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    imageellipse

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

    imageellipse — Draw an ellipse

    Opis

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

    Draws an ellipse centered at the specified coordinates.

    Parametry

    obraz

    Zasób obrazu, zwrócony przez jedną z funkcji tworzących obrazy, taką jak 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().

    Zwracane wartości

    Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

    Przykłady

    Przykład #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);

    ?>

    Powyższy przykład wyświetli coś podobnego do:

    Output of example : imageellipse()

    Notatki

    Informacja:

    imageellipse() ignores imagesetthickness().

    Zobacz też:

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    User Contributed Notes 3 notes

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    0
    simon_nuttall at hotmail dot com
    17 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);
    }

    ?>
    up
    0
    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);

    ?>
    up
    0
    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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