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More flexible interaction area than boundary box

I have tried to create an interaction area that is more flexible than a simple boundary box. Implementing a first extension in bevy_interact_2d, I got as far as the code below, but I assume this is much easier done with better support for a ‘contains’ method on the lyon side, so I raised an issue at bevy_prototype_lyon. i don't think what I do here is perfect, I would feel much better about re-using an existing geometry type.

pub enum InteractionArea {
  BoundingBox(Vec2, Vec2),
  Triangle(Vec2, Vec2, Vec2),
}

/// A convenience thing, so existing bounding boxes just need `.into()`
impl From<(Vec2, Vec2)> for InteractionArea {
  fn from((corner1, corner2): (Vec2, Vec2)) -> Self {
    InteractionArea::BoundingBox(corner1, corner2)
  }
}

/// This component makes an entity interactable with the mouse cursor
#[derive(Component)]
pub struct Interactable {
  /// The interaction groups this interactable entity belongs to
  pub groups: Vec<Group>,
  /// The interaction area for the interactable entity
  pub interaction_area: InteractionArea,
}

impl Interactable {
  fn contains(&self, cursor: &Vec2) -> bool {
    match self.interaction_area {
      InteractionArea::BoundingBox(corner1, corner2) => {
        (corner1.x..corner2.x).contains(&cursor.x) && (corner1.y..corner2.y).contains(&cursor.y)
      }
      InteractionArea::Triangle(a, b, c) => Triangle {
        a: point2(a.x, a.y),
        b: point2(b.x, b.y),
        c: point2(c.x, c.y),
      }
      .contains_point(point2(cursor.x, cursor.y)),
    }
  }
}

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