<?
//+------------------------+
//| 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<＄n; ＄i++)
