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1
1<?php
2/**
3 * Pop PHP Framework (http://www.popphp.org/)
4 *
5 * @link       https://github.com/popphp/popphp-framework
6 * @author     Nick Sagona, III <dev@nolainteractive.com>
7 * @copyright  Copyright (c) 2009-2023 NOLA Interactive, LLC. (http://www.nolainteractive.com)
8 * @license    http://www.popphp.org/license     New BSD License
9 */
10
11/**
12 * @namespace
13 */
14namespace Pop\Image\Effect;
15
16use Pop\Image\AbstractEditObject;
17use Pop\Image\Color;
18
19/**
20 * Abstract effect class
21 *
22 * @category   Pop
23 * @package    Pop\Image
24 * @author     Nick Sagona, III <dev@nolainteractive.com>
25 * @copyright  Copyright (c) 2009-2023 NOLA Interactive, LLC. (http://www.nolainteractive.com)
26 * @license    http://www.popphp.org/license     New BSD License
27 * @version    3.4.0
28 */
29abstract class AbstractEffect extends AbstractEditObject implements EffectInterface
30{
31
32    /**
33     * Get the blend between 2 colors
34     *
35     * @param  Color\ColorInterface $color1
36     * @param  Color\ColorInterface $color2
37     * @param  int                  $tween
38     * @return array
39     */
40    public function getBlend(Color\ColorInterface $color1, Color\ColorInterface $color2, $tween)
41    {
42        if (!($color1 instanceof Color\Rgb)) {
43            $color1 = $color1->toRgb();
44        }
45        if (!($color2 instanceof Color\Rgb)) {
46            $color2 = $color2->toRgb();
47        }
48
49        $blend = ['r' => [], 'g' => [], 'b' => []];
50
51        $r1 = $color1->getR();
52        $g1 = $color1->getG();
53        $b1 = $color1->getB();
54
55        $r2 = $color2->getR();
56        $g2 = $color2->getG();
57        $b2 = $color2->getB();
58
59        $rTotal = $r2 - $r1;
60        $gTotal = $g2 - $g1;
61        $bTotal = $b2 - $b1;
62
63        for ($i = 0; $i <= $tween; $i++) {
64            $blend['r'][] = round($this->calculateSteps($i, $r1, $rTotal, $tween));
65            $blend['g'][] = round($this->calculateSteps($i, $g1, $gTotal, $tween));
66            $blend['b'][] = round($this->calculateSteps($i, $b1, $bTotal, $tween));
67        }
68
69        return $blend;
70    }
71
72    /**
73     * Calculate the steps between two points
74     *
75     * @param  int $curStep
76     * @param  int $start
77     * @param  int $end
78     * @param  int $totalSteps
79     * @return int
80     */
81    public function calculateSteps($curStep, $start, $end, $totalSteps)
82    {
83        return ($end * ($curStep / $totalSteps)) + $start;
84    }
85
86}