Comments (6)
The technique works with the current releases (d3-geo@1, d3-geo-projection@2 and d3-geo-polygon@1). The relevant call is
projection.preclip(d3.geoClipPolygon(ellipse));
where ellipse
is a GeoJSON polygon that goes βaroundβ the antipodes of the two centers a and b (in the rotation that puts them symmetrically around [0,0] on the equator):
const eps = 1e-3, u = (d3.geoDistance(a, b) / 2) * degrees + eps,
ellipse = {
type: "Polygon",
coordinates: [[
[180 - u, eps],
[180 - u, -eps],
[-180 + u, -eps],
[-180 + u, eps],
[180 - u, eps]
]]
};
from d3-geo-projection.
I have updated https://observablehq.com/@fil/two-point-equidistant with polygon clipping. The polygon in question is quite simple: it's just a rectangle that runs around the antipodes of the two centers. It covers 99.9996% of the globe ;)
from d3-geo-projection.
Not an answer to your question, but here's a modernized version, with a clip-angle of 145Β°:
https://observablehq.com/@fil/two-point-equidistant
from d3-geo-projection.
Oh and, if you want spherical ellipses, we got it covered too:
https://observablehq.com/@fil/spherical-ellipses
(turns out they're not needed for this projection since we want the "largest" ellipse we can get, and that's our simple polygon).
from d3-geo-projection.
Cool! I will have to wait for the next release, but how can I add this clipping polygon to my call?
return d3.geoTwoPointEquidistant([lon1, lat1],[lon2, lat2])
.clipAngle(105);
Thanks! ππ»
from d3-geo-projection.
Sweet! It works like a charm. Thank you for your help, @Fil! ππ»
from d3-geo-projection.
Related Issues (20)
- Relax d3-array dependency to 1-2. HOT 3
- compatibility of geoRectangularPolyconicRaw with geoInterrupt HOT 3
- There are es2015 in the final package file HOT 3
- Count Number Of Visible Objects Within Projection HOT 1
- What is the source of the projections? HOT 10
- Pangean projection HOT 5
- geoPath.curve ? HOT 1
- Support All US Territories in Albers USA projection HOT 7
- geoProject converts hole to MultiPolygon HOT 2
- Using this lib in TypeScript? HOT 2
- interrupted projections sometimes have partially undefined inverse HOT 2
- More customizable Wagner projections (and others)? HOT 7
- Add Cupola projection HOT 14
- A new quincuncial projection HOT 10
- geoStitch mislabels the union of two Polygons forming a hole on the date line as a MultiPolygon
- Could not find a declaration file HOT 2
- ISEA visualization? HOT 3
- No types definition package of d3-geo-projection HOT 1
- Renner's Hemispheric Projection HOT 13
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from d3-geo-projection.