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); } ) . attr ("Y", function (d,i) {return + 500-yscale (d); }) . attr ("width", function (d,i) {return Xscale.rangeband (); }) . attr ("height", yscale). attr ("Fill", "Red") . On ("click", Function (d,i) {d3.select (this). attr ("Fill "," green "); }) . On ("MouseOver", function (d,i) {d3.select (this) . attr ("Fill", "yellow"); }) . On ("Mouseout", function (d,i) {

What is the problem of word-wrapping? An existing string: Li Qingzhao's cut plum, have you read it? body Add an svg element to the size as follows: var width =; var height =; var svg = d3.select ("Body") . Append ("SVG") . attr ("width", width) Then add the text, with the text elements, such code we are very familiar with: var text = svg.append ("text"). attr ("x"). attr ("Y", m). attr ("

for each region: DX and dy. Used to save offsets.2. Definition of the Drag eventEach time the drag event is triggered, we just need to get the mouse offset and add it to the original offset dx and dy.Then use D3.select (this) to select the current element and apply the transform to it to complete the panning operation.var drag = D3.behavior.drag (). Origin (function (d) {return D;}). On ("Drag", DragMove),

Most of the data bound in D3 is done by the function, how does it work, and how does it differ from datum ()?The data () function can bind array items to each element individually, and can set rules for binding. Data () can also handle cases where the length of the array is inconsistent with the number of elements. When the array length is greater than the number of elements, the element position can be reserved for extra data so that new elements can

Force map finishing on D3 official websiteIts code:/** @Author: Administrator * @Date: 2015-11-18 15:45:55 * @Last Modified by:administrator * @Last Modified time: 2015-11-27 11:49:48*/' Use strict ';varForcetree =function(setting) {D3.select (setting.selector). SelectAll (' SVG '). Remove ()varselector =Setting.selector, Tempseries=setting.series, Series=Setting.series, W= Document.queryselector (selector)

In the previous chapter, we used a very important concept-scale, which explains how to use this section.1. Maximum value and minimum valueBefore introducing the scale, we introduce two functions that appear together with the scale bar, and also appear in the "3rd chapter". D3.max () D3.min () These two functions are used to find the maximum and minimum values in an array, and if it is a on

In general, there is not much text in the chart. However, sometimes you need some text to describe some graphical elements. Then, you can implement an interaction: when the user mouse slides to a graphic element, a prompt box appears with descriptive text. This is a simple, universal interaction that works on almost all charts. By customizing the appearance to the cue box, you can give the user a good experience.1. How to make a prompt boxThe Prompt box is "text" Plus "border". display text, gen

and introduced in the tag: To realize data visualization with D3, you first need to define the data. We will use JSON-formatted data. Of course, you can use other types of data. var data = {"East": [{"Ordernum": 12} , {"Ordernum": 20} , {"Ordernum": 30} , {"Ordernum": 40} , {"Ordernum": 40} ]}; The Select command in D3, the primary feature is the selection of elements to be manipulated by the data.

D3 is a visual JS library based on data manipulation, and the understanding of D3 can be discussed from the most basic display of loadable data. The basic framework of HTML is not much said, the first code to explain: Create a new test directory under which the demo and D3 two folders are created. Demo to store the HTML file to write,

Getting Started Good article: http://www.ourd3js.com/wordpress/?p=51D3.js and D3.min.js content, the latter is compressed, suitable for release, the former suitable for developers.1. Selection set (meets CSS selector requirements) primarily used with data bindingD3.select ()D3.selectall ()var BODY = D3.select ("Body")2. Data binding (essentially adding a variable

Figure 1. Column Chart1. Column ChartExamples of the previous chapters are the processing of words. This chapter will use D3 to make a simple column chart. There are many ways to make a column chart, such as using HTML SVG, you can scale vector graphics (Scalable vector graphic), using XML format to define the graphics, you can learn the relevant syntax of SVG in W3school, do not need to remember all the tags, use the time to check again.Let's look at

},{"name": "Lishui", "GDP": 983}]}, * * omit partial data ***************]}Each leaf node contains name and gdp,name are node names, and GDP is the node size. The omitted part of the data also contains the cities of Guangxi and Jiangsu provinces.2. Layout (data conversion)Create a matrix tree layout with dimensions set to [width, height], which is the size of the SVG canvas, the value accessor is set to GDP, and the code is as follows:var treemap = D3