firstly, thanks a lot for developing and providing this awesome software!
I have two darts that are located on the same edge. I think that I have to true them. At least I did that in the past, using the “True dart” tool of Seamly, and the results were good. The difference is that I only had one dart on the same edge so far.
In the following screenshot you can see the relevant part of my current pattern. I put red lines as an overlay to mark where the darts should be. How can I true both of them?
Left dart used A and A1 as the base points, and A6,A4, A7 as the dart points. The dart tool creates the new dart points A10 and A11. The right dart then used points A11 and A1 as the base points, and A8, A5, A9 as the dart points. It creates the new dart points A12 and A13.
I then extended Line_A_A10 to A14 usinf the angle of Line_A_A10. The using the intersect line and axis tool found the intersect point A15, and connected A10 to A15 and A15 to A11.
Repeated the same with the 2nd dart.
So when tracing the pattern piece I would use points A, A15, A11, A17, A13, and A1. Darts could be added with internal paths A10, A4, A11, and A12, A5, and A13.
Thanks a lot @Douglas , that worked great! I adapted my pattern and quickly tried out the result with paper. The edge is now perfectly straight after applying the darts.
I noticed that the new edge (marked with yellow in my screenshot) is now significantly shorter than the “old” one (light blue):
Since this is the back of a trouser, 0.6cm missing would yield 1.2cm missing on the waist. Am I correct?
Is there a standard procedure to accomodate for that? I sketched in purple what I would do naively: Adapt the pattern with a new point X. Length of line X to A24 would be the difference between the blue and yellow lines (so 0.6cm). Then smoothly blend it in again with the original perpendicular line from A24.
If you’re making custom pants I would just add at the center back seam 1-2 cm for the base length. Your normally going to close the back seam up to fit the waist anyways. It’s always a good idea to have a litte extra seam allowance on the back seam anyways.
Since I was always making pants for costume rental, I always added an inch on each side of the CB seam to allow a couple inches of alteration.
Also, we need an Insert Dart Tool.
Inputs:
P1 - Begin seampoint.
P2 - End seampoint.
N - Distance of dart from P1.
W - Dart width.
L - Dart length.
A - Dart angle relative to Line_P1_P2.
This tool would create 10 child objects so the user no longer has to do this manually. Updating the inputs atu-updates these objects:
4 dart points:
Dv - Dart vertex.
D1 & D2 - 2 leg points.
Df - Foldpoint between D1 & D2.
4 dart lines:
Line_Dv_D1.
Line_Dv_D2.
Line D1_Dm.
Line_D2_Dm.
2 seam lines:
Line_P1_D1.
Line_P2_D2.
Not all darts are on a seam… such those in the middle of a jacket. In which case it would make sense to create a dart of a given length, width, and angle around a center point.
