GD and Image 函数
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PHP手册

imagefilledellipse

(PHP 4 >= 4.0.6, PHP 5)

imagefilledellipse — 画一椭圆并填充

说明

bool imagefilledellipse ( resource $image , int $cx , int $cy , int $w , int $h , int $color )

imagefilledellipse() 在 image 所代表的图像中以 cx，cy（图像左上角为 0, 0）为中心画一个椭圆。w 和 h 分别指定了椭圆的宽和高。椭圆用 color 颜色填充。成功时返回 TRUE， 或者在失败时返回 FALSE.

Example #1 imagefilledellipse() 例子

<?php

// create a blank image
$image = imagecreatetruecolor(400, 300);

// fill the background color
$bg = imagecolorallocate($image, 0, 0, 0);

// choose a color for the ellipse
$col_ellipse = imagecolorallocate($image, 255, 255, 255);

// draw the white ellipse
imagefilledellipse($image, 200, 150, 300, 200, $col_ellipse);

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

?>

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

参见 imageellipse() 和 imagefilledarc()。

参数

image

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

cx

x-coordinate of the center.

cy

y-coordinate of the center.

width

The ellipse width.

height

The ellipse height.

color

The fill color. A color identifier created with imagecolorallocate().

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE.

范例

Example #2 imagefilledellipse() example

<?php

// create a blank image
$image = imagecreatetruecolor(400, 300);

// fill the background color
$bg = imagecolorallocate($image, 0, 0, 0);

// choose a color for the ellipse
$col_ellipse = imagecolorallocate($image, 255, 255, 255);

// draw the white ellipse
imagefilledellipse($image, 200, 150, 300, 200, $col_ellipse);

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

?>

以上例程的输出类似于：

Output of example : imagefilledellipse()

注释

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

参见

GD and Image 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 画一椭圆并填充

用户评论:

Mark (08-Dec-2008 01:03)

This draws an anti-aliased circle with an optional border. Call with <img src="circle.php?r=50&fg=ff0000&bg=000000&bw=5&bc=ffff00"/> to draw a filled circle with radius=50, foreground color=red, background color=black, border width=5, and border color=yellow. Assumes register_globals is on, but you can fix that easily.

<?php
header('Content-type: image/png');

is_numeric($r) or $r = 8;
is_numeric($bw) or $bw = 0;
strlen($fg)==6 or $fg = 'e8e8e8';
strlen($bg)==6 or $bg = 'ffffff';
strlen($bc)==6 or $bc = '000000';

function hex2rgb($im,$hex) {
    return imagecolorallocate($im,
        hexdec(substr($hex,0,2)),
        hexdec(substr($hex,2,2)),
        hexdec(substr($hex,4,2))
        );
}

$a = $r*2;
$b = $a*4;
$c = $b/2;
$d = $b;
$e = $d-($bw*8);

$im1 = imagecreatetruecolor($b,$b);
$im2 = imagecreatetruecolor($a,$a);
imagefill($im1,0,0,hex2rgb($im1,$bg));
if($bw) imagefilledellipse($im1,$c,$c,$d,$d,hex2rgb($im1,$bc));
imagefilledellipse($im1,$c,$c,$e,$e,hex2rgb($im1,$fg));
imagecopyresampled($im2,$im1,0,0,0,0,$a,$a,$b,$b);
imagepng($im2);
?>

sunbox at gmx dot net (20-Oct-2006 12:15)

draws a gradient filled ellipse with alpha color support based on felixbruns at <ANTI-SPAM>web dot de imagegradientellipse function. thx felixbruns :o)

function imagegradientellipsealpha($image, $cx, $cy, $w, $h, $ic, $oc){
       $w = abs($w);
       $h = abs($h);
       $oc = array(0xFF & ($oc >> 0x10), 0xFF & ($oc >> 0x8), 0xFF & $oc);
       $ic = array(0xFF & ($ic >> 0x10), 0xFF & ($ic >> 0x8), 0xFF & $ic);
       $c0 = ($oc[0] - $ic[0]) / $w;
       $c1 = ($oc[1] - $ic[1]) / $w;
       $c2 = ($oc[2] - $ic[2]) / $w;
       $ot = $oc >> 24;
       $it = $ic >> 24;
       $ct = ($ot - $it) / $w;
       $i = 0;
       $j = 0;
       $is = ($w<$h)?($w/$h):1;
       $js = ($h<$w)?($h/$w):1;
       while(1){
           $r = $oc[0] - floor($i * $c0);
           $g = $oc[1] - floor($i * $c1);
           $b = $oc[2] - floor($i * $c2);
           $t = $ot - floor($i * $ct);
           $c = imagecolorallocatealpha($image, $r, $g, $b, $t);
           imageellipse($image, $cx, $cy, $w-$i, $h-$j, $c);
           if($i < $w){
               $i += $is;
           }
           if($j < $h){
               $j += $js;
           }
           if($i >= $w && $j >= $h){
               break;
           }
       }
    }

felixbruns at <ANTI-SPAM>web dot de (27-Aug-2006 01:57)

I quickly made a gradient ellipse function (i took some code from other gradient functions). It works like imageellipse or imagefilledellipse but with two color parameters: $ic is the inner color of the gradient ellipse and $oc is the outer color.

<?php

function imagegradientellipse($image, $cx, $cy, $w, $h, $ic, $oc){
    $w = abs($w);
    $h = abs($h);
    $oc = array(0xFF & ($oc >> 0x10), 0xFF & ($oc >> 0x8), 0xFF & $oc);
    $ic = array(0xFF & ($ic >> 0x10), 0xFF & ($ic >> 0x8), 0xFF & $ic);
    $c0 = ($oc[0] - $ic[0]) / $w;
    $c1 = ($oc[1] - $ic[1]) / $w;
    $c2 = ($oc[2] - $ic[2]) / $w;
    $i = 0;
    $j = 0;
    $is = ($w<$h)?($w/$h):1;
    $js = ($h<$w)?($h/$w):1;
    while(1){
        $r = $oc[0] - floor($i * $c0);
        $g = $oc[1] - floor($i * $c1);
        $b = $oc[2] - floor($i * $c2);
        $c = imagecolorallocate($image, $r, $g, $b);
        imagefilledellipse($image, $cx, $cy, $w-$i, $h-$j, $c);
        if($i < $w){
            $i += $is;
        }
        if($j < $h){
            $j += $js;
        }
        if($i >= $w && $j >= $h){
            break;
        }
    }
}

?>

jbr at ya-right dot com (23-Feb-2006 03:33)

This is a niffty function that you can use to make transparent ellipse/round type cutouts of any PNG or GIF image. The hard part is finding what color to use for the cutout layer and then the transparent layer, because you don't want to set the transparent index to a color being used in the image. After that it's as simple as layering the two images together.

what you need for the example...

a image of the size you want the cutout to be, gif or png (true color /256) can be used!

<?

$original_image = './image.png';
$output_image = './new.png';
$temp_image = './temp'; // path and name (don't include the extension)
$is_true_color = true;

$ext = substr ( $original_image, strrpos ( $original_image, '.' ) );
$temp_image .= $ext;
$new = image_get ( $ext, $original_image );
$width = imagesx ( $new );
$height = imagesy ( $new );

// we need to create temp reduced image so we can get the colors
// in a high bit true color image (png 16,24 bit only)

if ( $is_true_color )
{
    imagetruecolortopalette ( $new, false, 256 );
    image_make ( $new, $ext, $temp_image );
    imagedestroy ( $new );
    $colors = get_rgb ( $temp_image, $ext );
    @unlink ( $temp_image );
    $new = image_get ( $ext, $original_image );
}
else
{
    $colors = get_rgb ( $original_image, $ext );
}

// this creates the cutout layer (2 colors, both will become transparent)

$old = imagecreate ( $width, $height );
imageantialias( $old, true );
imagecolorallocate ( $old, $colors[0]['red'], $colors[0]['green'], $colors[0]['blue'] );
$bg = imagecolorallocate ( $old, $colors[1]['red'], $colors[1]['green'], $colors[1]['blue'] );
imagefilledellipse ( $old, floor ( $width / 2 ), floor ( $height / 2 ), $width, $height, $bg );
imagecolortransparent ( $old, $bg );
imagecopy ( $new, $old, 0, 0, 0, 0, $width, $height );
image_make ( $new, $ext, $output_image );
imagedestroy ( $old );
imagedestroy ( $new );

// this layers both images together, making a nice ellipse/round transparent image cutout

$old = imagecreate ( $width, $height );
$new = image_get ( $ext, $output_image );
$tbg = imagecolorallocate ( $old, $colors[0]['red'], $colors[0]['green'], $colors[0]['blue'] );
imagecopy ( $old, $new, 0, 0, 0, 0, $width, $height );
imagecolortransparent ( $old, $tbg );
image_make ( $old, $ext, $output_image );
imagedestroy ( $old );
imagedestroy ( $new );

/*
* shortcut functions (1,2)
*/

// returns the called image resource

function image_get ( $ext, $name )
{
    switch ( $ext )
    {
        case '.gif' :
        return ( imagecreatefromgif ( $name ) );
        break;
        case '.png' :
        return ( imagecreatefrompng ( $name ) );
        break;
    }
}

// outputs the image named passed to it

function image_make ( $io, $ext, $name )
{
    switch ( $ext )
    {
        case '.gif' :
        imagegif ( $io, $name );
        break;
        case '.png' :
        imagepng ( $io, $name );
        break;
    }
}

// get (2) colors not found in the current image

function get_rgb ( $image, $ext )
{
    $x = 0;
    $colors = array ();
    $img = image_get ( $ext, $image );

    for ( $color = 10; $color <= 250; $color++ )
    {
        if ( imagecolorexact ( $img, $color, $color, $color ) == -1 )
        {
            $colors[] = array ( 'red' => $color, 'green' => $color, 'blue' => $color );

            if ( $x == 1 )
            {
                imagedestroy ( $img );
                return ( $colors );
            }

            $x++;
        }
    }

    imagedestory ( $img );
    return ( $colors );
}

?>

You can try a demo here (SGML) capture a web page, then make multi cutouts example!

http://www.ya-right.com/

mark at freegeekchicago dot org (11-Oct-2005 06:12)

Here is a simple script using imagefilledellipse to created rounded corners on the fly.  It takes color, bg_color, width, height, and placement (i.e. top left, bottom right) as arguments.

<?php
$color = $_REQUEST['color'];
$bg_color = $_REQUEST['bg_color'];

$c_width = $_REQUEST['width'];
$c_height = $_REQUEST['height'];

$placement = $_REQUEST['placement'];

$width = 2 * $c_width;
$height = 2 * $c_height;

// create a blank image
$image = imagecreatetruecolor($c_width, $c_height);

// fill the corner color
$col_ellipse = hex2int($image, $color);

// fill the background color

$bg = hex2int($image, $bg_color);

// fill the background color
imagefill($image, 0, 0, $bg);

// draw the ellipse
//takes (resource image, int cx, int cy, int w, int h, int color)

// bottom right corner
if ($placement == "br") {imagefilledellipse($image, 0, 0, $width, $height, $col_ellipse);}

// top right corner
if ($placement == "tl") {imagefilledellipse($image, $c_width, $c_height, $width, $height, $col_ellipse);}

// top left corner
if ($placement == "tr") {imagefilledellipse($image, 0, $c_height, $width, $height, $col_ellipse);}

// bottom left corner
if ($placement == "bl") {imagefilledellipse($image, $c_width, 0, $width, $height, $col_ellipse);}

// output the picture
header("Content-type: image/png");
imagepng($image);
 
function hex2int($image, $color) {
  $string = str_replace("#","",$color);
  $red = hexdec(substr($string,0,2));
  $green = hexdec(substr($string,2,2));
  $blue = hexdec(substr($string,4,2));

  $color_int = imagecolorallocate($image, $red, $green, $blue);
  return($color_int);
}
?>

You would call it like so:
<img src="round_test.php?
width=50&height=50&color=fffefe&bg_color=99e1e0&placement=tr">

richard at mf2fm dot co dot uk (09-Feb-2005 10:25)

Here is a piece of code using imagefilledellipse which creates a simulation of the current phase of the moon...

Usage is <img src="moon.php?size=100"> which produces an image 100px by 100px wide.  If size is left out, the default is 24px by 24px.

<?php

$mps=2551442.8; // moon phase in seconds (29 days, 12 hours, 44 mins, 2.8 secs)
$position=time()-mktime(10, 32, 0, 1, 25, 2005); // seconds since full moon at 10:32GMT on 25 Jan 2005
$position=($position-$mps*intval($position/$mps))/$mps; // phase from 0 to 1

$position=2*(0.5-$position);
## revised to produce easier to work with...
## $position=1 - full moon
## $position=0 - new moon
## $position=-1 - full moon

$size=$_GET['size'];
if (!is_numeric($size)) $size=24; // width/height in pixels
$moon=imagecreate($size, $size);
$dark=imagecolorallocate($moon, 0, 34, 68); // background colour for moon
$light=imagecolorallocate($moon, 238, 238, 255); // foreground colour for moon
$corona=imagecolorallocatealpha($moon, 153, 153, 153, 64); // edge of moon (semi-transparent)

##
## Make transparent background
##
$background=imagecolorallocatealpha($moon, 0, 0, 0, 127);
imagefill($moon, 0, 0, $background);

##
## Make the moon!
##
imagefilledellipse($moon, round($size/2), round($size/2), $size, $size, $corona);
if ($position>-1/$size AND $position<1/$size) imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $dark); // new moon
elseif (abs($position)>1-1/$size) imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $light); // full moon
elseif ($position>0) {
    imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $light);
    for ($i=0; $i<$size-2; $i++) {
        $xpos=($size-2)/2;
        $xpos=1-($i/$xpos);
        $xpos=sqrt(1-($xpos*$xpos));
        $xpos=($size/2)+($position-0.5)*$xpos*($size-2);
        imagesetpixel($moon, round($xpos), $i+1, $dark);
    }
    for ($i=0; $i<$size; $i++) {
        $set=0;
        for ($j=0; $j<$size; $j++) {
            if (!$set AND imagecolorat($moon, $j, $i)==$dark) $set=1;
            elseif ($set AND imagecolorat($moon, $j, $i)==$light) imagesetpixel($moon, $j, $i, $dark);
        }
    }
}
else {
    imagefilledellipse($moon, round($size/2), round($size/2), $size-2, $size-2, $dark);
    for ($i=0; $i<$size-2; $i++) {
        $xpos=($size-2)/2;
        $xpos=1-($i/$xpos);
        $xpos=sqrt(1-($xpos*$xpos));
        $xpos=($size/2)+($position+0.5)*$xpos*($size-2);
        imagesetpixel($moon, round($xpos), $i+1, $light);
    }
    for ($i=0; $i<$size; $i++) {
        $set=0;
        for ($j=0; $j<$size; $j++) {
            if (!$set AND imagecolorat($moon, $j, $i)==$light) $set=1;
            elseif ($set AND imagecolorat($moon, $j, $i)==$dark) imagesetpixel($moon, $j, $i, $light);
        }
    }
}

##
## And output the picture
##
header ("Content-Type: image/png");
imagepng($moon);
imagedestroy($moon);
?>

dave at corecommunications dot us (11-Oct-2002 02:56)

I needed to draw translucent circles on an existing image, using imagealphablending($image,true);. Turns out that imagefilledellipse seems to do the ellipse by drawing a series of lines from the centroid out to the circumference. Problem with this is that pixels near the center very visibly get drawn multiple times, producing a kind of moire effect. Also, the 0-degree (center to right) line is drawn twice and so is twice as dark the pixel below it.

My workaround was to draw the ellipse solid in a copy of the source image and do an imagecopymerge back into the original.

ivank at 2xtreme dot net (31-Mar-2002 12:31)

Sometimes, you have x1, y1, x2, y2 parameters, but not the center, width, and height. Use this to draw a filled ellipse from your x1, y1, x2, and y2:

ImageFilledEllipse(
$im,
($x1 + round(($x2 - $x1) / 2)),
($y1 + round(($y2 - $y1) / 2)),
($x2 - $x1),
($y2 - $y1),
$color);

harry dot wood at ic dot ac dot uk (20-Jun-2001 12:09)

This draws a rotated ellipse. If you don't want filled ellipses, then you don't need the triangle function.

function triangle($x1,$y1, $x2,$y2, $x3,$y3, $colour) {
   global $im;
   $coords = array($x1,$y1, $x2,$y2, $x3,$y3);
   imagefilledpolygon($im, $coords, 3, $colour);
}

function rotatedellipse($cx, $cy, $width, $height, $rotateangle, $colour, $filled=true) {
   global $im;
   $step=15;
   $cosangle=cos(deg2rad($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);
      $y = ($ox * $sinangle) + ($oy * $cosangle);
 
      if ($nopreviouspoint) {
        $px=$x;
        $py=$y;
        $nopreviouspoint=false;
      }

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