Drupal: unable to set labels for x axis using Charts module -

i want create line chart displaying changes in share price on time using drupal charts 7.x-2.0-rc1 api , google charts library. tried following code , populated chart random values:

$chart = array(     '#type' => 'chart',     '#chart_type' => 'line',     '#chart_library' => 'google',     '#title' => t(''),     '#legend' => false,     '#colors' => array('ff6600'),     '#width' => 480,     '#height' => 240,     '#data_labels' => true,     '#raw_options' => array(         'vaxis' => array(             'viewwindowmode' => 'explicit',             'viewwindow' => array(                 'min' => 1,             ),         ),         'haxis' => array(             'showtextevery' => 20         )     ), );  $data = array(); ($i = 0; $i < 100; $i++) {     $data[$i] = array(date('h:i', strtotime("+$i minute")), (rand(5, 10) / 10) * 6); }  $chart['price'] = array(     '#type' => 'chart_data',     '#title' => t('share price'),     '#show_in_legend' => false,     '#data' => $data,     '#decimal_count' => 2, );  $sharechart['chart'] = $chart;  return drupal_render($sharechart); 

i following output: chart

i want x axis display cerain labels (in example interval of 20 minutes) 'showtextevery' option doesn't work. ideas why? maybe there way achive that?

date/time values on haxis result in continuous axis

'showtextevery' works discrete axis, resulting string values

see discrete vs continuous

as such, need provide own ticks

maybe try this, generate data, along ticks, first...

$data = array(); $ticks = array(); $x = 0; ($i = 0; $i < 100; $i++) {     $data[$i] = array(date('h:i', strtotime("+$i minute")), (rand(5, 10) / 10) * 6);     if ($i % 20 == 0) {         $ticks[$x] = date('h:i', strtotime("+$i minute"));         $x++;     } } 

then in chart definition...

$chart = array(     'haxis' => array(         'ticks' => $ticks     )