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
You want to learn to use selection set filters.
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.
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:
ok thx fxcastil i looked at selection filters it will help me.
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
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
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
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?
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.