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28

05

Concatena eventi da eseguire con Mootols chain

posted di Administrator, in script ajax. No Commenti

Tra tutti i framework javascript preferisco jquery, ma per concatenare gli eventi mootols offre una funzione che è davvero interessante.
Se dobbiamo eseguire piu azioni una dopo l'altra possiamo usare la funzione chain di mootools che ci permette di fare eseguire azioni concatenate.

Sito web: http://demos.mootools.net/Chain#

28

05

jQuery: jqGalScroll (Photo Gallery)

posted di Administrator, in jquery, script ajax. No Commenti

jQuery Gallery Scroller (jqGalScroll) takes list of images and creates a smooth scrolling photo gallery scrolling vertically, horizontally, or diagonally. The plugin will also create pagination to allow you to flow through your photos.

Sito web: http://benjaminsterling.com/jquery-jqgalscroll-photo-gallery/

28

05

Funzioni php sulle immagini

posted di Administrator, in php, tutorials. No Commenti

< ?php

function imageGreyscale($im){

// get image dimensions
$w = imagesx($im);
$h = imagesy($im);

$canvas = imagecreatetruecolor($w, $h);

for ($y = 0; $y < $h; $y++) {
for ($x = 0; $x < $w; $x++) {

$rgba = imagecolorat($im, $x, $y);
$r = ($rgba >> 16) & 0xFF;
$g = ($rgba >> 8) & 0xFF;
$b = $rgba & 0xFF;

$gray = round(.299 * $r + .587 * $g + .114 * $b);

// shift gray level to the left
$grayR = $gray < < 16; // R: red
$grayG = $gray << 8; // G: green
$grayB = $gray; // B: blue
$grayColor = $grayR | $grayG | $grayB;

// set the pixel color
imagesetpixel($canvas, $x, $y, $grayColor);
imagecolorallocate($canvas, $gray, $gray, $gray);
}
}

return $canvas;

}

function imageSquareThumb($im, $size){
// Creates a size x size thumbnail scaled from the image passed and returns another image
$ow = imagesx($im);
$oh = imagesy($im);

$thumb = imagecreatetruecolor($size,$size);
if($ow > $oh){
$off_w = ($ow-$oh)/2;
$off_h = 0;
$ow = $oh;
}elseif($oh > $ow){
$off_w = 0;
$off_h = ($oh-$ow)/2;
$oh = $ow;
}else{
$off_w = 0;
$off_h = 0;
}
imagecopyresampled($thumb, $im, 0, 0, $off_w, $off_h, $size, $size, $ow, $oh);
return $thumb;

}

function imageReflect($im, $dir = 1, $spread = 0.55, $decay = 15, $spacing = 0){
// Reflect an image pointer, returning a slightly larger image
//
// $dir: 1 == "vertical" reflection, 2 == "horizontal"
// $spread: % to reflect. defaults to 0.55, or 55% original image
// $decay: A value to adjust initial opacity and decaying visibility. lower == more visible

$w = imagesx($im);
$h = imagesy($im);

$vert = $dir & 1;
$hori = $dir & 2;

// calculate the size of our attachment
$nw = $vert ? $w : $w * $spread;
$nh = $hori ? $h : $h * $spread;

// add our reflection size to the height or width
$fw = $w + ($vert ? 0 : $nw);
$fh = $h + ($hori ? 0 : $nh);

$reflect = imagecreatetruecolor($fw, $fh);
imagealphablending($reflect, false);
$trans = imagecolorallocatealpha($reflect, 0, 0, 0, 127);
imageFill($reflect, 0, 0, $trans);

// put the orig on canvas at 0x0
imagecopy($reflect, $im, 0, 0, 0, 0, $w, $h);

if($vert){
// vertical
for($y = 0; $y < $nh; $y++){

$opacity = $decay + ceil(127 * (($y + $decay) / $h));
if($opacity > 127){ $opacity = 127; }

for($x = 0; $x < $nw; $x++){

$rgba = imagecolorat($im, $x, $h - $y - 1);

// break out to function:
$r = ($rgba & 0xFF0000) >> 16;
$g = ($rgba & 0x00FF00) >> 8;
$b = ($rgba & 0x0000FF);
$ttrans = imagecolorallocatealpha($reflect, $r, $g, $b, ($rgba >> 24 >= 124 ? 127 : $opacity));

imagesetpixel($reflect, $x, $y + $h + $spacing, $ttrans);

}
}
}

if($hori){
// horizontal
for($x = 0; $x < $nw; $x++){

$opacity = $decay + ceil(127 * (($x + $decay) / $nw));
if($opacity > 127){ $opacity = 127; }

for($y = 0; $y < $nh; $y++){

$rgba = imagecolorat($im, $w - $x - 1, $y);
// FIXME: if $rgba >> 24 === 127, we need to muck opacity and keep it invisible,
// otherwise our decay makes it visible but slightly opaque?

// break into funciton:
$red = ($rgba & 0xFF0000) >> 16;
$green = ($rgba & 0x00FF00) >> 8;
$blue = ($rgba & 0x0000FF);
$ttrans = imagecolorallocatealpha($reflect, $red, $green, $blue, ($rgba >> 24 >= 124 ? 127 : $opacity));

imagesetpixel($reflect, $x + $w + $spacing, $y, $ttrans);
}
}
}

imagesavealpha($reflect, true);
return $reflect;

}

function imageSkew($im, $angle, $dir = 0){
// Skews an image handle by some angle either left or right

$w = imagesx($im);
$h = imagesy($im);

$canvas = @imagecreatetruecolor($w, $h);

imagealphablending($canvas, false);
$trans = imagecolorallocatealpha($canvas, 0, 0, 0, 127);
imagefill($canvas, 0,0, $trans);

// Pixel differences
$diff = ($angle / 90);

// Loop trough each width pixel
$currentHeight = $h;
$currentY = 0;
if($dir == 1){
$currentHeight = 0;
$currentY = $h;
}
for($i = 0; $i < $w; $i++){
// Take 1*height sample and copy to iCanvas
if($dir == 0){
imagecopyresampled($canvas, $im, $i, $currentY, $i, 0, 1, $currentHeight, 1, $h);
$currentHeight = $currentHeight - ($diff * 2);
$currentY = ($h - $currentHeight) / 2;
}else{
imagecopyresampled($canvas, $im, ($w - $i), $currentY, ($w - $i), 0, 1, $currentHeight, 1, $h);
$currentHeight = $h - ( $i * ($diff * 2) );
$currentY = ($h - $currentHeight) / 2;
}