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use std::collections::HashMap;
use std::fmt::Debug;
use std::hash::Hash;
use aabb_quadtree::{ItemId, QuadTree};
use geom::{Bounds, Circle, Distance, Polygon, Pt2D};
use widgetry::{Color, Drawable, EventCtx, GeomBatch, GfxCtx};
pub trait ObjectID: Clone + Copy + Debug + Eq + Hash {
fn zorder(&self) -> usize;
}
pub struct Object<ID: ObjectID> {
id: ID,
pub geometry: Vec<(Color, Polygon)>,
}
impl<ID: ObjectID> Object<ID> {
pub fn new(id: ID, color: Color, poly: Polygon) -> Object<ID> {
Object {
id,
geometry: vec![(color, poly)],
}
}
}
struct WorldObject {
unioned_polygon: Polygon,
draw: Drawable,
quadtree_id: ItemId,
}
pub struct World<ID: ObjectID> {
objects: HashMap<ID, WorldObject>,
quadtree: QuadTree<ID>,
current_selection: Option<ID>,
}
impl<ID: ObjectID> World<ID> {
pub fn new() -> World<ID> {
World {
objects: HashMap::new(),
quadtree: QuadTree::default(
Bounds::from(&[Pt2D::new(0.0, 0.0), Pt2D::new(std::f64::MAX, std::f64::MAX)])
.as_bbox(),
),
current_selection: None,
}
}
pub fn draw<F: Fn(ID) -> bool>(&self, g: &mut GfxCtx, show: F) {
let mut objects: Vec<ID> = Vec::new();
for &(id, _, _) in &self.quadtree.query(g.get_screen_bounds().as_bbox()) {
if show(*id) {
objects.push(*id);
}
}
objects.sort_by_key(|id| id.zorder());
for id in objects {
let obj = &self.objects[&id];
g.redraw(&obj.draw);
}
if let Some(id) = self.current_selection {
let obj = &self.objects[&id];
g.draw_polygon(Color::CYAN.alpha(0.5), obj.unioned_polygon.clone());
}
}
pub fn handle_mouseover(&mut self, ctx: &EventCtx) {
self.current_selection = None;
let cursor = if let Some(pt) = ctx.canvas.get_cursor_in_map_space() {
pt
} else {
return;
};
let mut objects: Vec<ID> = Vec::new();
for &(id, _, _) in &self.quadtree.query(
Circle::new(cursor, Distance::meters(3.0))
.get_bounds()
.as_bbox(),
) {
objects.push(*id);
}
objects.sort_by_key(|id| id.zorder());
objects.reverse();
for id in objects {
if self.objects[&id].unioned_polygon.contains_pt(cursor) {
self.current_selection = Some(id);
return;
}
}
}
pub fn force_set_selection(&mut self, id: ID) {
self.current_selection = Some(id);
}
pub fn get_selection(&self) -> Option<ID> {
self.current_selection
}
pub fn add(&mut self, ctx: &EventCtx, obj: Object<ID>) {
let unioned_polygon =
Polygon::union_all(obj.geometry.iter().map(|(_, p)| p.clone()).collect());
let bounds = unioned_polygon.get_bounds();
if bounds.min_x < 0.0 || bounds.min_y < 0.0 {
warn!("{:?} has negative coordinates {:?}", obj.id, bounds);
}
let quadtree_id = self.quadtree.insert_with_box(obj.id, bounds.as_bbox());
let draw = ctx.upload(GeomBatch::from(obj.geometry));
self.objects.insert(
obj.id,
WorldObject {
unioned_polygon,
draw,
quadtree_id,
},
);
}
pub fn delete(&mut self, id: ID) {
let obj = self.objects.remove(&id).unwrap();
if self.quadtree.remove(obj.quadtree_id).is_none() {
error!("{:?} wasn't in the quadtree", id);
}
}
}