Gmap.NET drawing routes with spikes on certain zoom levels

Question

I'm using the Gmap.NET control to draw routes on maps which works basically fine, but on certain zoom levels it creates those "spikes" on some tour stations. Especially when the way to the station is the same as when leaving it again.

Example with a spike (station 3):

Correct plotting of the route when zooming one level further down:

I hope the problem is clear.

Any ideas what this is and how to handle it?

Edit: This is one of the routes creating the issue. stations:

0 = 53.42853, 9.94964
1 = 53.4234, 10.0205 
2 = 53.36294, 9.98961
3 = 53.22015, 10.17786
4 = 53.23748, 10.15987
5 = 53.42853, 9.94964

And the whole routing: https://nopaste.xyz/?272dc860d24033de#GqwkHCVP88IB/SdXzJFzTCSJqjfdM7cX20/qoyCOVbY=

Thank you, Michel.

@gunnerone, I've added the stations and the pointlist of the route. — DrSeuthberg, Jul 30 '18 at 15:05
Here's what I get: https://pasteboard.co/HwS4GcY.png Does this show the issue? Do I need to be at a specific zoom? — gunnerone, Jul 30 '18 at 15:49
I'm afraid it doesn't because you are just _beelining_ the stations of the route. Please see the whole point list I have attached via the nopast.xyz link. — DrSeuthberg, Jul 31 '18 at 06:38
I'm having a hard time identifying the "spikes" at any zoom level. Here's what I get with all of the points: https://pasteboard.co/Hx0ILNR.png https://pasteboard.co/Hx0KsTe.png — gunnerone, Jul 31 '18 at 13:53
I got v1.7.5 of both GMap.NET.Core and GMap.NET.WindowsForms. I tentatively reduced the line width to 2px. Helps a little, but problem still exists. — DrSeuthberg, Aug 02 '18 at 11:40

score 1 · Accepted Answer · answered Aug 14 '18 at 14:12

1

I tried to load your route coordinates and test them on the map and i didn't see the problem exactly.

While searching, i found an answer for your prolem in this link How can I get rid of these 'spike' visual artifacts when drawing with WPF?, the question was for the WPF version but you will get the idea.

in short, the problem was in the Route Line Joins Type (Miter, Bevel, Round) like in this image:

answered Aug 14 '18 at 14:12

Ahmed GIS

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Sorry for the late response, I lost track of the issue. But this is the correct answer. Very helpful, thanks a ton. – DrSeuthberg Oct 12 '18 at 14:45

Gmap.NET drawing routes with spikes on certain zoom levels

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