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#1 Posted : Wednesday, January 17, 2007 4:43:18 AM(UTC)

marasma  
marasma

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Hi,
How can I delete the last segment of a Annpolyline or similar wile I drawing it?
I just try to delete the last annpoint in drawdesigner, but it fails, and drawdesigner points collection is always empty!.
I'm using LT14.5 with VB.NET and I manage annotation without AnnAutomation, but in manual mode.
Thanks!
 

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#2 Posted : Thursday, January 18, 2007 5:30:53 AM(UTC)

Qasem Lubani  
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Did you try to use the RasterCollection.Remove Method for this?

 
#3 Posted : Tuesday, January 30, 2007 12:11:59 AM(UTC)

marasma  
marasma

Groups: Registered
Posts: 51


Thanks!
I found the solution, I delete the right point in the rastercollection and in the controlpoints collection.
Now I have to add a point in a AnnPolylineObject at the mouse location! I think I can use the same method of the delete function, but I need to know between wich two points of the polyline I have to add the new one! How can I identify them?
I'm using LT 14.5 with VB.NET
Thanks
 
#4 Posted : Wednesday, January 31, 2007 6:35:24 AM(UTC)

Adnan Ismail  
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One way to do that is to go through all line segments and check if the new point lies between the segment's 2 ends.
If the segment points are (X1, Y1) and (X2, Y2), and the new point is (Xn, Yn), the 2 conditions for non-vertical segments are:
(Y2-Y1)/(X2-X1) = (Yn-Y1)/(Xn-X1)
AND
X1<Xn<X2
Of course there are other cases (e.g when X1=X2=Xn) where you need to modify the formula.

 
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