Implementation code for php to generate pie chart effect

Implementation code for php to generate pie chart effect_PHP tutorial

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Release： 2016-07-20 11:10:23

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Many codes can be used to generate pie charts. The example we introduce today is a pie chart effect that generates statistical data based on the PHP gd library. Students in need can refer to it.

The code is as follows

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//+--------- ----------------+
//| pie3dfun.PHP//Public functions|
//+--------------- ---------+
define("ANGLE_STEP", 5); //Define the angle step when drawing an elliptical arc
function draw_getdarkcolor($img,$clr) //Find $clr Corresponding dark color
{
$rgb = imagecolorsforindex($img,$clr);
return array($rgb["red"]/2,$rgb["green"]/2,$rgb ["blue"]/2);
}
function draw_getexy($a, $b, $d) //Find the point coordinates on the ellipse corresponding to angle $d
{
$d = deg2rad($d);
return array(round($a*Cos($d)), round($b*Sin($d)));
}
function draw_arc($img ,$ox,$oy,$a,$b,$sd,$ed,$clr) //Elliptic arc function
{
$n = ceil(($ed-$sd)/ANGLE_STEP);
$d = $sd;
list($x0,$y0) = draw_getexy($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, $x0+$ox, $y0+$oy, $x+$ox, $y+$oy, $clr);
$x0 = $x;
$y0 = $y;
}
}
function draw_sector($img, $ox, $oy, $a, $b, $sd, $ed, $clr) //Draw a sector
{
$n = ceil(($ed-$sd)/ANGLE_STEP);
$d = $sd;
list($x0,$y0) = draw_getexy($a, $b , $d);
imageline($img, $x0+$ox, $y0+$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, $x0+$ox, $y0+$oy, $x+$ox, $y+$oy, $clr);
$x0 = $x;
$y0 = $y;
}
imageline($img, $x0+$ox, $y0+$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, $clr) //3d sector
{
draw_sector($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 to index color
{
$R = ($clr>>16) & 0xff;
$G = ($clr>>8)& 0xff;
$B = ($clr) & 0xff;
return imagecolorallocate($img, $R, $G, $B);
}
// Drawing main function and output image
// $datLst is the data array, $datLst is the label array, $datLst is the color array
// The dimensions of the above three arrays should be equal
function draw_img($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
$w = 10+$a* 2;
$h = 10+$b*2+$v+($fh+2)*$n;
$img = imagecreate($w, $h);
//Convert RGB to Index color
for($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 the background color
imagefill($img, 0, 0, $clrbk);
//Sum
$tot = 0;
for($i=0; $i<$n; $i++)
$tot += $datLst[$i ];
$sd = 0;
$ed = 0; 333
$ly = 10+$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 label
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 generated image
$imgFileName = "../temp/".time().".png";
imagepng($img,$imgFileName);
echo ''''''''''''''''''''''''''''''' ''''''''''''''''''''''''''''''''''
}
$datLst = array(30, 10, 20, 20, 10, 20, 10, 20); //data
$labLst = array("University of Science and Technology of China", "Anhui University of Science and Technology", "Tsinghua University", "Peking University", "Nanjing University", "Shanghai University", "Hohai University", "Sun Yat-sen University"); //Tag
$clrLst = array(0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999);
//Draw
draw_img($datLst,$labLst,$clrLst);
?>

The rendering is as follows