Some (very) important and meaningful JOSM questions

Posted by Litvania on 30 April 2017 in English (English)

I need answers to these questions, otherwise i will never achieve what i would want to with Litvania. Whenever i search it up there are little helpful results.

  • How do we (can we even?) draw lines at only 90° and 45° angles? In Inkscape it is Shift.

  • How do we accurately plan scaling? Like how can i draw my drawing at an appropriate scale on paper, and make sure it works here.

  • How do people draw things like this, and when i draw an plan and then trace, i end up with this.

Location: Nové Mesto, Lorava, Hlavné mesto Lorava, Litvensko

Comment from eklas on 30 April 2017 at 18:30

  • When drawing lines, somewhere on the left side of the grey bottom panel, there's a display that shows the angle between the cursor position, the base node and the previous node.

  • Scaling hand drawing is easy. Set 1 cm= something and then just draw whatever feels right (I assume you can draw an approximately centimeter long line without a ruler).

  • ??? Are you using the PicLayer plugin? It allows you to set a picture as background, so just take a photo of your drawing, set it as background and reposition/rescale it as needed.

hope this helps

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Comment from Litvania on 30 April 2017 at 18:58

@eklas, the first two are great, thanks! For the third questions, yes, i am using the PicLayer plugin, however when i trace houses along the street, the are all separate, so each house is actually at a different angle to the straight street. With other places i have seen, the side on the street is directly paralell to the street itself, thats the issue.

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Comment from wangi on 30 April 2017 at 19:16

Press "a" to align paths while you draw them. Snaps to 30, 45, 90 degree etc.

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Comment from eklas on 30 April 2017 at 19:20

Oh, now I see. If you look really closely, not even the houses in Kirchenburg are perfectly paralell to the street, but the difference is negligible. Zoom in or decrease your mouse sensitivity, if you're still unable to get decent results.

Or if you want to have perfectly aligned blocks of houses, you can make a paralell line to the street, place nodes on it where the buildings meet and then split it. Then make even lines going out of the nodes at 90°, then connect the outer ends of those and create closed objects connecting them using 'c'.

Or orthogonalize using 'q' and then use shift+ctrl to rotate.

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Comment from eklas on 30 April 2017 at 19:22

@wangi how did i not know this? thanks you've augmented my josm knowledge

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Comment from wangi on 30 April 2017 at 19:40

You can also align to an existing path.

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Comment from Myrcia on 30 April 2017 at 20:20

It depends really on the effect you are after for the street. I think one of the most jarring things about Lorava is the fact that none of your buildings seem to be built with 90 degree angles. Even in historic city centres 90 degree angles are the rule because the strongest and simplest buildings are made from rectangles. Even if buildings are odd shapes they are don't look like the polygons that you've created in Lorava.




With the street line I think you'd find most buildings meet the pavement parallel to the line of the street because builders want to make the most of their plots of land. Therefore you can create a parallel way of your street in JOSM and build backward from that then delete the way. Or you can have straight streets, use the Q tool to create orthogonal buildings and then align them to the street (this is what I do 90% of the time).

I use the Q key on most buildings that I create. Most buildings in the real world are orthogonal.

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Comment from Aces California on 30 April 2017 at 21:14

I do have to echo Myrcia, I ALWAYS use Q when using JOSM to create nice squared off buildings. You'd need to guestimate the shape of buildings around corners, but when you go down streets, you use Q an aweful aweful lot.

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Comment from zhenkang on 1 May 2017 at 05:42

I also needed this guide. Thanks!

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Comment from skquinn on 3 May 2017 at 08:49

You can also customize the angles to which the draw tool snaps (triggered with "A" as wangi mentioned) in JOSM's preferences. By default it snaps to 0, 30, 45, 60, 90, 120, 135, 150, and 180. I added 15, 75, 105, and 165 just for completeness; the only other one I can think of that might be somewhat useful is 22.5 and multiples thereof (i.e. halfway between 45-degree snaps) but I'm not sure if it accepts decimal angles.

The "orthagonalize shape" tool (triggered with "Q") cannot be thusly configured as far as I know; however, you can choose the "base" angle to which it snaps by selecting two nodes in addition to a way (I think).

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