calculate the Length off a polyline from begin till a point

[Vrijbuiter]

I want to know the length of a line from the begin till the point where
I click or where the line cross a other line.
I can get the line and i can find where the intersection points are
with VBA but I can NOT find a function that calculate the the exact
length from begin to the intersection.
Can anyone help me to find the good way.


Thanks,

Alexander
Holland

[Wyatt Earp]

What you want is the distance between the intersection point and one of
the endpoints of the line segment.

Assuming the intersection point's coordinates are given by
ix and iy and the line segment's endpoint coordinates are given by ex
and ey the distance d would be:

d = Sqrt(((ix-ex)*(ix-ex))+((iy-ey)*(iy-ey)))

I'm not sure if Sqrt() is a valid VBA function, I typically use a C#
over the VBA API, but the math is correct.




Vrijbuiter wrote:

I want to know the length of a line from the begin till the point
where
I click or where the line cross a other line.
I can get the line and i can find where the intersection points are
with VBA but I can NOT find a function that calculate the the exact
length from begin to the intersection.
Can anyone help me to find the good way.


Thanks,

Alexander
Holland

[Vrijbuiter]

Dear Wyatt Earp

Thanks for your answer.
The function you use call at visual basic -> CalculateSquareRoot =
Sqr(NumberArg)
But the problem is that a polyline not a strait line but a combination
of more line's and arc's is, so I hope you see my problem.

Alxander
>From Holland