Tutorial by Examples: an

Creating a chart that displays a static dataset is relatively simple. For example, if we have this array of objects as the data: var data = [ {title: "A", value: 53}, {title: "B", value: 12}, {title: "C", value: 91}, {title: "D", value: 24...

HTML: <div ng-app="myApp" ng-controller="Controller"> <some-chart data="data"></some-chart> </div> Javascript: angular.module('myApp', []) .directive('someChart', function() { return { restrict: 'E', scope: {dat...

Drawing text in canvas with your font from assets. Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/SomeFont.ttf"); Paint textPaint = new Paint(); textPaint.setTypeface(typeface); canvas.drawText("Your text here", x, y, textPaint);

<C-^> will switch to and from the previous edited file. On most keyboards <C-^> is CTRL-6. 3<C-^> will switch to buffer number 3. This is very quick, but only if you know the buffer number. You can see the buffer numbers from :ls or from a plugin such as MiniBufExplorer.

Often one want to show the result of a command executed by root to other users. The tee command allows easily to write a file with user perms from a command running as root: su -c ifconfig | tee ~/results-of-ifconfig.txt Only ifconfig runs as root.

An observable is created from the TextChanged event of the TextBox. Also any input is only selected if it's different from the last input and if there was no input within 0.5 seconds. The output in this example is sent to the console. Observable .FromEventPattern(textBoxInput, "TextChan...

A transaction is a sequential group of SQL statements such as select,insert,update or delete, which is performed as one single work unit. In other words, a transaction will never be complete unless each individual operation within the group is successful. If any operation within the transaction fai...

AUTOCOMMIT MySQL automatically commits statements that are not part of a transaction. The results of any UPDATE,DELETE or INSERT statement not preceded with a BEGIN or START TRANSACTION will immediately be visible to all connections. The AUTOCOMMIT variable is set true by default. This can be chan...

You can close a notification by using the .close() method. let notification = new Notification(title, options); // do some work, then close the notification notification.close() You can utilize the setTimeout function to auto-close the notification sometime in the future. let notification = n...

import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.util.ArrayList; import java.util.List; import javax.swing.JFrame; import javax.swing.JTextArea; import javax.sw...

Create a font extension using the IDE. See the iReport or Jaspersoft Studio documentation for details. The font extension can also be created manually. What are font extensions? Using a textElement you can specify a font (if not specified default font SansSerif is used) <textElement> &...

The NotifyPropertyChangedBaseclass below defines a generic Set method that can be called from any derived type. public class NotifyPropertyChangedBase : INotifyPropertyChanged { protected void RaisePropertyChanged([CallerMemberName] string propertyName = null) => PropertyChanged?.Invo...

Erlang on OpenBSD is currently broken on alpha, sparc and hppa architectures. Method 1 - Pre-built Binary Package OpenBSD let you choose desired version you want to install on your system: ###################################################################### # free-choice: ####################...

Consider the following partial example: import com.example.somelib.*; import com.acme.otherlib.*; public class Test { private Context x = new Context(); // from com.example.somelib ... } Suppose that when when you first developed the code against version 1.0 of somelib and versi...

An event stream to the server can be closed using the EventSource.close() method var eventSource = new EventSource("api/my-events"); // do things ... eventSource.close(); // you will not receive anymore events from this object The .close() method does nothing is the stream is already...

Executable JAR files are the simplest way to assemble Java code into a single file that can be executed. *(Editorial Note: Creation of JAR files should be covered by a separate Topic.) * Assuming that you have an executable JAR file with pathname <jar-path>, you should be able to run it as f...

Suppose that we wanted to create a simple Hello World document: In iText 7, we could do that like this: public void createPdf(String dest) throws IOException { PdfDocument pdf = new PdfDocument(new PdfWriter(dest)); Document document = new Document(pdf); document.add(new Paragraph...

A session is simply an array consisting of the following user information: The user's unique Session ID (this is a statistically random string with very strong entropy, hashed with MD5 for portability, and regenerated (by default) every five minutes) The user's IP Address The user's User Agent ...

Objective-C NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id item, NSDictionary *bindings) { return [item isKindOfClass:[UILabel class]]; }]; Swift let predicate = NSPredicate { (item, bindings) -> Bool...

Objective-C NSPredicate *predicate = [NSPredicate predicateWithFormat: @"self[SIZE] = %d", 5)]; Swift let predicate = NSPredicate(format: "self[SIZE] >= %d", 5) In this example, the predicate will match items that are arrays with length of at least 5.