imageellipse

(PHP 4 >= 4.0.6, PHP 5)

imageellipse — Draw an ellipse

Description

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

Example #1 imageellipse() example


<?php

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

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

// Fill the background with the color selected above.
imagefill($image, 0, 0, $bg);

// 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 image.
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.


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
16-Jan-2005 11:23


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);



?>

agentyoungsoo at hanmail dot net
05-Dec-2002 01:56


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); 

----------------------------------------------------

add a note

imagefill

imagedestroy

Last updated: Fri, 22 Aug 2008