From f92e9f6f07b1e3834c2ca58ce3510734819d08e4 Mon Sep 17 00:00:00 2001
From: Arne Dußin
Date: Wed, 27 Jan 2021 14:01:50 +0100
Subject: Rework graf karto to fit the client/server structure

---
 src/world/room.rs | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/world/room.rs

(limited to 'src/world/room.rs')

diff --git a/src/world/room.rs b/src/world/room.rs
new file mode 100644
index 0000000..fed8890
--- /dev/null
+++ b/src/world/room.rs
@@ -0,0 +1,52 @@
+//! 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::Component;
+use crate::math::{Polygon, Rect};
+use crate::transformable::NonRigidTransformable;
+use nalgebra::{Matrix3, Point2};
+use serde::{Deserialize, Serialize};
+
+/// A polygon shaped room, which can be placed and modified in the world.
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct Room {
+    shape: Polygon<f64>,
+}
+
+impl Room {
+    /// Create a new room with the given shape.
+    pub fn new(shape: Polygon<f64>) -> Self {
+        Self { shape }
+    }
+
+    /// Get the polygon this room is based on.
+    pub fn shape(&self) -> &Polygon<f64> {
+        &self.shape
+    }
+}
+
+impl Component for Room {
+    fn bounding_rect(&self) -> Rect<f64> {
+        Rect::bounding_rect_n(&self.shape.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 Room {
+    // XXX: This produces undefined behaviour when using a mirroring matrix, since
+    // the polygon corners must be sorted in counterclockwise direction.
+    fn apply_matrix(&mut self, matrix: &Matrix3<f64>) {
+        for corner in self.shape.corners_mut() {
+            *corner = matrix
+                .transform_point(&Point2::new(corner.x, corner.y))
+                .into();
+        }
+    }
+}
-- 
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