源代码：

//+------------------------+

//| pie3dfun.PHP//公用函数 |

//+------------------------+

define("ANGLE_STEP", 5); //定义画椭圆弧时的角度步长

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

{

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

{

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

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

tot += datLst[i];

sd = 0;

ed = 0; 333

ly = 10+b*2+v;

for(i=0; 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, "./simsun.ttf", 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

imgFileName = "../temp/".time().".png";

imagepng(img,imgFileName);

echo '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

}

datLst = array(30, 10, 20, 20, 10, 20, 10, 20); //数据

labLst = array("中国科技大学", "安徽理工大学", "清华大学", "北京大学", "南京大学", "上海大学", "河海大学", "中山大学"); //标签

clrLst = array(0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999);

//画图

draw_img(datLst,labLst,clrLst);

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来源:网络