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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){
...
Android: alternate layout xml for landscape mode
...can I have one layout for landscape and one for portrait? I want to assume extra width and conserve vertical space when the user rotates the phone over sideways.
...
Python extending with - using super() Python 3 vs Python 2
Originally I wanted to ask this question , but then I found it was already thought of before...
5 Answers
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How do I check if the Java JDK is installed on Mac?
How do you check if Java SDK is installed on a Mac?
8 Answers
8
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Can you do a partial checkout with Subversion?
...ight find useful. From the documentation:
... sparse directories (or shallow checkouts) ... allows you to easily check out a working copy—or a portion of a working copy—more shallowly than full recursion, with the freedom to bring in previously ignored files and subdirectories at a later tim...
Difference between os.getenv and os.environ.get
...
@PreslavRachev minimal or not it is an extra function call, so there is some overhead. That being said, you probably don't need to retrieve env variables in the middle of your inner loop.
– pmav99
Feb 24 '19 at 14:08
...
Should MySQL have its timezone set to UTC?
...MySQL datetime fields and daylight savings time -- how do I reference the "extra" hour?
Converting negative values from FROM_UNIXTIME
Sources:
https://bugs.mysql.com/bug.php?id=68861
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html
http://dev.mysql.com/doc/refman/5.1/en/dateti...
Why does the expression 0 < 0 == 0 return False in Python?
...o say 0 < x <= 5 than to say (0 < x) and (x <= 5).
These are called chained comparisons. And that's a link to the documentation for them.
With the other cases you talk about, the parenthesis force one relational operator to be applied before the other, and so they are no longer chained...
In php, is 0 treated as empty?
...
The following things are considered to be empty:
"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
var $var; (a variable declared, but without a value in a class)
Note that this is exactly the same list...
Sending POST data in Android
...udhiskr for the comments. *
public class CallAPI extends AsyncTask<String, String, String> {
public CallAPI(){
//set context variables if required
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
...