PHP Generate pie chart Effect implementation Code _php tutorial

Generate pie chart A lot of code can be implemented, today we introduced this example is based on a PHP GD library to generate statistical data of the pie chart effect, the need for students can refer to.

The code is as follows

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//+------------------------+ //| Pie3dfun. php//Common Functions | //+------------------------+ Define ("Angle_step", 5); Defines the angle step when drawing an elliptical arc function Draw_getdarkcolor ($img, $CLR)//$CLR the corresponding dark color { $rgb = Imagecolorsforindex ($img, $CLR); return Array ($rgb ["Red"]/2, $rgb ["Green"]/2, $rgb ["Blue"]/2); } function draw_getexy ($a, $b, $d)//$d point coordinates on the ellipse corresponding to the angle { $d = Deg2rad ($d); Return Array (round ($a *cos ($d)), round ($b *sin ($d))); } function Draw_arc ($img, $ox, $oy, $a, $b, $SD, $ed, $CLR)//Elliptical arc function { $n = Ceil (($ed-$SD)/angle_step); $d = $SD; List ($x 0, $y 0) = draw_getexy ($a, $b, $d); for ($i =0; $i < $n; $i + +) { $d = ($d +angle_step) > $ed $ed:($d +angle_step); List ($x, $y) = Draw_getexy ($a, $b, $d); Imageline ($img, $x 0+ $ox, $y 0+ $oy, $x + $ox, $y + $oy, $CLR); $x 0 = $x; $y 0 = $y; } } function Draw_sector ($img, $ox, $oy, $a, $b, $SD, $ed, $CLR)//Draw slices { $n = Ceil (($ed-$SD)/angle_step); $d = $SD; List ($x 0, $y 0) = draw_getexy ($a, $b, $d); Imageline ($img, $x 0+ $ox, $y 0+ $oy, $ox, $oy, $CLR); for ($i =0; $i < $n; $i + +) { $d = ($d +angle_step) > $ed $ed:($d +angle_step); List ($x, $y) = Draw_getexy ($a, $b, $d); Imageline ($img, $x 0+ $ox, $y 0+ $oy, $x + $ox, $y + $oy, $CLR); $x 0 = $x; $y 0 = $y; } Imageline ($img, $x 0+ $ox, $y 0+ $oy, $ox, $oy, $CLR); List ($x, $y) = Draw_getexy ($a/2, $b/2, ($d + $sd)/2); Imagefill ($img, $x + $ox, $y + $oy, $CLR); } function Draw_sector3d ($img, $ox, $oy, $a, $b, $v, $SD, $ed, $clr)//3d fan { Draw_sector ($img, $ox, $oy, $a, $b, $SD, $ed, $CLR); if ($SD <180) { List ($R, $G, $B) = Draw_getdarkcolor ($img, $CLR); $CLR =imagecolorallocate ($img, $R, $G, $B); if ($ed >180) $ed = 180; List ($SX, $sy) = Draw_getexy ($a, $b, $SD); $SX + = $ox; $sy + = $oy; List ($ex, $ey) = Draw_getexy ($a, $b, $ed); $ex + = $ox; $ey + = $oy; Imageline ($img, $SX, $sy, $SX, $sy + $v, $CLR); Imageline ($img, $ex, $ey, $ex, $ey + $v, $CLR); Draw_arc ($img, $ox, $oy + $v, $a, $b, $SD, $ed, $CLR); List ($SX, $sy) = Draw_getexy ($a, $b, ($SD + $ed)/2); $sy + = $oy + $v/2; $SX + = $ox; Imagefill ($img, $SX, $sy, $CLR); } } function Draw_getindexcolor ($img, $CLR)//RBG goto Index Color { $R = ($clr >>16) & 0xFF; $G = ($clr >>8) & 0xFF; $B = ($CLR) & 0xFF; Return Imagecolorallocate ($img, $R, $G, $B); } Draw the main function and output the picture $datLst as an array of data, $datLst as an array of labels, $datLst as an array of colors The dimensions of the above three arrays should be equal function draw_img ($datLst, $labLst, $clrLst, $a =250, $b =120, $v =20, $font =10) { $ox = 5+ $a; $oy = 5+ $b; $FW = Imagefontwidth ($font); $fh = Imagefontheight ($font); $n = count ($datLst);//number of data items $w = $a $h = $b *2+ $v + ($fh +2) * $n; $img = Imagecreate ($w, $h); Turn RGB to indexed color for ($i =0; $i < $n; $i + +) $clrLst [$i] = Draw_getindexcolor ($img, $clrLst [$i]); $CLRBK = Imagecolorallocate ($img, 0xFF, 0xFF, 0xff); $CLRT = Imagecolorallocate ($img, 0x00, 0x00, 0x00); Fill background color Imagefill ($img, 0, 0, $CLRBK); Sum $tot = 0; for ($i =0; $i < $n; $i + +) $tot + = $datLst [$i]; $SD = 0; $ed = 0; 333 $ly = $b *2+ $v; for ($i =0; $i < $n; $i + +) { $SD = $ed; $ed + = $datLst [$i]/$tot *360; Draw a round cake Draw_sector3d ($img, $ox, $oy, $a, $b, $v, $SD, $ed, $clrLst [$i]); $SD, $ed, $clrLst [$i]); Draw Labels Imagefilledrectangle ($img, 5, $ly, 5+ $fw, $ly + $fh, $clrLst [$i]); Imagerectangle ($img, 5, $ly, 5+ $fw, $ly + $fh, $CLRT); Imagestring ($img, $font, 5+2* $fw, $ly, $labLst [$i]. ":". $datLst [$i]. " (". (Round (10000* ($datLst [$i]/$tot))/100). "%)", $CLRT); $str = Iconv ("GB2312", "UTF-8", $labLst [$i]); Imagettftext ($img, $font, 0, 5+2* $FW, $ly +13, $CLRT, "./simsun.ttf", $str. ":". $datLst [$i]. " (". (Round (10000* ($datLst [$i]/$tot)/100) "%)"); $ly + = $fh +2; } Output graphics Header ("Content-type:image/png"); Output the resulting picture $imgFileName = ". /temp/". Time ().". PNG "; Imagepng ($img, $imgFileName); "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" } $datLst = Array (30, 10, 20, 20, 10, 20, 10, 20); Data $labLst = Array ("China University of Science and Technology", "Anhui Polytechnic University", "Tsinghua University", "Peking University", "Nanjing University", "Shanghai University", "Hohai Univ.", "Zhongshan University"); Label $clrLst = Array (0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999); Drawing Draw_img ($datLst, $labLst, $clrLst); ?>

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