glproj = `
float k = x * x + y * y + 2e-6;
lambda = x;
phi = 0.;
if (abs(y) > 1e-6) {
phi = y * .5;
for (int i = 0; i < 15; i++) {
float tanPhi = tan(phi),
secPhi = 1. / cos(phi),
j = k - (2. * y - phi) * phi;
phi -= (tanPhi * j + 2. * (phi - y)) / (2. + j * secPhi * secPhi + 2. * (phi - y) * tanPhi);
}
float tanPhi = tan(phi);
lambda = (abs(y) < abs(phi + 1. / tanPhi)
? asin(x * tanPhi)
: sign(y) * sign(x) * (acos(abs(x * tanPhi)) + halfPi)
) / sin(phi);
}
`
projection = d3
.geoPolyconic()
.fitExtent([[2, 2], [width - 2, height - 2]], { type: "Sphere" })
import { image } from "@fil/armadillo-glsl"
height = width * 0.8
import { reglCanvas, createDrawCommand, regl } with {
width,
height,
projection,
glproj,
image
} from "@fil/phytoplankton"
d3 = require("d3@7", "d3-geo-projection@3")
import { drag } from "@d3/versor-dragging"
import { slider } from "@jashkenas/inputs"
import { cos, radians } from "@fil/math"
land = d3.json(
"https://unpkg.com/visionscarto-world-atlas@0.0.6/world/110m_land.geojson"
)
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
