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PHP : Function Reference : Image Functions : imageellipse

imageellipse

Draw an ellipse (PHP 4 >= 4.0.6, PHP 5)
bool imageellipse ( resource image, int cx, int cy, int width, int height, int color )

Draws an ellipse centered at the specified coordinates.

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

cx

x-coordinate of the center

cy

y-coordinate of the center

width

The ellipse width

height

The ellipse height

color

The color of the ellipse. A color identifier created with imagecolorallocate()

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example1006.imageellipse() 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 ellipse
imageellipse($image, 200, 150, 300, 200, $col_ellipse);

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

?>

The above example will output something similar to:


Notes

Note:

This function requires GD 2.0.2 or later.

Related Examples ( Source code ) » imageellipse


Code Examples / Notes » imageellipse

agentyoungsoo

When you wana use "ImageEllipse" function
in under GD 2.0.2 version, you can use "ImageArc" like bellow
----------------------------------------------------
$file_name = "test.png";
$screen_x = 300;
$screen_y = 200;
$x1 = $screen_x / 2;
$y1 = $screen_y / 2;
$radius = 30;
$image = ImageCreate($screen_x, $screen_y);
$black = ImageColorAllocate($image, 0,0,0);
ImageArc($image, $x1, $y1, $radius , $radius , 0, 360, $black);
ImagePng($image, $file_name);
ImageDestroy($image);
----------------------------------------------------


simon_nuttall

This is an optimised and bug fixed version of nojer at yahoo dot com's rotatedellipse function. I've changed it so that the arguments are compatible with imageellipse. See notes on imagearc for original version.
<?php
function rotatedellipse($im, $cx, $cy, $width, $height, $rotateangle, $colour, $filled=false) {
 // modified here from nojer's version
 // Rotates from the three o-clock position clockwise with increasing angle.
 // Arguments are compatible with imageellipse.
 $width=$width/2;
 $height=$height/2;
 // This affects how coarse the ellipse is drawn.
 $step=3;
 $cosangle=cos(deg2rad($rotateangle));
 $sinangle=sin(deg2rad($rotateangle));
 // $px and $py are initialised to values corresponding to $angle=0.
 $px=$width * $cosangle;
 $py=$width * $sinangle;
 
 for ($angle=$step; $angle<=(180+$step); $angle+=$step) {
   
   $ox = $width * cos(deg2rad($angle));
   $oy = $height * sin(deg2rad($angle));
   
   $x = ($ox * $cosangle) - ($oy * $sinangle);
   $y = ($ox * $sinangle) + ($oy * $cosangle);

   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);
   }
   $px=$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);
}
?>


julian

if you want to display an ellipse in the upper left corner of an image, you can easily calculate the corresponding cx and cy values. this example will draw an ellipse having the same width and height as the image.
<?php
$ellipse_width = 100;
$ellipse_height = 200;
$ellipse_cx = ($ellipse_width / 2);
$ellipse_cy = ($ellipse_height / 2);
$img_x = $ellipse_width;
$img_y = $ellipse_height;
$img = imagecreate($img_x, $img_y);
$bg = imagecolorallocate($img, 255,255,255);
$ellipse_color = imagecolorallocate($img, 0, 0, 0);
imageellipse($img, $ellipse_cx, $ellipse_cy, $ellipse_width, $ellipse_height, $ellipse_color);
header("Content-type: image/png");
imagepng($img);
imagedestroy($img);
?>


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