<?php
/**
* @author ThemePunch <info@themepunch.com>
* @link https://www.themepunch.com/
* @copyright 2019 ThemePunch
*/
if(!defined('ABSPATH')) exit();
if(!class_exists('RSColorEasing')) {
class RSColorEasing {
public function __construct() {}
/**
* get the distance between two r/g/b values
* @since 6.0
*/
public static function distColor($px, $bx, $ex, $bv, $ev) {
$num = abs(((($px - $bx) / ($ex - $bx)) * ($ev - $bv)) + $bv);
$num = round($num);
$num = min($num, 255);
return max($num, 0);
}
/**
* get the distance between two alpha values
* @since 6.0
*/
public static function distAlpha($px, $bx, $ex, $bv, $ev) {
$bv = floatval($bv);
$num = floatval((($px - $bx) / ($ex - $bx)) * ($ev - $bv));
$num = number_format($num, 2, '.', '');
$num = abs($num + $bv);
$num = min($num, 1);
return max($num, 0);
}
/**
* insert easing colors to a gradient
* @since 6.0
*/
public static function insertPoints($start, $end, &$ar, $easing, $strength) {
$startPos = $start['position'];
$endPos = $end['position'];
if($startPos > $endPos) return;
$positions = array();
$point;
$val;
$px;
for($i = 0; $i < $strength; $i++) {
$val = RSColorEasing::easing($i, 0, 1, $strength, $easing);
$val = floatval($val);
$val = number_format($val, 2, '.', '');
$val = $val * ($endPos - $startPos) + $startPos;
if($val > $startPos && $val < $endPos) $positions[] = $val;
}
$len = count($positions);
$num = floatval(($endPos - $startPos) / ($len + 1));
$count = number_format($num, 2, '.', '');
$p = $count + $startPos;
for($i = 0; $i < $len; $i++) {
$px = $positions[$i];
if($px === $start['position']) continue;
$r = RSColorEasing::distColor($px, $startPos, $endPos, $start['r'], $end['r']);
$g = RSColorEasing::distColor($px, $startPos, $endPos, $start['g'], $end['g']);
$b = RSColorEasing::distColor($px, $startPos, $endPos, $start['b'], $end['b']);
$a = RSColorEasing::distAlpha($px, $startPos, $endPos, $start['a'], $end['a']);
$startA = RSColorpicker::sanitizeAlpha($start['a']);
$endA = RSColorpicker::sanitizeAlpha($end['a']);
$point = array(
'position' => $p,
'r' => $start['r'] !== $end['r'] ? round($r) : $start['r'],
'g' => $start['g'] !== $end['g'] ? round($g) : $start['g'],
'b' => $start['b'] !== $end['b'] ? round($b) : $start['b'],
'a' => $startA !== $endA ? RSColorpicker::sanitizeAlpha($a) : $startA
);
$p += $count;
$p = number_format(floatval($p), 2, '.', '');
$ar[] = $point;
}
}
/**
* easing equations
* @since 6.0
*/
public static function easing($n, $t, $e, $u, $ease = 'sine.easeinout') {
$easing = array('sine, easeinout');
if(is_string($ease) && strpos($ease, '.') !== false) {
$ease = explode('.', $ease);
if(count($ease) === 2) $easing = [$ease[0], $ease[1]];
}
switch($easing[0]) {
case 'quint':
switch($easing[1]) {
case 'easein':
return $e*(($n=$n/$u-1)*$n*$n*$n*$n+1)+$t;
break;
case 'easeout':
return $e*($n/=$u)*$n*$n*$n*$n+$t;
break;
case 'easeinout':
return ($n/=$u/2)<1?$e/2*$n*$n*$n*$n*$n+$t:$e/2*(($n-=2)*$n*$n*$n*$n+2)+$t;
break;
}
break;
case 'quad':
switch($easing[1]) {
case 'easein':
return $e*($n/=$u)*$n+$t;
break;
case 'easeout':
return -$e*($n/=$u)*($n-2)+$t;
break;
case 'easeinout':
return ($n/=$u/2)<1?$e/2*$n*$n+$t:-$e/2*(--$n*($n-2)-1)+$t;
break;
}
break;
case 'quart':
switch($easing[1]) {
case 'easein':
return $e*($n/=$u)*$n*$n*$n+$t;
break;
case 'easeout':
return -$e*(($n=$n/$u-1)*$n*$n*$n-1)+$t;
break;
case 'easeinout':
return ($n/=$u/2)<1?$e/2*$n*$n*$n*$n+$t:-$e/2*(($n-=2)*$n*$n*$n-2)+$t;
break;
}
break;
case 'cubic':
switch($easing[1]) {
case 'easein':
return $e*($n/=$u)*$n*$n+$t;
break;
case 'easeout':
return $e*(($n=$n/$u-1)*$n*$n+1)+$t;
break;
case 'easeinout':
return ($n/=$u/2)<1?$e/2*$n*$n*$n+$t:$e/2*(($n-=2)*$n*$n+2)+$t;
break;
}
break;
case 'circ':
switch($easing[1]) {
case 'easein':
return -$e*(sqrt(1-($n/=$u)*$n)-1)+$t;
break;
case 'easeout':
return $e*sqrt(1-($n=$n/$u-1)*$n)+$t;
break;
case 'easeinout':
return ($n/=$u/2)<1?-$e/2*(sqrt(1-$n*$n)-1)+$t:$e/2*(sqrt(1-($n-=2)*$n)+1)+$t;
break;
}
break;
case 'expo':
switch($easing[1]) {
case 'easein':
return 0===$n?$t:$e*pow(2,10*($n/$u-1))+$t;
break;
case 'easeout':
return $n===$u?$t+$e:$e*(1-pow(2,-10*$n/$u))+$t;
break;
case 'easeinout':
return 0===$n?$t:$n===$u?$t+$e:($n/=$u/2)<1?$e/2*pow(2,10*($n-1))+$t:$e/2*(2-pow(2,-10*--$n))+$t;
break;
}
break;
case 'bounce':
switch($easing[1]) {
case 'easein':
return $e-RSColorEasing::easing($u-$n,0,$e,$u,'bounce.easeout')+$t;
break;
case 'easeout':
if(($n/=$u)<(1/2.75)){return $e*(7.5625*$n*$n)+$t;}
else if($n<(2/2.75)){return $e*(7.5625*($n-=(1.5/2.75))*$n+0.75)+$t;}
else if ($n<(2.5/2.75)){return $e*(7.5625*($n-=(2.25/2.75))*$n+0.9375)+$t;}
else{return $e*(7.5625*($n-=(2.625/2.75))*$n+0.984375)+$t;}
break;
case 'easeinout':
if($n<$u/2){return RSColorEasing::easing($n*2,0,$e,$u,'bounce.easein')*0.5+$t;}
else{return RSColorEasing::easing($n*2-$u,0,$e,$u,'bounce.easeout')*0.5+$e*0.5+$t;}
break;
}
break;
default:
switch($easing[1]) {
case 'easein':
return -$e*cos($n/$u*(M_PI/2))+$e+$t;
break;
case 'easeout':
return $e*sin($n/$u*(M_PI/2))+$t;
break;
default:
return -$e/2*(cos(M_PI*$n/$u)-1)+$t;
// end default
}
// end default
}
return 0;
}
}
}