going from 1.4 to latest, need guidance about earcut

[robertleeplummerjr]

I will mention that most of the axes do seem to touch the original location, which you can just barely make out if you squint.

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Even if you don't have the answer, I'm sure the art is entertaining.

[robertleeplummerjr]

The outputs of the first polygon:

old:

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new:

[1.5,0.5,139.5,139.5,138.5,137.5,137.5,136.5,135.5,135.5,134.5,133.5,133.5,132.5,131.5,131.5,130.5,129.5,129.5,128.5,127.5,127.5,126.5,125.5,125.5,124.5,123.5,123.5,122.5,121.5,121.5,120.5,119.5,119.5,118.5,117.5,117.5,116.5,115.5,115.5,114.5,113.5,113.5,112.5,111.5,111.5,110.5,109.5,109.5,108.5,107.5,107.5,106.5,105.5,105.5,104.5,103.5,103.5,102.5,101.5,101.5,100.5,99.5,99.5,98.5,97.5,97.5,96.5,95.5,95.5,94.5,93.5,93.5,92.5,91.5,91.5,90.5,89.5,89.5,88.5,87.5,87.5,86.5,85.5,85.5,84.5,83.5,83.5,82.5,81.5,81.5,80.5,79.5,79.5,78.5,77.5,77.5,76.5,75.5,75.5,74.5,73.5,73.5,72.5,71.5,71.5,70.5,69.5,69.5,68.5,67.5,67.5,66.5,65.5,65.5,64.5,63.5,63.5,62.5,61.5,61.5,60.5,59.5,59.5,58.5,57.5,57.5,56.5,55.5,55.5,54.5,53.5,53.5,52.5,51.5,51.5,50.5,49.5,49.5,48.5,47.5,47.5,46.5,45.5,45.5,44.5,43.5,43.5,42.5,41.5,41.5,40.5,39.5,39.5,38.5,37.5,37.5,36.5,35.5,35.5,34.5,33.5,33.5,32.5,31.5,31.5,30.5,29.5,29.5,28.5,27.5,27.5,26.5,25.5,25.5,24.5,23.5,23.5,22.5,21.5,21.5,20.5,19.5,19.5,18.5,17.5,17.5,16.5,15.5,15.5,14.5,13.5,13.5,12.5,11.5,11.5,10.5,9.5,9.5,8.5,7.5,7.5,6.5,5.5,5.5,4.5,3.5,3.5,2.5,1.5,1.5,139.5,137.5,137.5,135.5,133.5,133.5,131.5,129.5,129.5,127.5,125.5,125.5,123.5,121.5,121.5,119.5,117.5,117.5,115.5,113.5,113.5,111.5,109.5,109.5,107.5,105.5,105.5,103.5,101.5,101.5,99.5,97.5,97.5,95.5,93.5,93.5,91.5,89.5,89.5,87.5,85.5,85.5,83.5,81.5,81.5,79.5,77.5,77.5,75.5,73.5,73.5,71.5,69.5,69.5,67.5,65.5,65.5,63.5,61.5,61.5,59.5,57.5,57.5,55.5,53.5,53.5,51.5,49.5,49.5,47.5,45.5,45.5,43.5,41.5,41.5,39.5,37.5,37.5,35.5,33.5,33.5,31.5,29.5,29.5,27.5,25.5,25.5,23.5,21.5,21.5,19.5,17.5,17.5,15.5,13.5,13.5,11.5,9.5,9.5,7.5,5.5,5.5,3.5,1.5,1.5,137.5,133.5,133.5,129.5,125.5,125.5,121.5,117.5,117.5,113.5,109.5,109.5,105.5,101.5,101.5,97.5,93.5,93.5,89.5,85.5,85.5,81.5,77.5,77.5,73.5,69.5,69.5,65.5,61.5,61.5,57.5,53.5,53.5,49.5,45.5,45.5,41.5,37.5,37.5,33.5,29.5,29.5,25.5,21.5,21.5,17.5,13.5,13.5,9.5,5.5,5.5,1.5,133.5,133.5,125.5,117.5,117.5,109.5,101.5,101.5,93.5,85.5,85.5,77.5,69.5,69.5,61.5,53.5,53.5,45.5,37.5,37.5,29.5,21.5,21.5,13.5,5.5,5.5,133.5,117.5,117.5,101.5,85.5,85.5,69.5,53.5,53.5,37.5,21.5,21.5,5.5,117.5,117.5,85.5,53.5,53.5,21.5,117.5]

?

[mourner]

The outputs of the first triangle

You mean the inputs of the first polygon?

[mourner]

Can you try using this function for flattening https://github.com/mapbox/earcut/blob/master/test/test.js#L85-L101 and seeing if it works? Perhaps some indices math mismatch.

[robertleeplummerjr]

I'm getting ready to try it, and thank you for pointing out my error, indeed I meant polygon (corrected). I'm curious, though, if the points are all longitudes and latitudes of a certain type, why would there be an index starting at: [1.5,0.5,...? I plan on posting my findings here. We will get through this one together!

[mourner]

Looks like part of the problem is this:

pixel = L.glify.latLonToPixelXY(triangles[i], triangles[i + 1]);

Since triangles are indices to rawVerts elements, you can't convert them to pixels like that - they're indices, not coordinate values.

But I still don't get why would the indices be non-integer (0.5, etc.). Can you provide an exact sample array input to earcut that produces such a weird result?

[robertleeplummerjr]

I need to cross reference them to get their pixels, how would you suggest I do that?

[robertleeplummerjr]

Here is the input file: https://github.com/robertleeplummerjr/Leaflet.glify/blob/master/CZDistricts.json

[mourner]

I need to cross reference them to get their pixels, how would you suggest I do that?

Take a look at how the viz script does that. Something like toPixel(rawVerts[triangles[i]], rawVerts[triangles[i] + 1]).

[robertleeplummerjr]

Using that exact code does help a bit. Progress:

More very enjoyable art. I'm sure I'll figure it out, thanks for the help.

[robertleeplummerjr]

Will it matter if I give coordinates vs pixels?

[robertleeplummerjr]

Ok, so I started from scratch with the original, and no glify code to simplify the process of upgrade, and I get the same results: http://rawgit.com/robertleeplummerjr/1437e67a5d5501748d1c/raw/09eb0c83cf9f7b26628247e13d51213915f431ef/index.html

[robertleeplummerjr]

Gist here: https://gist.github.com/robertleeplummerjr/1437e67a5d5501748d1c

[mourner]

@robertleeplummerjr here's how you should use the returned indices: https://github.com/mapbox/earcut/blob/master/viz/viz.js#L59

[robertleeplummerjr]

I believe I've updated it to reflect the above, but I don't even get an output now: https://gist.github.com/robertleeplummerjr/1437e67a5d5501748d1c

I'm flattening data here: https://gist.github.com/robertleeplummerjr/1437e67a5d5501748d1c#file-index-html-L142
I'm using the preferred return index here: https://gist.github.com/robertleeplummerjr/1437e67a5d5501748d1c#file-index-html-L148
I'm also still using the same means of plotting the points that I used 1.4 here: https://gist.github.com/robertleeplummerjr/1437e67a5d5501748d1c#file-index-html-L153

I'm sure I'm doing something wrong. Any more suggestions?

[mourner]

Eh, I'm afraid you'll have to go through the earcut viz script yourself and figure out why it produces correct visual output and yours doesn't. Don't give up :)

[robertleeplummerjr]

I don't get it. The script was practical with version 1.4.2, and now there is no known upgrade path from a completely working and perfectly valid geojson file? And how is this a closed issue? My point was not
answered, even it is me that needs to find the solution. Do you not feel anyone else will be upgrading from 1.4.2?

[jfirebaugh]

@robertleeplummerjr This is an open source project and @mourner has generously given you plenty of free guidance. All indications are this is a bug in your code -- it's time to step up to the plate and investigate the matter yourself.

[robertleeplummerjr]

challenge accepted.

[robertleeplummerjr]

working. Thanks for your help. robertleeplummerjr/Leaflet.glify@ff279f0#diff-d0afc23070fd2eeb72f8362e659b089dR723

[mourner]

Thank you for understanding! I didn't know the change could cause so much trouble, should have worked on a proper upgrade guide. What was the issue in the end? Flipped coordinates?

[robertleeplummerjr]

It all good. It ended up being flipped coordinates, and a lack of understanding what values were being returned from the call. No sweat, in fact have it working great here: http://robertleeplummerjr.github.io/Leaflet.glify/

Click on any poly. This should look familiar, it was originally created by @Sumbera. I just turned it into a lib.

For handling the latitude or longitude first, I ended up doing this: https://github.com/robertleeplummerjr/Leaflet.glify/blob/master/glify.js#L20 and this: https://github.com/robertleeplummerjr/Leaflet.glify/blob/master/glify.js#L628

So now I don't have to worry about it. Thanks for your hard work @mourner, and as well @jfirebaugh!