Sector

Add-On Sector

Informations

Author: Maxime Delorme
License: FPDF

Description

This script allows to draw the sector of a circle. It can be used for example to render a pie chart.

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: starting angle (in degrees).
b: ending angle (in degrees).
style: D, F, FD or DF (draw, fill, fill and draw). Default value: FD.
cw: indicates whether to go clockwise (default value: true).
o: origin of angles (0 for right, 90 for top, 180 for left, 270 for bottom). Default value: 90.

Source

<?php
require('fpdf.php');

class PDF_Sector extends FPDF
{
    function Sector($xc, $yc, $r, $a, $b, $style='FD', $cw=true, $o=90)
    {
        $d0 = $a - $b;
        if($cw){
            $d = $b;
            $b = $o - $a;
            $a = $o - $d;
        }else{
            $b += $o;
            $a += $o;
        }
        while($a<0)
            $a += 360;
        while($a>360)
            $a -= 360;
        while($b<0)
            $b += 360;
        while($b>360)
            $b -= 360;
        if ($a > $b)
            $b += 360;
        $b = $b/360*2*M_PI;
        $a = $a/360*2*M_PI;
        $d = $b - $a;
        if ($d == 0 && $d0 != 0)
            $d = 2*M_PI;
        $k = $this->k;
        $hp = $this->h;
        if (sin($d/2))
            $MyArc = 4/3*(1-cos($d/2))/sin($d/2)*$r;
        else
            $MyArc = 0;
        //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($b)
                        );
        }
        //terminate drawing
        if($style=='F')
            $op='f';
        elseif($style=='FD' || $style=='DF')
            $op='b';
        else
            $op='s';
        $this->_out($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));
    }
}
?>

Example

<?php
require('sector.php');

$pdf=new PDF_Sector();
$pdf->AddPage();
$xc=105;
$yc=60;
$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();
?>

View the result here.

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