Margin Convention

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Margin Convention

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Last edited Jun 20, 2018

Created on Jun 20, 2018

This example illustrates the margin convention for D3 v3 layouts, showing how to separate the outer SVG canvas from the inner chart area. It defines `width` and `height` as inner dimensions, subtracting margin and padding objects, then applies these as a translation to a G element. Rectangles outline the outer and inner regions, while axes are positioned using `d3.svg.axis` at the bottom and right edges. Arrows and labels mark the origin and translate offsets. The code uses SVG rendering with `d3.scale.identity` for mapping coordinates.

AI-generated description

First define the margin object with properties for the four sides (clockwise from the top, as in CSS).

var margin = {top: 20, right: 10, bottom: 20, left: 10};

Then define width and height as the inner dimensions of the chart area.

var width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

Lastly, define svg as a G element that translates the origin to the top-left corner of the chart area.

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

With this convention, all subsequent code can ignore margins. For example, to create x and y scales, simply say:

var x = d3.scale.linear()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

If you want to add axes to the chart, they will be positioned correctly by default in the "left" and "top" orientations. For "right" or "bottom" orientation, translate the axis G element by the width or height, respectively.

forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/3019563'>Margin Convention</a>

gpl-3.0 Licensed

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