Draw lines with exact length

Hello everyone!

At first I want to say that I am not a programmer, I am a civil engineer, but I have one idea, that I want to realize, so I’m asking for your opinion.

I would like to have a possibility, where a user could draw simple lines, but with exact length (5000mm, 3150mm, 3950mm etc). Something very easy, where a user could just click and see the lines. Together these lines would make a floor plan for a house. These lines don’t have to have thickness, because it will be just a sketch where walls are located. After user has drawn the sketch i would need the program to generate a text file with coordinates of the lines.

I hope very much for your guidelines or suggestions in what programming language this could be done so I could start to search for people who now such programming language, and have more detailed talk, or can this be done at all. So far i have been told that this program could be made and putted in the web page, so people could draw on the internet. There is a second way I have been told, the way when user just clicks on “exe” file and window opens where user can draw, and then just press some button to generate the file.

Wishing good luck at works,
Raivis