Make a line with a angle relative to another line

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Make a line with a angle relative to another line

hesediel
Hello guys, i'm sorry for the question but i am trying to draw a line with an angle but this relative to another line. How can i do that?
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Re: Make a line with a angle relative to another line

ravas
You can use modify → rotate
and choose to keep the original, or make copies.
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Re: Make a line with a angle relative to another line

ravas
In reply to this post by hesediel
There is also line → relative angle
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Re: Make a line with a angle relative to another line

dxli
In reply to this post by hesediel
it's a good thing if we can have angular "Relative Zero".

seems to be easy to implement:

1, relative zero for input polar coordinates;
2, relative zero for output (coordinate widget);
3, an action to change angular relative zero.

Before that, we can do the following:

To draw a line by an angle relative to to line A:

1, rotate line A to horizontal, keep the old copy;
2, draw a line by angle;
3, rotate the new line from step 2 and line A back, delete old copy;
4, delete duplicated copy of line A.



hesediel wrote
Hello guys, i'm sorry for the question but i am trying to draw a line with an angle but this relative to another line. How can i do that?
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Re: Make a line with a angle relative to another line

hesediel
In reply to this post by ravas
i tryied the angle relative but its complicated, puts the line in the middle and several times isnt at the lenght i wrte.


the rotate it can work, but then how can i resize the rotated new line at a wanted lenght?
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Re: Make a line with a angle relative to another line

dxli
you can always use "Modify -> Scale"

using one end point as reference, and isotropic scaling.

hesediel wrote
i tryied the angle relative but its complicated, puts the line in the middle and several times isnt at the lenght i wrte.


the rotate it can work, but then how can i resize the rotated new line at a wanted lenght?
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Re: Make a line with a angle relative to another line

dxli
Another feature not so difficult to implement:

when command widget is activated, *i.e.* user is typing a command:

1, figure out the command is waiting for coordinates (the default), supply coordinates as candidate for command;
2, if user is waiting for angle supply the angle relative to the current relative zero;

even easier to implement, create special variables for command line:

"xy/cartesian"
"theta"

for example.

dxli wrote
you can always use "Modify -> Scale"

using one end point as reference, and isotropic scaling.

hesediel wrote
i tryied the angle relative but its complicated, puts the line in the middle and several times isnt at the lenght i wrte.


the rotate it can work, but then how can i resize the rotated new line at a wanted lenght?
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Re: Make a line with a angle relative to another line

abi12
In reply to this post by hesediel
Hop; you can respond to a different question.  My Selection does not work.  Only on 'Angle BETWEEN lines'.  What shall I do?  thanks!   gripwin@gmail.com
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update

abi12
How to do?