1 files changed, 16 insertions, 0 deletions

diff --git a/src/utils.rs b/src/utils.rs
index 8c3b144..0825c8c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,6 +1,7 @@
 use crate::{
     app::AppState,
     consts::FONT_PATH,
+    bitmap::{abs_difference, MapPoint},
     lisp::{
         error::{EvalError, LispError, ParseError},
         eval::Evaluator,
@@ -132,6 +133,21 @@ pub fn compress<T: PartialEq + Clone>(scanline: &[T]) -> Vec<(T, usize)> {
     runs
 }
 
+pub fn rect_coords(s: MapPoint, e: MapPoint) -> (MapPoint, MapPoint) {
+    let (width, height) = (abs_difference(s.x, e.x), abs_difference(s.y, e.y));
+    let start_loc = if e.x >= s.x && e.y >= s.y {
+        (s.x, s.y)
+    } else if e.x >= s.x && e.y < s.y {
+        (s.x, e.y)
+    } else if e.x < s.x && e.y >= s.y {
+        (e.x, s.y)
+    } else {
+        (e.x, e.y)
+    }.into();
+    let end_loc = start_loc + (width, height).into();
+    (start_loc, end_loc)
+}
+
 #[cfg(test)]
 mod tests {
     use super::compress;