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The object.on.land command restricts a screen object from going entirely on water (areas where priority does not equal 3).


object.on.land(obj oA);


Unlike the object.on.water command, the object.on.land command does not restrict screen object oA to only land (i.e. priority pixels > 3). Instead, as long as at least one pixel of the object's baseline is on a non-water pixel, the movement is allowed.

At the start of the next interpreter cycle after object.on.land is executed, AGI will shuffle the position of the object if it is currently entirely on water.

The object.on.land and object.on.water commands do not work on the ego object. Although ego will be repositioned if entirely on water by shuffling as described above, at the end of each interpreter cycle AGI automatically clears any land or water restriction on ego.

Possible Errors

AGI does not check that screen object number oA is a valid screen object. If it is not, this command will overwrite other data on the memory heap, which may cause unexpected results, including possibly crashing AGI.

DO NOT use the object.on.land and object.on.water commands on a screen object at the same time; they do not cancel each other out. If both commands are active on the same screen object, AGI will lock up, because it will enter a never ending loop trying to find a position. Make sure you use the object.on.anything command before switching between object.on.land and object.on.water.


 #define cat o1  
... [ initialize object  
object.on.land(cat);     [ cats hate water
object.on.anything(cat); [ teach cat to swim
object.on.water(cat);    [ now cat loves the water; won't come out!

Technical Information

Required Interpreter Version: Available in all AGI versions.
Byte-Code Value: 65 (0x41 hex)

See Also