probleme rotation coordinate

[Gerday.M]

Hi everybody,

I`m going to try to be clear, but I have juste one problem with the coordinate about a rotate rectangle.

So, first I have this data, and when I put in Excel I have a right rectangle.

SO now I know that I have to modify the data with the rotation, It`s what I did.

It worked very well, I tried with graph and to modify the degree of rotation it was perfect I had good rotated rectangle.
My next step and final step was just to put the coordinate on excel and reproduce the same rectangle on one graph in Excel.
And it`s there that I met the problem.

I have no Idea why, and I don`t see what to change to fix that......

I now that just one rotation of 90 degree it`s enough to correct the position but where can I change something?

If somenody know something about that or have the solution, you`re welcome.

Sorry about this big post but I think is more clear with picture than more text.

Thank you again for your answers (in advance)

Maxime

[RavensFan · Accepted solution]

Direction of rotation?

In Excel, it looks like a postive rotation causes it to rotate clockwise.

I didn't dig into your math, but in a lot of programs (like Autocad), a positive rotation angle is counter clockwise following the right hand rule.  Where 0 is the + X axis and a line from there rotates towards the + Y axis with a + angle.

[Gerday.M]

Yes Thanks you a lot.

We just found the solution at the same time.

You`re right!!!!!

I`m feel really relieved