<?
define("ANGLE_STEP", 5); //定義畫橢圓弧時的角度步長

function draw_getdarkcolor($img,$clr) //求$clr對應(yīng)的暗色
{
$rgb = imagecolorsforindex($img,$clr);
return array($rgb["red"]/2,$rgb["green"]/2,$rgb["blue"]/2);
}

function draw_getexy($a, $b, $d) //求角度$d對應(yīng)的橢圓上的點坐標
{
$d = deg2rad($d);
return array(round($a*Cos($d)), round($b*Sin($d)));
}

function draw_arc($img,$ox,$oy,$a,$b,$sd,$ed,$clr) //橢圓弧函數(shù)
{
$n = ceil(($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) //畫扇面
{
$n = ceil(($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, $clr) //3d扇面
{
draw_sector($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轉(zhuǎn)索引色

{
$R = ($clr>>16) & 0xff;
$G = ($clr>>8)& 0xff;
$B = ($clr) & 0xff;
return imagecolorallocate($img, $R, $G, $B);
}

// 繪圖主函數(shù)，并輸出圖片
// $datLst 為數(shù)據(jù)數(shù)組, $datLst 為標簽數(shù)組, $datLst 為顏色數(shù)組
// 以上三個數(shù)組的維數(shù)應(yīng)該相等
function draw_img($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);//數(shù)據(jù)項個數(shù)

$w = 10+$a*2;
$h = 10+$b*2+$v+($fh+2)*$n;

$img = imagecreate($w, $h);

//轉(zhuǎn)RGB為索引色
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);

//填充背景色
imagefill($img, 0, 0, $clrbk);

//求和
$tot = 0;
for($i=0; $i<$n; $i++)
$tot += $datLst[$i];
$sd = 0;
$ed = 0;
$ly = 10+$b*2+$v;
for($i=0; $i<$n; $i++)
{
$sd = $ed;
$ed += $datLst[$i]/$tot*360;

//畫圓餅
draw_sector3d($img, $ox, $oy, $a, $b, $v, $sd, $ed, $clrLst[$i]); //$sd,$ed,$clrLst[$i]);

//畫標簽
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, "C:\WINNT\Fonts\simsun.ttc", $str.":".$datLst[$i]."(".(round(10000*($datLst[$i]/$tot))/100)."%)");
$ly += $fh+2;
}

//輸出圖形
header("Content-type: image/png");

//輸出生成的圖片
$imgFileName = "../temp/".time().".png";
imagepng($img,$imgFileName);

}

$datLst = array(30, 10, 20, 20, 10, 20, 10, 20); //數(shù)據(jù)
$labLst = array("中國科技大學(xué)", "安徽理工大學(xué)", "清華大學(xué)", "北京大學(xué)", "南京大學(xué)", "上海大學(xué)", "河海大學(xué)", "中山大學(xué)"); //標簽
$clrLst = array(0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999);

//畫圖
draw_img($datLst,$labLst,$clrLst);
?>