Posted by claus82 on May 11, 2013; 10:13pm
URL: https://forum.librecad.org/Create-points-with-X-abscissa-and-Y-ordinate-on-plumb-line-tp5708045p5708057.html

Ok,
I just need to understand, be patient but my english is reeeeally rusted
Then you know ABCD coordinates and you need the coordinates of points 1,2,3 and 4 in you picture?

More important, look my picture here:


...so:
10.23 = segment AB
5.23= segment AP
8.28 = segment AQ
2.89 = segment 1P
-3.13 = segment 2Q

angles with arc and dot are 90°

Is this correct??

FIRST PART: if what I've written above is correct, it is very easy to do:
- Use the command "modify-rotate" twice on the segment AB and Keep the original, first on poit P then on point Q, you'll have 2 lines (let's call them "s" and "t")
- Create two circles with centres in P and Q with the radiuses 2.89 and 3.13
-Activate the intersection snap and check where the circles encounters lines "s" and "t"
- look down on the left where I'm indicating on my pic down here, those are the coordinates!!!





SECOND PART: I am afraid I cannot help you on the second part: look down here


we can have infinite points that can satisfy your problem, because we can have infinite lines that can be put on plumb (I've put 3 points and 3 lines differently coloured just to explain the concept)!!!
Just by looking at your picture I think that you maybe miss some data... When you solve triangles you need to know at least 2 sides and a angle, or 2 angles and a side...
Sorry man... I can't help you...
I hope that someone else can!


P.S. In case you have more data, just let me know, perhaps I can help you!