Help with WME API to add roundabout helping

[davipt]

Hello all,

I need some help from any WME API experts to try to implement a helping function for roundabouts. The end result is to be offered to an existing script or released as a standalone script.

The idea is to provide a visual guidance to the roundabout rules at the wiki, so editors can put the nodes at the right place to obtain the right instructions.

The problem is that at the moment I'm trying to change the highlights script and trying to draw some lines when a node is selected, as the node selection binding is already implemented there, but I don't know yet how to draw the lines.

For the first version I'd like to assume the roundabout is a pure circle, and draw 6 lines from the selected node to the opposite directions of the roundabout, marking the 3x2 relevant angles - 90+-30, 180+-30, 270+-30, so one can know where to put the other nodes to obtain the "straight ahead/turn left/turn right" or, when it's not perpendicular, the right "take the nth exit".

For completeness, the context is that in Portugal we have hundreds, if not some thousands of roundabouts, and after struggling with broken roundabouts, now I'm struggling to get the right instructions and have the script help me instead of putting a ruler over the screen.

Any WME script expert out there to help me?

PS: I've already pinged timbone to ask him this feature and offer my help and keep him posted of my progress.

[Timbones]

It could be an interesting feature (thank you for your PM), but unfortunately I don't know how add new lines to the editor. So far, I've only hacked the lines that already exist on the map.

Twister's scripts are able to add boxes on top of the map, but I think that he's using a separate canvas on top of WME.

If you want to do it properly, have a look at the OpenLayers API - this is what WME uses to draw the road data.

[davipt]

Status update: based on the existing scripts, I can now understand a node click, understand it's a roundabout, collect all roundabout nodes and segments. Now I'll try to understand the OpenLayers from the UR script...

[davipt]

Status Update: as a side effect, I can now automatically create roundabout junction landmarks based on the roundabout geometry >:) Maybe I should keep this as a secondary feature

Screen Shot 2012-11-23 at 4.28.18 PM copy.jpg (27.98 KiB) Viewed 2829 times

[davipt]

And we have a prototype!

Screen Shot 2012-11-23 at 6.19.51 PM copy.jpg (25.22 KiB) Viewed 2816 times

[Timbones]

Good work!

via mobile

[zCougar]

This looks cool. I also thought about implementing this but you are already there. Would like to use that as soon as possible

--
Cougar

[davipt]

Here's a first version, please handle with care and provide as much feedback as possible

http://userscripts.org/scripts/show/152981

[Dennis_Halmstad]

Its a gr8 start.

It seams that it dont work if u use tampermonkey in chrome.
Its the way this script get acces to WME that causes problems. Other scripts with unsafeWindow works.

[davipt]

Its a gr8 start.

It seams that it dont work if u use tampermonkey in chrome.
Its the way this script get acces to WME that causes problems. Other scripts with unsafeWindow works.

I've just copied verbatim what the other scripts were doing. I don't use chrome (I hate a browser that consumes 300MB every other week of my limited disk space) but I'll have a look at it when I can. I've tested it without any tampermonkey extension, and it was working out of the box.