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Plot.plot({
aspectRatio: 1,
color: { legend: true, label: "Elevation (m)" },
x: { domain: [0, volcano.width] },
y: { domain: [0, volcano.height] },
clip: true,
marks: [
pad
? Plot.contour(pvolcano.values, {
x1: -1,
y1: -1,
x2: pvolcano.width - 1,
y2: pvolcano.height - 1,
width: pvolcano.width,
height: pvolcano.height,
fill: Plot.identity,
stroke: "black"
})
: Plot.contour(volcano.values, {
width: volcano.width,
height: volcano.height,
fill: Plot.identity,
stroke: "black"
})
]
})
function padof({width, height, values}) {
return {
width: width + 2,
height: height + 2,
values: Array.from({length: (width + 2) * (height + 2)}, (_, i) => {
const x = Math.max(0, Math.min(width - 1, i % (width + 2) - 1));
const y = Math.max(0, Math.min(height - 1, Math.floor(i / (width + 2)) - 1));
return values[y * width + x];
})
};
}
volcano = await FileAttachment("volcano.json").json()
pvolcano = padof(volcano)
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