Tutorial by Examples: t

Most Popular Plugins

cordova-plugin-battery-status - used for monitoring device's battery status. cordova-plugin-camera - provides an API for taking pictures and for choosing images from the system's image library. cordova-plugin-contacts - provides access to the device contacts database. cordova-plug...

Cordova • Cordova plugins: how to install, how they work, examples

Crop Image after clicking using camera or selecting image.

It crops the images in square shape. This cordova project uses two plugins: Cordova Camera Plugin -- https://github.com/apache/cordova-plugin-camera Cordova Crop Image Plugin -- https://github.com/jeduan/cordova-plugin-crop The Camera plugin is combined with the Crop Image Plugin by ...

Cordova • Cordova Crop Image Plugin

TestFixture

[TestFixture] public class Tests { [Test] public void Test1() { Assert.That(true, Is.EqualTo(true)); } } A test fixture marks a class as containing tests.

nunit • Attributes

Drawing with the draw module

Pygame has a module, pygame.draw, that contains functions which can draw shapes directly to a Surface. FunctionDescriptionpygame.draw.rectdraw a rectangle shapepygame.draw.polygondraw a shape with any number of sidespygame.draw.circledraw a circle around a pointpygame.draw.ellipsedraw a round shape...

pygame • Drawing on the screen

Transparency

There are kinds 3 of transparency supported in pygame: colorkeys, Surface alphas, and per-pixel alphas. Colorkeys Makes a color fully transparent, or more accurately, making a color simply not be blit. If you have an image with a black rect inside you could set a colorkey to prevent the black colo...

pygame • Drawing on the screen

Introduction

You can always run JavaScript from inside itself, although this is strongly discouraged due to the security vulnerabilities it presents (see Remarks for details). To run JavaScript from inside JavaScript, simply use the below function: eval("var a = 'Hello, World!'");

JavaScript • Evaluating JavaScript

Evaluation and Math

You can set a variable to something with the eval() function by using something similar to the below code: var x = 10; var y = 20; var a = eval("x * y") + "<br>"; var b = eval("2 + 2") + "<br>"; var c = eval("x + 17") + "<br&...

JavaScript • Evaluating JavaScript

Custom fade in/fade out visibility binding

This example implements a custom binding that toggles visibility (similar to the existing visible binding), but will utilize jQuery's fading API to animate the transition from visible to invisible. Custom binding definition: //Add a custom binding called "fadeVisible" by adding it as a p...

knockout.js • Custom Bindings

DIVIDE statement formats

DIVIDE a INTO b c d Data item b, c, and d are changed as b/a, c/a and d/a. DIVIDE a INTO b GIVING c Data item c is changed as b/a. DIVIDE a BY b GIVING c Data item c is changed as a/b. DIVIDE a INTO b GIVING q REMAINDER r Data items q and r are set with results of b/a DIVIDE a BY b G...

cobol • DIVIDE statement

A three condition EVALUATE

EVALUATE a ALSO b ALSO TRUE WHEN 1 ALSO 1 THRU 9 ALSO c EQUAL 1 PERFORM all-life WHEN 2 ALSO 1 THRU 9 ALSO c EQUAL 2 PERFORM life WHEN 3 THRU 9 ALSO 1 ALSO c EQUAL 9 PERFORM disability WHEN OTHER PERFORM invalid END-EVALUATE

cobol • EVALUATE statement

EXIT statement

PERFORM VARYING counter FROM 1 BY 1 UNTIL counter > 10 IF debug-override THEN EXIT PERFORM IF counter = 5 THEN EXIT PERFORM CYCLE PERFORM some-miracle END-PERFORM

cobol • EXIT statement

Custom text replace binding

This example is a custom binding that replaces text whenever an input value is updated. In this case, spaces will be replaced with "+". It is intended to be used alongside the existing value binding, and shows binding with an object literal. Sample markup with the replaceText binding: &l...

knockout.js • Custom Bindings

Open camara and photo gallery

index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="Content-Security-Policy" content="default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' *; style-src 'self' 'unsafe-inline' *"/> ...

ionic-framework • Device camera and photo library access from Ionic application

Combining constants with flags

Using the IntDef#flag() attribute set to true, multiple constants can be combined. Using the same example in this topic: public abstract class Car { //Define the list of accepted constants @IntDef(flag=true, value={MICROCAR, CONVERTIBLE, SUPERCAR, MINIVAN, SUV}) //Tell the compi...

Android • Typedef Annotations: @IntDef, @StringDef

Installation or Setup

Detailed instructions on getting opencart set up or installed.

opencart • Getting started with opencart

Celery Configuration

CELERY Installation - pip install django-celery Add Basic project structure. - src/ - bin/celery_worker_start # will be explained later on - logs/celery_worker.log - stack/__init __.py - stack/celery.py - stack/settings.py - stack/urls.py - manage.py ...

Django • Running Celery with Supervisor

Display the source code of an object

Objects that are not built-in To print the source code of a Python object use inspect. Note that this won't work for built-in objects nor for objects defined interactively. For these you will need other methods explained later. Here's how to print the source code of the method randint from the ran...

Python Language • Accessing Python source code and bytecode

Null Object Java using enum

Given an interface: public interface Logger { void log(String message); } Rather than usage: public void doJob(Logger logger) { if (logger != null) { logger.log("[doJob]:Step 1"); } // ... if (logger != null) { logger.log("[doJob]:Step 2&q...

Design patterns • Null Object pattern

Named operators

You can extend C++ with named operators that are "quoted" by standard C++ operators. First we start with a dozen-line library: namespace named_operator { template<class D>struct make_operator{constexpr make_operator(){}}; template<class T, char, class O> struct half_a...

C++ • Operator Overloading

Pre/Post Increment/Decrement operators

In C, there are two unary operators - '++' and '--' that are very common source of confusion. The operator ++ is called the increment operator and the operator -- is called the decrement operator. Both of them can be used used in either prefix form or postfix form. The syntax for prefix form for ++ ...

C Language • Side Effects