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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){
...
C# Entity-Framework: How can I combine a .Find and .Include on a Model Object?
...=> p.Blog).Load();
// Load the blog related to a given post using a string
context.Entry(post).Reference("Blog").Load();
var blog = context.Blogs.Find(1);
// Load the posts related to a given blog
context.Entry(blog).Collection(p => p.Posts).Load();
// Load the posts rel...
How to return a value from a Form in C#?
...
Create some public Properties on your sub-form like so
public string ReturnValue1 {get;set;}
public string ReturnValue2 {get;set;}
then set this inside your sub-form ok button click handler
private void btnOk_Click(object sender,EventArgs e)
{
this.ReturnValue1 = "Something";
...
usr/bin/ld: cannot find -l
... not be appropriate to change the Makefile with the -Loption. I had put my extra library in /opt/lib so I did:
$ export LIBRARY_PATH=/opt/lib/
and then ran make for successful compilation and linking.
To run the program with a shared library define:
$ export LD_LIBRARY_PATH=/opt/lib/
before ...
How to find the kth largest element in an unsorted array of length n in O(n)?
...not very good.
Everything you need is in these powerpoint slides. Just to extract the basic algorithm of the O(n) worst-case algorithm (introselect):
Select(A,n,i):
Divide input into ⌈n/5⌉ groups of size 5.
/* Partition on median-of-medians */
medians = array of each group’s med...
How to check if running as root in a bash script
...
I think is better to compare string with string, number with number. using double brackets, you could use > directly with no quotation [[ $EUID > 0 ]]
– Sergio Abreu
Jan 3 '17 at 2:29
...
How to get a user's client IP address in ASP.NET?
...otcha: HTTP_X_FORWARDED_FOR returns multiple IP addresses"
C#
protected string GetIPAddress()
{
System.Web.HttpContext context = System.Web.HttpContext.Current;
string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!string.IsNullOrEmpty(ipAddress))
{
...
How to change background color in android app
...:background="@color/white"
Also you need to add a value for white in the strings.xml
<color name="white">#FFFFFF</color>
Edit : 18th Nov 2012
The first two letters of an 8 letter color code provide the alpha value, if you are using the html 6 letter color notation the color is opaq...
How do I serialize a C# anonymous type to a JSON string?
..., Age = 30};
JavaScriptSerializer serializer = new JavaScriptSerializer();
string json = serializer.Serialize(obj);
Namespace: System.Web.Script.Serialization.JavaScriptSerializer
share
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improve ...
Which Eclipse files belong under version control?
...kly import in their Eclipse workspace, just because you happen to have one extra definition that would fit only your need of the moment.
– VonC
Nov 28 '11 at 19:03
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