Tutorial by Examples: o

Editor attributes

[InitializeOnLoad] public class AttributesExample : MonoBehaviour { static AttributesExample() { [...] } [InitializeOnLoadMethod] private static void Foo() { [...] } } [InitializeOnLoad] public class AttributesExample : MonoBeh...

unity3d • Attributes

Using .PHONY for non-files targets

Use .PHONY to specify the targets that are not files, e.g., clean or mrproper. Good example .PHONY: clean clean: rm *.o temp Bad example clean: rm *.o temp In the good example make knows that clean is not a file, therefore it will not search if it is or not up to date and will ex...

makefile • .PHONY target

Installation or Setup

Detailed instructions on getting core-bluetooth set up or installed.

core-bluetooth • Getting started with core-bluetooth

Hello World!

"Hello World!" Also, check out the detailed discussion of how, when, whether and why to print a string.

R Language • Getting started with R Language

Drawing two rectangles on a

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Draw two rectangles on the canvas</title> <style> canvas{ border:1px solid gray; } </style> <script async...

HTML • Canvas

Adding dependencies from another project

project('projectA') { task A(dependsOn: ':projectB:B') << { println 'Hello from A' } } project('projectB') { task B << { println 'Hello from B' } } To refer to a task in another project, you prefix the name of the task with the path of the pr...

gradle • Task dependencies

Adding dependency using task object

task A << { println 'Hello from A' } task B << { println 'Hello from B' } B.dependsOn A It is an alternative way to define the dependency instead of using the task name. And the output is the same: > gradle -q B Hello from A Hello from B

gradle • Task dependencies

Hello world!

import React, { Component } from 'react'; import { AppRegistry, Text } from 'react-native'; class HelloWorldApp extends Component { render() { return ( <Text>Hello world!</Text> ); } } AppRegistry.registerComponent('HelloWorldApp', () => HelloWorldApp); ...

react-native • Hello World

Multiple dependencies with the dependsOn method

You can add multiple dependencies. task A << { println 'Hello from A' } task B(dependsOn: A) << { println 'Hello from B' } task C << { println 'Hello from C' } task D(dependsOn: ['B', 'C'] << { println 'Hello from D' } The output is: >...

gradle • Task dependencies

Remote module RMI

The remote module allows simple RMI (remote method invocation) of main process objects from renderer process. First create the main process in index.js const {app, BrowserWindow} = require('electron') let win = null app.on('ready', () => { win = new BrowserWindow() win.loadURL(`file://...

electron • Main and renderer process.

Synchronous IPC communication

Create index.js as const {app, BrowserWindow, ipcMain} = require('electron') let win = null app.on('ready', () => { win = new BrowserWindow() win.loadURL(`file://${__dirname}/index.html`) win.webContents.openDevTools() win.on('closed', () => { win = null }) }) ipcM...

electron • Main and renderer process.

Installation and Setup

To install React Router, just run the npm command npm install --save react-router And you're done. This is literally all you have to do to install react router. Please Note : react-router is dependent on react, So make sure you install react as well. To set up: using an ES6 transpiler, like bab...

React Router • Getting started with React Router

Exporting .csv files

Exporting using base R Data can be written to a CSV file using write.csv(): write.csv(mtcars, "mtcars.csv") Commonly-specified parameters include row.names = FALSE and na = "". Exporting using packages readr::write_csv is significantly faster than write.csv and does not ...

R Language • Reading and writing tabular data in plain-text files (CSV, TSV, etc.)

Draw behind existing shapes with "destination-over"

context.globalCompositeOperation = "destination-over" "destination-over" compositing places new drawing under existing drawings. context.drawImage(rainy,0,0); context.globalCompositeOperation='destination-over'; // sunny UNDER rainy context.drawImage(sunny,0,0);

html5-canvas • Compositing

Erase existing shapes with "destination-out"

context.globalCompositeOperation = "destination-out" "destination-out" compositing uses new shapes to erase existing drawings. The new shape is not actually drawn -- it is just used as a "cookie-cutter" to erase existing pixels. context.drawImage(apple,0,0); conte...

html5-canvas • Compositing

Default compositing: New shapes are drawn over Existing shapes

context.globalCompositeOperation = "source-over" "source-over" compositing [default], places all new drawings over any existing drawings. context.globalCompositeOperation='source-over'; // the default context.drawImage(background,0,0); context.drawImage(parachuter,0,0); ...

html5-canvas • Compositing

Clip images inside shapes with "destination-in"

context.globalCompositeOperation = "destination-in" "destination-in" compositing clips existing drawings inside a new shape. Note: Any part of the existing drawing that falls outside the new drawing is erased. context.drawImage(picture,0,0); context.globalCompositeOperation...

html5-canvas • Compositing

Clip images inside shapes with "source-in"

context.globalCompositeOperation = "source-in"; source-in compositing clips new drawings inside an existing shape. Note: Any part of the new drawing that falls outside the existing drawing is erased. context.drawImage(oval,0,0); context.globalCompositeOperation='source-in'; // pictu...

html5-canvas • Compositing

Detect errors when writing a value on Android

There are many reasons a write operation may fail. A frequent one is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the logcat output....

firebase • How do I listen for errors when accessing the database?

Code Editor Shortcuts

Generate code Alt+Insert Add comment lines Ctrl+Shift+C Remove comment lines Ctrl+/ Format selection Alt+Shift+F Fix all class imports Ctrl-Shift-I Fix selected class's import Alt+Shift+I Shift lines left Alt+Shift+← Shift lines right Alt+Shift+→ Shift lines up Alt+Shift+↑ Shift li...

netbeans • Shortcuts