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Sector
InformationsAuthor: Maxime Delorme
License: Freeware
DescriptionThis script allows to draw the sector of a circle. It can be used for instance to render pie
charts.
It requires FPDF 1.51.
function Sector(float xc, float yc, float r, float a, float b [, string style [, boolean cw [, float o]]])
xc: abscissa of the center.
yc: ordinate of the center.
r: radius.
a: start angle (in degrees).
b: end angle (in degrees).
style: D, F, FD or DF (draw, fill, fill and draw). Default: FD.
cw: indicates whether to go clockwise (default: true).
o: origin of angles (0 for 3 o'clock, 90 for noon, 180 for 9 o'clock, 270 for 6 o'clock).
Default: 90.
Source
<?php
require('fpdf.php');
class PDF_Sector extends FPDF
{
function Sector($xc, $yc, $r, $a, $b, $style='FD', $cw=true, $o=90)
{
if($cw){
$d = $b;
$b = $o - $a;
$a = $o - $d;
}else{
$b += $o;
$a += $o;
}
$a = ($a%360)+360;
$b = ($b%360)+360;
if ($a > $b)
$b +=360;
$b = $b/360*2*M_PI;
$a = $a/360*2*M_PI;
$d = $b-$a;
if ($d == 0 )
$d =2*M_PI;
$k = $this->k;
$hp = $this->h;
if($style=='F')
$op='f';
elseif($style=='FD' or $style=='DF')
$op='b';
else
$op='s';
if (sin($d/2))
$MyArc = 4/3*(1-cos($d/2))/sin($d/2)*$r;
//first put the center
$this->_out(sprintf('%.2f %.2f m', ($xc)*$k, ($hp-$yc)*$k));
//put the first point
$this->_out(sprintf('%.2f %.2f l', ($xc+$r*cos($a))*$k, (($hp-($yc-$r*sin($a)))*$k)));
//draw the arc
if ($d < M_PI/2){
$this->_Arc($xc+$r*cos($a)+$MyArc*cos(M_PI/2+$a),
$yc-$r*sin($a)-$MyArc*sin(M_PI/2+$a),
$xc+$r*cos($b)+$MyArc*cos($b-M_PI/2),
$yc-$r*sin($b)-$MyArc*sin($b-M_PI/2),
$xc+$r*cos($b),
$yc-$r*sin($b)
);
}else{
$b = $a + $d/4;
$MyArc = 4/3*(1-cos($d/8))/sin($d/8)*$r;
$this->_Arc($xc+$r*cos($a)+$MyArc*cos(M_PI/2+$a),
$yc-$r*sin($a)-$MyArc*sin(M_PI/2+$a),
$xc+$r*cos($b)+$MyArc*cos($b-M_PI/2),
$yc-$r*sin($b)-$MyArc*sin($b-M_PI/2),
$xc+$r*cos($b),
$yc-$r*sin($b)
);
$a = $b;
$b = $a + $d/4;
$this->_Arc($xc+$r*cos($a)+$MyArc*cos(M_PI/2+$a),
$yc-$r*sin($a)-$MyArc*sin(M_PI/2+$a),
$xc+$r*cos($b)+$MyArc*cos($b-M_PI/2),
$yc-$r*sin($b)-$MyArc*sin($b-M_PI/2),
$xc+$r*cos($b),
$yc-$r*sin($b)
);
$a = $b;
$b = $a + $d/4;
$this->_Arc($xc+$r*cos($a)+$MyArc*cos(M_PI/2+$a),
$yc-$r*sin($a)-$MyArc*sin(M_PI/2+$a),
$xc+$r*cos($b)+$MyArc*cos($b-M_PI/2),
$yc-$r*sin($b)-$MyArc*sin($b-M_PI/2),
$xc+$r*cos($b),
$yc-$r*sin($b)
);
$a = $b;
$b = $a + $d/4;
$this->_Arc($xc+$r*cos($a)+$MyArc*cos(M_PI/2+$a),
$yc-$r*sin($a)-$MyArc*sin(M_PI/2+$a),
$xc+$r*cos($b)+$MyArc*cos($b-M_PI/2),
$yc-$r*sin($b)-$MyArc*sin($b-M_PI/2),
$xc+$r*cos($b),
$yc-$r*sin($b)
);
}
//terminate drawing
$this->_out($op);
}
function _Arc($x1, $y1, $x2, $y2, $x3, $y3 )
{
$h = $this->h;
$this->_out(sprintf('%.2f %.2f %.2f %.2f %.2f %.2f c',
$x1*$this->k,
($h-$y1)*$this->k,
$x2*$this->k,
($h-$y2)*$this->k,
$x3*$this->k,
($h-$y3)*$this->k));
}
}
?>
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Example
<?php
require('sector.php');
$pdf=new PDF_Sector();
$pdf->Open();
$pdf->AddPage();
$xc=105;
$yc=55;
$r=40;
$pdf->SetFillColor(120, 120, 255);
$pdf->Sector($xc, $yc, $r, 20, 120);
$pdf->SetFillColor(120, 255, 120);
$pdf->Sector($xc, $yc, $r, 120, 250);
$pdf->SetFillColor(255, 120, 120);
$pdf->Sector($xc, $yc, $r, 250, 20);
$pdf->Output();
?>
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View the result here.
DownloadZIP | TGZ
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