Andreas Loew

@CodeAndWeb·7 public vizzes

Choropleth Map with Interactive Filtering

A choropleth map of world countries, colored by ordinal income group, includes a color legend that filters the map when clicked. Clicking a legend label dims all countries except those in that group; clicking the same label again clears the filter. The map uses the `geoNaturalEarth1` projection with SVG paths generated by `geoPath`, and the legend re-renders via an `onClick` handler. Data is loaded from a world-atlas TopoJSON and TSV files.

Dec 8, 2019

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Choropleth Map

This choropleth map visualizes the world's countries, colored according to their economic classification. The map uses D3's `geoNaturalEarth1` projection and `geoPath` to render the geographic shapes, with an ordinal color scale based on a spectral scheme to represent the data. Country data comes from the world-atlas dataset, which merges TopoJSON geometry with TSV metadata. Interactive features include zooming via `zoom()` and a color legend built with `scaleOrdinal` and SVG elements. Hovering over a country highlights it in red and displays a tooltip with its name and economic group.

Dec 8, 2019

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Color and Size Legends

This example demonstrates two custom legend components built with D3 v5 and rendered as SVG. A color legend uses `scaleOrdinal` to map fruit categories to distinct circle fills, while a size legend employs `scaleSqrt` with `ticks()` to encode numeric values as varying circle radii. Both legends bind data to grouped `<g>` elements, applying enter/merge/exit selections for dynamic updates. The code defines reusable functions `colorLegend` and `sizeLegend`, called via `.call()`, with text labels positioned using `textOffset`.

Dec 8, 2019

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Blank Canvas

A blank SVG canvas fills the browser viewport, displaying nothing but a single rounded rectangle that matches the window's dimensions. The visualization demonstrates the foundational setup of a D3 project by importing the `d3` library and appending a basic shape element. Using `d3.select` on an empty SVG, it dynamically sets the width and height attributes based on the document's client dimensions, then adds a `rect` with a 40-pixel corner radius. The code relies on D3 v5 and a bundled JavaScript file, with CSS positioning the body to cover the entire viewport.

Dec 8, 2019

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Blank Canvas

A blank, rounded rectangle fills the entire browser viewport, offering an empty visual canvas. The example demonstrates the minimal setup for a D3.js v5 visualization using SVG rendering, where the page dimensions are read directly from the document body and applied to the SVG element. The code relies on d3.select to target the pre-existing svg tag and appends a single rect with corner radius. No data drives the display; the focus is purely on establishing a flexible, full-window drawing surface.

Dec 8, 2019

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Blank Canvas

A blank SVG canvas fills the browser window with a single rounded rectangle. The visualization demonstrates minimal setup using D3 v5, where the `select` method targets the SVG element and sets its dimensions to match the viewport. A rect with a 40-pixel corner radius is appended to create the sole visual element. The example relies on the document body's client dimensions to size the canvas, with CSS constraining the page layout to prevent scrolling.

Dec 8, 2019

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World

A world map rendered with D3 shows countries in light green on a light blue sphere, with black borders highlighting national boundaries. The visualization uses the Natural Earth projection via `geoNaturalEarth1` and draws the sphere and country paths with `geoPath`. Country data comes from the World Atlas TopoJSON dataset, loaded through `json` and converted with `feature`. Users can pan and zoom the map using D3’s `zoom` behavior, while hovering over a country turns it darker green, revealing its name in a tooltip.

Dec 7, 2019