We currently determine the default height for whole-world projections automatically (for named projections):
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// When a named projection is specified, we can use its natural aspect ratio to |
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// determine a good value for the projection’s height based on the desired |
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// width. When we don’t have a way to know, the golden ratio is our best guess. |
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// Due to a circular dependency (we need to know the height before we can |
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// construct the projection), we have to test the raw projection option rather |
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// than the materialized projection; therefore we must be extremely careful that |
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// the logic of this function exactly matches createProjection above! |
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export function projectionAspectRatio(projection) { |
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if (typeof projection?.stream === "function") return defaultAspectRatio; |
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if (isObject(projection)) projection = projection.type; |
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if (projection == null) return; |
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if (typeof projection !== "function") { |
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const {aspectRatio} = namedProjection(projection); |
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if (aspectRatio) return aspectRatio; |
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} |
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return defaultAspectRatio; |
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} |
It’d be nice to do that if the domain is specified, too. For example:
Plot.plot({
projection: {
type: "conic-conformal",
parallels: [34.3333, 36.1667],
rotate: [79, 0],
domain: ncstate
},
marks: [
Plot.geo(ncstate),
Plot.geo(nccounties, {strokeOpacity: 0.1})
]
})