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How to determine if a point is in a 2D triangle? [closed]
... d2 = sign(pt, v2, v3);
d3 = sign(pt, v3, v1);
has_neg = (d1 < 0) || (d2 < 0) || (d3 < 0);
has_pos = (d1 > 0) || (d2 > 0) || (d3 > 0);
return !(has_neg && has_pos);
}
share
...
Run command on the Ansible host
...ou want to run an entire play on the Ansible host, then specify hosts: 127.0.0.1 and connection:local in the play, for example:
- name: a play that runs entirely on the ansible host
hosts: 127.0.0.1
connection: local
tasks:
- name: check out a git repository
git: repo=git://foosball.exa...
Prevent body scrolling but allow overlay scrolling
...and overflow-y: scroll, with top, left, right and bottom properties set to 0: this style makes the overlay fill the whole viewport.
The div inside the overlay is instead just in position: static then the vertical scrollbar you see is related to that element. As a result the content is scrollable b...
How to make rounded percentages add up to 100%
...ff = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0);
return _.chain(l).
sortBy(function(x) { return Math.round(x) - x }).
map(function(x, i) { return Math.round(x) + (off > i) - (i >= (l.length + off)) }).
value();
}
foo([13.62...
How are multi-dimensional arrays formatted in memory?
...things are going to happen. Here's a quick example:
int array1[3][2] = {{0, 1}, {2, 3}, {4, 5}};
In memory looks like this:
0 1 2 3 4 5
exactly the same as:
int array2[6] = { 0, 1, 2, 3, 4, 5 };
But if you try to pass array1 to this function:
void function1(int **a);
you'll get a warnin...
parseInt vs unary plus, when to use which?
..., here are a few differences I know of:
An empty string "" evaluates to a 0, while parseInt evaluates it to NaN. IMO, a blank string should be a NaN.
+'' === 0; //true
isNaN(parseInt('',10)); //true
The unary + acts more like parseFloat since it also accepts decimals.
parseInt on...
How do you convert a byte array to a hexadecimal string, and vice versa?
...
1402
Either:
public static string ByteArrayToString(byte[] ba)
{
StringBuilder hex = new StringBu...
Create a pointer to two-dimensional array
...
10 Answers
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Sending a message to nil in Objective-C
As a Java developer who is reading Apple's Objective-C 2.0 documentation: I wonder what " sending a message to nil " means - let alone how it is actually useful. Taking an excerpt from the documentation:
...
Does opacity:0 have exactly the same effect as visibility:hidden
... in the taborder
collapse events taborder
opacity: 0 No Yes Yes
visibility: hidden No No No
visibility: collapse Yes* No No
display: none Yes No No
* Yes inside a table element, otherwise No.
...