Write a working bullet hell

I just fucked up the enemy movement, but hopefully I won't ever need
that old code. The new one is going to look really cool and sweet.
Anything with just modifying acceleration must look very cool and
smooth.

1 files changed, 237 insertions, 0 deletions

diff --git a/src/state.rs b/src/state.rs
new file mode 100644
index 0000000..74ac73b
--- /dev/null
+++ b/src/state.rs
@@ -0,0 +1,237 @@
+extern crate sdl2;
+extern crate std;
+extern crate rand;
+
+use super::player;
+use super::constants;
+
+pub struct EBullet {
+    x: i32,
+    y: i32,
+    radius: u32,
+    real_x: f64,
+    real_y: f64,
+    d_x: f64,
+    d_y: f64,
+}
+
+pub struct Enemy {
+    pub x: i32,
+    pub y: i32,
+    action_count: u64,
+    v_x: f64,
+    v_y: f64,
+    a_x: f64,
+    a_y: f64,
+    target_x: f64,
+    target_y: f64,
+    radius: u32,
+    pub health: i64,
+}
+
+const STARTING_HEALTH: i64 = 100;
+
+impl EBullet {
+    pub fn new(x: i32, d_x: f64, y: i32, d_y: f64) -> EBullet {
+        EBullet { x: x, real_x: x as f64, y: y, real_y: y as f64, radius: 10, d_x: d_x, d_y: d_y }
+    }
+
+    pub fn act(&mut self) {
+        self.real_x += self.d_x;
+        self.real_y += self.d_y;
+        self.x = self.real_x.round() as i32;
+        self.y = self.real_y.round() as i32;
+    }
+}
+
+pub struct PBullet {
+    b: EBullet,
+}
+
+impl PBullet {
+    pub fn new(x: i32, d_x: f64, y: i32, d_y: f64) -> PBullet {
+        PBullet { b: EBullet::new(x, d_x, y, d_y) }
+    }
+    pub fn act(&mut self) {
+        self.b.act()
+    }
+    pub fn delete(&mut self) {
+        self.b.x = -10;
+    }
+}
+
+fn random_bullet(enemy: &Enemy) -> EBullet {
+    let multiplier = 2. + (STARTING_HEALTH as i64 - enemy.health) as f64 / STARTING_HEALTH as f64 * 2.;
+    let theta: f64 = rand::random::<f64>()*2.*std::f64::consts::PI/3. + std::f64::consts::PI/6.;
+    let dx = f64::cos(theta) * multiplier;
+    let dy = f64::sin(theta) * multiplier;
+    EBullet::new(enemy.x, dx, enemy.y, dy)
+}
+
+fn random_position() -> (f64, f64) {
+    (rand::random() * (constants::X_DIM - 200) as f64 + 100., rand::random() * 200)
+}
+
+impl Enemy {
+    pub fn new() -> Enemy {
+        Enemy { x: 200, y: 40, action_count: 1, v_x: 0., v_y: 0., a_x: 0., a_y: 0., radius: 30, health: STARTING_HEALTH, target_x: 200, target_y: 400 }
+    }
+    pub fn act(&mut self, count: u64) -> Vec<EBullet> {
+        let dx = self.target_x - self.x;
+        let dy = self.target_y - self.y;
+        /* Made it; pick a new destination */
+        if f64::sqrt(dx*dx + dy*dy) < 10 {
+            let (self.target_x, self.target_y) = random_position();
+        }
+        let vec_x = self.target_x - self.real_x;
+        let vec_y = self.target_y - self.real_y;
+        let len = f64::sqrt(vec_x*vec_x + vec_y*vec_y);
+        self.a_x = vec_x / len / 2.;
+        self.a_y = vec_y / len / 2.;
+
+        self.v_x += self.a_x;
+        self.x = (self.x as f64 + self.v_x).round() as i32;
+        self.v_y += self.a_y;
+        self.y = (self.y as f64 + self.v_y).round() as i32;
+        if count % 20 == 0 {
+            let num_bullets;
+            if self.health >= 80 {
+                num_bullets = 4;
+            } else if self.health >= 50 {
+                num_bullets = 5;
+            } else if self.health >= 30 {
+                num_bullets = 6;
+            } else if self.health >= 20 {
+                num_bullets = 7;
+            } else {
+                num_bullets = 8;
+            }
+            let mut result = Vec::new();
+            for _ in 0..num_bullets {
+                result.push(random_bullet(&*self));
+            }
+            result
+        } else {
+            Vec::new()
+        }
+    }
+    pub fn health(&self) -> i64 {
+        self.health
+    }
+}
+
+pub struct State {
+    pub player: player::Player,
+    pub enemies: Vec<Enemy>,
+    pub bullets: Vec<EBullet>,
+    pub player_bullets: Vec<PBullet>,
+    pub count: u64,
+}
+
+impl State {
+    pub fn new() -> State {
+        State { player: player::Player::new(), enemies: Vec::new(), bullets: Vec::new(), count: 0, player_bullets: Vec::new() }
+    }
+}
+
+fn dist(x1: i32, y1: i32, x2: i32, y2: i32) -> f64 {
+    let xdist = x1 - x2;
+    let ydist = y1 - y2;
+    f64::sqrt((xdist*xdist + ydist*ydist) as f64)
+}
+
+pub trait Positioned {
+    fn x(&self) -> i32;
+    fn y(&self) -> i32;
+    fn radius(&self) -> u32;
+    fn contains(&self, x: i32, y: i32) -> bool {
+        let d = dist(self.x(), self.y(), x, y);
+        d <= self.radius() as f64
+    }
+    fn overlaps<T: Positioned>(&self, other: &T) -> bool {
+        let dist = dist(self.x(), self.y(), other.x(), other.y());
+        dist < (self.radius() + other.radius()) as f64
+    }
+    fn outside(&self) -> bool {
+        let x = self.x();
+        let y = self.y();
+        x < 0 || x as u32 > constants::X_DIM || y < 0 || y as u32 > constants::Y_DIM
+    }
+}
+
+impl Positioned for EBullet {
+    fn x(&self) -> i32 {
+        self.x
+    }
+    fn y(&self) -> i32 {
+        self.y
+    }
+    fn radius(&self) -> u32 {
+        self.radius
+    }
+}
+
+impl Positioned for PBullet {
+    fn x(&self) -> i32 {
+        self.b.x()
+    }
+    fn y(&self) -> i32 {
+        self.b.y()
+    }
+    fn radius(&self) -> u32 {
+        self.b.radius()
+    }
+}
+
+impl Positioned for Enemy {
+    fn x(&self) -> i32 {
+        self.x
+    }
+    fn y(&self) -> i32 {
+        self.y
+    }
+    fn radius(&self) -> u32 {
+        self.radius
+    }
+}
+
+pub trait Drawable : Positioned {
+    fn color(&self) -> sdl2::pixels::Color;
+    fn draw(&self, canvas: &mut sdl2::render::WindowCanvas) {
+        let x = self.x();
+        let y = self.y();
+        let r = self.radius();
+        let r = r as i32;
+        let x_min = x - r;
+        let x_max = x + r;
+        let y_min = y - r;
+        let y_max = y + r;
+        canvas.set_draw_color(self.color());
+        for x in x_min..x_max + 1 {
+            for y in y_min..y_max + 1 {
+                if self.contains(x, y) {
+                    canvas.fill_rect(sdl2::rect::Rect::new(x, y, 1, 1)).unwrap();
+                }
+            }
+        }
+    }
+}
+
+impl Drawable for Enemy {
+    fn color(&self) -> sdl2::pixels::Color {
+        let red_scale = self.health as f64 / STARTING_HEALTH as f64 * 255.;
+        sdl2::pixels::Color::RGB(red_scale as u8, 255 - red_scale as u8, 0)
+    }
+}
+
+impl Drawable for EBullet {
+    fn color(&self) -> sdl2::pixels::Color {
+        sdl2::pixels::Color::RGB(0, 0, 255)
+    }
+}
+
+impl Drawable for PBullet {
+    fn color(&self) -> sdl2::pixels::Color {
+        sdl2::pixels::Color::RGB(230, 255, 230)
+    }
+}