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How to fix getImageData() error The canvas has been tainted by cross-origin data?
...revent hackers from uploading PHP scripts and pwning your system
if(!@is_array(getimagesize($url))){
echo "path/to/placeholderImage.png";
exit("wrong file type.");
}
$img = file_get_contents($url);
$fn = substr(strrchr($url, "/"), 1);
file_put_contents($fn,$img);
echo $fn;
?&g...
How to check if a string is a valid hex color representation?
...alues of a color.
If input is not a color, returns NULL, else returns an array of 4 values:
red (0-255), green (0-255), blue (0-255), alpha (0-1)
*/
function getRGBA(value) {
// get/create a 0 pixel element at the end of the document, to use to test properties against the client browser
var...
How do shift operators work in Java? [duplicate]
... any sign-extended bits so that the value can be used as an index into the array of hexadecimal characters.
// Masking sign extension.
class HexByte {
static public void main(String args[]) {
char hex[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e',...
How to run a single test from a rails test suite?
...folder. For example, if I want to run the test activesupport/test/core_ext/array_ext_test.rb I should be in activesupport/ first.
– Vincent B.
May 11 '12 at 7:13
3
...
Reading a binary file with python
...ince I don't know Fortran):
import binaryfile
def particle_file(f):
f.array('group_ids') # Declare group_ids to be an array (so we can use it in a loop)
f.skip(4) # Bytes 1-4
num_particles = f.count('num_particles', 'group_ids', 4) # Bytes 5-8
f.int('num_groups', 4) # Bytes 9-12...
Possible to make labels appear when hovering over a point in matplotlib?
...p.random.seed(1)
x = np.random.rand(15)
y = np.random.rand(15)
names = np.array(list("ABCDEFGHIJKLMNO"))
c = np.random.randint(1,5,size=15)
norm = plt.Normalize(1,4)
cmap = plt.cm.RdYlGn
fig,ax = plt.subplots()
sc = plt.scatter(x,y,c=c, s=100, cmap=cmap, norm=norm)
annot = ax.annotate("", xy=(0,...
gulp.run is deprecated. How do I compose tasks?
...pass a function (though you still can) to run tasks. You can give watch an array of task names and it will do this for you.
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Variable number of arguments in C++?
...er of arguments is great for debug or for functions/methods that fill some array. Also it's great for many mathematical operations, such as max, min, sum, average... It's not mess when you don't mess with it.
– Tomáš Zato - Reinstate Monica
Dec 5 '14 at 20:49...
Difference between single quotes and double quotes in Javascript [duplicate]
...y been testing on desktop Firefox. This works fine on Firefox:
var searchArray = searchValue.split(' '); // Split a string at the 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 = sea...
uint8_t vs unsigned char
...racter at every position -- in other words that each element of the string/array is an arbitrary integer that one shouldn't make any semantic assumptions about. Of course all C programmers know this, but it may push beginners to ask the right questions.
– tne
J...