Add View

showbits-common/src/view.rs

@@ -0,0 +1,52 @@
+use crate::{Buffer, Rect, Vec2};
+
+// TODO Add Orientation (from inkfo)
+
+pub struct View<'a, C> {
+    area: Rect,
+    buffer: &'a mut Buffer<C>,
+}
+
+impl<'a, C> View<'a, C> {
+    pub fn new(buffer: &'a mut Buffer<C>) -> Self {
+        Self {
+            area: Rect::from_nw(Vec2::ZERO, buffer.size()),
+            buffer,
+        }
+    }
+
+    pub fn dup(&mut self) -> View<'_, C> {
+        View {
+            area: self.area,
+            buffer: self.buffer,
+        }
+    }
+
+    pub fn with_area(mut self, area: Rect) -> Self {
+        self.area = area;
+        self
+    }
+
+    pub fn translated(self, delta: Vec2) -> Self {
+        let area = self.area + delta;
+        self.with_area(area)
+    }
+
+    pub fn size(&self) -> Vec2 {
+        self.area.size()
+    }
+
+    fn pos_to_buffer_pos(&self, pos: Vec2) -> Vec2 {
+        pos + self.area.corner_nw()
+    }
+
+    pub fn at(&self, pos: Vec2) -> Option<&C> {
+        self.buffer.at(self.pos_to_buffer_pos(pos))
+    }
+
+    pub fn set(&mut self, pos: Vec2, color: C) {
+        if let Some(pixel) = self.buffer.at_mut(self.pos_to_buffer_pos(pos)) {
+            *pixel = color;
+        }
+    }
+}