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initial commit
This commit is contained in:
Chris Sewell
511
html/phpmyad/libraries/gis/pma_gis_polygon.php
Normal file
511
html/phpmyad/libraries/gis/pma_gis_polygon.php
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@ -0,0 +1,511 @@
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<?php
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/**
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* Handles the visualization of GIS POLYGON objects.
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*
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* @package PhpMyAdmin-GIS
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*/
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class PMA_GIS_Polygon extends PMA_GIS_Geometry
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{
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// Hold the singleton instance of the class
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private static $_instance;
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/**
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* A private constructor; prevents direct creation of object.
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*/
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private function __construct()
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{
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}
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/**
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* Returns the singleton.
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*
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* @return the singleton
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*/
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public static function singleton()
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{
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if (!isset(self::$_instance)) {
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$class = __CLASS__;
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self::$_instance = new $class;
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}
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return self::$_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 $spatial spatial data of a row
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*
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* @return array containing the min, max values for x and y cordinates
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*/
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public function scaleRow($spatial)
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{
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// Trim to remove leading 'POLYGON((' and trailing '))'
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$polygon = substr($spatial, 9, (strlen($spatial) - 11));
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// If the polygon doesn't have an inner ring, use polygon itself
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if (strpos($polygon, "),(") === false) {
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$ring = $polygon;
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} else {
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// Seperate outer ring and use it to determin min-max
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$parts = explode("),(", $polygon);
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$ring = $parts[0];
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}
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return $this->setMinMax($ring, array());
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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 string $fill_color Color for the GIS POLYGON object
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* @param array $scale_data Array containing data related to scaling
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* @param image $image Image object
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*
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* @return the modified image object
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*/
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public function prepareRowAsPng($spatial, $label, $fill_color, $scale_data, $image)
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{
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// allocate colors
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$black = imagecolorallocate($image, 0, 0, 0);
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$red = hexdec(substr($fill_color, 1, 2));
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$green = hexdec(substr($fill_color, 3, 2));
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$blue = hexdec(substr($fill_color, 4, 2));
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$color = imagecolorallocate($image, $red, $green, $blue);
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// Trim to remove leading 'POLYGON((' and trailing '))'
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$polygon = substr($spatial, 9, (strlen($spatial) - 11));
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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, $scale_data, true);
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} else {
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// Seperate outer and inner polygons
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$parts = explode("),(", $polygon);
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$outer = $parts[0];
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$inner = array_slice($parts, 1);
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$points_arr = $this->extractPoints($outer, $scale_data, true);
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foreach ($inner as $inner_poly) {
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$points_arr = array_merge(
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$points_arr, $this->extractPoints($inner_poly, $scale_data, true)
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);
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}
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}
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// draw polygon
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imagefilledpolygon($image, $points_arr, sizeof($points_arr) / 2, $color);
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// print label if applicable
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if (isset($label) && trim($label) != '') {
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imagestring($image, 1, $points_arr[2], $points_arr[3], trim($label), $black);
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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 POLYGON object
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* @param string $label Label for the GIS POLYGON object
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* @param string $fill_color Color for the GIS POLYGON object
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* @param array $scale_data Array containing data related to scaling
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* @param image $pdf TCPDF instance
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*
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* @return the modified TCPDF instance
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*/
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public function prepareRowAsPdf($spatial, $label, $fill_color, $scale_data, $pdf)
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{
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// allocate colors
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$red = hexdec(substr($fill_color, 1, 2));
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$green = hexdec(substr($fill_color, 3, 2));
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$blue = hexdec(substr($fill_color, 4, 2));
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$color = array($red, $green, $blue);
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// Trim to remove leading 'POLYGON((' and trailing '))'
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$polygon = substr($spatial, 9, (strlen($spatial) - 11));
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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, $scale_data, true);
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} else {
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// Seperate outer and inner polygons
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$parts = explode("),(", $polygon);
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$outer = $parts[0];
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$inner = array_slice($parts, 1);
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$points_arr = $this->extractPoints($outer, $scale_data, true);
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foreach ($inner as $inner_poly) {
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$points_arr = array_merge(
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$points_arr, $this->extractPoints($inner_poly, $scale_data, true)
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);
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}
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}
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// draw polygon
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$pdf->Polygon($points_arr, 'F*', array(), $color, true);
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// print label if applicable
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if (isset($label) && trim($label) != '') {
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$pdf->SetXY($points_arr[2], $points_arr[3]);
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$pdf->SetFontSize(5);
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$pdf->Cell(0, 0, trim($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 POLYGON object
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* @param string $label Label for the GIS POLYGON object
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* @param string $fill_color Color for the GIS POLYGON object
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* @param array $scale_data Array containing data related to scaling
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*
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* @return the code related to a row in the GIS dataset
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*/
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public function prepareRowAsSvg($spatial, $label, $fill_color, $scale_data)
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{
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$polygon_options = array(
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'name' => $label,
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'id' => $label . rand(),
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'class' => 'polygon vector',
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'stroke' => 'black',
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'stroke-width'=> 0.5,
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'fill' => $fill_color,
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'fill-rule' => 'evenodd',
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'fill-opacity'=> 0.8,
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);
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// Trim to remove leading 'POLYGON((' and trailing '))'
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$polygon = substr($spatial, 9, (strlen($spatial) - 11));
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$row = '<path d="';
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// If the polygon doesnt have an inner polygon
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if (strpos($polygon, "),(") === false) {
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$row .= $this->_drawPath($polygon, $scale_data);
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} else {
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// Seperate outer and inner polygons
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$parts = explode("),(", $polygon);
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$outer = $parts[0];
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$inner = array_slice($parts, 1);
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$row .= $this->_drawPath($outer, $scale_data);
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foreach ($inner as $inner_poly) {
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$row .= $this->_drawPath($inner_poly, $scale_data);
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}
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}
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$row .= '"';
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foreach ($polygon_options as $option => $val) {
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$row .= ' ' . $option . '="' . trim($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 POLYGON object
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* @param int $srid Spatial reference ID
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* @param string $label Label for the GIS POLYGON object
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* @param string $fill_color Color for the GIS POLYGON object
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* @param array $scale_data Array containing data related to scaling
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*
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* @return JavaScript related to a row in the GIS dataset
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*/
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public function prepareRowAsOl($spatial, $srid, $label, $fill_color, $scale_data)
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{
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$style_options = array(
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'strokeColor' => '#000000',
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'strokeWidth' => 0.5,
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'fillColor' => $fill_color,
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'fillOpacity' => 0.8,
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'label' => $label,
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'fontSize' => 10,
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);
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if ($srid == 0) {
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$srid = 4326;
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}
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$row = $this->getBoundsForOl($srid, $scale_data);
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// Trim to remove leading 'POLYGON((' and trailing '))'
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$polygon = substr($spatial, 9, (strlen($spatial) - 11));
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$row .= 'vectorLayer.addFeatures(new OpenLayers.Feature.Vector(';
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$row .= $this->addPointsForOpenLayersPolygon($polygon, $srid);
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$row .= 'null, ' . json_encode($style_options) . '));';
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return $row;
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}
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/**
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* Draws a ring of the polygon using SVG path element.
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*
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* @param string $polygon The ring
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* @param array $scale_data Array containing data related to scaling
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*
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* @return the code to draw the ring
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*/
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private function _drawPath($polygon, $scale_data)
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{
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$points_arr = $this->extractPoints($polygon, $scale_data);
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$row = ' M ' . $points_arr[0][0] . ', ' . $points_arr[0][1];
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$other_points = array_slice($points_arr, 1, count($points_arr) - 2);
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foreach ($other_points as $point) {
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$row .= ' L ' . $point[0] . ', ' . $point[1];
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}
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$row .= ' Z ';
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return $row;
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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 $gis_data GIS data
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* @param int $index Index into the parameter object
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* @param string $empty Value for empty points
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*
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* @return WKT with the set of parameters passed by the GIS editor
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*/
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public function generateWkt($gis_data, $index, $empty = '')
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{
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$no_of_lines = isset($gis_data[$index]['POLYGON']['no_of_lines'])
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? $gis_data[$index]['POLYGON']['no_of_lines'] : 1;
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if ($no_of_lines < 1) {
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$no_of_lines = 1;
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}
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$wkt = 'POLYGON(';
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for ($i = 0; $i < $no_of_lines; $i++) {
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$no_of_points = isset($gis_data[$index]['POLYGON'][$i]['no_of_points'])
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? $gis_data[$index]['POLYGON'][$i]['no_of_points'] : 4;
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if ($no_of_points < 4) {
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$no_of_points = 4;
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}
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$wkt .= '(';
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for ($j = 0; $j < $no_of_points; $j++) {
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$wkt .= ((isset($gis_data[$index]['POLYGON'][$i][$j]['x'])
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&& trim($gis_data[$index]['POLYGON'][$i][$j]['x']) != '')
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? $gis_data[$index]['POLYGON'][$i][$j]['x'] : $empty)
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. ' ' . ((isset($gis_data[$index]['POLYGON'][$i][$j]['y'])
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&& trim($gis_data[$index]['POLYGON'][$i][$j]['y']) != '')
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? $gis_data[$index]['POLYGON'][$i][$j]['y'] : $empty) .',';
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}
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$wkt = substr($wkt, 0, strlen($wkt) - 1);
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$wkt .= '),';
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}
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$wkt = substr($wkt, 0, strlen($wkt) - 1);
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$wkt .= ')';
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return $wkt;
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}
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/**
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* Calculates the area of a closed simple polygon.
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*
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* @param array $ring array of points forming the ring
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*
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* @return the area of a closed simple polygon.
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||||
*/
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public static function area($ring)
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{
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$no_of_points = count($ring);
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// If the last point is same as the first point ignore it
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$last = count($ring) - 1;
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if (($ring[0]['x'] == $ring[$last]['x'])
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&& ($ring[0]['y'] == $ring[$last]['y'])
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) {
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$no_of_points--;
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}
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||||
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||||
// _n-1
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||||
// A = _1_ \ (X(i) * Y(i+1)) - (Y(i) * X(i+1))
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// 2 /__
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// i=0
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||||
$area = 0;
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for ($i = 0; $i < $no_of_points; $i++) {
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||||
$j = ($i + 1) % $no_of_points;
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||||
$area += $ring[$i]['x'] * $ring[$j]['y'];
|
||||
$area -= $ring[$i]['y'] * $ring[$j]['x'];
|
||||
}
|
||||
$area /= 2.0;
|
||||
|
||||
return $area;
|
||||
}
|
||||
|
||||
/**
|
||||
* Determines whether a set of points represents an outer ring.
|
||||
* If points are in clockwise orientation then, they form an outer ring.
|
||||
*
|
||||
* @param array $ring array of points forming the ring
|
||||
*
|
||||
* @return whether a set of points represents an outer ring.
|
||||
*/
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||||
public static function isOuterRing($ring)
|
||||
{
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||||
// If area is negative then it's in clockwise orientation,
|
||||
// i.e. it's an outer ring
|
||||
if (PMA_GIS_Polygon::area($ring) < 0) {
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Determines whether a given point is inside a given polygon.
|
||||
*
|
||||
* @param array $point x, y coordinates of the point
|
||||
* @param array $polygon array of points forming the ring
|
||||
*
|
||||
* @return whether a given point is inside a given polygon
|
||||
*/
|
||||
public static function isPointInsidePolygon($point, $polygon)
|
||||
{
|
||||
// If first point is repeated at the end remove it
|
||||
$last = count($polygon) - 1;
|
||||
if (($polygon[0]['x'] == $polygon[$last]['x'])
|
||||
&& ($polygon[0]['y'] == $polygon[$last]['y'])
|
||||
) {
|
||||
$polygon = array_slice($polygon, 0, $last);
|
||||
}
|
||||
|
||||
$no_of_points = count($polygon);
|
||||
$counter = 0;
|
||||
|
||||
// Use ray casting algorithm
|
||||
$p1 = $polygon[0];
|
||||
for ($i = 1; $i <= $no_of_points; $i++) {
|
||||
$p2 = $polygon[$i % $no_of_points];
|
||||
if ($point['y'] > min(array($p1['y'], $p2['y']))) {
|
||||
if ($point['y'] <= max(array($p1['y'], $p2['y']))) {
|
||||
if ($point['x'] <= max(array($p1['x'], $p2['x']))) {
|
||||
if ($p1['y'] != $p2['y']) {
|
||||
$xinters = ($point['y'] - $p1['y'])
|
||||
* ($p2['x'] - $p1['x'])
|
||||
/ ($p2['y'] - $p1['y']) + $p1['x'];
|
||||
if ($p1['x'] == $p2['x'] || $point['x'] <= $xinters) {
|
||||
$counter++;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
$p1 = $p2;
|
||||
}
|
||||
|
||||
if ($counter % 2 == 0) {
|
||||
return false;
|
||||
} else {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a point that is guaranteed to be on the surface of the ring.
|
||||
* (for simple closed rings)
|
||||
*
|
||||
* @param array $ring array of points forming the ring
|
||||
*
|
||||
* @return a point on the surface of the ring
|
||||
*/
|
||||
public static function getPointOnSurface($ring)
|
||||
{
|
||||
// Find two consecutive distinct points.
|
||||
for ($i = 0; $i < count($ring) - 1; $i++) {
|
||||
if ($ring[$i]['y'] != $ring[$i + 1]['y']) {
|
||||
$x0 = $ring[$i]['x'];
|
||||
$x1 = $ring[$i + 1]['x'];
|
||||
$y0 = $ring[$i]['y'];
|
||||
$y1 = $ring[$i + 1]['y'];
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (! isset($x0)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Find the mid point
|
||||
$x2 = ($x0 + $x1) / 2;
|
||||
$y2 = ($y0 + $y1) / 2;
|
||||
|
||||
// Always keep $epsilon < 1 to go with the reduction logic down here
|
||||
$epsilon = 0.1;
|
||||
$denominator = sqrt(pow(($y1 - $y0), 2) + pow(($x0 - $x1), 2));
|
||||
$pointA = array(); $pointB = array();
|
||||
|
||||
while (true) {
|
||||
// Get the points on either sides of the line
|
||||
// with a distance of epsilon to the mid point
|
||||
$pointA['x'] = $x2 + ($epsilon * ($y1 - $y0)) / $denominator;
|
||||
$pointA['y'] = $y2 + ($pointA['x'] - $x2) * ($x0 - $x1) / ($y1 - $y0);
|
||||
|
||||
$pointB['x'] = $x2 + ($epsilon * ($y1 - $y0)) / (0 - $denominator);
|
||||
$pointB['y'] = $y2 + ($pointB['x'] - $x2) * ($x0 - $x1) / ($y1 - $y0);
|
||||
|
||||
// One of the points should be inside the polygon,
|
||||
// unless epcilon chosen is too large
|
||||
if (PMA_GIS_Polygon::isPointInsidePolygon($pointA, $ring)) {
|
||||
return $pointA;
|
||||
} elseif (PMA_GIS_Polygon::isPointInsidePolygon($pointB, $ring)) {
|
||||
return $pointB;
|
||||
} else {
|
||||
//If both are outside the polygon reduce the epsilon and
|
||||
//recalculate the points(reduce exponentially for faster convergance)
|
||||
$epsilon = pow($epsilon, 2);
|
||||
if ($epsilon == 0) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
/** Generate parameters for the GIS data editor from the value of the GIS column.
|
||||
*
|
||||
* @param string $value of the GIS column
|
||||
* @param index $index of the geometry
|
||||
*
|
||||
* @return parameters for the GIS data editor from the value of the GIS column
|
||||
*/
|
||||
public function generateParams($value, $index = -1)
|
||||
{
|
||||
if ($index == -1) {
|
||||
$index = 0;
|
||||
$params = array();
|
||||
$data = PMA_GIS_Geometry::generateParams($value);
|
||||
$params['srid'] = $data['srid'];
|
||||
$wkt = $data['wkt'];
|
||||
} else {
|
||||
$params[$index]['gis_type'] = 'POLYGON';
|
||||
$wkt = $value;
|
||||
}
|
||||
|
||||
// Trim to remove leading 'POLYGON((' and trailing '))'
|
||||
$polygon = substr($wkt, 9, (strlen($wkt) - 11));
|
||||
// Seperate each linestring
|
||||
$linerings = explode("),(", $polygon);
|
||||
$params[$index]['POLYGON']['no_of_lines'] = count($linerings);
|
||||
|
||||
$j = 0;
|
||||
foreach ($linerings as $linering) {
|
||||
$points_arr = $this->extractPoints($linering, null);
|
||||
$no_of_points = count($points_arr);
|
||||
$params[$index]['POLYGON'][$j]['no_of_points'] = $no_of_points;
|
||||
for ($i = 0; $i < $no_of_points; $i++) {
|
||||
$params[$index]['POLYGON'][$j][$i]['x'] = $points_arr[$i][0];
|
||||
$params[$index]['POLYGON'][$j][$i]['y'] = $points_arr[$i][1];
|
||||
}
|
||||
$j++;
|
||||
}
|
||||
return $params;
|
||||
}
|
||||
}
|
||||
?>
|
||||
Reference in New Issue
Block a user