Published
Edited
Jun 30, 2020
Importers
9 stars
swatches({
colour: d3.scaleOrdinal(["<10", "10-19", "20-29", "30-39", "40-49", "50-59", "60-69", "70-79", "≥80"], d3.schemeSpectral[10])
})
swatches({
colour: d3.scaleOrdinal(["blueberries with redundant text", "oranges with redundant text", "apples with redundant text"], d3.schemeCategory10),
labelFormat: l => l.replace("with redundant text", "")
})
swatches({
colour: d3.scaleOrdinal(["One really big label", "And another"], ["gold", "slateblue"]),
swatchRadius: 20,
labelFont: "italic 40px serif"
})
function swatches({
colour,
swatchRadius = 6,
swatchPadding = swatchRadius * (2/3),
labelFont = "12px sans-serif",
labelFormat = x => x,
labelPadding = swatchRadius * 1.5,
marginLeft = 0
} = {}) {
const spacing = colour
.domain()
.map(d => labelFormat(d))
.map(d => getLabelLength(d, labelFont) + (swatchRadius * 2) + swatchPadding + labelPadding)
.map((_, i, g) => d3.cumsum(g)[i] + marginLeft)
const width = d3.max(spacing)
const height = swatchRadius * 2 + swatchPadding * 2
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.style("overflow", "visible")
.style("display", "block");
const g = svg
.append("g")
.attr("transform", `translate(0, ${height / 2})`)
.selectAll("g")
.data(colour.domain())
.join("g")
.attr("transform", (d, i) => `translate(${spacing[i - 1] || marginLeft}, 0)`);
g.append("circle")
.attr("fill", colour)
.attr("r", swatchRadius)
.attr("cx", swatchRadius)
.attr("cy", 0);
g.append("text")
.attr("x", swatchRadius * 2 + swatchPadding)
.attr("y", 0)
.attr("dominant-baseline", "central")
.style("font", labelFont)
.text(d => labelFormat(d));
return svg.node()
}
// adapted from https://observablehq.com/@mbostock/autosize-svg
getLabelLength = (label, labelFont = "12px sans-serif") => {
const id = DOM.uid("label").id;
const svg = html`<svg>
<style> .${id} { font: ${labelFont} } </style>
<g id=${id}>
<text class="${id}">${DOM.text(label)}</text>
</g>
</svg>`;
// Add the SVG element to the DOM so we can determine its size.
document.body.appendChild(svg);
// Compute the bounding box of the content.
const width = svg.getElementById(id).getBBox().width;
// Remove the SVG element from the DOM.
document.body.removeChild(svg);
return width;
}
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