(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
imageellipse — Draw an ellipse
$image,$center_x,$center_y,$width,$height,$colorDraws an ellipse centered at the specified coordinates.
imageEin GdImage -Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor() , zurückgegeben wurde.
center_xx-coordinate of the center.
center_yy-coordinate of the center.
widthThe ellipse width.
heightThe ellipse height.
colorThe color of the ellipse. Eine Farbkennung, die mit imagecolorallocate() erzeugt wurde.
| Version | Beschreibung |
|---|---|
| 8.0.0 |
image erwartet nun eine
GdImage -Instanz; vorher wurde eine gültige
gd-Ressource erwartet.
|
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:
Hinweis:
imageellipse() ignores imagesetthickness() .
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);
}
?>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($img);
?>When you wana use "ImageEllipse" function
in under GD 2.0.2 version, you can use "ImageArc" like bellow
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$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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