Hi

I have 2 bars on each side, position and sizes are dynamic, I need to build and arch on top of these bars joining like yellow highlightes in the picture below, I must go with dynamically provide slope in a function and the arch center will be the absolute center of the 2 side bars. I am stuck trying to make it work. can anyone please help me?

My suggestion would be to try to make the arch by yourself. As a hint, you can split the problem into two smaller problems:

**mathematics**: if you have the coordinates of the beginning and end of the arch, and the angle, calculate the coordinates of the top middle joint**graphics**: having two points, draw a bar from the first point to the second point

If you solve these two problems, you have everything in order to make the arch.

hi @PavelBoytchev

thanks for the suggestions, I have the 2 points cordinates yes but I am unable to find the center point Y (YUP) based in an angle provide, say I am looking to set a 30 degree slope, how do I calculate the Y position (top point of the arch) basen on a 30 degree slope up from the side bars?

Here is the next hint. The mathematical problem can be illustrated with this picture:

The angle *α* is known (30° or any other degrees). The distance *d* can be calculated by the positions of the two vertical bars, so *d* is also known. However, *h* is unknown. Do you know how to calculate *h* with trigonometric functions?

that “h” is exactly I am looking for, I am not sure how to calculate h

The half arch is a right triangle. So, it is possible to use the tangent function:

*tan(α) = h / (d/2)*

so

*h = tan(α)·d/2*.

thank you, working on it