How to draw a fixed line based on Orientaion

Good day

Where a user clicks a line or must be drawn showing the orientation
Where the user clicks I store its point in an array
I have another array with different orientations

How do I draw a Fixed line of length(3)[arrow] from 1 point in the direction of the orientation

Idea on how to go about doing it

Regards

By keeping the coordinate of the other axis?

Cheers,
_

Basically, my idea is
After user clicks a point
I have to create another point in the orientation from the initial point
and draw a line between them

Is there a function out there
that accepts Initial point, and an orientation -> showOrientation(1stPoint, Orientation)
and does the math?

Orientation as in Qt::Orientation?

Btw, you will also need a distance

Cheers,
_

Sloved! it was more of a math problem

my solution:

Code:

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newEndPoint.setX(x1 + length*cos(theta));
newEndPoint.setY(y1 + (length*sin(theta)));

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Kind Regards