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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...alizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotate", String.format("Vector1 (%f,%f) Vector2 (%f,%f)", v1x,v1y,v2x,v2y));
float angle = (float)Math.toDegrees(angle1-angle2);
return angle;
}
private float normalizeAngle(float angle,float x, float y){
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PHP function to generate v4 UUID
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UUID's aren't just random strings. There is a spec to how it works. To generate a proper random UUID that I don't have to worry about getting rejected later, I'd rather use a tested library than roll my own implementation.
– Br...
Boolean.hashCode()
...s a sensible prime for hashcode calculation?
Why does Java's hashCode() in String use 31 as a multiplier?
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Catching “Maximum request length exceeded”
...s ago, but I still want to ask whether this worked fine till now? does the string comparison of 'GetEntireRawContent' work fine? I don't think this is a timeout issue. is there anyone standing out for pointing me to uncloudy somewhere regarding this?
– Elaine
M...
Should I use AppDomain.CurrentDomain.BaseDirectory or System.Environment.CurrentDirectory?
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I usually use something like:
string AppPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
AppPath = AppPath.Replace("file:\\", "");
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Is it possible to specify a starting number for an ordered list?
...L 1.0's transitional DTD but not in XHTML 1.0's strict DTD (search for the string ATTLIST ol and check the attribute list). So in spite of what some of the older comments say, the start attribute was not deprecated; rather it was invalid in the strict DTDs of HTML 4.01 and XHTML 1.0. In spite of wha...
Single script to run in both Windows batch and Linux Bash?
...er cmd code is to use heredocs so that sh treats the cmd code as an unused string and cmd interprets it. In this case, we make sure that our heredoc’s delimiter is both quoted (to stop sh from doing any sort of interpretation on its contents when running with sh) and starts with : so that cmd skip...
XSLT equivalent for JSON [closed]
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This code uses string.eval() ... :-(
– dreftymac
Oct 17 '12 at 1:10
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Getting pids from ps -ef |grep keyword
...rep "keyword" to determine the pid of a daemon process (there is a unique string in output of ps -ef in it).
6 Answers
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How to preserve line breaks when storing a command output to a variable in bash?
... (one of which is a newline). Then, before invoking echo shell splits that string into multiple arguments using the Internal Field Separator (IFS), and passes that resulting list of arguments to echo. By default, the IFS is set to whitespace (spaces, tabs, and newlines), so the shell chops your $TEM...