Hi. I'm Nicolas Lambert, research engineer in geographic information science at CNRS (France). My job is to draw maps and teach cartography at the university. I am a geographer 🌎, and not really a developer 🖥️
Map projectionsh3-jsSymbolsThe draw() functionsquareProportional symbolsTypologyChoroplethLayout marksHandle geometriesSVG filters and clipTile markContainersinsetsPath markText markInteractivityTooltipsLegendsCircle markRidgelines mapWhy it's better not to add scalebars to world mapsNight and dayPan and zoomCharging points for electric vehicles in ParisLet's design a "dot cartogram"Hello geovizWorld Population
Spike mark
viz.spike({
height: 100,
width: 40,
fill: "#38896F",
stroke: "#38896F"
})
viz.plot({
type: "spike",
height: 100,
width: 40,
fill: "#38896F",
stroke: "#38896F"
})
The <mark>straight</mark> attribute allow to customize the curve (0 = curved ; 1 = straight).
viewof straight = Inputs.range([0, 1], { label: "straight", step: 0.05 })
viz.spike({
height: 100,
width: 40,
fill: "#38896F",
stroke: "#38896F",
straight
})
position = [300, 100]
{
// Container
let svg = viz.create({
width: 500,
domain: world,
zoomable: true
});
// Basemap
svg.path({ datum: world, fill: "#CCC" });
// Spike
svg.spike({
pos: position,
fill: "#38896F",
stroke: "#38896F"
});
// Render
return svg.render();
}
{
// Container
let svg = viz.create({
width: 500,
domain: world,
zoomable: true
});
// Basemap
svg.path({ datum: world, fill: "#CCC" });
// Spike
svg.spike({
coords: "geo",
pos: mumbai,
fill: "#38896F",
stroke: "#38896F"
});
// Render
return svg.render();
}
{
// Container
let svg = viz.create({
width: 500,
zoomable: true,
domain: world
});
// Basemap
svg.path({ datum: world, fill: "#CCC" });
// Spikes
svg.spike({
data: world,
width: 10,
stroke: "#38896F",
straight: 0.5,
height: 10,
fill: "#38896F"
});
// Render
return svg.render();
}
{
// Container
let svg = viz.create({
width: 1000,
zoomable: true,
domain: world
});
// Basemap
svg.path({ datum: world, fill: "#CCC" });
// Spikes
svg.spike({
data: world,
width: 10,
k,
fillOpacity: 1,
stroke: "#38896F",
straight: 0.5,
height: "pop",
fill: "#38896F",
tip: true
});
// Render
return svg.render();
}
4 - Legends
viz.legend.spikes({ spike_stroke: "#38896F", title: "Number of inhabitants" })
viz.legend.spikes({
data: world.features.map((d) => d.properties.pop),
values_round: 0,
spike_stroke: "#38896F"
})
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