topic Re: Polygon operations in Libraries & objects

Polygon operations

Anonymous — Thu, 26 Nov 2009 15:10:41 GMT

Is there someone willing to show an example of use of the "polyoperations" functions?
Please!!!
I can't find my way in using this function.

Re: Polygon operations

Laszlo Nagy — Thu, 26 Nov 2009 18:37:05 GMT

Does this page help?
Would be helpful to put your AC version in your signature.

AC12:
http://www.graphisoft.com/ftp/techsupport/documentation/developer_docs/BasicLibraryDoc/12/Window-Macros/PolygonOperations.html

AC13:
http://www.graphisoft.com/ftp/techsupport/documentation/developer_docs/BasicLibraryDoc/13/Window-Macros/PolygonOperations.html

Re: Polygon operations

Anonymous — Fri, 27 Nov 2009 09:38:24 GMT

Thanks Laszlo,
but i was more thinking about the Polyop extension (ch=INITADDONSCOPE ("PolyOperations ", "", "")) which is said by Zsolt to be a more effective way to do such operations.
Although I will look with this macro.
But that would be very very very nice to see just a little example of use of the extension to see how we can use it. The source containers etc.. are a bit difficult to understand from scratch.
Maybe there is an object in the library using it?
Thanks in advance,
olivier

AC v13, winVista

Re: Polygon operations

ztaskai — Fri, 27 Nov 2009 10:49:23 GMT

There is an example object called PolyOperations_Example.gsm in the Sample Objects folder of the Basic Library.

You can download it from http://www.graphisoft.com/support/developer/downloads/

The extension is much more effective and capable than the macro indeed!

Regards,

Re: Polygon operations

Anonymous — Fri, 27 Nov 2009 15:40:53 GMT

Thanks a lot!
BTW I have been trying to use the polyoperations macro to calculate areas, but it appears to me that the results are bit different than what they should be. (if i draw a polygon and see the area)
Is that a bug?
You can't use the addon to calculate areas, can you?
(in that case it is not documented in the manual)
thanks,
regards,
olivier

Re: Polygon operations

ztaskai — Fri, 27 Nov 2009 17:05:45 GMT

Olivier wrote:
I have been trying to use the polyoperations macro to calculate areas, but it appears to me that the results are bit different than what they should be. (if i draw a polygon and see the area)
Is that a bug?

It can be considered as a bug, sure. Please report the details and we'll see about the priority.

Olivier wrote:
You can't use the addon to calculate areas, can you?
(in that case it is not documented in the manual)

The documentation is complete - consequently there is no area calculation. One reason to include it would be to completely replace the old macro...

Regards,

Re: Polygon operations

Anonymous — Mon, 30 Nov 2009 12:49:46 GMT

Here is the code from the Polygonoperations.gsm macro:

----
area=0

tempNumPnts = nsp/3

areaLX = get(1) ! Last point
areaLY = get(1)
!!ziiz=get(1)
areaFX = areaLX ! First point
areaFY = areaLY

for areaI=1 to tempNumPnts-1
areaX = get(1)
areaY = get(1)
!!ziiz=get(1)
area = area + (areaX + areaLX) * (areaY - areaLY) * 0.5

areaLX = areaX
areaLY = areaY
next areaI
area = area + (areaFX + get(1)) * (areaFY - get(1)) * 0.5

-------

I add this in the beginning to give my polygon:
-------
for i=1 to vardim1(ac_coords)
put ac_coords[2],ac_coords[3],0
next i

------
ac_coords comes from the accessories API

but the resulting area is totally false...

I don't understand this code anyway which should call 3 times "get" per loop but "gets" only 2 times per loop.
Is there something obvious that I missed?

Thanks in advance,
Olivier

Re: Polygon operations

Anonymous — Tue, 01 Dec 2009 08:17:43 GMT

Ok, I think I fixed the little bug in the macro:
--
for areaI=1 to tempNumPnts-1
---
should be
--
for areaI=1 to tempNumPnts-2
--
now it seems to work.

However it doesn't work if there are holes in the polygon.
Some more work should fix this second problem.

Re: Polygon operations

Anonymous — Tue, 01 Dec 2009 08:39:26 GMT

and added of course this ziiz=get(1) in the loop to get 3 times instead of 2

Re: Polygon operations

ztaskai — Tue, 01 Dec 2009 09:54:09 GMT

The macro is designed to handle 2D polygons defined by two coordinate points. You modified it to handle 3 coordinates per point:)

Regs,

Re: Polygon operations

Anonymous — Wed, 02 Dec 2009 12:52:29 GMT

The array it is supposed to take in is based on a three dimesnional input, the third dimension being the arc.
Of course it is a 2d polygon, the notion of polygon being defined by points in the same plane.
So imo it is a bug.

This is how the macro is introduced:

600:
! ==============================================================================
! Calculate polygon area
! ==============================================================================
! Input:
! srcPolygon1: input source of polygon 1 (INPUT_NO, INPUT_FROM_PARAMETER, INPUT_FROM_GDL_STACK)
! polygon1: input polygon 1
! srcPolygon2: input source of polygon 2 (INPUT_NO, INPUT_FROM_PARAMETER, INPUT_FROM_GDL_STACK)
! polygon2: input polygon 2
! result: output result (OUTPUT_TO_PARAMETER, OUTPUT_TO_GDL_STACK)
! GDL stack: coordX[1], coordY[1], arc[1], ...
!
! Output:
! area: area of polygon
! GDL stack: [1]: area of polygon
! ==============================================================================
! Remarks:
! The input polygon must have closed
! ==============================================================================
regards,
O

Re: Polygon operations

Pertti Paasky — Tue, 22 Dec 2009 10:50:31 GMT

With the polygonoperations you can define polygon 1:

"PREPAREFUNCTION ch, "Store", "poly1", nVertices1, nContours1, vertArr1, contArr1,
defaultInhEdgeInfo, inhEdgeInfos1

Is it possible to use this information in another object in the same project?

Re: Polygon operations

Hmooslechner — Mon, 04 Apr 2022 12:42:45 GMT

Are there any now functioning examples for the "polygon-operations-addin" for GDL to download here somewhere?

i tried to get a "profile-manager-profile" for working as a path for a Window-Opening and want to get this Path-Polygone smaller as a frame in the polygone and have to polygone-operate this path smaller.

The old link down in this task is erroring 404... file not found..

https://graphisoft.com/support/developer/downloads/

What i trie to do:

here is my link to my Testfile:

https://www.dropbox.com/s/ku1pu4eook36i9a/Freiformfenster%20mit%202%20Profilen.pln?dl=0