Marisa Tania

@mt-cs·5 public vizzes

D3: Drawing Scale

This example demonstrates how D3’s linear and square-root scales translate raw data coordinates into pixel positions and circle radii. It plots an array of 11 `[x, y]` pairs as circles and red text labels on an SVG canvas. The code uses `d3.scaleLinear()` for both the x and y axes, and `d3.scaleSqrt()` for sizing the circles proportionally. The scales are configured with custom domains and output ranges, with padding applied to keep marks inside the 500×300 viewport. Data is rendered statically, with labels showing the original coordinate values.

Sep 26, 2022

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D3: Drawing a Scatter Plot

This example displays a basic scatter plot of ten data points, each represented by a circle and a red text label showing its coordinates. The visualization uses D3.js v7 to append SVG circles and text elements to the document body. Circle radii are calculated as the square root of the difference between the plot height and the y-coordinate, creating a size variation tied to vertical position. The chart is drawn with a 500 by 100 pixel viewport, using the data array directly as the source for positioning.

Sep 26, 2022

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D3: Drawing a Bar Chart

This example demonstrates a basic bar chart built with D3 v7 in an SVG container, visualizing an array of 20 numeric values. The bars grow downward from the top of a 500×100 pixel canvas, with each bar’s height proportional to its data value multiplied by 4, and its fill color transitioning from dark to lighter blue based on the data. The chart also overlays each bar with white, 11px sans-serif text labels showing the exact data values, centered horizontally within each bar. The code uses `d3.select` to append SVG elements and the data-join pattern with `.enter()` to create rectangles and text nodes.

Sep 26, 2022

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D3: Drawing SVGs

This example demonstrates how to create basic SVG shapes with D3.js by rendering five circles of increasing radius. The code uses D3’s data join pattern, calling `selectAll`, `data`, `enter`, and `append` to bind an array of five numbers to circle elements. Each circle’s x-position is calculated from its index, its radius from the bound data value, and its fill, stroke, and stroke-width are set accordingly. The static SVG is 500 pixels wide and 50 pixels tall, with all circles vertically centered.

Sep 26, 2022

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D3: Drawing divs with data

This example shows 25 randomly generated data values rendered as a series of inline-block bars. The code uses D3.js v7’s `d3.select` and the data join pattern with `.data()`, `.enter()`, and `.append()` to create `div` elements styled with a CSS class. Each bar’s height is computed dynamically by multiplying the integer data value (0–29) by 5 pixels, overriding the default 75-pixel CSS height. The data is generated client-side with a JavaScript loop and `Math.random()`.

Sep 26, 2022