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Chris Sewell
250
html/phpmyad/libraries/gis/pma_gis_geometry.php
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250
html/phpmyad/libraries/gis/pma_gis_geometry.php
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<?php
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/**
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* Base class for all GIS data type classes.
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*
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* @package PhpMyAdmin-GIS
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*/
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abstract class PMA_GIS_Geometry
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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 data object
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* @param string $label Label for the GIS data object
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* @param string $color Color for the GIS data object
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* @param array $scale_data Data related to scaling
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*
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* @return the code related to a row in the GIS dataset
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*/
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public abstract function prepareRowAsSvg($spatial, $label, $color, $scale_data);
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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 data object
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* @param string $label Label for the GIS data object
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* @param string $color Color for the GIS data object
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* @param array $scale_data Array containing data related to scaling
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* @param image $image Image object
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*
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* @return the modified image object
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*/
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public abstract function prepareRowAsPng($spatial, $label, $color, $scale_data, $image);
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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 data object
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* @param string $label Label for the GIS data object
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* @param string $color Color for the GIS data object
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* @param array $scale_data Array containing data related to scaling
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* @param image $pdf TCPDF instance
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*
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* @return the modified TCPDF instance
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*/
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public abstract function prepareRowAsPdf($spatial, $label, $color, $scale_data, $pdf);
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/**
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* Prepares the 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 data object
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* @param int $srid Spatial reference ID
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* @param string $label Label for the GIS data object
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* @param string $color Color for the GIS data object
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* @param array $scale_data Array containing data related to scaling
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*
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* @return the JavaScript related to a row in the GIS dataset
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*/
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public abstract function prepareRowAsOl($spatial, $srid, $label, $color, $scale_data);
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/**
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* Scales each row.
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*
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* @param string $spatial spatial data of a row
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*
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* @return array containing the min, max values for x and y cordinates
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*/
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public abstract function scaleRow($spatial);
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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 $gis_data GIS data
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* @param int $index Index into the parameter object
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* @param string $empty Value for empty points
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*
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* @return WKT with the set of parameters passed by the GIS editor
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*/
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public abstract function generateWkt($gis_data, $index, $empty);
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/**
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* Returns OpenLayers.Bounds object that correspond to the bounds of GIS data.
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*
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* @param string $srid Spatial reference ID
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* @param array $scale_data Data related to scaling
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*
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* @return OpenLayers.Bounds object that correspond to the bounds of GIS data
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*/
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protected function getBoundsForOl($srid, $scale_data)
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{
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return 'bound = new OpenLayers.Bounds(); bound.extend(new OpenLayers.LonLat('
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. $scale_data['minX'] . ', ' . $scale_data['minY']
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. ').transform(new OpenLayers.Projection("EPSG:'
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. $srid . '"), map.getProjectionObject())); bound.extend(new OpenLayers.LonLat('
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. $scale_data['maxX'] . ', ' . $scale_data['maxY']
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. ').transform(new OpenLayers.Projection("EPSG:'
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. $srid . '"), map.getProjectionObject()));';
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}
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/**
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* Update the min, max values with the given point set.
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*
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* @param string $point_set Point set
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* @param array $min_max Existing min, max values
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*
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* @return the updated min, max values
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*/
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protected function setMinMax($point_set, $min_max)
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{
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// Seperate each point
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$points = explode(",", $point_set);
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foreach ($points as $point) {
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// Extract cordinates of the point
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$cordinates = explode(" ", $point);
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$x = (float) $cordinates[0];
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if (! isset($min_max['maxX']) || $x > $min_max['maxX']) {
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$min_max['maxX'] = $x;
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}
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if (! isset($min_max['minX']) || $x < $min_max['minX']) {
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$min_max['minX'] = $x;
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}
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$y = (float) $cordinates[1];
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if (! isset($min_max['maxY']) || $y > $min_max['maxY']) {
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$min_max['maxY'] = $y;
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}
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if (! isset($min_max['minY']) || $y < $min_max['minY']) {
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$min_max['minY'] = $y;
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}
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}
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return $min_max;
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}
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/**
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* Generate parameters for the GIS data editor from the value of the GIS column.
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* This method performs common work.
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* More specific work is performed by each of the geom classes.
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*
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* @param $gis_string $value of the GIS column
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*
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* @return array parameters for the GIS editor from the value of the GIS column
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*/
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protected function generateParams($value)
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{
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$geom_types = '(POINT|MULTIPOINT|LINESTRING|MULTILINESTRING|POLYGON|MULTIPOLYGON|GEOMETRYCOLLECTION)';
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$srid = 0;
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$wkt = '';
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if (preg_match("/^'" . $geom_types . "\(.*\)',[0-9]*$/i", $value)) {
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$last_comma = strripos($value, ",");
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$srid = trim(substr($value, $last_comma + 1));
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$wkt = trim(substr($value, 1, $last_comma - 2));
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} elseif (preg_match("/^" . $geom_types . "\(.*\)$/i", $value)) {
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$wkt = $value;
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}
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return array('srid' => $srid, 'wkt' => $wkt);
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}
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/**
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* Extracts points, scales and returns them as an array.
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*
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* @param string $point_set String of comma sperated points
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* @param array $scale_data Data related to scaling
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* @param boolean $linear If true, as a 1D array, else as a 2D array
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*
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* @return scaled points
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*/
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protected function extractPoints($point_set, $scale_data, $linear = false)
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{
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$points_arr = array();
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// Seperate each point
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$points = explode(",", $point_set);
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foreach ($points as $point) {
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// Extract cordinates of the point
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$cordinates = explode(" ", $point);
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if (isset($cordinates[0]) && trim($cordinates[0]) != ''
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&& isset($cordinates[1]) && trim($cordinates[1]) != ''
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) {
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if ($scale_data != null) {
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$x = ($cordinates[0] - $scale_data['x']) * $scale_data['scale'];
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$y = $scale_data['height'] - ($cordinates[1] - $scale_data['y']) * $scale_data['scale'];
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} else {
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$x = trim($cordinates[0]);
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$y = trim($cordinates[1]);
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}
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} else {
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$x = '';
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$y = '';
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}
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if (! $linear) {
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$points_arr[] = array($x, $y);
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} else {
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$points_arr[] = $x;
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$points_arr[] = $y;
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}
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}
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return $points_arr;
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}
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/**
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* Generates JavaScriipt for adding points for OpenLayers polygon.
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*
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* @param string $polygon points of a polygon in WKT form
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* @param string $srid spatial reference id
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*
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* @return JavaScriipt for adding points for OpenLayers polygon
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*/
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protected function addPointsForOpenLayersPolygon($polygon, $srid)
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{
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$row = 'new OpenLayers.Geometry.Polygon(new Array(';
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// If the polygon doesnt have an inner polygon
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if (strpos($polygon, "),(") === false) {
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$points_arr = $this->extractPoints($polygon, null);
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$row .= 'new OpenLayers.Geometry.LinearRing(new Array(';
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foreach ($points_arr as $point) {
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$row .= '(new OpenLayers.Geometry.Point('
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. $point[0] . ', ' . $point[1] . '))'
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. '.transform(new OpenLayers.Projection("EPSG:'
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. $srid . '"), map.getProjectionObject()), ';
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}
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$row = substr($row, 0, strlen($row) - 2);
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$row .= '))';
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} else {
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// Seperate outer and inner polygons
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$parts = explode("),(", $polygon);
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foreach ($parts as $ring) {
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$points_arr = $this->extractPoints($ring, null);
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$row .= 'new OpenLayers.Geometry.LinearRing(new Array(';
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foreach ($points_arr as $point) {
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$row .= '(new OpenLayers.Geometry.Point('
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. $point[0] . ', ' . $point[1] . '))'
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. '.transform(new OpenLayers.Projection("EPSG:'
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. $srid . '"), map.getProjectionObject()), ';
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}
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$row = substr($row, 0, strlen($row) - 2);
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$row .= ')), ';
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}
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$row = substr($row, 0, strlen($row) - 2);
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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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?>
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