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<?php
/**
* Generates the JavaScripts needed to visualize GIS data.
*
* @package PhpMyAdmin-GIS
*/
class PMA_GIS_Visualization
{
/**
* @var array Raw data for the visualization
*/
private $_data;
/**
* @var array Set of default settigs 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 the settings array.
*/
public function getSettings()
{
return $this->_settings;
}
/**
* Constructor. Stores user specified options.
*
* @param array $data Data for the visualization
* @param array $options Users specified options
*/
public function __construct($data, $options)
{
$this->_userSpecifiedSettings = $options;
$this->_data = $data;
}
/**
* All the variable initialization, options handling has to be done here.
*
* @return nothing
*/
protected function init()
{
$this->_handleOptions();
}
/**
* A function which handles passed parameters. Useful if desired
* chart needs to be a little bit different from the default one.
*
* @return nothing
*/
private function _handleOptions()
{
if (! is_null($this->_userSpecifiedSettings)) {
$this->_settings = array_merge($this->_settings, $this->_userSpecifiedSettings);
}
}
/**
* Sanitizes the file name.
*
* @param string $file_name file name
* @param string $ext extension of the file
*
* @return the sanitized file name
*/
private function _sanitizeName($file_name, $ext)
{
$file_name = PMA_sanitize_filename($file_name);
// Check if the user already added extension;
// get the substring where the extension would be if it was included
$extension_start_pos = strlen($file_name) - strlen($ext) - 1;
$user_extension = substr($file_name, $extension_start_pos, strlen($file_name));
$required_extension = "." . $ext;
if (strtolower($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 $ext extension of the file
*
* @return nothing
*/
private function _toFile($file_name, $type, $ext)
{
$file_name = $this->_sanitizeName($file_name, $ext);
ob_clean();
PMA_download_header($file_name, $type);
}
/**
* Generate the visualization in SVG format.
*
* @return the generated image resource
*/
private function _svg()
{
$this->init();
$output = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . "\n";
$output .= '<svg version="1.1" xmlns:svg="http://www.w3.org/2000/svg"'
. ' xmlns="http://www.w3.org/2000/svg" width="' . $this->_settings['width'] . '"'
. ' height="' . $this->_settings['height'] . '">';
$output .= '<g id="groupPanel">';
$scale_data = $this->_scaleDataSet($this->_data);
$output .= $this->_prepareDataSet($this->_data, $scale_data, 'svg', '');
$output .= '</g>';
$output .= '</svg>';
return $output;
}
/**
* Get the visualization as a SVG.
*
* @return the visualization as a SVG
*/
public function asSVG()
{
$output = $this->_svg();
return $output;
}
/**
* Saves as a SVG image to a file.
*
* @param string $file_name File name
*
* @return nothing
*/
public function toFileAsSvg($file_name)
{
$img = $this->_svg();
$this->_toFile($file_name, 'image/svg+xml', 'svg');
echo($img);
}
/**
* Generate the visualization in PNG format.
*
* @return the generated image resource
*/
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 the visualization as a PNG
*/
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 $file_name File name
*
* @return nothing
*/
public function toFileAsPng($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.
*
* @return the code for visualization with OpenLayers
*/
public function asOl()
{
$this->init();
$scale_data = $this->_scaleDataSet($this->_data);
$output
= '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 layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");'
. 'var layerOsmarender = new OpenLayers.Layer.OSM.Osmarender("Osmarender");'
. 'var layerCycleMap = new OpenLayers.Layer.OSM.CycleMap("CycleMap");'
. 'map.addLayers([layerMapnik, layerOsmarender, layerCycleMap, 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 $file_name File name
*
* @return nothing
*/
public function toFileAsPdf($file_name)
{
$this->init();
include_once './libraries/tcpdf/tcpdf.php';
// 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');
ob_clean();
$pdf->Output($file_name, 'D');
}
/**
* Calculates the scale, horizontal and vertical offset that should be used.
*
* @param array $data Row data
*
* @return an array containing the scale, x and y offsets
*/
private function _scaleDataSet($data)
{
$min_max = array();
$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']];
$type_pos = stripos($ref_data, '(');
$type = substr($ref_data, 0, $type_pos);
$gis_obj = PMA_GIS_Factory::factory($type);
if (! $gis_obj) {
continue;
}
$scale_data = $gis_obj->scaleRow($row[$this->_settings['spatialColumn']]);
// Upadate minimum/maximum values for x and y cordinates.
$c_maxX = (float) $scale_data['maxX'];
if (! isset($min_max['maxX']) || $c_maxX > $min_max['maxX']) {
$min_max['maxX'] = $c_maxX;
}
$c_minX = (float) $scale_data['minX'];
if (! isset($min_max['minX']) || $c_minX < $min_max['minX']) {
$min_max['minX'] = $c_minX;
}
$c_maxY = (float) $scale_data['maxY'];
if (! isset($min_max['maxY']) || $c_maxY > $min_max['maxY']) {
$min_max['maxY'] = $c_maxY;
}
$c_minY = (float) $scale_data['minY'];
if (! isset($min_max['minY']) || $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 visulaization
* @param image $results Image object in the case of png
*
* @return the formatted array of data.
*/
private function _prepareDataSet($data, $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']];
$type_pos = stripos($ref_data, '(');
$type = substr($ref_data, 0, $type_pos);
$gis_obj = PMA_GIS_Factory::factory($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;
}
}
?>
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