Automatic labels over map polygons

Type tutorial

During the course of this article we’re going to learn how to automatically place labels over map polygons, as well as make them positioned just the right way. Base map As a polygon of our development, let’s use a map of the United States in an Albers USA projection. Series for polygons Setting up Polygon […]

Using Albers USA projection

Type tutorial

The most common depiction of a map of the United States is one that shows Alaska and Hawaii placed right below mainland USA. This allows this map to be more compact and usable, in comparison how it would be if both of those states were in their usual places. This way of depicting USA map […]

Generating multi-content PDF export

Type tutorial

This extensive tutorial will show how you can use pdfmake library, which is bundled with amCharts, to generate full page, multi-content report PDF documents. Disclaimer Majority of this tutorial is based on using pdfmake. It’s an excellent third party library enabling generating PDF documents in JavaScript. Our aim is to walk you through basics of […]

Hide map images until zoomed in

Type tutorial

Showing a lot of markers on the map may render it cluttered beyond usability. This tutorial will show how you can easily specify custom zoom levels for each individual image to be shown at. The problem Say we have a map with a lot of images in a MapImageSeries: While not exactly “unusable”, still a […]

Automating report generation using Selenium Webdriver

Type tutorial

If you need to automate the generation of chart images or PDF, Selenium Webdriver might be the best option. It can handle different browsers even though this example only shows it using Firefox. Setting up Install NodeJS Install Firefox Create a folder Create a file called package.json in the new folder with the content shown […]

Chart element class names and CSS

Type tutorial

amCharts 4 allows automatically adding element-specific class attributes to its SVG elements for easy targeting via CSS selectors. This tutorial explains how to enable and use them. Enabling class names By default, when chart is generating SVG elements, no class attributes are added to it’s element. Let’s take a simple Line series with bullets: The […]

Lazy loading amCharts modules

Type tutorial

It is possible to load the amCharts library only when needed. This tutorial will explain how. The import() expression is the official way to lazy load any ES6 module, including amCharts. However, import() can only import a single module, so you have to combine it with Promise.all to load multiple modules. Here is how to […]

Retrieving latitude/longitude of map click

Type tutorial

This tutorial will show how we can retrieve latitude / longitude coordinates of a click on map. The task When user clicks or taps anywhere on the Map, we want to retrieve the geographical coordinates (latitude and longitude) of the target point. We also want to make something useful with it, say, placing a marker […]

Retrieving information of a clicked Map Object

Type tutorial

In this tutorial we’ve seen how we can zoom in on a clicked country. We’re going to build on that to retrieve information about clicked object. Base map As mentioned in the preamble, we’re going to be using a map, created in another tutorial. The “Zooming to a map area on click” tutorial explains how […]

Using curved labels

Type tutorial

In amCharts 4 any SVG label can follow any curve. This tutorial will explain how it works and how you can spice up the look of your charts in various situations, using curved labels. The basics All text labels in amCharts 4 are represented by an object of type Label. To make a label follow […]