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imagearc

(PHP 3, PHP 4, PHP 5)

imagearc -- Draw a partial ellipse

Description

int imagearc ( resource image, int cx, int cy, int w, int h, int s, int e, int color )

imagearc() draws a partial ellipse centered at cx, cy (top left is 0, 0) in the image represented by image. W and h specifies the ellipse's width and height respectively while the start and end points are specified in degrees indicated by the s and e arguments. 0° is located at the three-o'clock position, and the arc is drawn clockwise.

Przykład 1. Drawing a circle with imagearc()


<?php



// create a 200*200 image

$img = imagecreate(200, 200);



// allocate some colors

$white = imagecolorallocate($img, 255, 255, 255);

$black = imagecolorallocate($img, 0, 0, 0);

   

// draw a black circle 

imagearc($img, 100, 100, 150, 150, 0, 360, $black);



// output image in the browser

header("Content-type: image/png");

imagepng($img);

   

// free memory

imagedestroy($img);



?>

User Contributed Notes

mojiro at awmn dot net
13-Dec-2005 09:28


A previous for the Rotated (Filled)Ellipse note from(nojer2 at yahoo dot com, 02-Apr-2001 12:06) has a mistake, at the second arc. Replace them with the following listing.



if ($filled) {

    triangle($im, $cx, $cy, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour);

    triangle($im, $cx, $cy, $cx-$px, $cy-$py, $cx-$x, $cy-$y, $colour);

} else {

    imageline($im, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour);

    imageline($im, $cx-$px, $cy-$py, $cx-$x, $cy-$y, $colour);

}

hans at lintoo dot dk
18-Jul-2004 04:19


When doing a pie chart... you really should not use imagearc, use imagefilledarc instead... it is much much easier...(and I guess every hosting company should support it by now)



3D Piechart:

Se my modified code at: http://dk.php.net/manual/en/function.imagefilledarc.php



For a quick sample see the online demo at:

http://webstatistik.lintoo.dk/

ruturaj_v at yahoo dot com
17-May-2004 03:32


this is another piechart eg. very simple ...



<?php

global $deg;



function get_polar($xrel, $yrel, $ang, $radius) {

    $i = $ang;

    $ang = ($ang * pi())/ 180;

    

    $ix = abs($radius*cos($ang));

    $iy = abs($radius*sin($ang));

    

    if ($i>=0 && $i<=90) {

        $ix = $xrel + $ix;

        $iy = $yrel - $iy;

    }

    if ($i>90 && $i<=180) {

        $ix = $xrel - $ix;

        $iy = $yrel - $iy;

    }

    if ($i>180 && $i<=270) {

        $ix = $xrel - $ix;

        $iy = $yrel + $iy;

    }

    if ($i>270 && $i<=360) {

        $ix = $xrel + $ix;

        $iy = $yrel + $iy;

    }



    $ix = floor($ix);

    $iy = floor($iy);

    //echo ($ix . " $iy<br>");

    $returnvals = array (

                        'x1' => $xrel,

                        'y1' => $yrel,

                        'x2' => $ix,

                        'y2' => $iy

                        );

    return $returnvals;

}



function get_degtotal($degindex)

{

    global $deg;

    if ($degindex == 0 ) {

       return (  $deg[$degindex] );

    }

    else {        

        return ( $deg[$degindex] + get_degtotal($degindex-1) );

    }    

}



$im  = imagecreate (400, 400); 

$w   = imagecolorallocate ($im, 255, 255, 255); 

$black   = imagecolorallocate ($im, 0, 0, 0); 

$red = imagecolorallocate ($im, 255, 0, 0); 

$green = imagecolorallocate ($im, 0, 180, 0); 



$randcolor[0] = imagecolorallocate($im, 243, 54, 163);

$randcolor[1] = imagecolorallocate($im, 179, 51, 247);

$randcolor[2] = imagecolorallocate($im, 103, 48, 250);

$randcolor[3] = imagecolorallocate($im, 53, 145, 244);

$randcolor[4] = imagecolorallocate($im, 54, 243, 243);

$randcolor[5] = imagecolorallocate($im, 107, 245, 180);

$randcolor[6] = imagecolorallocate($im, 203, 242, 111);

$randcolor[7] = imagecolorallocate($im, 248, 201, 105);



$data[0] = 30;

$data[1] = 20;

$data[2] = 15;

$data[3] = 10;

$data[4] = 8;

$data[5] = 7;

$data[6] = 5;

$data[7] = 5;



$datasum = array_sum($data);



$deg[0] = number_format((30 / $datasum * 360), 2, ".", "");

$deg[1] = number_format((20 / $datasum * 360), 2, ".", "");

$deg[2] = number_format((15 / $datasum * 360), 2, ".", "");

$deg[3] = number_format((10 / $datasum * 360), 2, ".", "");

$deg[4] = number_format((8 / $datasum * 360), 2, ".", "");

$deg[5] = number_format((7 / $datasum * 360), 2, ".", "");

$deg[6] = number_format((5 / $datasum * 360), 2, ".", "");

$deg[7] = number_format((5 / $datasum * 360), 2, ".", "");

echo ('<pre>');



//print_r($deg);



$datadeg = array();

$datapol = array();

$degbetween = array();

$databetweenpol = array();



for ($i=0; $i < count($deg) ; $i++) {

    $datadeg[$i] = get_degtotal($i);

    $datapol[$i] = get_polar(200, 200, $datadeg[$i], 100);

}



for ($i=0; $i < count($datadeg) ; $i++) {

    /*this is a trick where you take 2deg angle before

    and get the smaller radius so that you can have a pt to

    `imagefill` the chartboundary

    */

    $degbetween[$i] = ($datadeg[$i]-2);

    $databetweenpol[$i] = get_polar(200, 200, $degbetween[$i], 50);

}



print_r($datadeg);

print_r($degbetween);

print_r($databetweenpol);

//exit;



for ($i=0; $i<count($deg); $i++) {

    imageline ($im, 200, 200, $datapol[$i]['x2'], $datapol[$i]['y2'], $black);

}

imagearc($im, 200, 200, 200, 200, 0, 360, $black); 



for ($i=0; $i<count($deg); $i++) {

    imagefill ($im, $databetweenpol[$i]['x2'], $databetweenpol[$i]['y2'], $randcolor[$i]);



}



//header ("Content-type: image/png"); 

imagepng($im, 'piechart.png');

?>

<img src='piechart.png'>

jerryscript at aol dot com
26-Dec-2003 11:05


[note-Apache/1.3.29 (Win32) PHP/4.3.4]



The imagearc (and imageellipse) functions do not accept line thicknesses when drawn from 0 to 360 degrees.



Drawing from 0 to 359 and again from 359 to 360 does create an ellipse with the current line thickness.



Jerry

eamon at hostelworld dot com
17-Dec-2003 04:24


Right...

possibly the easiest way of drawing a filled circle:

Loop through the imagearc function incrementing the diameter by one pixel:

<?

 // --- code fragment --- //



for($i=1; $i<$Diameter; $i++){

  imagearc($Image, $CenterX, $CenterY, $i, $i, $Start, $End, $Color);

}



// --------------------- //



?>



This works great for circles with diameters up to about 60 or 70 pixels wide. After that, you start to get pixle gaps.

logang at deltatee dot com
05-Aug-2003 05:19


Heres a function to make a curve between two points... This will be a downward curve but it wouldn't be hard to make a similar function to make an upward curve. The first point has to be to the left of the second point ($x1 < $x2), and height is actually backwards. The larger height is the less of a crest the curve has. I imagine with a few modifications this functions could make upward curves as well.



function ImageCurveDown ($image, $x1, $y1, $x2, $y2, $height, $color) {

    $presicion = 1;



    for ($left = ($x1-$x2); $left < 0; $left++){

        if ($y1 < $y2) {

            $cy = $y2 + $height;

            $cx = $x1 - $left;

        } else {

            $cy = $y1 + $height;

            $cx = $x2 + $left;

        }

        $nx1 = abs($x1 - $cx);

        $ny1 = abs($y1 - $cy);

        $nx2 = abs($x2 - $cx);

        $ny2 = abs($y2 - $cy);



        if ($y1 < $y2) {

            if ($nx2 == 0 || $ny1 == 0) continue;

            $angle1 = atan($height/$nx2);

            $A1 = $nx2/cos ($angle1);

            $B1 = $ny2/sin ($angle1);

            $angle2 = pi()/2 +atan($left/$ny1);

            $A2 = $nx1/cos ($angle2);

            $B2 = $ny1/sin ($angle2);

        } else {

            if ($ny2 == 0 || $nx1 == 0) continue;

            $angle1 = atan($ny2/$nx2);

            $A1 = abs($nx2/cos ($angle1));

            $B1 = abs($ny2/sin ($angle1));

            $angle2 = atan($height/$nx1);

            $A2 = abs ($nx1/cos ($angle2));

            $B2 = abs($ny1/sin ($angle2));

        }



        if (abs($A1 - $A2) < $presicion && abs ($B1 - $B2) < $presicion) {

            ImageArc($image, $cx, $cy, $A1*2, $B1*2, 180+rad2deg($angle2), 360-rad2deg($angle1), $color);

        }

    }

}

23-Jan-2003 05:55


Please note that in order to draw a complete circle or ellipse (without using the imageellipse) you mustn't use 0