Margin Convention

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Margin Convention

✓ Published0🌍 Public

Last edited Jun 11, 2015

Created on Oct 8, 2015

The example demonstrates the standard D3 margin convention for creating charts with axes, visually annotating the outer and inner dimensions and padding. It shows how the `margin` object and `padding` object define the chart’s layout, with the SVG’s root group translated by `margin.left` and `margin.top`. The code uses D3’s `d3.svg.axis()` for axes, `d3.scale.identity()` for scales, and SVG markers for arrowheads to label the origin and padding offsets. Arrows and text call out the translated origin and the spacing between the outer rectangle, inner plot area, and axes, clarifying the coordinate system for a simple linear scale.

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.

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