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//! ECS components for Tiled objects.
//!
//! This module defines Bevy components used to represent Tiled objects within the ECS world.
use crate::prelude::{geo::Centroid, *};
use crate::tiled::helpers::iso_projection;
use bevy::prelude::*;
/// Relationship and Marker [`Component`] for the visual representation of a [`TiledObject`].
///
/// Added on the child [`Entity`] of a [`TiledObject::Tile`].
/// These entity have an associated [`Sprite`] and eventually a [`TiledAnimation`] component.
#[derive(Component, Reflect, Copy, Clone, Debug, Deref)]
#[reflect(Component, Debug)]
#[require(Visibility, Transform, Sprite)]
#[relationship(relationship_target = TiledObjectVisuals)]
pub struct TiledObjectVisualOf(pub Entity);
/// Relationship target [`Component`] pointing to a single child [`TiledObjectVisualOf`]s.
#[derive(Component, Reflect, Debug, Deref)]
#[reflect(Component, Debug)]
#[relationship_target(relationship = TiledObjectVisualOf)]
pub struct TiledObjectVisuals(Vec<Entity>);
/// Marker [`Component`] for a Tiled map object.
#[derive(Component, Default, Reflect, Clone, Debug)]
#[reflect(Component, Default, Debug)]
#[require(Visibility, Transform, TiledName)]
pub enum TiledObject {
/// A point shape.
#[default]
Point,
/// A rectangle shape.
///
/// Anchor is at the top-left corner of the rect.
Rectangle {
/// The width of the rectangle.
width: f32,
/// The height of the rectangle.
height: f32,
},
/// An ellipse shape.
///
/// Anchor is at the top-left corner of the ellipse.
Ellipse {
/// The width of the ellipse.
width: f32,
/// The height of the ellipse.
height: f32,
},
/// A polygon shape.
Polygon {
/// The vertices of the polygon, relative to object center.
vertices: Vec<Vec2>,
},
/// A polyline shape.
Polyline {
/// The vertices of the polyline, relative to object center.
vertices: Vec<Vec2>,
},
/// A tile object, which is a reference to a tile in a tilemap.
///
/// Anchor is at the bottom-left corner of the tile.
/// These objects have a child [`TiledObjectVisualOf`] entity holding
/// their visual representation, which is usually a [`Sprite`].
Tile {
/// The width of the tile.
width: f32,
/// The height of the tile.
height: f32,
},
/// A text object, which contains text data.
///
/// Not supported yet.
Text,
}
impl TiledObject {
const ELLIPSE_NUM_POINTS: u32 = 20;
/// Creates a new [`TiledObject`] from the provided [`tiled::ObjectData`].
pub fn from_object_data(object_data: &tiled::ObjectData) -> Self {
if object_data.tile_data().is_some() {
if let tiled::ObjectShape::Rect { width, height } = object_data.shape {
TiledObject::Tile { width, height }
} else {
warn!(
"Object with tile data should have a rectangle shape, but found {:?}",
object_data.shape
);
TiledObject::default()
}
} else {
match object_data.shape.clone() {
tiled::ObjectShape::Point { .. } => TiledObject::Point,
tiled::ObjectShape::Rect { width, height } => {
TiledObject::Rectangle { width, height }
}
tiled::ObjectShape::Ellipse { width, height } => {
TiledObject::Ellipse { width, height }
}
tiled::ObjectShape::Polygon { points } => TiledObject::Polygon {
vertices: points.into_iter().map(|(x, y)| Vec2::new(x, -y)).collect(),
},
tiled::ObjectShape::Polyline { points } => TiledObject::Polyline {
vertices: points.into_iter().map(|(x, y)| Vec2::new(x, -y)).collect(),
},
tiled::ObjectShape::Text { .. } => {
log::warn!("Text objects are not supported yet");
TiledObject::Text
}
}
}
}
/// Apply rotation and scaling to given coordinate.
fn apply_rotation_and_scaling(
inverse_rotation: bool,
vertex: Vec2,
transform: &GlobalTransform,
) -> Vec2 {
let mut rotation = transform.rotation().to_euler(EulerRot::ZYX).0;
if inverse_rotation {
rotation *= -1.;
}
let (cos, sin) = (rotation.cos(), rotation.sin());
Vec2 {
x: (vertex.x * cos - vertex.y * sin) * transform.scale().x,
y: (vertex.x * sin + vertex.y * cos) * transform.scale().y,
}
}
/// Returns the center position of the object in world space.
///
/// The center is computed from the object's vertices, taking into account its shape and transformation.
///
/// # Arguments
/// * `transform` - The global transform to apply to the object.
/// * `isometric_projection` - Wheter or not to perform an isometric projection.
/// * `tilemap_size` - Size of the tilemap in tiles.
/// * `grid_size` - Size of each tile on the grid in pixels.
/// * `offset` - Global map offset to apply.
///
/// # Returns
/// * `Option<geo::Coord<f32>>` - The computed center, or `None` if not applicable.
pub fn center(
&self,
transform: &GlobalTransform,
isometric_projection: bool,
tilemap_size: &TilemapSize,
grid_size: &TilemapGridSize,
offset: Vec2,
) -> Option<geo::Coord<f32>> {
geo::MultiPoint::from(self.vertices(
transform,
isometric_projection,
tilemap_size,
grid_size,
offset,
))
.centroid()
.map(|p| geo::Coord { x: p.x(), y: p.y() })
}
/// Returns the vertices of the object in world space.
///
/// Vertices are calculated based on the object's shape and its transformation (translation, rotation, scale).
/// For isometric maps, the vertices are projected through the isometric transformation.
///
/// # Arguments
/// * `transform` - The global transform to apply to the object.
/// * `isometric_projection` - Wheter or not to perform an isometric projection.
/// * `tilemap_size` - Size of the tilemap in tiles.
/// * `grid_size` - Size of each tile on the grid in pixels.
/// * `offset` - Global map offset to apply.
///
/// # Returns
/// * `Vec<geo::Coord<f32>>` - The transformed vertices.
pub fn vertices(
&self,
transform: &GlobalTransform,
isometric_projection: bool,
tilemap_size: &TilemapSize,
grid_size: &TilemapGridSize,
offset: Vec2,
) -> Vec<geo::Coord<f32>> {
// Get object world position
let object_world_pos = geo::Coord {
x: transform.translation().x,
y: transform.translation().y,
};
// Generate shape vertices relative to origin
match self {
TiledObject::Point | TiledObject::Text => vec![Vec2::ZERO],
TiledObject::Tile { width, height } => {
vec![
Vec2::new(0., 0.), // Bottom-left relative to object
Vec2::new(0., *height), // Top-left
Vec2::new(*width, *height), // Top-right
Vec2::new(*width, 0.), // Bottom-right
]
}
TiledObject::Rectangle { width, height } => {
vec![
Vec2::new(0., 0.), // Top-left relative to object
Vec2::new(*width, 0.), // Top-right
Vec2::new(*width, -*height), // Bottom-right
Vec2::new(0., -*height), // Bottom-left
]
}
TiledObject::Ellipse { width, height } => (0..Self::ELLIPSE_NUM_POINTS)
.map(|i| {
let theta =
2.0 * std::f32::consts::PI * (i as f32) / (Self::ELLIPSE_NUM_POINTS as f32);
let local_x = width / 2.0 * theta.cos() + width / 2.0;
let local_y = height / 2.0 * theta.sin() - height / 2.0;
Vec2::new(local_x, local_y)
})
.collect(),
TiledObject::Polyline { vertices } | TiledObject::Polygon { vertices } => {
vertices.clone()
}
}
.into_iter()
.map(|v| {
// Only perform isometric projection if requested by caller and if we do not handle a Tile
if isometric_projection && !matches!(self, TiledObject::Tile { .. }) {
let offset_projected = iso_projection(
Vec2::new(offset.x + v.x, offset.y - v.y),
tilemap_size,
grid_size,
);
let origin_projected = iso_projection(offset, tilemap_size, grid_size);
let relative_projected = offset_projected - origin_projected;
let v = Self::apply_rotation_and_scaling(true, relative_projected, transform);
geo::Coord {
x: object_world_pos.x + v.x,
y: object_world_pos.y - v.y,
}
} else {
let v = Self::apply_rotation_and_scaling(false, v, transform);
geo::Coord {
x: v.x + object_world_pos.x,
y: v.y + object_world_pos.y,
}
}
})
.collect()
}
/// Creates a [`geo::LineString`] from the object's vertices.
///
/// Returns `None` for point and text objects.
/// For ellipses, rectangles, tiles, and polygons, returns a closed line string.
/// For polylines, returns an open line string.
///
/// # Arguments
/// * `transform` - The global transform to apply to the object.
/// * `isometric_projection` - Wheter or not to perform an isometric projection.
/// * `tilemap_size` - Size of the tilemap in tiles.
/// * `grid_size` - Size of each tile on the grid in pixels.
/// * `offset` - Global map offset to apply.
///
/// # Returns
/// * `Option<geo::LineString<f32>>` - The resulting line string, or `None` if not applicable.
pub fn line_string(
&self,
transform: &GlobalTransform,
isometric_projection: bool,
tilemap_size: &TilemapSize,
grid_size: &TilemapGridSize,
offset: Vec2,
) -> Option<geo::LineString<f32>> {
let coords = self.vertices(
transform,
isometric_projection,
tilemap_size,
grid_size,
offset,
);
match self {
TiledObject::Point | TiledObject::Text => None,
TiledObject::Ellipse { .. }
| TiledObject::Rectangle { .. }
| TiledObject::Tile { .. }
| TiledObject::Polygon { .. } => {
let mut line_string = geo::LineString::from(coords);
line_string.close();
Some(line_string)
}
TiledObject::Polyline { .. } => Some(geo::LineString::new(coords)),
}
}
/// Creates a [`geo::Polygon`] from the object's vertices.
///
/// Returns `None` for polyline, point, and text objects.
/// For closed shapes, returns the corresponding polygon.
///
/// # Arguments
/// * `transform` - The global transform to apply to the object.
/// * `isometric_projection` - Wheter or not to perform an isometric projection.
/// * `tilemap_size` - Size of the tilemap in tiles.
/// * `grid_size` - Size of each tile on the grid in pixels.
/// * `offset` - Global map offset to apply.
///
/// # Returns
/// * `Option<geo::Polygon<f32>>` - The resulting polygon, or `None` if not applicable.
pub fn polygon(
&self,
transform: &GlobalTransform,
isometric_projection: bool,
tilemap_size: &TilemapSize,
grid_size: &TilemapGridSize,
offset: Vec2,
) -> Option<geo::Polygon<f32>> {
self.line_string(
transform,
isometric_projection,
tilemap_size,
grid_size,
offset,
)
.and_then(|ls| match ls.is_closed() {
true => Some(geo::Polygon::new(ls, vec![])),
false => None,
})
}
}
pub(crate) fn plugin(app: &mut App) {
app.register_type::<TiledObject>();
app.register_type::<TiledObjectVisualOf>();
app.register_type::<TiledObjectVisuals>();
}