[Qgis-user] Circular Lines in QGIS

[C Hamilton]

The arrow line renderer is close to what I want but only does a simplistic
curve. In the example, notice how lines emerge at different bearings
depending on the number of lines coming to or from each node. Also the
curves are circular in nature but not a circular arc. They are more of a
spline.

I thought it was worth asking to see if anyone had any idea on how to do
this. Maps like this look nice, but I don't know how to implement it in
QGIS.

Calvin

On Wed, Sep 26, 2018 at 6:36 PM, Alexandre Neto <senhor.neto at gmail.com>
wrote:

> Check the arrow line renderer on QGIS 3. I think it does what you are
> looking for.
>
>
> A qua, 26/09/2018, 23:04, Adam Dershowitz <dersh at alum.mit.edu> escreveu:
>
>> No, they aren’t great circle.  For example, look at the route from Boston
>> to Denver, and then from New York to Denver.  One goes far south (over
>> Atlanta), and the other goes way north (over Canada), but both great circle
>> routes should be fairly close to each other.  They start at cities that are
>> perhaps 200 miles apart, and the middle of the routes are 700 miles apart,
>> to get to the same location.
>>
>>
>> --Adam
>>
>>
>>
>> On Sep 26, 2018, at 5:54 PM, Wolstan H M Dixie <
>> wolstan-dixie at hotmail.co.uk> wrote:
>>
>> I don't know but am guessing, but aren't those lines not just *any*
>> circular arcs, but the actual great-circle paths (the shortest line between
>> two points on the surface of a globe) plotted onto that map projection?
>> Some of them towards the edges aren't circular.
>>
>> On 26/09/2018 21:34, C Hamilton wrote:
>>
>> I had a user request Circular Lines in the Shape Tools plugin and they
>> gave the following example.
>>
>> https://www.stayaspensnowmass.com/sites/default/files/aspenFlightMap.jpg
>>
>> I don't know how one would do this type of drawing. Does anyone have any
>> ideas? It draws the lines trying to avoid overlapping other lines in a very
>> pleasing manner. Doing this is probably outside the scope of the Shape
>> Tools plugin, but I just wanted to ask to see if there is a relatively easy
>> algorithmic way of drawing these types of lines between two points.
>>
>> Thanks,
>>
>> Calvin
>>
>>
>>
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> --
> Alexandre Neto
> ---------------------
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