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real vs paper scale

Created by: Neon22

In order to label a value as 12km but not to make an image that actual size. How about adding a drawing scale factor as well. So user can indicate distance is 12km. Then also indicate that scale is 1:100000 - which will make it 12cm across. Or perhaps 1:500000 which would make it 2.4cm long. A precalculation (not sure its possible) would indicate if this scaled the bounds of the drawing off the page.

Then you can print this paper scale as well. So users know that measurements taken off the drawing are to what scale. Common scales are different for Architects and Engineers but you could offer a dropdown:

Of course the crazy US still in inches which adds weird scales to those in "common" use. http://www.aaadrafting.com/drafting-tools-techniques/engineeringscales.html

For inches 1:1, 1:2, 1:4, 1:8, 1:16, 1:24, 1:32, 1:48, 1:64, 1:96, 1:128 For metric 1:1, 1:10, 1:5, 1:50, 1:10, 1:100, 1:20, 1:200, 1:1250, 1:2500 1:2, 1:20, 1:500, 1:1000 1:25, 1:250, 1:331⁄3

Here's the number in a list for copy/paste [1, 2, 4, 5, 8, 10, 16, 24, 25, 32, 33.333, 48, 50, 64, 96, 100, 128, 200, 250, 500, 1000, 1250, 2500] with these two as non-preferred [25, 33.333]

Factors of 100 times these for the Km problem :) But here is another list organised by usage:

Here are some reference pictures of how the scale factor is normally drawn:

Related topic - Check out how cool this is: