/*******************************************
  Initial calculations for graph 
*******************************************/
// set up constants
putenv('GDFONTPATH=C:\WINNT\Fonts');
$width=500;        // width of image in pixels - this will fit in 640x480
$left_margin = 50; // space to leave on left of image
$right_margin= 50; // ditto right   
$bar_height = 40;  
$bar_spacing = $bar_height/2; 
$font = 'arial';
$title_size= 16; // point
$main_size= 12; // point
$small_size= 12; // point
$text_indent = 10; // position for text labels on left

// set up initial point to draw from
$x = $left_margin + 60;  // place to draw baseline of the graph
$y = 50;                 // ditto 
$bar_unit = ($width-($x+$right_margin)) / 100;   // one "point" on the graph

// calculate height of graph - bars plus gaps plus some margin
$height = $num_candidates * ($bar_height + $bar_spacing) + 50;