PHP: imageellipse

Description

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

imageellipse() draws an 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. The color of the ellipse is specified by color.

Замечание: This function was added in PHP 4.0.6 and requires GD 2.0.2 or later which can be obtained at http://www.boutell.com/gd/

Пример 1. 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); ?>

imageellipse

simon_nuttall at hotmail dot com
07-Jun-2006 01:36


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 06:23


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
04-Dec-2002 08:56


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); 

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