GridView: add range() function

add GridWindowIterator from RangeInclusive

src/grid/mod.rs

@@ -1,6 +1,6 @@
 use {
     std::{
-        ops::{Range}
+        ops::{Range, RangeInclusive}
     },
     cgmath::{Point2},
     crate::{
@@ -15,6 +15,24 @@ pub use offset::GridOffset;
 
 pub trait GridView = IndexView<Point2<i16>>;
 
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
+
+impl<Item> GridView<Item = Item> {
+    pub fn range(&self) -> RangeInclusive<Point2<i16>> {
+        let area = self.area().unwrap_or(Vec::new());
+
+        Point2::new(
+            area.iter().map(|p| p.x).min().unwrap_or(i16::MIN),
+            area.iter().map(|p| p.y).min().unwrap_or(i16::MIN)
+        ) ..=
+        Point2::new(
+            area.iter().map(|p| p.x).max().unwrap_or(i16::MAX),
+            area.iter().map(|p| p.y).max().unwrap_or(i16::MAX)
+        )            
+    }
+}
+
+
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
 
 pub struct GridWindowIterator {
@@ -31,6 +49,15 @@ impl From<Range<Point2<i16>>> for GridWindowIterator {
     }
 }
 
+impl From<RangeInclusive<Point2<i16>>> for GridWindowIterator {
+    fn from(range: RangeInclusive<Point2<i16>>) -> Self {
+        GridWindowIterator {
+            next: *range.start(),
+            range: *range.start() .. Point2::new(range.end().x+1, range.end().y+1)
+        }
+    }
+}
+
 impl Iterator for GridWindowIterator {
     type Item = Point2<i16>;