diff -r 8a0d69c16cad -r 9c817b2eedae rust/landgen/src/template_based.rs
--- a/rust/landgen/src/template_based.rs	Wed Oct 31 23:36:05 2018 +0100
+++ b/rust/landgen/src/template_based.rs	Thu Nov 01 02:55:22 2018 +0300
@@ -1,7 +1,6 @@
 use itertools::Itertools;
 
-use integral_geometry::Point;
-use integral_geometry::Rect;
+use integral_geometry::{Point, Size, Rect};
 use land2d::Land2D;
 use LandGenerationParameters;
 use LandGenerator;
@@ -9,8 +8,7 @@
 struct OutlinePoints {
     islands: Vec<Vec<Point>>,
     fill_points: Vec<Point>,
-    width: usize,
-    height: usize,
+    size: Size,
 }
 
 impl OutlinePoints {
@@ -33,18 +31,14 @@
                         }).collect()
                 }).collect(),
             fill_points: outline_template.fill_points.clone(),
-            width: outline_template.width,
-            height: outline_template.height,
+            size: outline_template.size
         }
     }
 
-    fn for_each<F: Fn(&mut Point)>(&mut self, f: F) {
-        self.islands
-            .iter_mut()
+    fn iter_mut(&mut self) -> impl Iterator<Item = &mut Point> {
+        self.islands.iter_mut()
             .flat_map(|i| i.iter_mut())
             .chain(self.fill_points.iter_mut())
-            .into_iter()
-            .for_each(f);
     }
 
     fn distort<I: Iterator<Item = u32>>(&mut self, random_numbers: &mut I) {
@@ -55,8 +49,7 @@
 struct OutlineTemplate {
     islands: Vec<Vec<Rect>>,
     fill_points: Vec<Point>,
-    width: usize,
-    height: usize,
+    size: Size,
     can_flip: bool,
     can_invert: bool,
     can_mirror: bool,
@@ -82,23 +75,22 @@
         let mut points =
             OutlinePoints::from_outline_template(&self.outline_template, random_numbers);
 
-        let mut land = Land2D::new(points.width, points.height, parameters.basic);
+        let mut land = Land2D::new(points.size, parameters.basic);
 
         let top_left = Point::new(
             (land.width() - land.play_width() / 2) as i32,
             (land.height() - land.play_height()) as i32,
         );
 
-        points.width = land.width();
-        points.height = land.height();
+        points.size = land.size();
 
-        points.for_each(|p| *p += top_left);
+        points.iter_mut().for_each(|p| *p += top_left);
 
         // mirror
         if self.outline_template.can_mirror {
             if let Some(b) = random_numbers.next() {
                 if b & 1 != 0 {
-                    points.for_each(|p| p.x = land.width() as i32 - 1 - p.x);
+                    points.iter_mut().for_each(|p| p.x = land.width() as i32 - 1 - p.x);
                 }
             }
         }
@@ -107,7 +99,8 @@
         if self.outline_template.can_flip {
             if let Some(b) = random_numbers.next() {
                 if b & 1 != 0 {
-                    points.for_each(|p| p.y = land.height() as i32 - 1 - p.y);
+                    points.iter_mut().for_each(|p|
+                        p.y = land.height() as i32 - 1 - p.y);
                 }
             }
         }
@@ -131,10 +124,9 @@
     let mut points = OutlinePoints {
         islands: vec![vec![]],
         fill_points: vec![Point::new(1, 1)],
-        width: 100,
-        height: 100,
+        size: Size::square(100)
     };
 
-    points.for_each(|p| p.x = 2);
+    points.iter_mut().for_each(|p| p.x = 2);
     assert_eq!(points.fill_points[0].x, 2);
 }