SlatePermutate Files · inc/class.graph.php

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binki

Fix problem when clicking ``Register for Classes'' where an XHTML validation error was thrown.

This error was caused by the ajax request using the HTTP GET method instead of POST. The HTTP GET method has a limitted length and the serialized querystring was much longer than that limit, causing fun errors. Perhaps this querystring limit was even on the browser side instead of apache-side... or perhaps apache was returning an error page to the browser about the querystring.

<?php

class barGraph {

// This array of values is just here for the example.
private $values = array();
private $image = null;

// Pass me a multidimensional array with 'count', the size, and 'label', the label
public function __construct($userVals, $width=600, $height=300) {

  $this->values = $userVals;


  // Get the total number of columns we are going to plot
  $columns  = count($this->values);
  if($columns == 0) {
    throw new Exception("No input data!");
  }
  if($width < 5 || $height < 5) {
    throw new Exception("Image size too small!");
  }

  // Set the amount of space between each column
  $padding = 5; 

  // Get the width of 1 column
  $column_width = $width / $columns ;

  // Generate the image variables
  $im        = imagecreate($width,$height);
  $gray      = imagecolorallocate ($im,0xcc,0xcc,0xcc);
  $gray_lite = imagecolorallocate ($im,0xee,0xee,0xee);
  $gray_dark = imagecolorallocate ($im,0x7f,0x7f,0x7f);
  $white     = imagecolorallocate ($im,0xff,0xff,0xff);
  $black     = imagecolorallocate($im, 0, 0, 0);
    
  // Fill in the background of the image
  imagefilledrectangle($im,0,0,$width,$height,$white);
    
  $maxv = 0;

  // Calculate the maximum value we are going to plot
  for($i=0;$i<$columns;$i++)
    $maxv = max($this->values[$i]['count'], $maxv);

  // Now plot each column 
  for($i=0;$i<$columns;$i++) {
    $column_height = ($height / 100) * (( $this->values[$i]['count'] / $maxv) *100);
    $x1 = $i*$column_width;
    $y1 = $height-$column_height;
    $x2 = (($i+1)*$column_width)-$padding;
    $y2 = $height;

    imagefilledrectangle($im,$x1,$y1,$x2,$y2,$gray);

    $label = $this->values[$i]['label'];
    $font = '/usr/share/fonts/liberation/LiberationSans-Regular.ttf';
    $font2 = '/usr/share/fonts/liberation/LiberationSans-Bold.ttf';

    imagettftext($im, 10, 0, $x1 + ($column_width / 2) - 20, $height - 5, $black, $font, $label);
    imagettftext($im, 7, 0, $x1 + ($column_width / 2) - 7, $height - 20, $gray_dark, $font, $this->values[$i]['count']);
 
  }
  imagettftext($im, 10, 0, 0, 10, $black, $font2, "Past Month:");

  // Send the PNG header information. Replace for JPEG or GIF or whatever
  $this->image = $im;

  header ("Content-type: image/png");
  imagepng($this->image);
}

}

?>