饼图的实现

<?php//+------------------------+//| pie3dfun.PHP//公用函数 |//+------------------------+define("ANGLE_STEP", 5); //定义画椭圆弧时的角度步长define("FONT_USED", "./simfang.ttf"); // 使用到的字体文件位置function draw_getdarkcolor($img,$clr) //求$clr对应的暗色{$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对应的椭圆上的点坐标{$d = deg2rad($d);return array(round($a*Cos($d)), round($b*Sin($d)));}function draw_arc($img,$ox,$oy,$a,$b,$sd,$ed,$clr) //椭圆弧函数{$n = ceil(($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, $clr) //画扇面{$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, $clr) //RBG转索引色{$R = ($clr>>16) & 0xff;$G = ($clr>>8)& 0xff;$B = ($clr) & 0xff;return imagecolorallocate($img, $R, $G, $B);}// 绘图主函数，并输出图片// $datLst 为数据数组, $datLst 为标签数组, $datLst 为颜色数组// 以上三个数组的维数应该相等function draw_img($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);//数据项个数$w = 10+$a*2;$h = 10+$b*2+$v+($fh+2)*$n;$img = imagecreate($w, $h);//转RGB为索引色for($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]/$tot*360;//画圆饼draw_sector3d($img, $ox, $oy, $a, $b, $v, $sd, $ed, $clrLst[$i]); //$sd,$ed,$clrLst[$i]);//画标签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, FONT_USED, $str.":".$datLst[$i]."(".(round(10000*($datLst[$i]/$tot))/100)."%)");$ly += $fh+2;}//输出图形header("Content-type: image/png");//输出生成的图片imagepng($img);}$datLst = array(30, 10, 20, 20, 10, 20, 10, 20); //数据$labLst = array("大学1", "大学2", "大学3", "大学4", "大学5", "大学6", "大学7", "大学8"); //标签$clrLst = array(0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999);//画图draw_img($datLst,$labLst,$clrLst);?>

 

转自 http://bbs.phpchina.com/viewthread.php?tid=10629&extra=&page=1