289 lines
8.7 KiB
PHP
289 lines
8.7 KiB
PHP
<?php
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/**
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* Handles actions related to GIS LINESTRING objects
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*/
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declare(strict_types=1);
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namespace PhpMyAdmin\Gis;
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use PhpMyAdmin\Image\ImageWrapper;
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use TCPDF;
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use function count;
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use function json_encode;
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use function mb_substr;
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use function round;
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use function sprintf;
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use function trim;
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/**
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* Handles actions related to GIS LINESTRING objects
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*/
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class GisLineString extends GisGeometry
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{
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private static self $instance;
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/**
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* A private constructor; prevents direct creation of object.
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*/
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private function __construct()
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{
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}
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/**
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* Returns the singleton.
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*
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* @return GisLineString the singleton
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*/
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public static function singleton(): GisLineString
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{
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if (! isset(self::$instance)) {
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self::$instance = new GisLineString();
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}
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return self::$instance;
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}
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/**
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* Scales each row.
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*
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* @param string $spatial spatial data of a row
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*
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* @return ScaleData|null the min, max values for x and y coordinates
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*/
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public function scaleRow(string $spatial): ScaleData|null
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{
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$linestring = mb_substr($spatial, 11, -1);
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return $this->setMinMax($linestring);
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}
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/**
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* Adds to the PNG image object, the data related to a row in the GIS dataset.
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*
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* @param string $spatial GIS POLYGON object
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* @param string $label Label for the GIS POLYGON object
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* @param int[] $color Color for the GIS POLYGON object
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* @param array $scaleData Array containing data related to scaling
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*/
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public function prepareRowAsPng(
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string $spatial,
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string $label,
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array $color,
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array $scaleData,
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ImageWrapper $image,
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): ImageWrapper {
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// allocate colors
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$black = $image->colorAllocate(0, 0, 0);
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$lineColor = $image->colorAllocate(...$color);
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$lineString = mb_substr($spatial, 11, -1);
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$pointsArr = $this->extractPoints1d($lineString, $scaleData);
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foreach ($pointsArr as $point) {
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if (isset($tempPoint)) {
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// draw line section
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$image->line(
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(int) round($tempPoint[0]),
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(int) round($tempPoint[1]),
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(int) round($point[0]),
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(int) round($point[1]),
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$lineColor,
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);
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}
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$tempPoint = $point;
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}
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// print label if applicable
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if ($label !== '') {
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$image->string(
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1,
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(int) round($pointsArr[1][0]),
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(int) round($pointsArr[1][1]),
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$label,
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$black,
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);
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}
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return $image;
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}
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/**
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* Adds to the TCPDF instance, the data related to a row in the GIS dataset.
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*
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* @param string $spatial GIS LINESTRING object
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* @param string $label Label for the GIS LINESTRING object
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* @param int[] $color Color for the GIS LINESTRING object
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* @param array $scaleData Array containing data related to scaling
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*
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* @return TCPDF the modified TCPDF instance
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*/
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public function prepareRowAsPdf(string $spatial, string $label, array $color, array $scaleData, TCPDF $pdf): TCPDF
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{
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$line = [
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'width' => 1.5,
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'color' => $color,
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];
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$linestring = mb_substr($spatial, 11, -1);
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$pointsArr = $this->extractPoints1d($linestring, $scaleData);
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foreach ($pointsArr as $point) {
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if (isset($tempPoint)) {
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// draw line section
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$pdf->Line($tempPoint[0], $tempPoint[1], $point[0], $point[1], $line);
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}
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$tempPoint = $point;
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}
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// print label
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if ($label !== '') {
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$pdf->setXY($pointsArr[1][0], $pointsArr[1][1]);
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$pdf->setFontSize(5);
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$pdf->Cell(0, 0, $label);
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}
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return $pdf;
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}
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/**
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* Prepares and returns the code related to a row in the GIS dataset as SVG.
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*
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* @param string $spatial GIS LINESTRING object
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* @param string $label Label for the GIS LINESTRING object
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* @param int[] $color Color for the GIS LINESTRING object
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* @param array $scaleData Array containing data related to scaling
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*
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* @return string the code related to a row in the GIS dataset
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*/
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public function prepareRowAsSvg(string $spatial, string $label, array $color, array $scaleData): string
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{
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$lineOptions = [
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'name' => $label,
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'id' => $label . $this->getRandomId(),
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'class' => 'linestring vector',
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'fill' => 'none',
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'stroke' => sprintf('#%02x%02x%02x', ...$color),
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'stroke-width' => 2,
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];
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$linestring = mb_substr($spatial, 11, -1);
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$pointsArr = $this->extractPoints1d($linestring, $scaleData);
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$row = '<polyline points="';
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foreach ($pointsArr as $point) {
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$row .= $point[0] . ',' . $point[1] . ' ';
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}
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$row .= '"';
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foreach ($lineOptions as $option => $val) {
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$row .= ' ' . $option . '="' . $val . '"';
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}
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$row .= '/>';
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return $row;
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}
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/**
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* Prepares JavaScript related to a row in the GIS dataset
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* to visualize it with OpenLayers.
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*
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* @param string $spatial GIS LINESTRING object
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* @param int $srid Spatial reference ID
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* @param string $label Label for the GIS LINESTRING object
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* @param int[] $color Color for the GIS LINESTRING object
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*
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* @return string JavaScript related to a row in the GIS dataset
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*/
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public function prepareRowAsOl(string $spatial, int $srid, string $label, array $color): string
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{
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$strokeStyle = [
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'color' => $color,
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'width' => 2,
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];
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$style = 'new ol.style.Style({'
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. 'stroke: new ol.style.Stroke(' . json_encode($strokeStyle) . ')';
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if ($label !== '') {
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$textStyle = ['text' => $label];
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$style .= ', text: new ol.style.Text(' . json_encode($textStyle) . ')';
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}
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$style .= '})';
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$wktCoordinates = mb_substr($spatial, 11, -1);
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$olGeometry = $this->toOpenLayersObject(
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'ol.geom.LineString',
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$this->extractPoints1d($wktCoordinates, null),
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$srid,
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);
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return $this->addGeometryToLayer($olGeometry, $style);
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}
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/**
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* Generate the WKT with the set of parameters passed by the GIS editor.
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*
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* @param array $gisData GIS data
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* @param int $index Index into the parameter object
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* @param string|null $empty Value for empty points
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*
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* @return string WKT with the set of parameters passed by the GIS editor
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*/
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public function generateWkt(array $gisData, int $index, string|null $empty = ''): string
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{
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$noOfPoints = $gisData[$index]['LINESTRING']['no_of_points'] ?? 2;
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if ($noOfPoints < 2) {
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$noOfPoints = 2;
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}
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$wkt = 'LINESTRING(';
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for ($i = 0; $i < $noOfPoints; $i++) {
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$wkt .= (isset($gisData[$index]['LINESTRING'][$i]['x'])
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&& trim((string) $gisData[$index]['LINESTRING'][$i]['x']) != ''
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? $gisData[$index]['LINESTRING'][$i]['x'] : $empty)
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. ' ' . (isset($gisData[$index]['LINESTRING'][$i]['y'])
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&& trim((string) $gisData[$index]['LINESTRING'][$i]['y']) != ''
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? $gisData[$index]['LINESTRING'][$i]['y'] : $empty) . ',';
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}
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$wkt = mb_substr($wkt, 0, -1);
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return $wkt . ')';
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}
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/**
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* Generate coordinate parameters for the GIS data editor from the value of the GIS column.
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*
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* @param string $wkt Value of the GIS column
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*
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* @return array Coordinate params for the GIS data editor from the value of the GIS column
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*/
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protected function getCoordinateParams(string $wkt): array
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{
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// Trim to remove leading 'LINESTRING(' and trailing ')'
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$linestring = mb_substr($wkt, 11, -1);
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$pointsArr = $this->extractPoints1d($linestring, null);
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$noOfPoints = count($pointsArr);
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$coords = ['no_of_points' => $noOfPoints];
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for ($i = 0; $i < $noOfPoints; $i++) {
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$coords[$i] = [
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'x' => $pointsArr[$i][0],
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'y' => $pointsArr[$i][1],
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];
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}
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return $coords;
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}
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}
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