/**
* Add links to clickable SVG elements in a chart with SVG driver.
*
* @param ezcGraphChart $chart
* @return void
*/
public static function linkSvgElements(ezcGraphChart $chart)
{
if (!$chart->driver instanceof ezcGraphSvgDriver) {
throw new ezcGraphToolsIncompatibleDriverException($chart->driver, 'ezcGraphSvgDriver');
}
$fileName = $chart->getRenderedFile();
if (!$fileName) {
throw new ezcGraphToolsNotRenderedException($chart);
}
$dom = new DOMDocument();
$dom->load($fileName);
$xpath = new DomXPath($dom);
$elements = $chart->renderer->getElementReferences();
// Link chart elements
foreach ($elements['data'] as $dataset => $datapoints) {
foreach ($datapoints as $datapoint => $ids) {
$url = $chart->data[$dataset]->url[$datapoint];
if (empty($url)) {
continue;
}
foreach ($ids as $id) {
$element = $xpath->query('//*[@id = \'' . $id . '\']')->item(0);
$element->setAttribute('style', $element->getAttribute('style') . ' cursor: ' . $chart->driver->options->linkCursor . ';');
$element->setAttribute('onclick', "top.location = '{$url}'");
}
}
}
// Link legend elements
if (isset($elements['legend'])) {
foreach ($elements['legend'] as $objectName => $ids) {
$url = $elements['legend_url'][$objectName];
if (empty($url)) {
continue;
}
foreach ($ids as $id) {
$element = $xpath->query('//*[@id = \'' . $id . '\']')->item(0);
$element->setAttribute('style', $element->getAttribute('style') . ' cursor: ' . $chart->driver->options->linkCursor . ';');
$element->setAttribute('onclick', "top.location = '{$url}'");
}
}
}
$dom->save($fileName);
}
