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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 crate::mapspace::{ToggleZoomed, ToggleZoomedBuilder};
use crate::{Color, EventCtx, GeomBatch, GfxCtx, MultiKey, RewriteColor, Text};
pub struct World<ID: ObjectID> {
objects: HashMap<ID, Object<ID>>,
quadtree: QuadTree<ID>,
draw_master_batches: Vec<ToggleZoomed>,
hovering: Option<ID>,
dragging_from: Option<(Pt2D, bool)>,
}
#[derive(Clone)]
pub enum WorldOutcome<ID: ObjectID> {
ClickedFreeSpace(Pt2D),
Dragging {
obj: ID,
dx: f64,
dy: f64,
cursor: Pt2D,
},
Keypress(&'static str, ID),
ClickedObject(ID),
HoverChanged(Option<ID>, Option<ID>),
Nothing,
}
impl<I: ObjectID> WorldOutcome<I> {
pub fn maybe_map_id<O: ObjectID, F: Fn(I) -> Option<O>>(self, f: F) -> Option<WorldOutcome<O>> {
match self {
WorldOutcome::ClickedFreeSpace(pt) => Some(WorldOutcome::ClickedFreeSpace(pt)),
WorldOutcome::Dragging {
obj,
dx,
dy,
cursor,
} => Some(WorldOutcome::Dragging {
obj: f(obj)?,
dx,
dy,
cursor,
}),
WorldOutcome::Keypress(action, id) => Some(WorldOutcome::Keypress(action, f(id)?)),
WorldOutcome::ClickedObject(id) => Some(WorldOutcome::ClickedObject(f(id)?)),
WorldOutcome::HoverChanged(before, after) => {
let before = match before {
Some(x) => Some(f(x)?),
None => None,
};
let after = match after {
Some(x) => Some(f(x)?),
None => None,
};
Some(WorldOutcome::HoverChanged(before, after))
}
WorldOutcome::Nothing => Some(WorldOutcome::Nothing),
}
}
}
pub trait ObjectID: Clone + Copy + Debug + Eq + Hash {}
pub struct ObjectBuilder<'a, ID: ObjectID> {
world: &'a mut World<ID>,
id: ID,
hitbox: Option<Polygon>,
zorder: usize,
draw_normal: Option<ToggleZoomedBuilder>,
draw_hover: Option<ToggleZoomedBuilder>,
tooltip: Option<Text>,
clickable: bool,
draggable: bool,
keybindings: Vec<(MultiKey, &'static str)>,
}
impl<'a, ID: ObjectID> ObjectBuilder<'a, ID> {
pub fn hitbox(mut self, polygon: Polygon) -> Self {
assert!(self.hitbox.is_none(), "called hitbox twice");
self.hitbox = Some(polygon);
self
}
pub fn zorder(mut self, zorder: usize) -> Self {
assert!(self.zorder == 0, "called zorder twice");
self.zorder = zorder;
self
}
pub fn draw<I: Into<ToggleZoomedBuilder>>(mut self, normal: I) -> Self {
assert!(
self.draw_normal.is_none(),
"already specified how to draw normally"
);
self.draw_normal = Some(normal.into());
self
}
pub fn draw_color(self, color: Color) -> Self {
let hitbox = self.hitbox.clone().expect("call hitbox first");
self.draw(GeomBatch::from(vec![(color, hitbox)]))
}
pub fn draw_color_unzoomed(self, color: Color) -> Self {
let hitbox = self.hitbox.clone().expect("call hitbox first");
let mut draw = ToggleZoomed::builder();
draw.unzoomed.push(color, hitbox);
self.draw(draw)
}
pub fn drawn_in_master_batch(self) -> Self {
assert!(
self.draw_normal.is_none(),
"object is already drawn normally"
);
self.draw(GeomBatch::new())
}
pub fn draw_hovered<I: Into<ToggleZoomedBuilder>>(mut self, hovered: I) -> Self {
assert!(
self.draw_hover.is_none(),
"already specified how to draw hovered"
);
self.draw_hover = Some(hovered.into());
self
}
pub fn draw_hover_rewrite(self, rewrite: RewriteColor) -> Self {
let hovered = self
.draw_normal
.clone()
.expect("first specify how to draw normally")
.color(rewrite);
self.draw_hovered(hovered)
}
pub fn hover_alpha(self, alpha: f32) -> Self {
self.draw_hover_rewrite(RewriteColor::ChangeAlpha(alpha))
}
pub fn hover_outline(self, color: Color, thickness: Distance) -> Self {
let mut draw = self
.draw_normal
.clone()
.expect("first specify how to draw normally")
.draw_differently_zoomed();
let hitbox = self.hitbox.as_ref().expect("call hitbox first");
if let (Ok(unzoomed), Ok(zoomed)) = (
hitbox.to_outline(thickness),
hitbox.to_outline(thickness / 2.0),
) {
draw.unzoomed.push(color, unzoomed);
draw.zoomed.push(color.multiply_alpha(0.5), zoomed);
} else {
warn!(
"Can't hover_outline for {:?}. Falling back to a colored polygon",
self.id
);
draw = GeomBatch::from(vec![(
color.multiply_alpha(0.5),
self.hitbox.clone().unwrap(),
)])
.into();
}
self.draw_hovered(draw)
}
pub fn invisibly_hoverable(self) -> Self {
self.draw_hovered(GeomBatch::new())
}
pub fn tooltip(mut self, txt: Text) -> Self {
assert!(self.tooltip.is_none(), "already specified tooltip");
assert!(
self.draw_hover.is_some(),
"first specify how to draw hovered"
);
self.tooltip = Some(txt);
self
}
pub fn clickable(mut self) -> Self {
assert!(!self.clickable, "called clickable twice");
self.clickable = true;
self
}
pub fn set_clickable(mut self, clickable: bool) -> Self {
self.clickable = clickable;
self
}
pub fn draggable(mut self) -> Self {
assert!(!self.draggable, "called draggable twice");
self.draggable = true;
self
}
pub fn hotkey<I: Into<MultiKey>>(mut self, key: I, action: &'static str) -> Self {
self.keybindings.push((key.into(), action));
self
}
pub fn build(mut self, ctx: &EventCtx) {
let hitbox = self.hitbox.take().expect("didn't specify hitbox");
let bounds = hitbox.get_bounds();
let quadtree_id = self
.world
.quadtree
.insert_with_box(self.id, bounds.as_bbox());
self.world.objects.insert(
self.id,
Object {
_id: self.id,
quadtree_id,
hitbox,
zorder: self.zorder,
draw_normal: self
.draw_normal
.expect("didn't specify how to draw normally")
.build(ctx),
draw_hover: self.draw_hover.take().map(|draw| draw.build(ctx)),
tooltip: self.tooltip,
clickable: self.clickable,
draggable: self.draggable,
keybindings: self.keybindings,
},
);
}
}
struct Object<ID: ObjectID> {
_id: ID,
quadtree_id: ItemId,
hitbox: Polygon,
zorder: usize,
draw_normal: ToggleZoomed,
draw_hover: Option<ToggleZoomed>,
tooltip: Option<Text>,
clickable: bool,
draggable: bool,
keybindings: Vec<(MultiKey, &'static str)>,
}
impl<ID: ObjectID> World<ID> {
pub fn unbounded() -> 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(),
),
draw_master_batches: Vec::new(),
hovering: None,
dragging_from: None,
}
}
pub fn bounded(bounds: &Bounds) -> World<ID> {
World {
objects: HashMap::new(),
quadtree: QuadTree::default(bounds.as_bbox()),
draw_master_batches: Vec::new(),
hovering: None,
dragging_from: None,
}
}
pub fn add(&mut self, id: ID) -> ObjectBuilder<'_, ID> {
assert!(!self.objects.contains_key(&id), "duplicate object added");
ObjectBuilder {
world: self,
id,
hitbox: None,
zorder: 0,
draw_normal: None,
draw_hover: None,
tooltip: None,
clickable: false,
draggable: false,
keybindings: Vec::new(),
}
}
pub fn delete(&mut self, id: ID) {
if self.hovering == Some(id) {
self.hovering = None;
if self.dragging_from.is_some() {
panic!("Can't delete {:?} mid-drag", id);
}
}
self.delete_before_replacement(id);
}
pub fn delete_before_replacement(&mut self, id: ID) {
if let Some(obj) = self.objects.remove(&id) {
if self.quadtree.remove(obj.quadtree_id).is_none() {
warn!("{:?} wasn't in the quadtree", id);
}
} else {
panic!("Can't delete {:?}; it's not in the World", id);
}
}
pub fn maybe_delete(&mut self, id: ID) {
if self.hovering == Some(id) {
self.hovering = None;
if self.dragging_from.is_some() {
panic!("Can't delete {:?} mid-drag", id);
}
}
if let Some(obj) = self.objects.remove(&id) {
if self.quadtree.remove(obj.quadtree_id).is_none() {
warn!("{:?} wasn't in the quadtree", id);
}
}
}
pub fn initialize_hover(&mut self, ctx: &EventCtx) {
self.hovering = ctx
.canvas
.get_cursor_in_map_space()
.and_then(|cursor| self.calculate_hover(cursor));
}
pub fn rebuilt_during_drag(&mut self, prev_world: &World<ID>) {
if prev_world.dragging_from.is_some() {
self.dragging_from = prev_world.dragging_from;
self.hovering = prev_world.hovering;
assert!(self.objects.contains_key(self.hovering.as_ref().unwrap()));
}
}
pub fn draw_master_batch<I: Into<ToggleZoomedBuilder>>(&mut self, ctx: &EventCtx, draw: I) {
self.draw_master_batches.push(draw.into().build(ctx));
}
pub fn draw_master_batch_built(&mut self, draw: ToggleZoomed) {
self.draw_master_batches.push(draw);
}
pub fn event(&mut self, ctx: &mut EventCtx) -> WorldOutcome<ID> {
if let Some((drag_from, moved)) = self.dragging_from {
if ctx.input.left_mouse_button_released() {
self.dragging_from = None;
if !moved && self.objects[&self.hovering.unwrap()].clickable {
return WorldOutcome::ClickedObject(self.hovering.unwrap());
}
let before = self.hovering;
self.hovering = ctx
.canvas
.get_cursor_in_map_space()
.and_then(|cursor| self.calculate_hover(cursor));
return if before == self.hovering {
WorldOutcome::Nothing
} else {
WorldOutcome::HoverChanged(before, self.hovering)
};
}
if let Some((_, dy)) = ctx.input.get_mouse_scroll() {
ctx.canvas.zoom(dy, ctx.canvas.get_cursor());
}
if ctx.redo_mouseover() {
if let Some(cursor) = ctx.canvas.get_cursor_in_map_space() {
let dx = cursor.x() - drag_from.x();
let dy = cursor.y() - drag_from.y();
self.dragging_from = Some((cursor, true));
return WorldOutcome::Dragging {
obj: self.hovering.unwrap(),
dx,
dy,
cursor,
};
}
}
return WorldOutcome::Nothing;
}
let cursor = if let Some(pt) = ctx.canvas.get_cursor_in_map_space() {
pt
} else {
let before = self.hovering.take();
return if before.is_some() {
WorldOutcome::HoverChanged(before, None)
} else {
WorldOutcome::Nothing
};
};
let mut neutral_outcome = WorldOutcome::Nothing;
if ctx.redo_mouseover() {
let before = self.hovering;
self.hovering = self.calculate_hover(cursor);
if before != self.hovering {
neutral_outcome = WorldOutcome::HoverChanged(before, self.hovering);
}
}
let mut allow_panning = true;
if let Some(id) = self.hovering {
let obj = &self.objects[&id];
if obj.clickable && ctx.normal_left_click() {
return WorldOutcome::ClickedObject(id);
}
if obj.draggable {
allow_panning = false;
if ctx.input.left_mouse_button_pressed() {
self.dragging_from = Some((cursor, false));
return neutral_outcome;
}
}
for (key, action) in &obj.keybindings {
if ctx.input.pressed(key.clone()) {
return WorldOutcome::Keypress(action, id);
}
}
}
if allow_panning {
ctx.canvas_movement();
if self.hovering.is_none() && ctx.normal_left_click() {
return WorldOutcome::ClickedFreeSpace(cursor);
}
} else if let Some((_, dy)) = ctx.input.get_mouse_scroll() {
ctx.canvas.zoom(dy, ctx.canvas.get_cursor());
}
neutral_outcome
}
fn calculate_hover(&self, cursor: Pt2D) -> Option<ID> {
let mut objects = 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| self.objects[id].zorder);
objects.reverse();
for id in objects {
let obj = &self.objects[&id];
if obj.draw_hover.is_some() && obj.hitbox.contains_pt(cursor) {
return Some(id);
}
}
None
}
pub fn draw(&self, g: &mut GfxCtx) {
for draw in &self.draw_master_batches {
draw.draw(g);
}
let mut objects = Vec::new();
for &(id, _, _) in &self.quadtree.query(g.get_screen_bounds().as_bbox()) {
objects.push(*id);
}
objects.sort_by_key(|id| self.objects[id].zorder);
for id in objects {
let mut drawn = false;
let obj = &self.objects[&id];
if Some(id) == self.hovering {
if let Some(ref draw) = obj.draw_hover {
draw.draw(g);
drawn = true;
}
if let Some(ref txt) = obj.tooltip {
g.draw_mouse_tooltip(txt.clone());
}
}
if !drawn {
obj.draw_normal.draw(g);
}
}
}
pub fn get_hovering(&self) -> Option<ID> {
self.hovering
}
pub fn override_tooltip(&mut self, id: &ID, tooltip: Option<Text>) -> bool {
if let Some(obj) = self.objects.get_mut(id) {
obj.tooltip = tooltip;
true
} else {
false
}
}
pub fn calculate_hovering(&self, ctx: &EventCtx) -> Option<ID> {
ctx.canvas
.get_cursor_in_map_space()
.and_then(|cursor| self.calculate_hover(cursor))
}
pub fn get_hovered_keybindings(&self) -> Option<&Vec<(MultiKey, &'static str)>> {
Some(&self.objects[&self.hovering?].keybindings)
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct DummyID(usize);
impl ObjectID for DummyID {}
impl World<DummyID> {
pub fn add_unnamed(&mut self) -> ObjectBuilder<'_, DummyID> {
self.add(DummyID(self.objects.len()))
}
}