Displaying poll results as a pie chart.

When I've had to create graphic charts I've used the Google Charts module. This does require doing some coding.

Looking at the poll_view_results you can see how to get your poll results numbers. You'd want to write a similar function to that, but return the results as a chart.

Here's an example of working with code to create a chart: (not adapted to working with poll results)

    foreach ($answer as $key => $value) {
        $chart['#labels'][] = $value['label'].': '.$value['count']; 
        $chart['#data'][] = (($value['count']) ? $value['count'] : '0');
        $chart['#data_colors'][] = chart_unique_color($field.$key);
      }
      $chart['#type'] = CHART_TYPE_PIE;
      $chart['#size'] = chart_size(500, 200);
      $chart['#encoding'] = CHART_ENCODING_TEXT;
      $chart['#chart_id'] = $field;
      $output .= chart_render($chart).'<hr />';

Note: Its been a while since I coded for the charts module so setting up the chart array may have changed.

It can take a bit of reading to understand all the options in the Google Charts api.

Another option would be overriding the theme functions in the poll module. In this case I've used the fusioncharts module to produce the charts.
Place the contents of this file inside your themes template.php file replacing references to 'mytheme' with the name of your theme.

function mytheme_poll_results($title, $results, $votes, $links, $block, $nid, $vote) {
    $output .= '<div class="poll">';
    $output .= '<div class="title">'. $title .'</div>';
    $output .= fusioncharts_render(FUSIONCHART_ARRAY, 'mytheme_pollresults', 'poll_'. $nid, array('block' => $block));
    $output .= '<div class="total">'. t('Total votes: %votes', array('%votes' => $votes)) .'</div>';
    $output .= '</div>';
    $output .= '<div class="links">'. theme('links', $links) .'</div>';
  return $output;
}


function mytheme_poll_bar($title, $percentage, $votes, $block, $return = NULL) {
  static $data; //we will collect all data from multiple calls to this function
  if (isset($return)) {
    return $data;
  }
  else {
    $data[] = array($title, $percentage);
  }
}

function mytheme_pollresults_fusionchart_callback($args = NULL) {
  $data = mytheme_poll_bar('', '', '', '', 1);
  $type = 'Column 3D';
  $settings = array();
  $attributes = array();
  if ($args['block'] == 1) {
    $width = 200;
    $height = 200;
    $attributes['color'] = array('FF0000', '00ff00', '0000ff', 'ffff00', 'ff00ff', '00ffff'); //no # in front of color
    $settings['showvalues'] = 0;
    $settings['shownames'] = 1;
	}
  else {
    $width = 400;
    $height = 300;    
  }
  return array($data, $type, $settings, $attributes, $width, $height);
}

http://drupal.org/node/404840

 $chart = array(
      '#chart_id' => 'test_chart',
      '#title' => chart_title(t('Answers'), 'cc0000', 15),
      '#type' => CHART_TYPE_PIE,
      '#size' => chart_size(400, 200),
    );


// Here is my query , i am taking data from database table and creating a pie chart on the basis of data taken 


$result = db_query("select field_p_like_value, count(field_p_like_value) as times_entered from field_revision_field_p_like group by field_p_like_value");

//while( $resquery_res = db_fetch_object($resquery) ) {



	foreach ($result as $resquery_res) {	
    
  $chart['#data'][$resquery_res->field_p_like_value] = $resquery_res->times_entered;


  $chart['#labels'][] = t($resquery_res->field_p_like_value);


}
return theme('chart', array('chart' => $chart));