A parallel coordinates chart is a type of chart that is well suited for visualizing many data dimensions at the same type. This is unlike most classical chart types, which are only able to represent data along two coordinate axis, with possibly additional dimensions mapping to size and color of the plotted primitives.

To show an arbitrary number of dimensions, the parallel lines chart establishes one parallel axis per dimension, and lets a data-point be represented as a line passing through each axis at its corresponding value.

In addition to the classical parallel coordinates chart, this plugin also synchronizes a strip of minified scatterplots between each consecutive pair of axis, which is helpful to provide a more traditional reference for the represented data.

Figure 1. A parallel lines chart

A parallel lines chart

Interaction with the Parallel Lines Chart

Hovering the mouse pointer over the chart highlights the nearest line or bucket of the dataset, displaying the associated values for each axis and the number of documents associated with the line.

Filtering Lines

Clicking and dragging on columns enables you to define a filter for the values of a column. This means that all values outside the defined range are dimmed and unselectable. It is also possible to click a single value of a column, thus placing a filter on the single value itself, instead of a range of values.

Filters can also be defined on the minified scatterplots by clicking and dragging to a rectangle shape. This places two range filters on the axis columns.

Figure 2. A range filter and a value filter