Viewing file:  GIS_Geometry.class.php (12.24 KB) -rw-r--r--
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Base class for all GIS data type classes
*
* @package PhpMyAdmin-GIS
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* Base class for all GIS data type classes.
*
* @package PhpMyAdmin-GIS
*/
abstract class PMA_GIS_Geometry
{
/**
* Prepares and returns the code related to a row in the GIS dataset as SVG.
*
* @param string $spatial GIS data object
* @param string $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data data related to scaling
*
* @return string the code related to a row in the GIS dataset
* @access public
*/
public abstract function prepareRowAsSvg($spatial, $label, $color, $scale_data);
/**
* Adds to the PNG image object, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS data object
* @param string $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data array containing data related to scaling
* @param object $image image object
*
* @return object the modified image object
* @access public
*/
public abstract function prepareRowAsPng($spatial, $label, $color,
$scale_data, $image
);
/**
* Adds to the TCPDF instance, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS data object
* @param string $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data array containing data related to scaling
* @param TCPDF $pdf TCPDF instance
*
* @return TCPDF the modified TCPDF instance
* @access public
*/
public abstract function prepareRowAsPdf($spatial, $label, $color,
$scale_data, $pdf
);
/**
* Prepares the JavaScript related to a row in the GIS dataset
* to visualize it with OpenLayers.
*
* @param string $spatial GIS data object
* @param int $srid spatial reference ID
* @param string $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data array containing data related to scaling
*
* @return string the JavaScript related to a row in the GIS dataset
* @access public
*/
public abstract function prepareRowAsOl($spatial, $srid, $label,
$color, $scale_data
);
/**
* Scales each row.
*
* @param string $spatial spatial data of a row
*
* @return array array containing the min, max values for x and y coordinates
* @access public
*/
public abstract function scaleRow($spatial);
/**
* Generates the WKT with the set of parameters passed by the GIS editor.
*
* @param array $gis_data GIS data
* @param int $index index into the parameter object
* @param string $empty value for empty points
*
* @return string WKT with the set of parameters passed by the GIS editor
* @access public
*/
public abstract function generateWkt($gis_data, $index, $empty = '');
/**
* Returns OpenLayers.Bounds object that correspond to the bounds of GIS data.
*
* @param string $srid spatial reference ID
* @param array $scale_data data related to scaling
*
* @return string OpenLayers.Bounds object that
* correspond to the bounds of GIS data
* @access protected
*/
protected function getBoundsForOl($srid, $scale_data)
{
return 'bound = new OpenLayers.Bounds(); '
. 'bound.extend(new OpenLayers.LonLat('
. $scale_data['minX'] . ', ' . $scale_data['minY']
. ').transform(new OpenLayers.Projection("EPSG:'
. $srid . '"), map.getProjectionObject())); '
. 'bound.extend(new OpenLayers.LonLat('
. $scale_data['maxX'] . ', ' . $scale_data['maxY']
. ').transform(new OpenLayers.Projection("EPSG:'
. $srid . '"), map.getProjectionObject()));';
}
/**
* Updates the min, max values with the given point set.
*
* @param string $point_set point set
* @param array $min_max existing min, max values
*
* @return array the updated min, max values
* @access protected
*/
protected function setMinMax($point_set, $min_max)
{
// Separate each point
$points = explode(",", $point_set);
foreach ($points as $point) {
// Extract coordinates of the point
$cordinates = explode(" ", $point);
$x = (float) $cordinates[0];
if (! isset($min_max['maxX']) || $x > $min_max['maxX']) {
$min_max['maxX'] = $x;
}
if (! isset($min_max['minX']) || $x < $min_max['minX']) {
$min_max['minX'] = $x;
}
$y = (float) $cordinates[1];
if (! isset($min_max['maxY']) || $y > $min_max['maxY']) {
$min_max['maxY'] = $y;
}
if (! isset($min_max['minY']) || $y < $min_max['minY']) {
$min_max['minY'] = $y;
}
}
return $min_max;
}
/**
* Generates parameters for the GIS data editor from the value of the GIS column.
* This method performs common work.
* More specific work is performed by each of the geom classes.
*
* @param string $value value of the GIS column
*
* @return array parameters for the GIS editor from the value of the GIS column
* @access protected
*/
protected function generateParams($value)
{
$geom_types = '(POINT|MULTIPOINT|LINESTRING|MULTILINESTRING'
. '|POLYGON|MULTIPOLYGON|GEOMETRYCOLLECTION)';
$srid = 0;
$wkt = '';
if (preg_match("/^'" . $geom_types . "\(.*\)',[0-9]*$/i", $value)) {
$last_comma = /*overload*/mb_strripos($value, ",");
$srid = trim(/*overload*/mb_substr($value, $last_comma + 1));
$wkt = trim(/*overload*/mb_substr($value, 1, $last_comma - 2));
} elseif (preg_match("/^" . $geom_types . "\(.*\)$/i", $value)) {
$wkt = $value;
}
return array('srid' => $srid, 'wkt' => $wkt);
}
/**
* Extracts points, scales and returns them as an array.
*
* @param string $point_set string of comma separated points
* @param array $scale_data data related to scaling
* @param boolean $linear if true, as a 1D array, else as a 2D array
*
* @return array scaled points
* @access protected
*/
protected function extractPoints($point_set, $scale_data, $linear = false)
{
$points_arr = array();
// Separate each point
$points = explode(",", $point_set);
foreach ($points as $point) {
// Extract coordinates of the point
$cordinates = explode(" ", $point);
if (isset($cordinates[0]) && trim($cordinates[0]) != ''
&& isset($cordinates[1]) && trim($cordinates[1]) != ''
) {
if ($scale_data != null) {
$x = ($cordinates[0] - $scale_data['x']) * $scale_data['scale'];
$y = $scale_data['height']
- ($cordinates[1] - $scale_data['y']) * $scale_data['scale'];
} else {
$x = trim($cordinates[0]);
$y = trim($cordinates[1]);
}
} else {
$x = '';
$y = '';
}
if (! $linear) {
$points_arr[] = array($x, $y);
} else {
$points_arr[] = $x;
$points_arr[] = $y;
}
}
return $points_arr;
}
/**
* Generates JavaScript for adding an array of polygons to OpenLayers.
*
* @param array $polygons x and y coordinates for each polygon
* @param string $srid spatial reference id
*
* @return string JavaScript for adding an array of polygons to OpenLayers
* @access protected
*/
protected function getPolygonArrayForOpenLayers($polygons, $srid)
{
$ol_array = 'new Array(';
foreach ($polygons as $polygon) {
$rings = explode("),(", $polygon);
$ol_array .= $this->getPolygonForOpenLayers($rings, $srid) . ', ';
}
$ol_array = /*overload*/mb_substr(
$ol_array,
0,
/*overload*/mb_strlen($ol_array) - 2
);
$ol_array .= ')';
return $ol_array;
}
/**
* Generates JavaScript for adding points for OpenLayers polygon.
*
* @param array $polygon x and y coordinates for each line
* @param string $srid spatial reference id
*
* @return string JavaScript for adding points for OpenLayers polygon
* @access protected
*/
protected function getPolygonForOpenLayers($polygon, $srid)
{
return 'new OpenLayers.Geometry.Polygon('
. $this->getLineArrayForOpenLayers($polygon, $srid, false)
. ')';
}
/**
* Generates JavaScript for adding an array of LineString
* or LineRing to OpenLayers.
*
* @param array $lines x and y coordinates for each line
* @param string $srid spatial reference id
* @param bool $is_line_string whether it's an array of LineString
*
* @return string JavaScript for adding an array of LineString
* or LineRing to OpenLayers
* @access protected
*/
protected function getLineArrayForOpenLayers($lines, $srid,
$is_line_string = true
) {
$ol_array = 'new Array(';
foreach ($lines as $line) {
$points_arr = $this->extractPoints($line, null);
$ol_array .= $this->getLineForOpenLayers(
$points_arr, $srid, $is_line_string
);
$ol_array .= ', ';
}
$ol_array = /*overload*/mb_substr(
$ol_array,
0,
/*overload*/mb_strlen($ol_array) - 2
);
$ol_array .= ')';
return $ol_array;
}
/**
* Generates JavaScript for adding a LineString or LineRing to OpenLayers.
*
* @param array $points_arr x and y coordinates for each point
* @param string $srid spatial reference id
* @param bool $is_line_string whether it's a LineString
*
* @return string JavaScript for adding a LineString or LineRing to OpenLayers
* @access protected
*/
protected function getLineForOpenLayers($points_arr, $srid,
$is_line_string = true
) {
return 'new OpenLayers.Geometry.'
. ($is_line_string ? 'LineString' : 'LinearRing') . '('
. $this->getPointsArrayForOpenLayers($points_arr, $srid)
. ')';
}
/**
* Generates JavaScript for adding an array of points to OpenLayers.
*
* @param array $points_arr x and y coordinates for each point
* @param string $srid spatial reference id
*
* @return string JavaScript for adding an array of points to OpenLayers
* @access protected
*/
protected function getPointsArrayForOpenLayers($points_arr, $srid)
{
$ol_array = 'new Array(';
foreach ($points_arr as $point) {
$ol_array .= $this->getPointForOpenLayers($point, $srid) . ', ';
}
$ol_array = /*overload*/mb_substr(
$ol_array,
0,
/*overload*/mb_strlen($ol_array) - 2
);
$ol_array .= ')';
return $ol_array;
}
/**
* Generates JavaScript for adding a point to OpenLayers.
*
* @param array $point array containing the x and y coordinates of the point
* @param string $srid spatial reference id
*
* @return string JavaScript for adding points to OpenLayers
* @access protected
*/
protected function getPointForOpenLayers($point, $srid)
{
return '(new OpenLayers.Geometry.Point(' . $point[0] . ',' . $point[1] . '))'
. '.transform(new OpenLayers.Projection("EPSG:'
. $srid . '"), map.getProjectionObject())';
}
}
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