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305 lines
14 KiB
PHP
305 lines
14 KiB
PHP
<?php declare(strict_types=1);
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namespace openvk\Web\Util\Makima;
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use openvk\Web\Models\Entities\Photo;
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class Makima
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{
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private $photos;
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const ORIENT_WIDE = 0;
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const ORIENT_REGULAR = 1;
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const ORIENT_SLIM = 2;
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function __construct(array $photos)
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{
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if(sizeof($photos) < 2)
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throw new \LogicException("Minimum attachment count for tiled layout is 2");
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$this->photos = $photos;
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}
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private function getOrientation(Photo $photo, &$ratio): int
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{
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[$width, $height] = $photo->getDimensions();
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$ratio = $width / $height;
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if($ratio >= 1.2)
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return Makima::ORIENT_WIDE;
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else if($ratio >= 0.8)
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return Makima::ORIENT_REGULAR;
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else
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return Makima::ORIENT_SLIM;
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}
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private function calculateMultiThumbsHeight(array $ratios, float $w, float $m): float
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{
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return ($w - (sizeof($ratios) - 1) * $m) / array_sum($ratios);
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}
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private function extractSubArr(array $arr, int $from, int $to): array
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{
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return array_slice($arr, $from, sizeof($arr) - $from - (sizeof($arr) - $to));
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}
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function computeMasonryLayout(float $maxWidth, float $maxHeight): MasonryLayout
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{
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$orients = [];
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$ratios = [];
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$count = sizeof($this->photos);
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$result = new MasonryLayout;
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foreach($this->photos as $photo) {
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$orients[] = $this->getOrientation($photo, $ratio);
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$ratios[] = $ratio;
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}
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$avgRatio = array_sum($ratios) / sizeof($ratios);
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if($maxWidth < 0)
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$maxWidth = $maxHeight = 510;
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$maxRatio = $maxWidth / $maxHeight;
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$marginWidth = $marginHeight = 2;
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switch($count) {
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case 2:
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if(
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$orients == [Makima::ORIENT_WIDE, Makima::ORIENT_WIDE] # two wide pics
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&& $avgRatio > (1.4 * $maxRatio) && abs($ratios[0] - $ratios[1]) < 0.2 # that can be positioned on top of each other
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) {
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$computedHeight = ceil( min( $maxWidth / $ratios[0], min( $maxWidth / $ratios[1], ($maxHeight - $marginHeight) / 2 ) ) );
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$result->colSizes = [1];
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$result->rowSizes = [1, 1];
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$result->width = ceil($maxWidth);
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$result->height = $computedHeight;
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$result->tiles = [new ThumbTile(1, 1, $maxWidth, $computedHeight), new ThumbTile(1, 1, $maxWidth, $computedHeight)];
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} else if(
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$orients == [Makima::ORIENT_WIDE, Makima::ORIENT_WIDE]
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|| $orients == [Makima::ORIENT_REGULAR, Makima::ORIENT_REGULAR] # two normal pics of same ratio
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) {
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$computedWidth = ($maxWidth - $marginWidth) / 2;
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$height = min( $computedWidth / $ratios[0], min( $computedWidth / $ratios[1], $maxHeight ) );
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$result->colSizes = [1, 1];
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$result->rowSizes = [1];
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$result->width = ceil($maxWidth);
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$result->height = ceil($height);
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$result->tiles = [new ThumbTile(1, 1, $computedWidth, $height), new ThumbTile(1, 1, $computedWidth, $height)];
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} else /* next to each other, different ratios */ {
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$w0 = (
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($maxWidth - $marginWidth) / $ratios[1] / ( (1 / $ratios[0]) + (1 / $ratios[1]) )
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);
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$w1 = $maxWidth - $w0 - $marginWidth;
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$h = min($maxHeight, min($w0 / $ratios[0], $w1 / $ratios[1]));
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$result->colSizes = [ceil($w0), ceil($w1)];
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$result->rowSizes = [1];
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$result->width = ceil($w0 + $w1 + $marginWidth);
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$result->height = ceil($h);
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$result->tiles = [new ThumbTile(1, 1, $w0, $h), new ThumbTile(1, 1, $w1, $h)];
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}
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break;
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case 3:
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# Three wide photos, we will put two of them below and one on top
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if($orients == [Makima::ORIENT_WIDE, Makima::ORIENT_WIDE, Makima::ORIENT_WIDE]) {
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$hCover = min($maxWidth / $ratios[0], ($maxHeight - $marginHeight) * (2 / 3));
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$w2 = ($maxWidth - $marginWidth) / 2;
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$h = min($maxHeight - $hCover - $marginHeight, min($w2 / $ratios[1], $w2 / $ratios[2]));
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$result->colSizes = [1, 1];
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$result->rowSizes = [ceil($hCover), ceil($h)];
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$result->width = ceil($maxWidth);
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$result->height = ceil($marginHeight + $hCover + $h);
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$result->tiles = [
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new ThumbTile(2, 1, $maxWidth, $hCover),
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new ThumbTile(1, 1, $w2, $h), new ThumbTile(1, 1, $w2, $h),
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];
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} else /* Photos have different sizes or are not wide, so we will put one to left and two to the right */ {
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$wCover = min($maxHeight * $ratios[0], ($maxWidth - $marginWidth) * (3 / 4));
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$h1 = ($ratios[1] * ($maxHeight - $marginHeight) / ($ratios[2] + $ratios[1]));
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$h0 = $maxHeight - $marginHeight - $h1;
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$w = min($maxWidth - $marginWidth - $wCover, min($h1 * $ratios[2], $h0 * $ratios[1]));
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$result->colSizes = [ceil($wCover), ceil($w)];
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$result->rowSizes = [ceil($h0), ceil($h1)];
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$result->width = ceil($w + $wCover + $marginWidth);
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$result->height = ceil($maxHeight);
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$result->tiles = [
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new ThumbTile(1, 2, $wCover, $maxHeight), new ThumbTile(1, 1, $w, $h0),
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new ThumbTile(1, 1, $w, $h1),
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];
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}
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break;
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case 4:
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# Four wide photos, we will put one to the top and rest below
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if($orients == [Makima::ORIENT_WIDE, Makima::ORIENT_WIDE, Makima::ORIENT_WIDE, Makima::ORIENT_WIDE]) {
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$hCover = min($maxWidth / $ratios[0], ($maxHeight - $marginHeight) / (2 / 3));
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$h = ($maxWidth - 2 * $marginWidth) / (array_sum($ratios) - $ratios[0]);
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$w0 = $h * $ratios[1];
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$w1 = $h * $ratios[2];
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$w2 = $h * $ratios[3];
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$h = min($maxHeight - $marginHeight - $hCover, $h);
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$result->colSizes = [ceil($w0), ceil($w1), ceil($w2)];
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$result->rowSizes = [ceil($hCover), ceil($h)];
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$result->width = ceil($maxWidth);
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$result->height = ceil($hCover + $marginHeight + $h);
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$result->tiles = [
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new ThumbTile(3, 1, $maxWidth, $hCover),
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new ThumbTile(1, 1, $w0, $h), new ThumbTile(1, 1, $w1, $h), new ThumbTile(1, 1, $w2, $h),
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];
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} else /* Four photos, we will put one to the left and rest to the right */ {
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$wCover = min($maxHeight * $ratios[0], ($maxWidth - $marginWidth) * (2 / 3));
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$w = ($maxHeight - 2 * $marginHeight) / (1 / $ratios[1] + 1 / $ratios[2] + 1 / $ratios[3]);
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$h0 = $w / $ratios[1];
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$h1 = $w / $ratios[2];
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$h2 = $w / $ratios[3] + $marginHeight;
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$w = min($w, $maxWidth - $marginWidth - $wCover);
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$result->colSizes = [ceil($wCover), ceil($w)];
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$result->rowSizes = [ceil($h0), ceil($h1), ceil($h2)];
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$result->width = ceil($wCover + $marginWidth + $w);
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$result->height = ceil($maxHeight);
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$result->tiles = [
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new ThumbTile(1, 3, $wCover, $maxHeight), new ThumbTile(1, 1, $w, $h0),
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new ThumbTile(1, 1, $w, $h1),
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new ThumbTile(1, 1, $w, $h2),
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];
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}
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break;
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default:
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// как лопать пузырики
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$ratiosCropped = [];
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if($avgRatio > 1.1) {
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foreach($ratios as $ratio)
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$ratiosCropped[] = max($ratio, 1.0);
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} else {
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foreach($ratios as $ratio)
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$ratiosCropped[] = min($ratio, 1.0);
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}
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$tries = [];
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$firstLine;
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$secondLine;
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$thirdLine;
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# Try one line:
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$tries[$firstLine = $count] = [$this->calculateMultiThumbsHeight($ratiosCropped, $maxWidth, $marginWidth)];
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# Try two lines:
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for($firstLine = 1; $firstLine < ($count - 1); $firstLine++) {
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$secondLine = $count - $firstLine;
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$key = "$firstLine&$secondLine";
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$tries[$key] = [
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$this->calculateMultiThumbsHeight(array_slice($ratiosCropped, 0, $firstLine), $maxWidth, $marginWidth),
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$this->calculateMultiThumbsHeight(array_slice($ratiosCropped, $firstLine), $maxWidth, $marginWidth),
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];
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}
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# Try three lines:
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for($firstLine = 1; $firstLine < ($count - 2); $firstLine++) {
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for($secondLine = 1; $secondLine < ($count - $firstLine - 1); $secondLine++) {
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$thirdLine = $count - $firstLine - $secondLine;
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$key = "$firstLine&$secondLine&$thirdLine";
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$tries[$key] = [
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$this->calculateMultiThumbsHeight(array_slice($ratiosCropped, 0, $firstLine), $maxWidth, $marginWidth),
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$this->calculateMultiThumbsHeight($this->extractSubArr($ratiosCropped, $firstLine, $firstLine + $secondLine), $maxWidth, $marginWidth),
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$this->calculateMultiThumbsHeight($this->extractSubArr($ratiosCropped, $firstLine + $secondLine, sizeof($ratiosCropped)), $maxWidth, $marginWidth),
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];
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}
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}
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# Now let's find the most optimal configuration:
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$optimalConfiguration = $optimalDifference = NULL;
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foreach($tries as $config => $heights) {
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$config = explode('&', (string) $config); # да да стринговые ключи пхп даже со стриктайпами автокастует к инту (см. 187)
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$confH = $marginHeight * (sizeof($heights) - 1);
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foreach($heights as $h)
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$confH += $h;
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$confDiff = abs($confH - $maxHeight);
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if(sizeof($config) > 1)
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if($config[0] > $config[1] || sizeof($config) >= 2 && $config[1] > $config[2])
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$confDiff *= 1.1;
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if(!$optimalConfiguration || $confDigff < $optimalDifference) {
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$optimalConfiguration = $config;
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$optimalDifference = $confDiff;
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}
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}
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$thumbsRemain = $this->photos;
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$ratiosRemain = $ratiosCropped;
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$optHeights = $tries[implode('&', $optimalConfiguration)];
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$k = 0;
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$result->width = ceil($maxWidth);
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$result->rowSizes = [sizeof($optHeights)];
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$result->tiles = [];
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$totalHeight = 0.0;
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$gridLineOffsets = [];
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$rowTiles = []; // vector<vector<ThumbTile>>
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for($i = 0; $i < sizeof($optimalConfiguration); $i++) {
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$lineChunksNum = $optimalConfiguration[$i];
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$lineThumbs = [];
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for($j = 0; $j < $lineChunksNum; $j++)
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$lineThumbs[] = array_shift($thumbsRemain);
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$lineHeight = $optHeights[$i];
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$totalHeight += $lineHeight;
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$result->rowSizes[$i] = ceil($lineHeight);
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$totalWidth = 0;
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$row = [];
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for($j = 0; $j < sizeof($lineThumbs); $j++) {
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$thumbRatio = array_shift($ratiosRemain);
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if($j == sizeof($lineThumbs) - 1)
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$w = $maxWidth - $totalWidth;
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else
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$w = $thumbRatio * $lineHeight;
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$totalWidth += ceil($w);
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if($j < (sizeof($lineThumbs) - 1) && !in_array($totalWidth, $gridLineOffsets))
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$gridLineOffsets[] = $totalWidth;
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$tile = new ThumbTile(1, 1, $w, $lineHeight);
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$result->tiles[$k++] = $row[] = $tile;
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}
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$rowTiles[] = $row;
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}
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sort($gridLineOffsets, SORT_NUMERIC);
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$gridLineOffsets[] = $maxWidth;
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$result->colSizes = [$gridLineOffsets[0]];
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for($i = sizeof($gridLineOffsets) - 1; $i > 0; $i--)
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$result->colSizes[$i] = $gridLineOffsets[$i] - $gridLineOffsets[$i - 1];
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foreach($rowTiles as $row) {
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$columnOffset = 0;
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foreach($row as $tile) {
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$startColumn = $columnOffset;
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$width = 0;
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$tile->colSpan = 0;
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for($i = $startColumn; $i < sizeof($result->colSizes); $i++) {
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$width += $result->colSizes[$i];
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$tile->colSpan++;
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if($width == $tile->width)
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break;
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}
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$columnOffset += $tile->colSpan;
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}
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}
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$result->height = ceil($totalHeight + $marginHeight * (sizeof($optHeights) - 1));
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break;
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}
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return $result;
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}
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}
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