Treemap Activity (complete) / Interactive Info Vis

UW iSchool Course INFO 474: focused on designing and building visualizations to better understand and communicate about pressing issues.

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Feb 1, 2021

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render_data_table(data)

// Group by region

grouped = d3.group(data, d => d.region)

hierarchy2 = d3.hierarchy(grouped)

// Transform into a hierarchy (but don't yet specify the sum() function)

hierarchy = d3.hierarchy(grouped)

// Write a function that can compute treemap layout

make_treemap_layout = d3

.treemap()

.round(true)

.tile(d3.treemapResquarify)

.size([width, height])

// Make a color scale, setting the regions as the colors

color = d3

.scaleOrdinal()

.domain([...grouped.keys()])

.range(d3.schemeCategory10)

make_treemap_layout(hierarchy2)

// Draw the visualization

basic_chart = {

make_treemap_layout(hierarchy.sum(d => d.life_expectancy));

const svg = d3

.create("svg")

.attr("width", width)

.attr("height", height);

svg

.selectAll("rect")

.data(hierarchy.leaves())

.join("rect")

.attr("x", d => d.x0)

.attr("width", d => d.x1 - d.x0)

.attr("y", d => d.y0)

.attr("height", d => d.y1 - d.y0)

.style("stroke", "white")

.style("fill", d => color(d.parent.data[0]))

return svg.node();

}

// Draw the visualization

chart = {

// Create or select the svg

let svg;

if (!this) {

svg = d3

.create("svg")

.attr("width", width)

.attr("height", height);

} else {

svg = d3.select(this);

}

// Compute the layout with the selected metric

make_treemap_layout(hierarchy.sum(d => d[metric]));

// Perform a data join on the `g` elements (that contain the rectangles and their labels)

svg

.selectAll("g")

.data(hierarchy.leaves())

.join(enter => {

// For entering elements, append the text and rectangle, position in the middle of the svg

const gs = enter

.append("g")

.attr("transform", d => `translate(${width / 2}, ${height / 2})`);

gs.append("text")

.text(d => d.data.country_code)

.style("font-size", "10px")

.attr("y", 10);

gs.append("rect")

.style("stroke", "white")

.style("fill", d => color(d.data.region))

.style("fill-opacity", .5);

return gs;

})

// transition the position of the g elements

.transition()

.ease(d3.easeBounceOut) //uncomment for a bouncing transition

.duration(1500)

.delay((d, i) => i * 20)

.attr("transform", d => `translate(${d.x0}, ${d.y0})`)

// and transition the size of the rectangles inside of them

.selectAll("rect")

.attr("width", d => d.x1 - d.x0)

.attr("height", d => d.y1 - d.y0);

return svg.node();

}

appendix = md`## Appendix`

_ = require("lodash")

d3 = require("d3")

import { select } from "@jashkenas/inputs"

height = 500

import {

render_data_table,

group_notebook_instructions,

table_styles

} from "@uw-info474/utilities"

table_styles

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