code/__HELPERS/view.dm

/proc/view_to_pixels	Takes a string or num view, and converts it to pixel width/height in a list(pixel_width, pixel_height)
DEFAULT_SIGHT_DISTANCE	Frustrated with bugs in can_see(), this instead uses viewers for a much more effective approach.
CAN_I_SEE	Basic check to see if the src object can see the target object.
CAN_THEY_SEE	Checks the visibility between two other objects.
CAN_SEE_RANGED	Further checks distance between source and target.

Define Details

Basic check to see if the src object can see the target object.

Further checks distance between source and target.

Checks the visibility between two other objects.

Frustrated with bugs in can_see(), this instead uses viewers for a much more effective approach.

Things to note:

Src/source must be a mob. viewers() returns mobs.
Adjacent objects are always considered visible. The default tile-distance between two atoms for one to consider the other as visible.