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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...t multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the RotationDet...
How can I determine if a variable is 'undefined' or 'null'?
...
@ChrisStryczynski In example from your comment you declared y constant, but you ware comparing abc (not y). When I tested y via console.log(y == null); on Chrome and Firefox I got true as result. If you got error then maybe you tried to use assignm...
.htm vs .html ? Which file extension naming is more correct? [closed]
...ed to going to yoursite/contact.html and you change it to yoursite/contact.php you've broken that link. If you use yoursite/contact/ then there's no problem when you switch technology.
share
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impro...
ASP.NET MVC 4 Custom Authorize Attribute with Permission Codes (without roles)
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I've tried your example of HandleUnauthorizedRequest but when I specify the RouteValueDictionary, it just redirects to me a route that doesn't exist. It appends the route I want to redirect the user to to the route that the user wanted to acce...
To switch from vertical split to horizontal split fast in Vim
...re in the lower window, you just use ^WL.
– too much php
Aug 13 '09 at 2:17
9
.... The power... M...
Remove all special characters from a string in R?
...it's much easier to remove all punctuation characters.
x <- "a1~!@#$%^&*(){}_+:\"<>?,./;'[]-=" #or whatever
str_replace_all(x, "[[:punct:]]", " ")
(The base R equivalent is gsub("[[:punct:]]", " ", x).)
An alternative is to swap out all non-alphanumeric characters.
str_replace_all(...
How to append text to a text file in C++?
How to append text to a text file in C++? And create a new text file if it does not already exist and append text to it if it does exist.
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How to convert a string Date to long millseconds
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Using SimpleDateFormat
String string_date = "12-December-2012";
SimpleDateFormat f = new SimpleDateFormat("dd-MMM-yyyy");
try {
Date d = f.parse(string_date);
long milliseconds = d.getTime();
} catch (ParseException e) {
e.prin...
Equation for testing if a point is inside a circle
...adius,
double x, double y)
{
return x >= centerX - radius && x <= centerX + radius &&
y >= centerY - radius && y <= centerY + radius;
}
//test if coordinate (x, y) is within a radius from coordinate (center_x, center_y)
public boolea...
Can you call Directory.GetFiles() with multiple filters?
...er,
var files = Directory.EnumerateFiles("C:\\path", "*.*", SearchOption.AllDirectories)
.Where(s => s.EndsWith(".mp3") || s.EndsWith(".jpg"));
For earlier versions of .NET,
var files = Directory.GetFiles("C:\\path", "*.*", SearchOption.AllDirectories)
.Where(s => ...