imageellipse

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

imageellipse — Draw an ellipse

Beschreibung

imageellipse(
    GdImage $image,
    int $center_x,
    int $center_y,
    int $width,
    int $height,
    int $color
): bool

Draws an ellipse centered at the specified coordinates.

Parameter-Liste

image: Ein GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.
center_x: x-coordinate of the center.
center_y: y-coordinate of the center.
width: The ellipse width.
height: The ellipse height.
color: The color of the ellipse. Eine Farbkennung, die mit imagecolorallocate() erzeugt wurde.

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

Changelog

Version	Beschreibung
8.0.0	`image` erwartet nun eine GdImage-Instanz; vorher wurde eine gültige `gd`-Ressource erwartet.

Beispiele

Beispiel #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);

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Anmerkungen

Hinweis:
imageellipse() ignores imagesetthickness().

Siehe auch

imagefilledellipse() - Draw a filled ellipse
imagearc() - Zeichnet einen Bogen

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User Contributed Notes 3 notes

down

simon_nuttall at hotmail dot com ¶

18 years ago

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);
}

?>

down

julian ¶

19 years ago

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);

?>

down

agentyoungsoo at hanmail dot net ¶

21 years ago

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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