粗大的内捧猛烈进出看视频,japanese护士高潮,国产69成人精品视频免费

Performance optimization: Use selectAll(), data(), enter(), exit() reasonably to reduce DOM operations, and use requestAnimationFrame() to optimize animation performance.<\/p><\/li>\n<\/ul>\n\n\n \n\n \n "}

Home

Web Front-end

JS Tutorial

Ds in action: advanced data visualization techniques and examples

Linda Hamilton

Dec 30, 2024 am 07:11 AM

Ds in action: advanced data visualization techniques and examples

Basics

First, we need an HTML file to import the D3.js library and prepare a canvas to place our chart.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Getting Started with D3.js Example</title>
  <script src="https://d3js.org/d3.v7.min.js"></script>
</head>
<body>
  <svg width="500" height="500"></svg>
</body>
</html>

Create a simple line graph

// Assume we have the following data
var data = [4, 8, 15, 16, 23, 42];

// Create an SVG canvas
var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;

// Create x and y scales
var x = d3.scaleLinear()
    .domain(d3.extent(data, d => d))
    .range([0, width]);

var y = d3.scaleLinear()
    .domain([0, d3.max(data)])
    .range([height, 0]);

// Create the x and y axes
var xAxis = d3.axisBottom(x),
    yAxis = d3.axisLeft(y);

// Add axis
svg.append("g")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .call(yAxis);

// Draw the polyline
var line = d3.line()
    .x(d => x(d))
    .y(d => y(d));

svg.append("path")
    .datum(data)
    .attr("class", "line")
    .attr("d", line);

Creating a Bar Chart

// Suppose we have the following data
var data = [4, 8, 15, 16, 23, 42];

// Creating the SVG canvas and scale
var svg = d3.select("svg").attr("width", 500).attr("height", 500);
var margin = {top: 20, right: 20, bottom: 30, left: 40};
var width = +svg.attr("width") - margin.left - margin.right;
var height = +svg.attr("height") - margin.top - margin.bottom;
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1);
var y = d3.scaleLinear().rangeRound([height, 0]);

// Mapping data to scale
x.domain(data.map(function(d) { return d; }));
y.domain([0, d3.max(data)]);

// Creating an SVG g Element
var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Adding x and y axes
g.append("g")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x));

g.append("g")
    .call(d3.axisLeft(y));

// Draw a bar chart
g.selectAll(".bar")
    .data(data)
    .enter().append("rect")
    .attr("class", "bar")
    .attr("x", function(d) { return x(d); })
    .attr("y", function(d) { return y(d); })
    .attr("width", x.bandwidth())
    .attr("height", function(d) { return height - y(d); });

Create a pie chart

// Suppose we have the following data
var data = [4, 8, 15, 16, 23, 42];

// Creating the SVG canvas and scale
var svg = d3.select("svg").attr("width", 500).attr("height", 500);
var radius = Math.min(svg.attr("width"), svg.attr("height")) / 2;

// Creating an arc scale
var arc = d3.arc().outerRadius(radius).innerRadius(0);
var pie = d3.pie().value(function(d) { return d; });

// Draw a pie chart
var g = svg.append("g")
    .attr("transform", "translate(" + radius + "," + radius + ")");

var arcs = g.selectAll("arc")
    .data(pie(data))
    .enter().append("g")
    .attr("class", "arc");

arcs.append("path")
    .attr("d", arc)
    .attr("fill", function(d, i) { return d3.schemeCategory10[i]; });

arcs.append("text")
    .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
    .attr("dy", ".35em")
    .text(function(d) { return d.data; });

Interactivity and animation

Interactivity example: adding hover effects to a bar chart

// Assuming that the bar chart base code already exists
// ...

// Add hover effects
g.selectAll(".bar")
    .on("mouseover", function(event, d) {
        d3.select(this)
            .transition()
            .duration(200)
            .attr("fill", "orange"); // Mouseover color change

        // Show Data Tips
        var tooltip = g.append("text")
            .attr("class", "tooltip")
            .attr("x", x(d) + x.bandwidth() / 2)
            .attr("y", y(d) - 10)
            .text(d);
    })
    .on("mouseout", function(event, d) {
        d3.select(this)
            .transition()
            .duration(200)
            .attr("fill", "steelblue"); // Restore original color

        // Remove data tips
        g.selectAll(".tooltip").remove();
    });

Animation example: Smooth transition line chart data update

// Assume that there is already a line chart basic code
// ...

// Update data
var newData = [8, 15, 16, 23, 42, 45];

// Update scale domain
x.domain(d3.extent(newData));
y.domain([0, d3.max(newData)]);

// Update axis
g.select(".axis--x").transition().duration(750).call(xAxis);
g.select(".axis--y").transition().duration(750).call(yAxis);

// Update path
var path = g.select(".line");
path.datum(newData).transition().duration(750).attr("d", line);

Complex graphs: force-directed graphs

Force-directed graphs show the relationship between nodes and edges, which is very suitable for visualizing data such as networks and social graphs.

// Assume we have data on nodes and edges
var nodes = [{id: "A"}, {id: "B"}, {id: "C"}];
var links = [{source: nodes[0], target: nodes[1]}, {source: nodes[1], target: nodes[2]}];

// Creating the SVG Canvas
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

// Creating a Force Simulation
var simulation = d3.forceSimulation(nodes)
    .force("link", d3.forceLink(links).id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));

// Creating links and nodes
var link = svg.append("g")
    .attr("stroke", "#999")
    .attr("stroke-opacity", 0.6)
  .selectAll("line")
  .data(links)
  .join("line")
    .attr("stroke-width", 2);

var node = svg.append("g")
    .attr("stroke", "#fff")
    .attr("stroke-width", 1.5)
  .selectAll("circle")
  .data(nodes)
  .join("circle")
    .attr("r", 5)
    .call(d3.drag()
        .on("start", dragstarted)
        .on("drag", dragged)
        .on("end", dragended));

node.append("title")
    .text(function(d) { return d.id; });

simulation.on("tick", ticked);

function ticked() {
  link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });

  node
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

// Drag event handling function
function dragstarted(event, d) {
  if (!event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

function dragged(event, d) {
  d.fx = event.x;
  d.fy = event.y;
}

function dragended(event, d) {
  if (!event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}

Map Visualization

D3.js can work with geographic data formats such as GeoJSON to create interactive maps. This includes countries, states, city boundaries, etc.

Basic steps:

Load map data: Use D3's d3.json or d3.geoJson to load GeoJSON data.
Create scale: Define a geographic projection and scale, such as Mercator or Albers USA.
Bind data and draw: Bind GeoJSON data to SVG path elements and apply a projection.
Add interactions: Such as hover effects, click events, etc.

d3.json("world.geojson").then(function(geoData) {
  var svg = d3.select("svg"),
      projection = d3.geoMercator().scale(130).translate([400, 250]),
      path = d3.geoPath().projection(projection);

  svg.selectAll("path")
    .data(geoData.features)
    .enter().append("path")
    .attr("d", path)
    .attr("fill", "#ccc")
    .attr("stroke", "#fff");
});

Data binding and dynamic update

Basic steps:

Initialize data binding: Use the data() method to bind data to DOM elements.
Enter, Update, Exit mode: process new data, update existing data, and remove useless data.
Dynamic update: monitor data changes, re-execute binding and rendering processes.

var svg = d3.select("svg"),
    data = [4, 8, 15, 16, 23, 42];

// Initialize the bar chart
var bars = svg.selectAll("rect").data(data);

bars.enter().append("rect")
    .attr("x", function(d, i) { return i * 50; })
    .attr("y", function(d) { return 300 - d; })
    .attr("width", 40)
    .attr("height", function(d) { return d; });

// Dynamic Updates
setInterval(function() {
  data = data.map(function(d) { return Math.max(0, Math.random() * 50); });

  bars.data(data)
    .transition()
    .duration(500)
    .attr("y", function(d) { return 300 - d; })
    .attr("height", function(d) { return d; });
}, 2000);

Complex charts and advanced techniques

Advanced techniques:

Use D3 component libraries: Libraries like D3fc provide advanced chart components to simplify the creation of complex charts.
Animation and transition: Use the transition() method to create smooth animation effects.
Interactivity: Add click and hover events, and use brush and zoom functions to enhance user experience.
Performance optimization: Use selectAll(), data(), enter(), exit() reasonably to reduce DOM operations, and use requestAnimationFrame() to optimize animation performance.

The above is the detailed content of Ds in action: advanced data visualization techniques and examples. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress images for free

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Guide: Stellar Blade Save File Location/Save File Lost/Not Saving

4 weeks ago By DDD

Oguri Cap Build Guide | A Pretty Derby Musume

2 weeks ago By Jack chen

Agnes Tachyon Build Guide | A Pretty Derby Musume

1 weeks ago By Jack chen

Dune: Awakening - Advanced Planetologist Quest Walkthrough

3 weeks ago By Jack chen

Date Everything: Dirk And Harper Relationship Guide

4 weeks ago By Jack chen

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

8637

Java Tutorial

1783

CakePHP Tutorial

1727

Laravel Tutorial

1577

PHP Tutorial

1442

Related knowledge

Java vs. JavaScript: Clearing Up the Confusion Jun 20, 2025 am 12:27 AM

Java and JavaScript are different programming languages, each suitable for different application scenarios. Java is used for large enterprise and mobile application development, while JavaScript is mainly used for web page development.

Javascript Comments: short explanation Jun 19, 2025 am 12:40 AM

JavaScriptcommentsareessentialformaintaining,reading,andguidingcodeexecution.1)Single-linecommentsareusedforquickexplanations.2)Multi-linecommentsexplaincomplexlogicorprovidedetaileddocumentation.3)Inlinecommentsclarifyspecificpartsofcode.Bestpractic

How to work with dates and times in js? Jul 01, 2025 am 01:27 AM

The following points should be noted when processing dates and time in JavaScript: 1. There are many ways to create Date objects. It is recommended to use ISO format strings to ensure compatibility; 2. Get and set time information can be obtained and set methods, and note that the month starts from 0; 3. Manually formatting dates requires strings, and third-party libraries can also be used; 4. It is recommended to use libraries that support time zones, such as Luxon. Mastering these key points can effectively avoid common mistakes.

Why should you place tags at the bottom of the ? Jul 02, 2025 am 01:22 AM

PlacingtagsatthebottomofablogpostorwebpageservespracticalpurposesforSEO,userexperience,anddesign.1.IthelpswithSEObyallowingsearchenginestoaccesskeyword-relevanttagswithoutclutteringthemaincontent.2.Itimprovesuserexperiencebykeepingthefocusonthearticl

JavaScript vs. Java: A Comprehensive Comparison for Developers Jun 20, 2025 am 12:21 AM

JavaScriptispreferredforwebdevelopment,whileJavaisbetterforlarge-scalebackendsystemsandAndroidapps.1)JavaScriptexcelsincreatinginteractivewebexperienceswithitsdynamicnatureandDOMmanipulation.2)Javaoffersstrongtypingandobject-orientedfeatures,idealfor

JavaScript: Exploring Data Types for Efficient Coding Jun 20, 2025 am 12:46 AM

JavaScripthassevenfundamentaldatatypes:number,string,boolean,undefined,null,object,andsymbol.1)Numbersuseadouble-precisionformat,usefulforwidevaluerangesbutbecautiouswithfloating-pointarithmetic.2)Stringsareimmutable,useefficientconcatenationmethodsf

What is event bubbling and capturing in the DOM? Jul 02, 2025 am 01:19 AM

Event capture and bubble are two stages of event propagation in DOM. Capture is from the top layer to the target element, and bubble is from the target element to the top layer. 1. Event capture is implemented by setting the useCapture parameter of addEventListener to true; 2. Event bubble is the default behavior, useCapture is set to false or omitted; 3. Event propagation can be used to prevent event propagation; 4. Event bubbling supports event delegation to improve dynamic content processing efficiency; 5. Capture can be used to intercept events in advance, such as logging or error processing. Understanding these two phases helps to accurately control the timing and how JavaScript responds to user operations.

What's the Difference Between Java and JavaScript? Jun 17, 2025 am 09:17 AM

Java and JavaScript are different programming languages. 1.Java is a statically typed and compiled language, suitable for enterprise applications and large systems. 2. JavaScript is a dynamic type and interpreted language, mainly used for web interaction and front-end development.

See all articles

国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Ds in action: advanced data visualization techniques and examples

Basics

Create a simple line graph

Creating a Bar Chart

Create a pie chart

Interactivity and animation

Complex graphs: force-directed graphs

Map Visualization

Data binding and dynamic update

Complex charts and advanced techniques

Hot AI Tools

Undress AI Tool

Undresser.AI Undress

AI Clothes Remover

Clothoff.io

Video Face Swap

Hot Article

Hot Tools

Notepad++7.3.1

SublimeText3 Chinese version

Zend Studio 13.0.1

Dreamweaver CS6

SublimeText3 Mac version

Hot Topics