Pie chart generation class and example-php Tutorial

Pie chart generation class and example

The pie chart is automatically generated based on input parameters. /* * Generate pie slices */ Class PieChart { Private $ center; // pie-shaped midpoint Private $ width; // pie diameter Private $ image; // graphic object Function _ construct ($ width, $ backcolor = array ("r" => 0xFF, "g" => 0xFF, "B" => 0xFF ))){ $ This-> width = $ width; $ This-> center = $ width/2; // Create a graphic object $ This-> image = imagecreatetruecolor ($ this-> width, $ this-> width ); // Fill the initial image in White $ Color = imagecolorallocate ($ this-> image, $ backcolor [0] ["r"], $ backcolor [0] ["g"], $ backcolor [0] ["B"]); Imagefill ($ this-> image, 0, 0, $ color ); } // Set graphical data Public function graphData ($ data, $ colors ){ $ Black = imagecolorallocate ($ this-> image, 0x00, 0x00, 0x00 ); $ Sum = array_sum ($ data ); $ Start =-90; For ($ I = 0; $ I $ Color = imagecolorallocate ($ this-> image, $ colors [$ I] ["r"], $ colors [$ I] ["g"], $ colors [$ I] ["B"]); $ Stop = @ ($ data [$ I]/$ sum * 360) + $ start; Imagefilledarc ($ this-> image, $ this-> center, $ this-> center, $ This-> width, $ this-> width, $ start, $ stop, $ color, IMG_ARC_PIE ); Imagefilledarc ($ this-> image, $ this-> center, $ this-> center, $ This-> width, $ this-> width, $ start, $ stop, $ black, IMG_ARC_NOFILL | IMG_ARC_EDGED ); $ Start = $ stop; } } // Generate the image Public function flushImage (){ Header ("Content-type: image/png "); Imagepng ($ this-> image ); } } ?> Include_once 'piechart. cls. php '; $ Total = $ _ GET ["total"]; $ Count = $ _ GET ["count"]; $ Data = array ($ total-$ count, $ count ); $ Colors = array ( Array ('R' => 0xDD, 'G' => 0xEE, 'B' => 0xFF ), Array ('R' => 0xFF, 'G' => 0xBB, 'B' => 0xAA) ); $ Chart = new PieChart (200, array ("r" => 0xF9, "g" => 0xF9, "B" => 0xF9 ))); $ Chart-> graphData ($ data, $ colors ); $ Chart-> flushImage (); ?>