When setting the stroke-width of a line, the stroke width appears to change in Inkscape (okay.. good). However I believe the amount that it changes is not actually equal to the value set. For example, when changing the stroke-width, I can see the outline of the stroke changing (blue lines) and they are grossly outside of the actual stroke coloured in black. Both change when changing the stroke-width, but the stroke itself seems to not be filled in to the value set (defined by the blue lines I'm assuming). Image below to explain this.
There are 2 other diagnostic problems which I think are also related to the problem:
A) when zooming in, the stroke-width seems to decrease (physically I think this should increase since the stroke width is set constant by me (1mm for example). Image below to explain this.
B) when saving the image as a either a .pdf or an .eps, or even exporting it as a .pdf, the stroke-widths are not as they appear in the .svg file when displayed in Inkscape. Image below to explain this. This is the main problem, that the stroke-width displayed in Inkscape is not constant when zooming and that therefore the stroke-width which appears in Inkscape (at a particular zoom) is not what is displayed after saving the image (to a .pdf for example).
Maybe I'm doing something wrong with the way in which I'm defining the stroke? Does anyone know what I'm doing wrong to not 'permanently' set the stroke-width to it's real/user-defined units?
I am in 'Normal' mode, not 'Outline' mode.