Posted by Bob on Jun 21, 2013; 8:07pm
URL: https://forum.librecad.org/The-drawing-an-elipse-with-four-particular-points-on-the-x-y-aixs-tp5708421p5708424.html

Hey LordOfBikes and thanks for the very quick response,

I'm using LC version 2.0.0 beta1

What you've done is exactly what I did but what I'm trying to get to is a point where when I enter in the coordinates for the first point of the ellipse which let's say is as per my example of -100,-20 then at the -20 point this stays as the widest point of the final ellipse. The same with the second point or 100,-20. If this was actually the case then the widest point of the whole ellipse horizontally measured would be between the two -20 points. At the moment this isn't the case as as you can see when you complete the ellipse and measure the widest point is at around 0 on the y axis which isn't what I'm trying for.

It may well be that I simply can't achieve what I'm trying to achieve and I'll have to just accept it.

The problem is to get the right overall shape the template in plan view requires the widest point of the fuselage to move down below the horizontal center line or z axis as you move towards the nose and this is why I'm trying to get the widest point to stay at the coordinates I'm measuring and entering for the individual sectionals based on the coordinates from the side and plan view drawings.

It's not too easy to explain on a thread but thanks for trying to help anyway and thanks to Armin for the fix.

Cheers.