Pokemon Dark Phantom cheat code php three-dimensional pie chart implementation code

After hard work, pie3d is completed, and the good stuff is shared with everyone. However, I am new to PHP and the code may not be refined enough. I hope everyone can give me some advice and work together to improve this program. Remember to notify me (estorm@yeah.net)
+------------------------+
| pie3dfun.php//Public function|
+- -----------------------+
define("ANGLE_STEP",5);//Define the angle step when drawing an elliptical arc
function chx_getdarkcolor($ img,$clr){//Find the dark color corresponding to $clr
$rgb=imagecolorsforindex($img,$clr);
return array($rgb["red"]/2,$rgb["green"]/2 ,$rgb["blue"]/2);
}
function chx_getexy($a,$b,$d){//Find the coordinates of the point on the ellipse corresponding to the angle $d
$d=deg2rad($d) ;
return array(round($a*Cos($d)),round($b*Sin($d)));
}
function chx_arc($img,$ox,$oy,$a,$b ,$sd,$ed,$clr){//Elliptic arc function
$n=ceil(($ed-$sd)/ANGLE_STEP);
$d=$sd;
list($x0,$y0)= chx_getexy($a,$b,$d);
for($i=0;$i$d=($d+ANGLE_STEP)>$ed?$ed:($ d+ANGLE_STEP);
list($x,$y)=chx_getexy($a,$b,$d);
imageline($img,$x0+$ox,$y0+$oy,$x+$ox,$y+ $oy,$clr);
$x0=$x;
$y0=$y;
}
}
function chx_sector($img,$ox,$oy,$a,$b,$sd,$ed, $clr){//Draw a fan
$n=ceil(($ed-$sd)/ANGLE_STEP);
$d=$sd;
list($x0,$y0)=chx_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)=chx_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,$y)=chx_getexy($a/2,$b/2,($d+$sd)/2);
imagefill($img,$x+$ox,$y+$oy,$clr);
}
function chx_sector3d($img,$ox,$oy,$a,$b,$v,$sd,$ed,$ clr){//3d sector
chx_sector($img,$ox,$oy,$a,$b,$sd,$ed,$clr);
if($sdlist($R, $G,$B)=chx_getdarkcolor($img,$clr);
$clr=imagecolorallocate($img,$R,$G,$B);
if($ed>180) $ed=180;
list ($sx,$sy)=chx_getexy($a,$b,$sd);
$sx+=$ox;
$sy+=$oy;
list($ex,$ey)=chx_getexy($a,$ b,$ed);
$ex+=$ox;
$ey+=$oy;
imageline($img,$sx,$sy,$sx,$sy+$v,$clr);
imageline($img, $ex,$ey,$ex,$ey+$v,$clr);
chx_arc($img,$ox,$oy+$v,$a,$b,$sd,$ed,$clr);
list ($sx,$sy)=chx_getexy($a,$b,($sd+$ed)/2);
$sy+=$oy+$v/2;
$sx+=$ox;
imagefill($img, $sx,$sy,$clr);
}
}
function chx_getindexcolor($img,$clr){//RBG to index color
$R=($clr>>16) & 0xff;
$G= ($clr>>8)& 0xff;
$B=($clr) & 0xff;
return imagecolorallocate($img,$R,$G,$B);
}
?>
+--- -----------------------+
| pie3d.php //Three-dimensional pie chart file|
+--------------------- ---------------+
require("pie3dfun.php");
$a=150;//Ellipse major semi-axis
$b=50;//Ellipse segment semi-axis
$v=20;//Height of round cake
$f//Font
$ox=5+$a;
$oy=5+$b;
$fw=imagefontwidth($font);
$fh=imagefontheight( $font);
$datLst=array(30,10,20,20,10,20,10,20);//data
$labLst=array("a1","a2","a3","a4 ","a5","a6","a7","a8");//Tag
$clrLst=array(0x99ff00,0xff6666,0x0099ff,0xff99ff,0xffff99,0x99ffff,0xff3333,0x009999);
$w=10 +$a*2;
$h=10+$b*2+$v+($fh+2)*count($datLst);
$img=imagecreate($w,$h);
//Convert to RGB For the index color
for($i=0;$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
$sd=0;
$ed=0;
$ ly=10+$b*2+$v;
for($i=0;$i $sd=$ed;
$ed+=$datLst[$i]/$tot*360;
//Draw a round cake
chx_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);
$ly+=$fh+2;
}
//Output graphics
header("Content-type:image/gif");
imagegif($img);
?>

The above introduces the implementation code of the PHP three-dimensional pie chart of the Pokemon Dark Phantom cheat code, including the content of the Pokemon Dark Phantom cheat code. I hope it will be helpful to friends who are interested in PHP tutorials.