imagearc

(PHP 4, PHP 5)

imagearc部分楕円を描画する

説明

bool imagearc ( resource $image , int $cx , int $cy , int $width , int $height , int $start , int $end , int $color )

imagearc() は、指定した座標を中心とする円弧を描画します。

パラメータ

image

imagecreatetruecolor() のような画像作成関数が返す画像リソース。

cx

中心の x 座標。

cy

中心の y 座標。

width

円弧の幅。

height

円弧の高さ。

start

始点の角度。

end

終点の角度。 0° は 3 時の位置で、そこから時計回りの方向に円弧が描かれます。

color

imagecolorallocate() で作成した色 ID。

返り値

成功した場合に TRUE を、失敗した場合に FALSE を返します。

例1 imagearc() による円の描画

<?php

// 200*200 の画像を作成します
$img imagecreatetruecolor(200200);

// 色を設定します
$white imagecolorallocate($img255255255);
$red   imagecolorallocate($img255,   0,   0);
$green imagecolorallocate($img,   0255,   0);
$blue  imagecolorallocate($img,   0,   0255);

// 頭を描きます
imagearc($img100100200200,  0360$white);
// 口を描きます
imagearc($img10010015015025155$red);
// 左右の目を描きます
imagearc($img,  60,  75,  50,  50,  0360$green);
imagearc($img140,  75,  50,  50,  0360$blue);

// 画像をブラウザに出力します
header("Content-type: image/png");
imagepng($img);

// メモリを解放します
imagedestroy($img);

?>

上の例の出力は、 たとえば以下のようになります。

出力例 : imagearc() による円の描画

参考

add a note add a note

User Contributed Notes 23 notes

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2
lucas dot delmas at live dot fr
1 year ago
The imagearc function has a precision of one degree. The function truncates the $start and $end values to the inferior degree.

For example if the starting angle you calculated is : -178.62450462172°
and the ending angle is : -152.78056427917°
imagearc will draw a curve from -178° to -152°.

If you need accurate curves drawing, you need to use a loop to draw little step-by-step lines. By creating a large number of short enough lines, you will create the impression of a curve with accuracy.
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1
marc at resiteit dot com
13 years ago
Round cornered anti-aliased dynamically sized button.

$w=40;
$h=20;
$im = ImageCreate($w,$h);
$white=ImageColorAllocate($im,255,255,255);
ImageFilledRectangle($im,0,0,$w,$h,$white);
imagecolortransparent ($im, $white);
ImageTTFText ($im, $h+ceil($h/3)+1, 0, -1, $h-1, $col1, "arialbd.ttf", "O");
ImageTTFText ($im, $h+ceil($h/3)+1, 0, $w-$h, $h-1, $col1, "arialbd.ttf", "O");
ImageTTFText ($im, $h+ceil($h/3)+1, 0, 1, $h-1, $col1, "arialbd.ttf", "O");
ImageTTFText ($im, $h+ceil($h/3)+1, 0, $w-$h-2, $h-1, $col1, "arialbd.ttf", "O");
$points=array(
    1,round($h/2),
    round($h/4),$h-round($h/4),
    round($h/2),$h,
    $w-(round($h/2)),$h,
    $w-(round($h/4)),$h-round($h/4),
    $w-2,round($h/2),
    $w-round($h/4),round($h/4),
    $w-round($h/2),0,
    round($h/2),0,
    round($h/4),round($h/4)
);
imagefilledpolygon ($im, $points, 10, $col1);

header("content-type: image/gif");
header("Content-Disposition: filename=name.gif");
ImageGif($im);
ImageDestroy($im);
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1
chandlerklebs at gmail dot com
2 years ago
This is an example script I wrote for myself to help me learn how to used the imagearc functions. Maybe if will also help others.

<?php
//example PHP script of imagearc functions
$image_width=360;$image_height=360;
$img = imagecreatetruecolor($image_width,$image_height); //make image variable

//create a background color by making a filled rectangle
$color = imagecolorallocate($img,255,255,255);
imagefilledrectangle($img,0,0,$image_width,$image_height,$color);

$r=$image_width/2 - $image_width/32 ; //radius
$cx=$image_width/2;
$cy=$image_height/2;

$color = imagecolorallocate($img,0,0,0);
imagearc($img, $cx, $cy, $r*2, $r*20, 360, $color); //regular outlines arc

imagefilledarc($img, $cx, $cy, $r*1, $r*10, 90, $color,IMG_ARC_CHORD); //filled triangle with chord of circle
imagefilledarc($img, $cx, $cy, $r*1, $r*1180, 270, $color,IMG_ARC_PIE); //pie slice

$font_number=5; //can use built in fonts numbered 1 to 5
$string="Hello world!";
imagestring($img, $font_number, $cx-(imagefontwidth($font_number)*strlen($string))/2, $cy-120, $string, $color);

header("Content-type: image/png");
imagepng($img);// output image in the browser

$filename="imagearc";
imagepng($img,"./frames/$filename.png",9); //make highly compressed png

imagedestroy($img);
?>
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0
ajim1417 at gmail dot com
4 years ago
I wrote a simple function that can draws an arc counter-clockwisekly. Here it is :

<?php

function imagearcCC(&$im, $cx, $cy, $w, $h, $s, $e, $c) {
$start = 360 - $e;
$end = 360 - $s;
return
imagearc($im, $cx, $cy, $w, $h, $start, $end, $c);
}

?>

The params of this function is exactly the same as the usual imagearc function.
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0
anton dot vandeghinste at telenet dot be
4 years ago
I needed an arc with a thick border and i didn't like to use 359.9 as end angle so i made a function that works pretty well:

<?php
function imagearcthick($image, $x, $y, $w, $h, $s, $e, $color, $thick = 1)
{
    if(
$thick == 1)
    {
        return
imagearc($image, $x, $y, $w, $h, $s, $e, $color);
    }
    for(
$i = 1;$i<($thick+1);$i++)
    {
       
imagearc($image, $x, $y, $w-($i/5), $h-($i/5),$s,$e,$color);
       
imagearc($image, $x, $y, $w+($i/5), $h+($i/5), $s, $e, $color);
    }
}
?>
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0
mojiro at awmn dot net
8 years ago
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);
}
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0
jerryscript at aol dot com
10 years ago
[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
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0
eamon at hostelworld dot com
10 years ago
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.
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0
Anonymous
11 years ago
Please note that in order to draw a complete circle or ellipse (without using the imageellipse) you mustn't use 0 for both s and e. If you do this you will get, umm, nothing. Instead set s to 0 and e to 360 to get a complete circle or ellipse.
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0
jinny at 263 dot net
12 years ago
imagesetstyle() sets the style to be used by all line drawing functions when drawing with the special color .

Here goes a example of drawing a dashed-line circle.enjoy!

<?php

header
("Content-type: image/jpeg");
$im = imagecreate(100,100);

$b   = imagecolorallocate ($im, 0, 0, 0);
$w   = imagecolorallocate ($im, 255, 255, 255);

$style = array ($b,$b,$b,$b,$b,$w,$w,$w,$w,$w);

imagesetstyle ($im, $style);

imagearc($im,50,50,100,100,0,360,IMG_COLOR_STYLED);

imagejpeg($im);
imagedestroy($im);
?>
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0
foripepe at yahoo dot com
13 years ago
To fill an arc (DiameterX != DiameterY):

<?
function imagefilledarc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color) {
    // To draw the arc
    imagearc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color);
    // To close the arc with 2 lines between the center and the 2 limits of the arc
    $x = $CenterX + (cos(deg2rad($Start))*($DiameterX/2));
    $y = $CenterY + (sin(deg2rad($Start))*($DiameterY/2));
    imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
    $x = $CenterX + (cos(deg2rad($End))*($DiameterX/2));
    $y = $CenterY + (sin(deg2rad($End))*($DiameterY/2));
    imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
    // To fill the arc, the starting point is a point in the middle of the closed space
    $x = $CenterX + (cos(deg2rad(($Start+$End)/2))*($DiameterX/4));
    $y = $CenterY + (sin(deg2rad(($Start+$End)/2))*($DiameterY/4));
    imagefilltoborder($Image, $x, $y, $Color, $Color);
}
?>

To close the arc with 2 lines (DiameterX != DiameterY):

<?
function imagenofilledarc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color) {
    // To draw the arc
    imagearc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color);
    // To close the arc with 2 lines between the center and the 2 limits of the arc
    $x = $CenterX + (cos(deg2rad($Start))*($DiameterX/2));
    $y = $CenterY + (sin(deg2rad($Start))*($DiameterY/2));
    imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
    $x = $CenterX + (cos(deg2rad($End))*($DiameterX/2));
    $y = $CenterY + (sin(deg2rad($End))*($DiameterY/2));
    imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
}
?>

An example:
<?
    $destImage = imagecreate( 216, 152 );
    $c0 = imagecolorallocate( $destImage, 0, 255, 255 );
    $c1 = imagecolorallocate( $destImage, 0, 0, 0 );
    $c2 = imagecolorallocate( $destImage, 255, 0, 0 );
    ImageFilledRectangle ( $destImage, 0, 0, 216, 152, $c0 );
    imagefilledarc( $destImage, 108, 76, 180, 80, 0, 130, $c1 );
    imagenofilledarc( $destImage, 108, 76, 180, 80, 0, 130, $c2 );
    header("content-type: image/PNG");
    ImagePNG( $destImage );
    ImageDestroy( $destImage );
?>
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0
travis at duluth dot com
14 years ago
The wierd thing is that the first two integers tell where to place the "circle".
So for example I first create the "pallet" to place the circle on.
$image = imagecreate(500, 500); 
(this makes a huge 500x500 gif :) )
$colorBody = imagecolorallocate($image, 0, 0, 0);
(make the default color of the "pallet" black
$circleColor = imagecolorallocate($image, 255, 0, 255);
(going to make the circle an ugly pink color)
imagearc($image, 250, 250, 300, 300, 0, 360, $circleColor);
Places the image in the center (250,250) and the circle is 300 pixels in diameter.

Hope this helps.

Travis Kent Beste
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-1
logang at deltatee dot com
11 years ago
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);
        }
    }
}
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-1
arve at skogvold dot as
12 years ago
I found a better way for drawing a pie chart:

header ("Content-type: image/png");
$diameter = 100;
$radius = $diameter / 2;
$centerX = $radius;
$centerY = $radius;

$im = @ImageCreate ($diameter, $diameter)
    or die ("Cannot Initialize new GD image stream");

$background = ImageColorAllocate ($im, 0, 0, 0);
$red = ImageColorAllocate ($im, 176, 0, 0);

function fill_arc($start, $end, $color) {
    global $diameter, $centerX, $centerY, $im, $radius;
    imagearc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color);
    imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start)) * $radius, $centerY + sin(deg2rad($start)) * $radius, $color);
    imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end)) * $radius, $centerY + sin(deg2rad($end)) * $radius, $color);
    imagefill ($im,$centerX + $radius * 0.5 *cos(deg2rad($start+($end-$start)/2)), $centerY + $radius * 0.5 * sin(deg2rad($start+($end-$start)/2)), $color);
    }


fill_arc(0,30,$red);
// Will make a red filled arc, starting at 0 degrees, ending at 30 degrees

ImagePng ($im);
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-1
Anonymous
13 years ago
The following site contains heaps of different functions to draw graphs with easy to follow code for newbies and heaps of examples with OVER 60 different predefined graphs
http://www.aditus.nu/jpgraph/index.php
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-1
nojer2 at yahoo dot com
13 years ago
Here's a dashed circle function:

<?php
function dashedcircle($im, $cx, $cy, $radius, $colour, $dashsize=5) {

  
$dash=false;
   for (
$angle=0; $angle<=(180+$dashsize); $angle+=$dashsize) {
     
$x = ($radius * cos(deg2rad($angle)));
     
$y = ($radius * sin(deg2rad($angle)));

      if (
$dash) {
        
imageline($im, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour);
        
imageline($im, $cx-$px, $cx-$py, $cx-$x, $cy-$y, $colour);
      }
     
$dash=!$dash;
     
$px=$x;
     
$py=$y;
   }
}
?>
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-1
nojer2 at yahoo dot com
13 years ago
Here's the function to draw rotated ellipses again. This time I've optimised it a bit, fixed the no-fill bug, and used a 'squishratio' rather than a 'radiusmodifier', to make the curves perfect, so ignore my previous version.

<?php
function rotatedellipse($im, $cx, $cy, $width, $height, $rotateangle, $colour, $filled=true) {
  
$step=2;
  
$cosangle=cos(deg2rad($rotateangle));
  
$sinangle=sin(deg2rad($rotateangle));

  
$squishratio = $height/$width;
  
$nopreviouspoint = true;
   for (
$angle=0; $angle<=(180+$step); $angle+=$step) {
      
     
$ox = ($width * cos(deg2rad($angle)));
     
$oy = ($width * sin(deg2rad($angle))) * $squishratio;

     
$x =  + (($ox * $cosangle) - ($oy * $sinangle));
     
$y = $centrey + (($ox * $sinangle) + ($oy * $cosangle));
 
      if (
$nopreviouspoint) {
       
$px=$x;
       
$py=$y;
       
$nopreviouspoint=false;
      }

      if (
$filled) {
        
triangle($im, $cx, $cy, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour);
        
triangle($im, $cx, $cy, $cx-$px, $cx-$py, $cx-$x, $cy-$y, $colour);
      } else {
        
imageline($im, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour);
        
imageline($im, $cx-$px, $cx-$py, $cx-$x, $cy-$y, $colour);
      }
     
$px=$x;
     
$py=$y;
   }
}

function
triangle($im, $x1,$y1, $x2,$y2, $x3,$y3, $colour) {
  
$coords = array($x1,$y1, $x2,$y2, $x3,$y3);
  
imagefilledpolygon($im, $coords, 3, $colour);
}
?>
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-1
timothyhouck at yahoo dot com
14 years ago
To do filled arcs, try something like this:

<?php
$diameter
= 50;
imagearc($image, 25, 25, $diameter, $diameter, $start, $end, $color);
while(
$diameter > 0) {
 
imagearc($image, 25, 25, $diameter, $diameter, $start, $start + 1, $color);
 
imagearc($image, 25, 25, $diameter, $diameter, $end - 1, $end, $color);
 
$diameter--;
}
?>

...well you get the point.  It's a kludge, and *very* slow, but it's free.
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-2
joe dot tym at gmail dot com
2 years ago
I didn't have much luck with the other two functions, one of them makes circles that look like they've been printed on a dot-matrix printer. This simple function builds a border out of circles, seems to work nicely.

<?php
function imagearcunfilled($image,$x,$y,$width,$height,$border_thickness, $color) {

       
imagesetthickness($image, 1);

       
$x_radius = $width / 2;
       
$y_radius = $height / 2;

        for (
$i = 0; $i < 360; $i++) {
                if (
TRUE) {
                       
$x2 = $x + cos($i) * $x_radius;
                       
$y2 = $y + sin($i) * $y_radius;
                       
imagefilledarc($image,$x2,$y2,$border_thickness,$border_thickness,0,360,$color,IMG_ARC_PIE);
                }
        }
}
?>
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-2
Michael
3 years ago
Hi, this is a function that replaces "imagearc" to solve the thickness-problem. it does not use the global value set by imagesetthickness, so you have to pass it along.

"connecting" the arc to lines is still a problem, it sometimes shifts by 1px, but so does the original function.

Theres still alot to improve ...

<?php
function myimagearc($im,$mid_x,$mid_y,$rad,$w1,$w2,$col,$thickness){
        global
$cols;
       
$rad+=$thickness/2;    // to calculate outer edge
       
$th_fact = 1-((($thickness-1)/$rad));       
       
       
$pts = 36*$rad;    // adjust density
       
$fact = $pts/360;
       
$w1 = $w1*$fact;
       
$w2 = $w2*$fact;
        if(
$thickness > 2)    // to make sure we have neither gaps nor ugly looking artefacts
           
imagesetthickness($handle,2);
        else
           
imagesetthickness($handle,1);   
       
$winkel = (2*pi())/$pts;
        for(
$i=$w1+1;$i< $w2;$i++){
           
$x = (cos($i*$winkel)*($rad));
           
$y = (sin($i*$winkel)*($rad));
           
$x1 = $x+$mid_x;
           
$y1 = $y+$mid_y;
           
$x2 = $th_fact*$x+$mid_x;
           
$y2 = $th_fact*$y+$mid_y;
           
imageline($im, $x1,$y1,$x2,$y2,$col);
        }
       
imagesetthickness($handle,1); // just to reset
   
}
?>
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-2
ruturaj_v at yahoo dot com
10 years ago
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($im, 'piechart.png');
?>
<img src='piechart.png'>
up
-2
ericquil at yahoo dot com
14 years ago
If circles overlap, a temporary border is needed when filling:
<?php
ImageArc
($im,$x,$y,$w,$h,0,360,$temp_color);
ImageFillToBorder($im,$x,$y,$temp_color,$fill_color);
ImageArc ($im,$x,$y,$w,$h,0,360,$fill_color);
?>
up
-3
cbriou at orange-art dot fr
14 years ago
There is another way to fill an arc :

<?php
// To draw the arc
$Color = imagecolorallocate($Image, $Red, $Green, $Blue);
imagearc($Image, $CenterX, $CenterY, $Diameter, $Diameter, $Start, $End, $Color);
// To close the arc with 2 lines between the center and the 2 limits of the arc
$x = $CenterX + (cos(deg2rad($Start))*($Diameter/2));
$y = $CenterY + (sin(deg2rad($Start))*($Diameter/2));
imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
$x = $CenterX + (cos(deg2rad($End))*($Diameter/2));
$y = $CenterY + (sin(deg2rad($End))*($Diameter/2));
imageline($Image, $x, $y, $CenterX, $CenterY, $Color);
// To fill the arc, the starting point is a point in the middle of the closed space
$x = $CenterX + (cos(deg2rad(($Start+$End)/2))*($Diameter/4));
$y = $CenterY + (sin(deg2rad(($Start+$End)/2))*($Diameter/4));
imagefilltoborder($Image, $x, $y, $Color, $Color);
?>
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