samantha_wang的专栏

D3's axes are actually functions whose parameters you define.  when an axis function is called, it doesn't return a value like scale, but generate the visual elements of the axis, including lines

The area of the canvas your document intends to use is called the viewport. lines <line x1="start-x" y1="start-y" x2="end-x" y2="end-y" /> attribute stroke-width

1. attr() vs. style() attr() sets DOM attribute values, while style() applies CSS styles directly to an element.  2. Recommend using classes for properties that are shared by mulitiple elements,

1. D3 facilitates generation and manipulation of web documents with data. It does this by 1) Loading Data in to the browser's memory 2) Binding data to elements within the document, creating

点击打开链接 关于GeoJason很好的介绍文章 Let's look at GeoJSON in a little more depth, from the ground up. Understanding these concepts will help you understand geospatial data in general, too: the

1. event listener: on ("event_name", behavior); commonly, you will want to bind event listeners to more than one element at a time, such as to all of the visual elements in your visualization. Fo

Dynamic Data 1. Ordinal Scales var xScale = d3.scale.ordinal()                     // used for ordinal data, typically categories with some inherent order to them .domain(d3.range(dataset

By Jerome Cukier 点击打开链接 Scales: the main idea scales transform a number in a certain interval( called domain) into a number in another interval( called range) For instanc

点击打开链接 map school What is a map? Until the 1980s, maps were painstaking documents created by hand. These days maps are almost always made with the help of a computer. Maps today are co

1. How Selection works by Mike Bostock note:this is a great work by Mike. Look carefully and assimilate it. 点击打开链接 2. Two Tables Understanding D3 selections

Scales are functions that map from an input domain to an output range 1. quantitative scales : continuous domain     ordinal scales: discrete domain, such as a set of names or categories

点击打开链接  February 5, 2012Mike Bostock Thinking with Joins Say you’re making a basic scatterplot using D3, and you need to create some SVG circle elements to visualize your data. You