PHP/Chart/Bar Chart

A Dynamic Bar Chart

   <source lang="html4strict">

<?php header("Content-type: image/gif"); $cells = array ( liked=>200, hated=>400, indifferent=>900 ); $max = max( $cells ); $total = count ( $cells ); $totalwidth = 300; $totalheight = 200; $xgutter = 20; // left/right margin $ygutter = 20; // top/bottom margin $internalgap = 10; // space between cells $bottomspace = 30; // gap at the bottom (in addition to margin) $font = "ARIALBD.TTF";

$graphCanX = ( $totalwidth - $xgutter*2 );

$graphCanY = ( $totalheight - $ygutter*2 - $bottomspace );// starting draw position x - axis $posX = $xgutter; // starting draw pos - y - axis $posY = $totalheight - $ygutter - $bottomspace; $cellwidth = (int) (( $graphCanX - ( $internalgap * ( $total-1 ) )) / $total) ;

$textsize = (int)($bottomspace);

// adjust font size while ( list( $key, $val ) = each ( $cells ) )

   {
    while ( 1 )
       {
       $box = ImageTTFbBox( $textsize, 0, $font, $key );
       $textWidth = abs( $box[2] );
       if ( $textWidth < $cellwidth )
           break;
       $textsize--;
       }
   }

$image = imagecreate( $totalwidth, $totalheight ); $red = ImageColorAllocate($image, 255, 0, 0); $blue = ImageColorAllocate($image, 0, 0, 255 ); $black = ImageColorAllocate($image, 0, 0, 0 ); $grey = ImageColorAllocate($image, 100, 100, 100 );

reset ($cells);
while ( list( $key, $val ) = each ( $cells ) )
    {
    $cellheight = (int) (($val/$max) * $graphCanY);
    $center = (int)($posX+($cellwidth/2));
   imagefilledrectangle( $image, $posX, ($posY-$cellheight), ($posX+$cellwidth), $posY, $blue );
    $box = ImageTTFbBox( $textsize, 0, $font, $key );
    $tw = $box[2];
    ImageTTFText(    $image, $textsize, 0, ($center-($tw/2)),
            ($totalheight-$ygutter), $black, $font, $key );
    $posX += ( $cellwidth + $internalgap);
    }
imagegif( $image );
?>

      </source>