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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
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float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
How to format a floating number to fixed width in Python
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In Python 3.
GPA = 2.5
print(" %6.1f " % GPA)
6.1f means after the dots 1 digits show if you print 2 digits after the dots you should only %6.2f such that %6.3f 3 digits print after the point.
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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...
float v1x = fX-sX;
float v1y = -(fY-sY);
float v2x = nfX-nsX;
float v2y = -(nfY-nsY);
float angle1 = normalizeAngle((float) Math.atan2(v1y, v1x),v1x,v1y);
float angle2 = normalizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotat...
Where is svcutil.exe in Windows 7?
... Why would they remove it? Don't know. Anyway I was able to install the 6.1 version of the SDK, which still contains svcutil.exe (in the bin folder), using Chocolatey, from here: chocolatey.org/packages/windows-sdk-6.1
– David Barrows
Jul 24 '17 at 14:28
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Google Maps Android API v2 Authorization failure
...t https://code.google.com/apis/console/
to enable "Google Maps Android API v2"
to register of SHA1 in project (NOW, YOU NEED WRITE SHA1;your.app.package.name) at APIs console and get API KEY
to copy directory ANDROID_SDK_DIR/extras/google/google_play_services/libproject/google-play-services_lib to ...
How to copy commits from one branch to another?
...really have a workflow that lets you do this all by merging:
- x - x - x (v2) - x - x - x (v2.1)
\
x - x - x (wss)
So all you have to do is git checkout v2.1 and git merge wss. If for some reason you really can't do this, and you can't use git rebase to move your wss branch...
Difference between single quotes and double quotes in Javascript [duplicate]
... spaces.
BUT... it doesn't work on mobile Safari (iPhone 3GS running iOS 6.1). To make it work on mobile Safari, you have to use double quotes:
var searchArray = searchValue.split(" "); // Split a string at the spaces.
If you don't use double quotes, it doesn't split, it just puts the whole st...
Javascript Array.sort implementation?
...iddle element.
var v0 = a[from];
var v1 = a[to - 1];
var v2 = a[third_index];
var c01 = comparefn(v0, v1);
if (c01 > 0) {
// v1 < v0, so swap them.
var tmp = v0;
v0 = v1;
v1 = tmp;
} // v0 <= v1.
var c02 = comparefn(v...