Add point after given distance on polyline or spline

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yetanotheruser
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Joined: Sat Dec 30, 2017 2:49 pm

Add point after given distance on polyline or spline

Post by yetanotheruser » Wed Oct 03, 2018 9:40 am

Imagine a spline (or polyline, as we can convert from spline to polyline) with a length of 10 cm. I want to add a point after a given distance, e.g. 3 cm.
The point shall not change the shape of the spline, but it shall be a point that's already on the spline but until now not selectable by me as an end-user, as I did not specify this point while creating the spline.

Finally I
- want to use the new "3 cm point" to draw a line that ends in this new "3 cm point"
- or want to extract the part from start/end of the spline until the "3 cm point".

How is that possible using QCAD?
Thanks :)

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Husky
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Re: Add point after given distance on polyline or spline

Post by Husky » Thu Oct 04, 2018 2:37 am

yetanotheruser wrote:
Wed Oct 03, 2018 9:40 am
- want to use the new "3 cm point" to draw a line that ends in this new "3 cm point"
This isn't clear to me. :oops:
Why do you need a point/node at that 3 cm point? For snapping the line to it?
yetanotheruser wrote:
Wed Oct 03, 2018 9:40 am
- or want to extract the part from start/end of the spline until the "3 cm point".
That is possible with the "Lengthen/Shorten (LE)" Tool if the entity is a line, arc or polyline. The same tool can be used for a workaround to find this 3 cm point for the line ...

An example dxf/dwg would help to get a better idea about what you are trying to accomplish ... :wink:
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