# bound_width var (movable atom)

Source: https://ref.dm-lang.org/atom/movable/var/bound_width
Added in BYOND 490.

### Default value
> 32 (width of default icon; depends on world.icon_size)

This var defines the width of the physical atom's bounding box, in pixels. By default all atoms are assumed to be one tile in physical size.

Example: A 16×16 smiley face centered in a 32×32 icon should have a bound_width value of 16.

### See also
- [bound_x var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_x.md)
- [bound_y var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_y.md)
- [bound_height var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_height.md)
- [icon_w var (atom)](https://ref.dm-lang.org/atom/var/icon_w.md)
- [icon_z var (atom)](https://ref.dm-lang.org/atom/var/icon_z.md)
- [step_x var (movable atom)](https://ref.dm-lang.org/atom/movable/var/step_x.md)
- [step_y var (movable atom)](https://ref.dm-lang.org/atom/movable/var/step_y.md)
- [locs list var (movable atom)](https://ref.dm-lang.org/atom/movable/var/locs.md)
- [icon_size var (world)](https://ref.dm-lang.org/world/var/icon_size.md)
- [Pixel movement](https://ref.dm-lang.org/notes/pixel-movement.md)