topic Re: PolyOperation in GDL

PolyOperation

FerDE — Tue, 11 Jan 2022 00:59:25 GMT

Is There a way to get multiple subtractions to he same polygonusing?

Thx for your attention

ch = INITADDONSCOPE ("PolyOperations", "", "") PREPAREFUNCTION ch, "CreateContainer", "mySourceContainer", "" PREPAREFUNCTION ch, "CreateContainer", "myDestinationContainer", "" PREPAREFUNCTION ch, "SetSourceContainer", "mySourceContainer", "" PREPAREFUNCTION ch, "SetDestinationContainer", "myDestinationContainer", "" !!!=== 1th Polygon dim vertArr1[][] nVertices1 = 4 ii = 0 FOR i = 1 to vardim2(p1_coord) step 2 ii = 1 + ii vertArr1[ii][1] = p1_coord[1][i] vertArr1[ii][2] = p1_coord[1][i+1] vertArr1[ii][3] = 0 NEXT i ii = 0 PREPAREFUNCTION ch, "Store", "poly1_1", nVertices1, 1, vertArr1, nVertices1 !================ !!! holes polygons polyg_hole = 2 FOR iii = 1 to polyg_hole ii = 0 nVertices2 = N_polyg[iii] FOR i = 1 to nVertices2*2 step 2 ii = 1 + ii vertArr[ii][1] = pn_coord[iii][i] vertArr[ii][2] = pn_coord[iii][i+1] vertArr[ii][3] = 0 NEXT i ii = 0 nomepoly2 = "poly2_"+str(iii,1,0) PREPAREFUNCTION ch, "Store", nomepoly2, nVertices2, 1, vertarr, nVertices2 NEXT iii !!!! ===== 1th operation numPoly = CALLFUNCTION (ch, "poly1_1 - poly2_1", "", resPolyIDArray) !!!! ===== 2th operation polyXXX = ???????? !!=== result of first operation numPoly = CALLFUNCTION (ch, "polyXXX - poly2_2", "", resPolyIDArray) ......... !!! see this example https://gdl.graphisoft.com/reference-guide/polygon-operations-extension for i = 1 to numPoly polygonID = resPolyIDArray[i] gosub 100 ! Get one polygon contour data (without contours) fill 1 pen 1 if nsp > 0 then poly2_ nsp/3, 2, get(nsp) endif line_property 2 gosub 101 ! Draw one polygon contour lines next i

Re: PolyOperation

FerDE — Thu, 06 Jan 2022 11:44:27 GMT

Note; there is missing some code but, i hope, the question is clear.

Re: PolyOperation

Pertti Paasky — Tue, 11 Jan 2022 06:24:00 GMT

As far as I now You can execute only one operation at a time. For multiple operations You have to substract from the resulting polygon. I think it is easier to use the Dictionary (StoreDictPolygon -parameter etc.) type because the resulting polygon is ready to use in the next loop. The old way is tricky to use.

You can also define the polygon with holes if all holes are inside the contour.

Re: PolyOperation

Peter Baksa — Tue, 11 Jan 2022 09:45:43 GMT

Hi,

An operation always works on the source container, and puts the results in the destination container. The IDs of the resulting polygons are returned from CALLFUNCTION in resPolyIDArray. Re-define source and destination containers between operations (this doesn't change the content of the containers).

Be prepared that each operation can result in many polygons, if you are chaining operations the second operation has to be done on each of the results of the first. You can either keep track of returned polygon IDs from many calls, or disregard them and use GetDestinationPolygons to get the content ids when the container contains all results.