PHP: imageellipse - Manual

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Last updated: Sat, 27 Jan 2007

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# imageellipse

(PHP 4 >= 4.0.6, PHP 5)

imageellipse -- Draw an ellipse

## Описание

bool imageellipse ( resource image, int cx, int cy, int width, int height, int color )

Draws an ellipse centered at the specified coordinates.

## Список параметров

`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()

## Возвращаемые значения

Возвращает `TRUE` в случае успешного завершения или `FALSE` в случае возникновения ошибки.

## Примеры

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);
?>`

Результатом выполнения данного примера будет что-то подобное:

## Примечания

> Замечание: This function requires GD 2.0.2 or later.

## Смотрите также

imagefilledellipse()
imagearc()

add a note User Contributed Notes
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);
----------------------------------------------------`
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Last updated: Sat, 27 Jan 2007
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