wip: broken collect enum

crates/tek_core/src/render_axis.rs

@@ -0,0 +1,35 @@
+use crate::*;
+
+macro_rules! impl_axis_common { ($A:ident $T:ty) => {
+    impl $A<$T> {
+        pub fn start_inc (&mut self) -> $T {
+            self.start = self.start + 1;
+            self.start
+        }
+        pub fn start_dec (&mut self) -> $T {
+            self.start = self.start.saturating_sub(1);
+            self.start
+        }
+        pub fn point_inc (&mut self) -> Option<$T> {
+            self.point = self.point.map(|p|p + 1);
+            self.point
+        }
+        pub fn point_dec (&mut self) -> Option<$T> {
+            self.point = self.point.map(|p|p.saturating_sub(1));
+            self.point
+        }
+    }
+} }
+
+pub struct FixedAxis<T> { pub start: T, pub point: Option<T> }
+impl_axis_common!(FixedAxis u16);
+impl_axis_common!(FixedAxis usize);
+
+pub struct ScaledAxis<T> { pub start: T, pub scale: T, pub point: Option<T> }
+impl_axis_common!(ScaledAxis u16);
+impl_axis_common!(ScaledAxis usize);
+impl<T: Copy> ScaledAxis<T> {
+    pub fn scale_mut (&mut self, cb: &impl Fn(T)->T) {
+        self.scale = cb(self.scale)
+    }
+}