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extern crate rand;
extern crate std;
use super::state;
use super::constants;
pub struct Gates {
x: f64,
y: f64,
v_x: f64,
v_y: f64,
a_x: f64,
a_y: f64,
target_x: f64,
target_y: f64,
health: f64,
}
pub struct GatesBullet {
real_x: f64,
real_y: f64,
d_x: f64,
d_y: f64,
}
impl GatesBullet {
pub fn new(x: i32, d_x: f64, y: i32, d_y: f64) -> GatesBullet {
GatesBullet { real_x: x as f64, real_y: y as f64, d_x: d_x, d_y: d_y }
}
}
impl state::Positioned for GatesBullet {
fn x(&self) -> i32 {
self.real_x.round() as i32
}
fn y(&self) -> i32 {
self.real_y.round() as i32
}
fn radius() -> u32 {
10
}
}
impl state::Positioned for Gates {
fn x(&self) -> i32 {
self.x.round() as i32
}
fn y(&self) -> i32 {
self.y.round() as i32
}
fn radius() -> u32 {
15
}
}
fn random_position() -> (f64, f64) {
(rand::random::<f64>() * (constants::X_DIM - 200) as f64 + 100., rand::random::<f64>() * 100.)
}
impl state::StraightBullet for GatesBullet {
fn real_x(&self) -> f64 {
self.real_x
}
fn real_y(&self) -> f64 {
self.real_y
}
fn set_real_x(&mut self, real_x: f64) {
self.real_x = real_x;
}
fn set_real_y(&mut self, real_y: f64) {
self.real_y = real_y;
}
fn d_x(&self) -> f64 {
self.d_x
}
fn d_y(&self) -> f64 {
self.d_y
}
}
fn random_bullet<T: state::Enemy<GatesBullet>>(enemy: &T) -> GatesBullet {
let multiplier = 2. + 2.*(1. - enemy.health());
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;
GatesBullet::new(enemy.x(), dx, enemy.y(), dy)
}
fn shorten(x: f64, y: f64, maxlen: f64) -> (f64, f64) {
let len = f64::sqrt(x*x + y*y);
if len > maxlen {
(x / len / 2., y / len / 2.)
} else {
(x, y)
}
}
impl state::Enemy<GatesBullet> for Gates {
fn new() -> Gates {
Gates { x: 200., y: 40., v_x: 0., v_y: 0., a_x: 0., a_y: 0., target_x: 200., target_y: 40., health: 1. }
}
fn act(&mut self, count: u64) -> Vec<GatesBullet> {
let max_accel = 0.25;
let max_velocity = 5.;
let dx = self.target_x - self.x;
let dy = self.target_y - self.y;
/* If we've arrived (close and stopped) */
if (dx*dx + dy*dy).sqrt() < max_velocity / max_accel && (self.v_x*self.v_x + self.v_y*self.v_y).sqrt() < 0.01 {
/* Then pick a new target */
let (x, y) = random_position();
self.target_x = x;
self.target_y = y;
}
let dx = self.target_x - self.x;
let dy = self.target_y - self.y;
/* If we're close */
if (dx*dx + dy*dy).sqrt() < max_velocity / max_accel {
/* Then slow down */
let (x, y) = shorten(-self.v_x, -self.v_y, max_accel);
self.a_x = x;
self.a_y = y;
} else {
/* Otherwise, speed up */
let (x, y) = shorten(dx, dy, max_accel);
self.a_x = x;
self.a_y = y;
}
/* If we're going too fast */
if (self.v_x*self.v_x + self.v_y*self.v_y).sqrt() > max_velocity {
/* Then don't go faster */
if self.v_x.signum() == self.a_x.signum() {
self.a_x = 0.;
}
if self.v_y.signum() == self.a_y.signum() {
self.a_y = 0.;
}
}
self.v_x += self.a_x;
self.x += self.v_x;
self.v_y += self.a_y;
self.y += self.v_y;
if count % 20 == 0 {
let num_bullets;
if self.health >= 0.8 {
num_bullets = 4;
} else if self.health >= 0.5 {
num_bullets = 5;
} else if self.health >= 0.3 {
num_bullets = 6;
} else if self.health >= 0.2 {
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()
}
}
fn health(&self) -> f64 {
self.health
}
fn set_health(&mut self, health: f64) {
self.health = health;
}
}
impl state::Drawable for GatesBullet {
fn center() -> (u32, u32) {
(20, 20)
}
}
impl state::Drawable for Gates {
fn center() -> (u32, u32) {
(16, 23)
}
}
|
