Convert list of points to encoded string following Google's Polyline
Algorithm.
/**
* Decode string and generate a full SVG document.
*
* @uses DOMDocument
* @param string $encoded - Encoded polyline
* @return string - SVG document
*/
public static function DecodeToSVG($encoded)
{
// Create list of points
$points = parent::Decode($encoded);
// Grab first pair
list($x, $y) = self::shiftPoint($points);
// Path will need to start by moving to first coordinate.
$path = sprintf('M %f %f L ', $x, $y);
// Init bounding box's min & max.
$minX = $maxX = $x;
$minY = $maxY = $y;
while ($points) {
// This can be simplified with php-5.5's generators.
list($x, $y) = self::shiftPoint($points);
$path .= sprintf('%f %f, ', $x, $y);
// Grow MBR
if ($x < $minX) {
$minX = $x;
}
if ($y < $minY) {
$minY = $y;
}
if ($x > $maxX) {
$maxX = $x;
}
if ($y > $maxY) {
$maxY = $y;
}
}
// Close poylgon
$path = rtrim($path, ', ') . ' Z';
// Create viewBox from MBR points
$mbr = sprintf("%f %f %f %f", $minX, $minY, abs($maxX - $minX), abs($maxY - $minY));
return self::generateSVG($path, $mbr);
}
public function addPath($placemark)
{
parent::addPath($placemark);
$pointArr = array();
foreach ($placemark->getGeometry()->getPoints() as $point) {
$pointArr[] = array($point['lat'], $point['lon']);
}
$polyline = Polyline::encodeFromArray($pointArr);
$style = $placemark->getStyle();
if ($style === null) {
// color can be 0xRRGGBB or
// {black, brown, green, purple, yellow, blue, gray, orange, red, white}
$styleArgs = array('color:red');
} else {
$styleArgs = array();
$color = $style->getStyleForTypeAndParam(MapStyle::LINE, MapStyle::COLOR);
if ($color) {
$styleArgs[] = 'color:0x' . htmlColorForColorString($color);
}
$weight = $style->getStyleForTypeAndParam(MapStyle::LINE, MapStyle::WEIGHT);
if ($weight) {
$styleArgs[] = 'weight:' . $weight;
}
}
$this->paths[] = implode('|', $styleArgs) . '|enc:' . $polyline;
}
/**
* Test rounding issues report by issue #10
*
* @return NULL
*/
public function testRounding()
{
$originalPoints = array(48.000006, 2.000004, 48.00001, 2.0);
$encoded = Polyline::encode($originalPoints);
$this->assertEquals('a_~cH_seK??', $encoded);
$decodedPoints = Polyline::decode($encoded);
$this->assertTrue($decodedPoints[0] === $decodedPoints[2]);
$this->assertTrue($decodedPoints[1] === $decodedPoints[3]);
}
/**
* Encoded WKB from blob
*
* This method will copy the given blob to memory descriptor. There's better
* ways to do this.
*
* @param string $blob - Binary safe string
* @return string
*/
public function encodeFromBlob($blob)
{
$this->fd = fopen('php://memory', 'wb');
fwrite($this->fd, $blob);
fseek($this->fd, 0);
$points = $this->parseWkb();
fclose($this->fd);
return parent::Encode($points);
}
/**
* @covers Polyline::Pair
*/
public function testPairBadInput()
{
$this->assertEquals(array(), Polyline::Pair('not a list'));
}
public function addPath($points, $style=null)
{
$polyline = Polyline::encodeFromArray($points);
if ($style === null) {
// color can be 0xRRGGBB or
// {black, brown, green, purple, yellow, blue, gray, orange, red, white}
$styleArgs = array('color:red');
} else {
$styleArgs = array();
$color = $style->getStyleForTypeAndParam(MapStyle::LINE, MapStyle::COLOR);
if ($color) $styleArgs[] = 'color:0x'.$color;
$weight = $style->getStyleForTypeAndParam(MapStyle::LINE, MapStyle::WEIGHT);
if ($weight) $styleArgs[] = 'weight:'.$weight;
}
$this->paths[] = implode('|', $styleArgs).'|enc:'.$polyline;
}
/**
* Static instance method
*
* @return Polyline
* @deprecated
* @codeCoverageIgnore
* @ignore
*/
public static function Singleton()
{
trigger_error('Polyline::Singleton deprecated.', E_USER_DEPRECATED);
return self::$instance instanceof self ? self::$instance : (self::$instance = new self());
}
