center w size

src/render/primitive/format.rs

@@ -1,10 +1,10 @@
-use crate::primitive::{Point, point::point};
+use crate::primitive::{Vec2, vec2::point};
 
 #[repr(C)]
 #[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable, Default)]
 pub struct UIPos {
-    pub anchor: Point,
-    pub offset: Point,
+    pub anchor: Vec2,
+    pub offset: Vec2,
 }
 
 impl UIPos {
@@ -15,6 +15,10 @@ impl UIPos {
         }
     }
 
+    pub const fn center() -> Self {
+        Self::anchor_offset(0.0, 0.0, 0.0, 0.0)
+    }
+
     pub const fn top_left() -> Self {
         Self::anchor_offset(-1.0, -1.0, 0.0, 0.0)
     }
@@ -23,6 +27,11 @@ impl UIPos {
         Self::anchor_offset(1.0, 1.0, 0.0, 0.0)
     }
 
+    pub const fn offset(mut self, offset: Vec2) -> Self {
+        self.offset = offset;
+        self
+    }
+
     pub const fn within(&self, region: &UIRegion) -> UIPos {
         let lerp = self.anchor_01();
         let anchor = region.top_left.anchor.lerp(region.bot_right.anchor, lerp);
@@ -30,7 +39,7 @@ impl UIPos {
         UIPos { anchor, offset }
     }
 
-    pub const fn anchor_01(&self) -> Point {
+    pub const fn anchor_01(&self) -> Vec2 {
         (self.anchor + 1.0) / 2.0
     }
 
@@ -67,6 +76,12 @@ impl UIRegion {
             bot_right: UIPos::bottom_right(),
         }
     }
+    pub fn center(size: Vec2) -> Self {
+        Self {
+            top_left: UIPos::center().offset(-size / 2.0),
+            bot_right: UIPos::center().offset(size / 2.0),
+        }
+    }
     pub fn within(&self, parent: &Self) -> Self {
         Self {
             top_left: self.top_left.within(parent),