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首页OpenLayers 3 初学者指南：开始使用动态地图开发

OpenLayers 3 初学者指南：开始使用动态地图开发

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OpenLayers 3 Beginner's Guide OpenLayers 3 是一个基于 JavaScript 的开源地图库，用于创建交互式的 web 地图应用程序。该库提供了强大的功能，包括支持多种地图数据格式、可扩展的插件架构、丰富的 API 和灵活的样式化选项。本指南旨在帮助初学者快速入门 OpenLayers 3，并学习如何使用该库创建动态的 web 地图应用程序。通过本指南，读者将学习如何安装和配置 OpenLayers 3，如何创建和显示地图，如何使用控件和工具栏，如何处理地图事件，以及如何自定义地图样式。 OpenLayers 3 的优点包括： * 开源免费：OpenLayers 3 是一个开源的库，免费供开发者使用。 * 跨浏览器兼容：OpenLayers 3 可以在多种浏览器上运行，无需担心浏览器的兼容性问题。 * 强大的插件架构：OpenLayers 3 提供了丰富的插件架构，允许开发者轻松地扩展和定制地图应用程序。 * 丰富的 API：OpenLayers 3 提供了详细的 API 文档和示例代码，帮助开发者快速上手。在本指南中，我们将深入探讨 OpenLayers 3 的各个方面，包括如何创建基本的地图，如何使用控件和工具栏，如何处理地图事件，如何自定义地图样式，以及如何使用 OpenLayers 3 创建复杂的 GIS 应用程序。本指南适合以下读者： * GIS 开发者：OpenLayers 3 是一个功能强大且灵活的地图库，非常适合 GIS 开发者的需求。 * Web 开发者：OpenLayers 3 提供了丰富的 API 和插件架构，非常适合 Web 开发者的需求。 * 地图爱好者：OpenLayers 3 提供了丰富的示例代码和文档，非常适合地图爱好者学习和实践。本指南旨在帮助读者快速入门 OpenLayers 3，并学习如何使用该库创建动态的 web 地图应用程序。

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Table of Contents

[ vii ]

Time for acon – using ol.interacon.Modify to update drawing 278

Understanding interacons and their architecture 280

The short story of interacons 280

Inspecng the ol.interacon.defaults funcon 281

Time for acon – conguring default interacons 282

A funconal view for the nine default interacons 283

Discovering the other interacons 284

Time for acon – using ol.interacon.DragRotateAndZoom 284

Time for acon – making a rectangle export to GeoJSON with

ol.interacon.DragBox 286

Summary 289

Chapter 9: Taking Control of Controls 291

Introducing controls 292

Using controls in OpenLayers 292

Adding controls to your map 292

Time for acon – starng with the default controls 293

Controls overview 296

The ol.control.Control class 297

Control opons 297

The ol.control.Aribuon control 297

Aribuon opons 297

Time for acon – changing the default aribuon styles 298

The ol.control.Zoom control 300

Zoom opons 300

The ol.control.Rotate control 301

Rotate opons 302

The ol.control.FullScreen control 302

FullScreen opons 303

The ol.control.MousePosion control 303

MousePosion opons 303

Time for acon – nding your mouse posion 304

The ol.control.ScaleLine control 306

ScaleLine opons 306

The ol.control.ZoomSlider control 308

ZoomSlider opons 308

The ol.control.ZoomToExtent control 309

Time for acon – conguring ZoomToExtent and manipulate controls 309

Creang a custom control 311

Time for acon – extending ol.control.Control to make your own control 312

Summary 315

Table of Contents

[ viii ]

Chapter 10: OpenLayers Goes Mobile 317

Touch support in OpenLayers 318

Using a web server 318

Finding your IP address on Windows 318

Finding your IP address on OSX 319

Finding your IP address on Linux 320

Tesng your IP address 321

Time for acon – go mobile! 321

The Geolocaon class 324

Limitaons of the Geolocaon class 325

Using the Geolocaon class 325

Time for acon – locaon, locaon, locaon 325

The Geolocaon class in detail 327

Geolocaon constructor opons 328

Geolocaon KVO properes 328

The DeviceOrientaon class 329

Time for acon – a sense of direcon 331

DeviceOrientaon constructor opons 332

DeviceOrientaon KVO property methods 333

Debugging mobile web applicaons 333

Debugging on iOS 333

Debugging on Android 336

Debug anywhere – WEb INspector REmote (WEINRE) 340

Geng started with WEINRE 341

Going oine 346

The HTML 5 ApplicaonCache interface 346

Creang an ApplicaonCache MANIFEST le 347

Referencing a MANIFEST le in a web page 348

Time for acon – MANIFEST desny 349

Going nave with web applicaons 351

Time for acon – track me 352

Summary 354

Chapter 11: Creang Web Map Apps 355

Development strategies 355

Using geospaal data from Flickr 356

Note on APIs 356

Accessing the Flickr public data feeds 356

How we'll do it 357

Time for acon – geng Flickr data 357

A simple applicaon 359

Time for Acon – adding data to your map 359

Styling the features 361

Table of Contents

[ ix ]

Time for acon – creang a style funcon 361

Creang a thumbnail style 362

Switch to JSON 363

Time for acon – switching to JSON data 363

Time for acon – creang a thumbnail style 366

Turning our example into an applicaon 367

Adding interacvity 367

Time for acon – adding the select interacon 368

Time for acon – handling selecon events 370

Displaying photo informaon 371

Time for acon – displaying photo informaon 372

Using real me data 375

Time for acon – geng dynamic data 375

Wrapping up the applicaon 376

The plan 377

Changing the URL 377

Time for acon – adding dynamic tags to your map 377

Deploying an applicaon 379

Creang custom builds 379

Benets of serving small les 380

Two approaches to opmizaon 380

What does the compiler do? 381

Rewring code 382

Removing unused code 382

Renaming objects, funcons, and properes 383

Creang a combined build 384

Time for acon – creang a combined build 384

Creang a separate build 388

Time for acon – creang a separate build 389

Summary 392

Appendix A: Object-oriented Programming – Introducon and Concepts 393

What is object-oriented programming? 394

What is an object? 394

What is a class? 394

What is a constructor? 395

What is inheritance? 395

What is an abstract class? 396

What is a namespace? 397

What are geers and seers? 397

Going further 400

Table of Contents

[ x ]

Appendix B: More details on Closure Tools and Code Opmizaon

Techniques 401

The Closure Tools philosophy 402

Ensuring opmum performance 402

Introducing Closure Library, yet another JavaScript library 404

The basics 404

Time for acon – rst steps with Closure Library 404

Custom components 409

Inheritance, dependencies, and annotaons 409

Making custom build for opmizing performance 414

Time for acon – playing with Closure Compiler 414

Applying your knowledge to the OpenLayers case 417

Installing the OpenLayers development environment 417

Installing Node.js 418

Installing Java 419

Installing Git 420

Microso Windows 420

Local OpenLayers development reloaded 421

Time for acon - running ocial examples with the internal

OpenLayers toolkit 421

Time for acon - building your custom OpenLayers library 424

Syntax and styles 431

Time for acon – using Closure Linter to x JavaScript 431

Coding styles alternaves and tools 433

Summary 434

Appendix C: Squashing Bugs with Web Debuggers 435

Introducing Chrome Developer Tools 436

Geng started with Chrome Developer Tools 436

Time for acon – opening Chrome Developer Tools 437

Explaining Chrome Developer debugging controls 439

Panels 440

Time for acon – using DOM manipulaon with OpenStreetMap map images 442

Time for acon – using breakpoints to explore your code 446

Time for acon – playing with zoom buon and map copyrights 449

Panel conclusion 452

Using the Console panel 452

Time for acon – execung code in the Console 453

Time for acon – creang object literals 454

Object literals 455

Time for acon – interacng with a map 456

The API documentaon 458

Table of Contents

[ xi ]

Improving Chrome and Developer Tools with extensions 458

JSONView 458

Dealing with color with ColorZilla 459

Debugging in other browsers 460

Debugging in Microso Internet Explorer 461

Debugging in Mozilla Firefox 462

Summary 464

Appendix D: Pop Quiz Answers 465

Chapter 3, Charng the Map Class 465

Chapter 5, Using Vector Layers 465

Chapter 7, Wrapping Our Heads Around Projecons 465

Chapter 8, Interacng with Your Map 466

Chapter 9, Taking Control of Controls 466

Chapter 10, OpenLayers Goes Mobile 466

Appendix B, More details on Closure Tools and Code Opmizaon Techniques 466

Appendix C, Squashing Bugs with Web Debuggers 467

Index 469

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