topic SelectionSet objects in .NET Forum

SelectionSet objects

Anonymous — Wed, 08 Aug 2012 18:08:42 GMT

I'd like understand better how to deal with SelectionObj in SelectionSets..

How do i classify SelectionObj(s) as specific entities , like line2d,, so I can utilize them better with line2d methods..

would be better if i could prompt for lines and only allow lines for selection? is there such a function or do i program a IF that checks selectionSet and message user if some objects was not a linetype

my concept understanding is to:

for each selectionOBJ in selectionSET

trycast selectionObj.getobjectType, line2d

does that make sense?

i dont know how id put that in vb code.. if even possible. please point me in a direction. 'forgive my noobness

Re: SelectionSet objects

fxcastil — Wed, 08 Aug 2012 18:34:52 GMT

You want to learn to use selection set filters.

http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%20.NET%20Developer%27s%20Guide/index.html

There is a AutoCAD .NET Developer’s Guide available as a Pdf which has many samples of using selection set filters.

I could not find a link for the Pdf, maybe someone else can provide you a link.

Re : SelectionSet objects

_gile — Wed, 08 Aug 2012 20:30:36 GMT

Hi,

It looks like you're confusing Autodesk.AutoCAD.Gemometry.Line2d (which is a geometric object without graphic representation and which can't be select) with Autodaek.AutoCAD.DatabaseServices.Line (which is the graphic object you can select).

See this thread:

http://forums.autodesk.com/t5/NET/Entity-vs-Entity2d/td-p/3564086

Re : SelectionSet objects

Anonymous — Thu, 09 Aug 2012 17:59:17 GMT

ok thx fxcastil i looked at selection filters it will help me.

@ _gile

I see what u mean with difference in databaseservice vs. geometery objects

my goal: is to get a selection of lines. then access each individual lines X & Y (@endPoint) coordinates and change them individually.

I prompt for a Start point (which will not change x & y) ,, then i need to name this line and proceding lines in order,, like 1-2 ,2-3, 3-4 ect. These lines will almost close back onto the Start point.

from here, I calculate the distance in x & y needed for closure and adjust all the lines individually (but in proportion) so that they close a polygon.

THE MAIN idea is i need to read Start and End points on the selected lines INdividually and change with some calculated variables.

the calculations i can code myself. im comfortable enough with vb.net.. i just need to access some values.

IN Geomatics Engineering we call this "Compass Rule Adjustment"

I choose this as my starting project to learn Autocad.net programming.

Later i will do more complex projects for least square adjustments.

my problem i have a selectionSET of SelectionObj(s) .. (which i filter) so i know they are definitly lines

How do i classify them as such so i can access the X&Y properties to change them..

or How would YOU do this project?

not show me excatly, just some direction would help me learn myself.

I do have developer's Guide but it can be sometimes obscure for a new learner.

thanks in advance

edit:

my idea is to check each selected line IF Start coodinates = PrompPointResult.x and PrompPointResult.y THEN

that line.id = "1"

check IF line.id("1").x and line.id("1").y = check each selected line for match THEN label that match line.id = "2"

but how to syntax

Re : SelectionSet objects

Anonymous — Thu, 09 Aug 2012 18:17:20 GMT

should i first give all the selectionobjects aka.lines in my selectionset a typedvalue line "LINE"?

Re : SelectionSet objects

Hallex — Thu, 09 Aug 2012 20:15:48 GMT

You'll be more likely to show us your code you've started with

~'J'~

Re : SelectionSet objects

Anonymous — Thu, 09 Aug 2012 23:08:08 GMT

YES i solved my own problem, sry to waste your time guys

For Each obj As SelectedObject In MySelectedSet
Dim ent As Entity = trsAct.GetObject(obj.ObjectId, OpenMode.ForRead)
Dim line As Line = ent

now:

with the line variable i have access to X Y coordinates of lines start point and more methods related to lines specifically

from here things get easier.

now i just need to figure out how to give each line its own name.. it will be much more convienent than as refering to Ojectids.. blockName? no readonly

what is line.ownerId?

Re : SelectionSet objects

Anonymous — Thu, 09 Aug 2012 23:21:48 GMT

I think this is where dictionary comes to play. because there is no property to name my line i can perhaps attach a xrecord to the line's extentionDictionary and if i need that line , i can call it refering to the saved xrec.