Topic: Hatch Area Doubt

[TopoWAR]

Hi Everyone!
Here with a question, I have 2 hatch, but one of them gives me the area, I would like to know why, that was formed this hatch is it impossible to calculate the area, thanks for your help.

[Lee Mac]

Haven't looked at your drawing as yet, but I think the Area property can be inaccessible if the hatch has a self-intersecting boundary.

[TopoWAR]

Master Lee Mac, you can see the attachment to see because you can calculate the area in one of the hatch.
thanks master.

[BuckoAk]

Hi Everyone!
Here with a question, I have 2 hatch, but one of them gives me the area, I would like to know why, that was formed this hatch is it impossible to calculate the area, thanks for your help.

Take a look at the attached file, after regenerating the hatch boundary's I found that the left side is composed of inner and outer polylines.  while the right side is composed of multiple hatch boundary's, in order to pull an area from a hatch it must be closed and one continuous segment like your example on the left.

Hope this helps

[cmwade77]

Haven't looked at your drawing as yet, but I think the Area property can be inaccessible if the hatch has a self-intersecting boundary.

I recreated the boundaries and I think you are correct, there appear to be self intersecting boundaries (cause by overlapping lines on the closed plines) on the hatch that the area doesn't show on.

[roy_043]

Haven't looked at your drawing as yet, but I think the Area property can be inaccessible if the hatch has a self-intersecting boundary.

What does 'inaccessible' mean? Is the area property not available? Will vla-get-area error out? I am asking because BricsCAD does not have this issue.

[HasanCAD]

Give attached a try

[Lee Mac]

Haven't looked at your drawing as yet, but I think the Area property can be inaccessible if the hatch has a self-intersecting boundary.

What does 'inaccessible' mean? Is the area property not available? Will vla-get-area error out? I am asking because BricsCAD does not have this issue.

Performing (vlax-dump-object) on a hatch with a self-intersecting boundary yields the following for the Area property:

Code: [Select]

;   Area (RO) = AutoCAD.Application: Invalid input
Attempting to retrieve the area for such object:

Code: [Select]

Command: (vla-get-area (vlax-ename->vla-object (car (entsel))))

Select object: ; error: Automation Error. Invalid input

Code: [Select]

Command: (vlax-get (vlax-ename->vla-object (car (entsel))) 'area)

Select object: ; error: AutoCAD.Application: Invalid input
The Properties Palette also does not list an area.

[Tharwat]

Haven't looked at your drawing as yet, but I think the Area property can be inaccessible if the hatch has a self-intersecting boundary.

What does 'inaccessible' mean? Is the area property not available? Will vla-get-area error out? I am asking because BricsCAD does not have this issue.

If I may , it is neither in AutoLISP as Lee earlier approved it and in C# , here is my program in C# confirming the same error message:

[roy_043]

Hasan, Lee and Tharwat, thank you for your clarifications.