Viewing file:  GisVisualization.php (20.57 KB) -rw-r--r--
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Handles visualization of GIS data
*
* @package PhpMyAdmin-GIS
*/
namespace PhpMyAdmin\Gis;
use PhpMyAdmin\Core;
use PhpMyAdmin\Sanitize;
use PhpMyAdmin\Util;
use TCPDF;
/**
* Handles visualization of GIS data
*
* @package PhpMyAdmin-GIS
*/
class GisVisualization
{
/**
* @var array Raw data for the visualization
*/
private $_data;
private $_modified_sql;
/**
* @var array Set of default settings values are here.
*/
private $_settings = array(
// Array of colors to be used for GIS visualizations.
'colors' => array(
'#B02EE0',
'#E0642E',
'#E0D62E',
'#2E97E0',
'#BCE02E',
'#E02E75',
'#5CE02E',
'#E0B02E',
'#0022E0',
'#726CB1',
'#481A36',
'#BAC658',
'#127224',
'#825119',
'#238C74',
'#4C489B',
'#87C9BF',
),
// The width of the GIS visualization.
'width' => 600,
// The height of the GIS visualization.
'height' => 450,
);
/**
* @var array Options that the user has specified.
*/
private $_userSpecifiedSettings = null;
/**
* Returns the settings array
*
* @return array the settings array
* @access public
*/
public function getSettings()
{
return $this->_settings;
}
/**
* Factory
*
* @param string $sql_query SQL to fetch raw data for visualization
* @param array $options Users specified options
* @param integer $row number of rows
* @param integer $pos start position
*
* @return GisVisualization
*
* @access public
*/
public static function get($sql_query, array $options, $row, $pos)
{
return new GisVisualization($sql_query, $options, $row, $pos);
}
/**
* Get visualization
*
* @param array $data Raw data, if set, parameters other than $options will be
* ignored
* @param array $options Users specified options
*
* @return GisVisualization
*/
public static function getByData(array $data, array $options)
{
return new GisVisualization(null, $options, null, null, $data);
}
/**
* Check if data has SRID
*
* @return bool
*/
public function hasSrid()
{
foreach ($this->_data as $row) {
if ($row['srid'] != 0) {
return true;
}
}
return false;
}
/**
* Constructor. Stores user specified options.
*
* @param string $sql_query SQL to fetch raw data for visualization
* @param array $options Users specified options
* @param integer $row number of rows
* @param integer $pos start position
* @param array|null $data raw data. If set, parameters other than $options
* will be ignored
*
* @access public
*/
private function __construct($sql_query, array $options, $row, $pos, $data = null)
{
$this->_userSpecifiedSettings = $options;
if (isset($data)) {
$this->_data = $data;
} else {
$this->_modified_sql = $this->_modifySqlQuery($sql_query, $row, $pos);
$this->_data = $this->_fetchRawData();
}
}
/**
* All the variable initialization, options handling has to be done here.
*
* @return void
* @access protected
*/
protected function init()
{
$this->_handleOptions();
}
/**
* Returns sql for fetching raw data
*
* @param string $sql_query The SQL to modify.
* @param integer $rows Number of rows.
* @param integer $pos Start position.
*
* @return string the modified sql query.
*/
private function _modifySqlQuery($sql_query, $rows, $pos)
{
$modified_query = 'SELECT ';
$spatialAsText = 'ASTEXT';
$spatialSrid = 'SRID';
if ($this->_userSpecifiedSettings['mysqlVersion'] >= 50600) {
$spatialAsText = 'ST_ASTEXT';
$spatialSrid = 'ST_SRID';
}
// If label column is chosen add it to the query
if (!empty($this->_userSpecifiedSettings['labelColumn'])) {
$modified_query .= Util::backquote(
$this->_userSpecifiedSettings['labelColumn']
)
. ', ';
}
// Wrap the spatial column with 'ST_ASTEXT()' function and add it
$modified_query .= $spatialAsText . '('
. Util::backquote($this->_userSpecifiedSettings['spatialColumn'])
. ') AS ' . Util::backquote(
$this->_userSpecifiedSettings['spatialColumn']
)
. ', ';
// Get the SRID
$modified_query .= $spatialSrid . '('
. Util::backquote($this->_userSpecifiedSettings['spatialColumn'])
. ') AS ' . Util::backquote('srid') . ' ';
// Append the original query as the inner query
$modified_query .= 'FROM (' . $sql_query . ') AS '
. Util::backquote('temp_gis');
// LIMIT clause
if (is_numeric($rows) && $rows > 0) {
$modified_query .= ' LIMIT ';
if (is_numeric($pos) && $pos >= 0) {
$modified_query .= $pos . ', ' . $rows;
} else {
$modified_query .= $rows;
}
}
return $modified_query;
}
/**
* Returns raw data for GIS visualization.
*
* @return string the raw data.
*/
private function _fetchRawData()
{
$modified_result = $GLOBALS['dbi']->tryQuery($this->_modified_sql);
if ($modified_result === false) {
return array();
}
$data = array();
while ($row = $GLOBALS['dbi']->fetchAssoc($modified_result)) {
$data[] = $row;
}
return $data;
}
/**
* A function which handles passed parameters. Useful if desired
* chart needs to be a little bit different from the default one.
*
* @return void
* @access private
*/
private function _handleOptions()
{
if (!is_null($this->_userSpecifiedSettings)) {
$this->_settings = array_merge(
$this->_settings,
$this->_userSpecifiedSettings
);
}
}
/**
* Sanitizes the file name.
*
* @param string $file_name file name
* @param string $ext extension of the file
*
* @return string the sanitized file name
* @access private
*/
private function _sanitizeName($file_name, $ext)
{
$file_name = Sanitize::sanitizeFilename($file_name);
// Check if the user already added extension;
// get the substring where the extension would be if it was included
$extension_start_pos = mb_strlen($file_name) - mb_strlen($ext) - 1;
$user_extension
= mb_substr(
$file_name,
$extension_start_pos,
mb_strlen($file_name)
);
$required_extension = "." . $ext;
if (mb_strtolower($user_extension) != $required_extension) {
$file_name .= $required_extension;
}
return $file_name;
}
/**
* Handles common tasks of writing the visualization to file for various formats.
*
* @param string $file_name file name
* @param string $type mime type
* @param string $ext extension of the file
*
* @return void
* @access private
*/
private function _toFile($file_name, $type, $ext)
{
$file_name = $this->_sanitizeName($file_name, $ext);
Core::downloadHeader($file_name, $type);
}
/**
* Generate the visualization in SVG format.
*
* @return string the generated image resource
* @access private
*/
private function _svg()
{
$this->init();
$output = '<?xml version="1.0" encoding="UTF-8" standalone="no"?' . ' >'
. "\n"
. '<svg version="1.1" xmlns:svg="http://www.w3.org/2000/svg"'
. ' xmlns="http://www.w3.org/2000/svg"'
. ' width="' . intval($this->_settings['width']) . '"'
. ' height="' . intval($this->_settings['height']) . '">'
. '<g id="groupPanel">';
$scale_data = $this->_scaleDataSet($this->_data);
$output .= $this->_prepareDataSet($this->_data, $scale_data, 'svg', '');
$output .= '</g></svg>';
return $output;
}
/**
* Get the visualization as a SVG.
*
* @return string the visualization as a SVG
* @access public
*/
public function asSVG()
{
$output = $this->_svg();
return $output;
}
/**
* Saves as a SVG image to a file.
*
* @param string $file_name File name
*
* @return void
* @access public
*/
public function toFileAsSvg($file_name)
{
$img = $this->_svg();
$this->_toFile($file_name, 'image/svg+xml', 'svg');
echo($img);
}
/**
* Generate the visualization in PNG format.
*
* @return resource the generated image resource
* @access private
*/
private function _png()
{
$this->init();
// create image
$image = imagecreatetruecolor(
$this->_settings['width'],
$this->_settings['height']
);
// fill the background
$bg = imagecolorallocate($image, 229, 229, 229);
imagefilledrectangle(
$image,
0,
0,
$this->_settings['width'] - 1,
$this->_settings['height'] - 1,
$bg
);
$scale_data = $this->_scaleDataSet($this->_data);
$image = $this->_prepareDataSet($this->_data, $scale_data, 'png', $image);
return $image;
}
/**
* Get the visualization as a PNG.
*
* @return string the visualization as a PNG
* @access public
*/
public function asPng()
{
$img = $this->_png();
// render and save it to variable
ob_start();
imagepng($img, null, 9, PNG_ALL_FILTERS);
imagedestroy($img);
$output = ob_get_contents();
ob_end_clean();
// base64 encode
$encoded = base64_encode($output);
return '<img src="data:image/png;base64,' . $encoded . '" />';
}
/**
* Saves as a PNG image to a file.
*
* @param string $file_name File name
*
* @return void
* @access public
*/
public function toFileAsPng($file_name)
{
$img = $this->_png();
$this->_toFile($file_name, 'image/png', 'png');
imagepng($img, null, 9, PNG_ALL_FILTERS);
imagedestroy($img);
}
/**
* Get the code for visualization with OpenLayers.
*
* @todo Should return JSON to avoid eval() in gis_data_editor.js
*
* @return string the code for visualization with OpenLayers
* @access public
*/
public function asOl()
{
$this->init();
$scale_data = $this->_scaleDataSet($this->_data);
$output
= 'if (typeof OpenLayers !== "undefined") {'
. 'var options = {'
. 'projection: new OpenLayers.Projection("EPSG:900913"),'
. 'displayProjection: new OpenLayers.Projection("EPSG:4326"),'
. 'units: "m",'
. 'numZoomLevels: 18,'
. 'maxResolution: 156543.0339,'
. 'maxExtent: new OpenLayers.Bounds('
. '-20037508, -20037508, 20037508, 20037508),'
. 'restrictedExtent: new OpenLayers.Bounds('
. '-20037508, -20037508, 20037508, 20037508)'
. '};'
. 'var map = new OpenLayers.Map("openlayersmap", options);'
. 'var layerNone = new OpenLayers.Layer.Boxes('
. '"None", {isBaseLayer: true});'
. 'var layerOSM = new OpenLayers.Layer.OSM("OSM",'
. '['
. '"https://a.tile.openstreetmap.org/${z}/${x}/${y}.png",'
. '"https://b.tile.openstreetmap.org/${z}/${x}/${y}.png",'
. '"https://c.tile.openstreetmap.org/${z}/${x}/${y}.png"'
. ']);'
. 'map.addLayers([layerOSM,layerNone]);'
. 'var vectorLayer = new OpenLayers.Layer.Vector("Data");'
. 'var bound;';
$output .= $this->_prepareDataSet($this->_data, $scale_data, 'ol', '');
$output .= 'map.addLayer(vectorLayer);'
. 'map.zoomToExtent(bound);'
. 'if (map.getZoom() < 2) {'
. 'map.zoomTo(2);'
. '}'
. 'map.addControl(new OpenLayers.Control.LayerSwitcher());'
. 'map.addControl(new OpenLayers.Control.MousePosition());'
. '}';
return $output;
}
/**
* Saves as a PDF to a file.
*
* @param string $file_name File name
*
* @return void
* @access public
*/
public function toFileAsPdf($file_name)
{
$this->init();
// create pdf
$pdf = new TCPDF(
'', 'pt', $GLOBALS['cfg']['PDFDefaultPageSize'], true, 'UTF-8', false
);
// disable header and footer
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
//set auto page breaks
$pdf->SetAutoPageBreak(false);
// add a page
$pdf->AddPage();
$scale_data = $this->_scaleDataSet($this->_data);
$pdf = $this->_prepareDataSet($this->_data, $scale_data, 'pdf', $pdf);
// sanitize file name
$file_name = $this->_sanitizeName($file_name, 'pdf');
$pdf->Output($file_name, 'D');
}
/**
* Convert file to image
*
* @param string $format Output format
*
* @return string File
*/
public function toImage($format)
{
if ($format == 'svg') {
return $this->asSvg();
} elseif ($format == 'png') {
return $this->asPng();
} elseif ($format == 'ol') {
return $this->asOl();
}
}
/**
* Convert file to given format
*
* @param string $filename Filename
* @param string $format Output format
*
* @return void
*/
public function toFile($filename, $format)
{
if ($format == 'svg') {
$this->toFileAsSvg($filename);
} elseif ($format == 'png') {
$this->toFileAsPng($filename);
} elseif ($format == 'pdf') {
$this->toFileAsPdf($filename);
}
}
/**
* Calculates the scale, horizontal and vertical offset that should be used.
*
* @param array $data Row data
*
* @return array an array containing the scale, x and y offsets
* @access private
*/
private function _scaleDataSet(array $data)
{
$min_max = array(
'maxX' => 0.0,
'maxY' => 0.0,
'minX' => 0.0,
'minY' => 0.0
);
$border = 15;
// effective width and height of the plot
$plot_width = $this->_settings['width'] - 2 * $border;
$plot_height = $this->_settings['height'] - 2 * $border;
foreach ($data as $row) {
// Figure out the data type
$ref_data = $row[$this->_settings['spatialColumn']];
$type_pos = mb_strpos($ref_data, '(');
if ($type_pos === false) {
continue;
}
$type = mb_substr($ref_data, 0, $type_pos);
$gis_obj = GisFactory::factory($type);
if (!$gis_obj) {
continue;
}
$scale_data = $gis_obj->scaleRow(
$row[$this->_settings['spatialColumn']]
);
// Update minimum/maximum values for x and y coordinates.
$c_maxX = (float)$scale_data['maxX'];
if ($min_max['maxX'] === 0.0 || $c_maxX > $min_max['maxX']) {
$min_max['maxX'] = $c_maxX;
}
$c_minX = (float)$scale_data['minX'];
if ($min_max['minX'] === 0.0 || $c_minX < $min_max['minX']) {
$min_max['minX'] = $c_minX;
}
$c_maxY = (float)$scale_data['maxY'];
if ($min_max['maxY'] === 0.0 || $c_maxY > $min_max['maxY']) {
$min_max['maxY'] = $c_maxY;
}
$c_minY = (float)$scale_data['minY'];
if ($min_max['minY'] === 0.0 || $c_minY < $min_max['minY']) {
$min_max['minY'] = $c_minY;
}
}
// scale the visualization
$x_ratio = ($min_max['maxX'] - $min_max['minX']) / $plot_width;
$y_ratio = ($min_max['maxY'] - $min_max['minY']) / $plot_height;
$ratio = ($x_ratio > $y_ratio) ? $x_ratio : $y_ratio;
$scale = ($ratio != 0) ? (1 / $ratio) : 1;
if ($x_ratio < $y_ratio) {
// center horizontally
$x = ($min_max['maxX'] + $min_max['minX'] - $plot_width / $scale) / 2;
// fit vertically
$y = $min_max['minY'] - ($border / $scale);
} else {
// fit horizontally
$x = $min_max['minX'] - ($border / $scale);
// center vertically
$y = ($min_max['maxY'] + $min_max['minY'] - $plot_height / $scale) / 2;
}
return array(
'scale' => $scale,
'x' => $x,
'y' => $y,
'minX' => $min_max['minX'],
'maxX' => $min_max['maxX'],
'minY' => $min_max['minY'],
'maxY' => $min_max['maxY'],
'height' => $this->_settings['height'],
);
}
/**
* Prepares and return the dataset as needed by the visualization.
*
* @param array $data Raw data
* @param array $scale_data Data related to scaling
* @param string $format Format of the visualization
* @param object $results Image object in the case of png
* TCPDF object in the case of pdf
*
* @return mixed the formatted array of data
* @access private
*/
private function _prepareDataSet(array $data, array $scale_data, $format, $results)
{
$color_number = 0;
// loop through the rows
foreach ($data as $row) {
$index = $color_number % sizeof($this->_settings['colors']);
// Figure out the data type
$ref_data = $row[$this->_settings['spatialColumn']];
$type_pos = mb_strpos($ref_data, '(');
if ($type_pos === false) {
continue;
}
$type = mb_substr($ref_data, 0, $type_pos);
$gis_obj = GisFactory::factory($type);
if (!$gis_obj) {
continue;
}
$label = '';
if (isset($this->_settings['labelColumn'])
&& isset($row[$this->_settings['labelColumn']])
) {
$label = $row[$this->_settings['labelColumn']];
}
if ($format == 'svg') {
$results .= $gis_obj->prepareRowAsSvg(
$row[$this->_settings['spatialColumn']],
$label,
$this->_settings['colors'][$index],
$scale_data
);
} elseif ($format == 'png') {
$results = $gis_obj->prepareRowAsPng(
$row[$this->_settings['spatialColumn']],
$label,
$this->_settings['colors'][$index],
$scale_data,
$results
);
} elseif ($format == 'pdf') {
$results = $gis_obj->prepareRowAsPdf(
$row[$this->_settings['spatialColumn']],
$label,
$this->_settings['colors'][$index],
$scale_data,
$results
);
} elseif ($format == 'ol') {
$results .= $gis_obj->prepareRowAsOl(
$row[$this->_settings['spatialColumn']],
$row['srid'],
$label,
$this->_settings['colors'][$index],
$scale_data
);
}
$color_number++;
}
return $results;
}
/**
* Set user specified settings
*
* @param array $userSpecifiedSettings User specified settings
*
* @return void
*/
public function setUserSpecifiedSettings(array $userSpecifiedSettings)
{
$this->_userSpecifiedSettings = $userSpecifiedSettings;
}
}
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