Initial work on proper character movement

src/fighter/ecb.rs

@@ -4,12 +4,18 @@ use bevy::prelude::*;
 /// the stage. Purely geometry — the collision response lives in
 /// [`super::collision`].
 #[derive(Component, Debug, Clone, Copy)]
-#[require(Transform)]
+#[require(FighterPreviousECB)]
 pub struct FighterECB {
     pub vertical_half: f32,
     pub horizontal_half: f32,
 }
 
+#[derive(Component, Debug, Clone, Copy, Default)]
+pub struct FighterPreviousECB {
+    pub vertical_half: f32,
+    pub horizontal_half: f32,
+}
+
 impl FighterECB {
     pub fn to_3d_lineloop(&self, trf: Transform) -> [Vec3; 4] {
         let rel_up = trf.transform_point(Vec3::new(0.0, self.vertical_half, 0.0));
@@ -18,4 +24,22 @@ impl FighterECB {
         let rel_right = trf.transform_point(Vec3::new(self.horizontal_half, 0.0, 0.0));
         [rel_up, rel_right, rel_down, rel_left]
     }
+
+    pub fn get_bottom_point(&self) -> Vec2 {
+        Vec2::new(0.0, -self.vertical_half)
+    }
+}
+
+impl FighterPreviousECB {
+    pub fn to_3d_lineloop(&self, trf: Transform) -> [Vec3; 4] {
+        let rel_up = trf.transform_point(Vec3::new(0.0, self.vertical_half, 0.0));
+        let rel_down = trf.transform_point(Vec3::new(0.0, -self.vertical_half, 0.0));
+        let rel_left = trf.transform_point(Vec3::new(-self.horizontal_half, 0.0, 0.0));
+        let rel_right = trf.transform_point(Vec3::new(self.horizontal_half, 0.0, 0.0));
+        [rel_up, rel_right, rel_down, rel_left]
+    }
+
+    pub fn get_bottom_point(&self) -> Vec2 {
+        Vec2::new(0.0, -self.vertical_half)
+    }
 }