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//! Polygon rooms are the standard rooms in graf karto. They can take the form of anything that a
//! [Polygon](crate::math::Polygon) can have.
use super::Mappable;
use crate::colours::DEFAULT_COLOURS;
use crate::math::{self, Polygon, Rect, Triangle};
use crate::transform::Transform;
use crate::transformable::NonRigidTransformable;
use crate::FLOAT_MARGIN;
use nalgebra::{Matrix3, Point2};
use raylib::drawing::{RaylibDraw, RaylibDrawHandle};
use std::ops::Deref;
/// Data type for the Polygon room.
pub type PolygonRoomData = Polygon<f64>;
/// A polygon room, which can be placed and modified in the world.
pub struct PolygonRoom {
data: PolygonRoomData,
// The polygon shape, but in triangles, so the polygon does not have to be triangulated every frame.
triangulated: Vec<Triangle<f64>>,
selected: bool,
}
impl PolygonRoom {
/// Create a room from the given polygon data.
pub fn from_data(data: PolygonRoomData) -> Self {
Self {
data: data.clone(),
triangulated: math::triangulate(data, FLOAT_MARGIN),
selected: false,
}
}
// When the internal polygon changes, it must be retriangulated to be drawn on the screen
// properly, so this function must be called any time that happens.
fn retriangulate(&mut self) {
self.triangulated = math::triangulate(self.data.clone(), FLOAT_MARGIN);
}
}
impl Mappable for PolygonRoom {
fn draw(&self, rld: &mut RaylibDrawHandle, transform: &Transform) {
for triangle in &self.triangulated {
rld.draw_triangle(
transform.point_m_to_px(&triangle.corners()[0]),
transform.point_m_to_px(&triangle.corners()[1]),
transform.point_m_to_px(&triangle.corners()[2]),
if self.selected() {
DEFAULT_COLOURS.room_selected
} else {
DEFAULT_COLOURS.room_normal
},
)
}
}
fn set_selected(&mut self, selected: bool) {
self.selected = selected;
}
fn selected(&self) -> bool {
self.selected
}
fn bounding_rect(&self) -> Rect<f64> {
Rect::bounding_rect_n(&self.data.corners())
}
fn as_non_rigid(&self) -> Option<&dyn NonRigidTransformable> {
Some(self as &dyn NonRigidTransformable)
}
fn as_non_rigid_mut(&mut self) -> Option<&mut dyn NonRigidTransformable> {
Some(self as &mut dyn NonRigidTransformable)
}
}
impl NonRigidTransformable for PolygonRoom {
fn apply_matrix(&mut self, matrix: &Matrix3<f64>) {
for corner in self.data.corners_mut() {
*corner = matrix
.transform_point(&Point2::new(corner.x, corner.y))
.into();
}
self.retriangulate();
}
}
impl Deref for PolygonRoom {
type Target = PolygonRoomData;
fn deref(&self) -> &Self::Target {
&self.data
}
}
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