81 lines
2.1 KiB
Rust
81 lines
2.1 KiB
Rust
use cgmath::{Deg, InnerSpace};
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use crate::ShipBehavior;
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use galactica_content as content;
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use galactica_physics::{util, Physics, ShipHandle};
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/// "Point" ship behavior.
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/// Point and shoot towards the nearest enemy.
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pub struct Point {
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handle: ShipHandle,
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}
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impl Point {
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/// Create a new ship controller
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pub fn new(handle: ShipHandle) -> Box<Self> {
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Box::new(Self { handle })
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}
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}
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impl ShipBehavior for Point {
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fn update_controls(&mut self, physics: &mut Physics, content: &content::Content) {
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// Turn off all controls
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let s = physics.get_ship_mut(&self.handle).unwrap();
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s.controls.left = false;
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s.controls.right = false;
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s.controls.guns = false;
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s.controls.thrust = false;
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let (my_s, my_r) = physics.get_ship_body(&self.handle).unwrap();
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let my_position = util::rigidbody_position(my_r);
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let my_rotation = util::rigidbody_rotation(my_r);
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let my_angvel = my_r.angvel();
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let my_faction = content.get_faction(my_s.faction);
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// Iterate all possible targets
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let mut it = physics
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.iter_ship_body()
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.filter(|(s, _)| match my_faction.relationships[&s.faction] {
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content::Relationship::Hostile => true,
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_ => false,
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})
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.map(|(_, r)| r);
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// Find the closest target
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let mut closest_enemy_position = match it.next() {
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Some(c) => util::rigidbody_position(c),
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None => return, // Do nothing if no targets are available
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};
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let mut d = (my_position - closest_enemy_position).magnitude();
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for r in it {
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let p = util::rigidbody_position(r);
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let new_d = (my_position - p).magnitude();
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if new_d < d {
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d = new_d;
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closest_enemy_position = p;
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}
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}
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let angle_delta: Deg<f32> = (my_rotation)
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.angle(closest_enemy_position - my_position)
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.into();
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let s = physics.get_ship_mut(&self.handle).unwrap();
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s.controls.left = false;
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s.controls.right = false;
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if angle_delta < Deg(0.0) && my_angvel > -0.3 {
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s.controls.right = true;
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} else if angle_delta > Deg(0.0) && my_angvel < 0.3 {
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s.controls.left = true;
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}
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s.controls.guns = true;
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s.controls.thrust = false;
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}
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fn get_handle(&self) -> ShipHandle {
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return self.handle;
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}
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}
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