.angle()
+    }
+
+    pub fn from_2d(&self, pos: &Point<f64>, vel: &Point<f64>) -> (f64, f64) {
+	let pos = self.projection_of(*pos - self.edge.p1);
+	let vel = self.projection_of(*vel);
+	(pos, vel)
+    }
+
+    pub fn to_2d(&self, pos: f64, vel: f64) -> (Point<f64>, Point<f64>) {
+	let a = Point::from(self.edge.angle());
+	let pos = self.edge.p1 + a * pos;
+	let vel = a * vel;
+	(pos, vel)
+    }
+
+    /// Returns the 1D position of a point projected onto this wall.
+    /// This is done by rotating the point using a rotation matrix and then taking the resulting x value.
+    /// x'=xcos−ysin	<- only this is used
+    /// y'=xsin+ycos
+    fn projection_of(&self, p: Point<f64>) -> f64 {
+	let r = Point::from(self.edge.angle());
+	p.x * r.x + p.y * r.y // r.y is inverted here instead of inverting the angle
+    }
+}