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6.1.7 Exchange cons: E>CH

This non-terminal command has sub-commands for exchanging two construction (swapping places) in their entirety: foreground, background and extension. If any of the following positions are referencing either of the exchanging places, they are updated to point to the exchanged places.

Each sub-command is non-input and represents a particular place mapping.

CH>HVR

Every sub-command works in the same way: they immediately exchange the selected construction with the one given by its particular mapping. These sub-commands have the following meanings:

H

horizontal reflection. Inverts the start facing direction of guards and the kid, and current facing direction of character instances as well.

V

vertical reflection

R

random place within the currently selected room

To apply the exchange to constructions of an entire room see Exchange cons: E>RH.