Tutorial by Examples: l

The loop macro has two forms: the "simple" form and the "extended" form. The extended form is covered in another documentation topic, but the simple loop is useful for very basic loop. The simple loop form takes a number of forms and repeats them until the loop is exited using ...

The name Smalltalk usually refers to ANSI Smalltalk or Smalltalk 80 (of which the first is based on). While most implementations are close to the standard, they vary in different aspects (usually referred to as dialects). Each implementation has it's own method of installation. Well known FOSS imp...

Care must be taken when initializing variables of type float to literal values or comparing them with literal values, because regular floating point literals like 0.1 are of type double. This may lead to surprises: #include <stdio.h> int main() { float n; n = 0.1; if (n > ...

Description This is a self-contained running example including/showcasing: minimum dependencies needed, Java Configuration, Bean declaration by annotation and Java Configuration, Dependency Injection by Constructor and by Property, and Pre/Post hooks. Dependencies These dependencies are needed in...

To do this first locate config folder in your root. Then open connections.js Locate // someMysqlServer: { // adapter: 'sails-mysql', // host: 'YOUR_MYSQL_SERVER_HOSTNAME_OR_IP_ADDRESS', // user: 'YOUR_MYSQL_USER', //optional // password: 'YOUR_MYSQL_PASSWORD', //optional /...

A problem: Canvas only remembers pixels, not shapes or images This is an image of a circular beach ball, and of course, you can't drag the ball around the image. It may surprise you that just like an image, if you draw a circle on a Canvas you cannot drag that circle around the canvas. That's be...

What is a "Shape"? You typically save your shapes by creating a JavaScript "shape" object representing each shape. var myCircle = { x:30, y:20, radius:15 }; Of course, you're not really saving shapes. Instead, you're saving the definition of how to draw the shapes. Then put...

Most Canvas drawings are either rectangular (rectangles, images, text-blocks) or circular (circles). Circles & rectangles have mathematical tests to check if the mouse is inside them. This makes testing circles and rectangles easy, quick and efficient. You can "hit-test" hundreds of c...

Here is an example of an IntentService that pretends to load images in the background. All you need to do to implement an IntentService is to provide a constructor that calls the super(String) constructor, and you need to implement the onHandleIntent(Intent) method. public class ImageLoaderIntentSe...

Given the 3 points of a quadratic curve the following function returns the length. function quadraticBezierLength(x1,y1,x2,y2,x3,y3) var a, e, c, d, u, a1, e1, c1, d1, u1, v1x, v1y; v1x = x2 * 2; v1y = y2 * 2; d = x1 - v1x + x3; d1 = y1 - v1y + y3; e = v1x - 2 * x1; ...

Open Script Editor. 2.12.4 With Mac OS X Leopard and earlier, and OS X Yosemite and later, Script Editor is located at /Applications/Utilities/Script Editor.app 2.12.4 Between Mac OS X Snow Leopard and OS X Mavericks inclusive, Script Editor is AppleScript Editor. /Applications/Utiliti...

In VBA, this attribute is ignored. It was not ported over from VB6. In VB6, it creates a Default Global Instance of the class (a "shortcut") so that class members can be accessed without using the class name. For example, DateTime (as in DateTime.Now) is actually part of the VBA.Conversio...

This attribute is ignored. It was not ported over from VB6. In VB6, it was used in combination with the VB_Exposed attribute to control accessibility of classes outside of the current project. VB_Exposed=True VB_Creatable=True Would result in a Public Class, that could be accessed from other ...

Creates a Global Default Instance of a class. The default instance is accessed via the name of the class. Declaration VERSION 1.0 CLASS BEGIN MultiUse = -1 'True END Attribute VB_Name = "Class1" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_Pr...

Warning! Apply shadows sparingly! Applying shadowing is expensive and is multiplicatively expensive if you apply shadowing inside an animation loop. Instead, cache a shadowed version of your image (or other drawing): At the start of your app, create a shadowed version of your image in a secon...

The traditional use of shadowing is to give 2-dimensional drawings the illusion of 3D depth. This example shows the same "button" with and without shadowing var canvas=document.createElement("canvas"); var ctx=canvas.getContext("2d"); document.body.appendChild(can...

let's generate a DataFrame first: df = pd.DataFrame(np.arange(10).reshape(5,2), columns=list('ab')) print(df) # Output: # a b # 0 0 1 # 1 2 3 # 2 4 5 # 3 6 7 # 4 8 9 drop rows with indexes: 0 and 4 using drop([...], inplace=True) method: df.drop([0,4], inplace=True) ...

INSERT INTO Invoices [ /* column names may go here */ ] VALUES (123, '1234abc', '2016-08-05 20:18:25.770', 321, 5, '2016-08-04'); Column names are required if the table you are inserting into contains a column with the IDENTITY attribute. INSERT INTO Invoices ([ID], [Num], [DateTime], [Tota...

CREATE TABLE [dbo].[Customers] ( CustomerID INT DEFAULT (NEXT VALUE FOR [dbo].[CustomersSeq]) NOT NULL, CustomerName VARCHAR(100), );

INSERT INTO [dbo].[Customers] ([CustomerName]) VALUES ('Jerry'), ('Gorge') SELECT * FROM [dbo].[Customers] Results CustomerIDCustomerName10001Jerry10002Gorge