rust/hwphysics/src/collision.rs
author nemo
Tue, 24 Dec 2019 12:46:23 -0500
changeset 15524 fbcee515b946
parent 15380 6e3e5be8b2e2
child 15827 64b0a5cead86
permissions -rw-r--r--
disable fall tracing for cheese. it will probably be incorrect.
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use std::ops::RangeInclusive;
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use crate::{common::GearId, data::GearDataManager, grid::Grid};
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use fpnum::*;
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use integral_geometry::{Point, Size};
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use land2d::Land2D;
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pub fn fppoint_round(point: &FPPoint) -> Point {
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    Point::new(point.x().round(), point.y().round())
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}
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#[derive(PartialEq, Eq, Clone, Copy, Debug)]
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pub struct CircleBounds {
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    pub center: FPPoint,
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    pub radius: FPNum,
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}
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impl CircleBounds {
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    pub fn intersects(&self, other: &CircleBounds) -> bool {
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        (other.center - self.center).is_in_range(self.radius + other.radius)
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    }
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    pub fn rows(&self) -> impl Iterator<Item = (usize, RangeInclusive<usize>)> {
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        let radius = self.radius.abs_round() as usize;
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        let center = Point::from_fppoint(&self.center);
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        (center.y as usize - radius..=center.y as usize + radius)
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            .map(move |row| (row, center.x as usize - radius..=center.x as usize + radius))
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    }
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}
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#[derive(PartialEq, Eq, Clone, Copy, Debug)]
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pub struct CollisionData {
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    pub bounds: CircleBounds,
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}
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#[derive(PartialEq, Eq, Clone, Copy, Debug)]
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pub struct ContactData {
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    pub elasticity: FPNum,
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    pub friction: FPNum,
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}
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struct EnabledCollisionsCollection {
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    gear_ids: Vec<GearId>,
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    collisions: Vec<CollisionData>,
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}
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impl EnabledCollisionsCollection {
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    fn new() -> Self {
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        Self {
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            gear_ids: Vec::new(),
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            collisions: Vec::new(),
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        }
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    }
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    fn push(&mut self, gear_id: GearId, collision: CollisionData) {
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        self.gear_ids.push(gear_id);
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        self.collisions.push(collision);
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    }
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    fn iter(&self) -> impl Iterator<Item = (GearId, &CollisionData)> {
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        self.gear_ids.iter().cloned().zip(self.collisions.iter())
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    }
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}
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pub struct CollisionProcessor {
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    grid: Grid,
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    enabled_collisions: EnabledCollisionsCollection,
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    detected_collisions: DetectedCollisions,
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}
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pub struct DetectedCollisions {
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    pub pairs: Vec<(GearId, Option<GearId>)>,
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    pub positions: Vec<Point>,
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}
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impl DetectedCollisions {
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    pub fn new(capacity: usize) -> Self {
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        Self {
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            pairs: Vec::with_capacity(capacity),
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            positions: Vec::with_capacity(capacity),
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        }
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    }
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    pub fn push(
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        &mut self,
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        contact_gear_id1: GearId,
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        contact_gear_id2: Option<GearId>,
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        position: &FPPoint,
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    ) {
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        self.pairs.push((contact_gear_id1, contact_gear_id2));
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        self.positions.push(fppoint_round(&position));
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    }
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    pub fn clear(&mut self) {
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        self.pairs.clear();
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        self.positions.clear()
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    }
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}
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impl CollisionProcessor {
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    pub fn register_components(data: &mut GearDataManager) {
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        data.register::<CollisionData>();
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        data.register::<ContactData>();
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    }
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    pub fn new(size: Size) -> Self {
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        Self {
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            grid: Grid::new(size),
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            enabled_collisions: EnabledCollisionsCollection::new(),
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            detected_collisions: DetectedCollisions::new(0),
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        }
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    }
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    pub fn add(&mut self, gear_id: GearId, gear_data: CollisionData) {
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        self.grid.insert_static(gear_id, &gear_data.bounds);
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    }
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    pub fn remove(&mut self, gear_id: GearId) {
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        self.grid.remove(gear_id);
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    }
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    pub fn get(&mut self, gear_id: GearId) -> Option<CollisionData> {
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        None
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    }
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    pub fn process(
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        &mut self,
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        land: &Land2D<u32>,
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        updates: &crate::physics::PositionUpdates,
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    ) -> &DetectedCollisions {
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        self.detected_collisions.clear();
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        for (id, old_position, new_position) in updates.iter() {
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            self.grid.update_position(id, old_position, new_position)
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        }
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        self.grid.check_collisions(&mut self.detected_collisions);
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        for (gear_id, collision) in self.enabled_collisions.iter() {
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            if collision
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                .bounds
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                .rows()
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                .any(|(y, r)| (&land[y][r]).iter().any(|v| *v != 0))
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            {
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                self.detected_collisions
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                    .push(gear_id, None, &collision.bounds.center)
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            }
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        }
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        &self.detected_collisions
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    }
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}