Request the top area of this slab?

[yongler]

I want to make GDL for floor slab accessories and request the top area of this slab. I wrote this: n = REQUEST("SLAB_TOP_SURF" , " " , _area ) But it was not successful. May I ask how to write this sentence?

[Pertti Paasky]

I think the object does not get the area information of the slab, but You can calculate the area from the point information.

https://www.wikihow.com/Calculate-the-Area-of-a-Polygon  this site tells how.

[Barry Kelly]

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@Pertti Paasky wrote:

I think the object does not get the area information of the slab

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This is correct.

@yongler 

SLAB_TOP_SURF is not for use in REQUEST commands.

It is a Global Variable that can be used only in lists or labels - i.e. a label can give you the area of a slab.

As Pertti suggests, you will have to calculate the area from the point information (nodes) of the slab.

I am not quite sure why you would want the area for an accessory object though?

Barry.