imageopenpolygon

(PHP 7 >= 7.2.0, PHP 8)

imageopenpolygon — Draws an open polygon

Açıklama

imageopenpolygon(
    GdImage $image,
    array $points,
    int $num_points,
    int $color
): bool

Alternative signature (as of PHP 8.0.0)

imageopenpolygon(GdImage $image, array $points, int $color): bool

imageopenpolygon() draws an open polygon on the given image. Contrary to imagepolygon(), no line is drawn between the last and the first point.

Değiştirgeler

görüntü

imagecreatetruecolor() gibi bir görüntü oluşturma işlevinden dönen bir GdImage nesnesi.

points

An array containing the polygon's vertices, e.g.:

points[0]	= x0
points[1]	= y0
points[2]	= x1
points[3]	= y1

num_points

Total number of points (vertices), which must be at least 3.

If this parameter is omitted as per the second signature, points must have an even number of elements, and num_points is assumed to be count($points)/2.

color

imagecolorallocate() işlevi le oluşturulmuş bir renk tanıtıcı.

Dönen Değerler

Başarı durumunda true, başarısızlık durumunda false döner.

Sürüm Bilgisi

Sürüm:	Açıklama
8.0.0	`görüntü` değiştirgesinde artık bir GdImage nesnesi aktarmak gerekiyor; evvelce resource türünde bir değer gerekirdi.

Örnekler

Örnek 1 imageopenpolygon() example


<?php
// Create a blank image
$image = imagecreatetruecolor(400, 300);

// Allocate a color for the polygon
$col_poly = imagecolorallocate($image, 255, 255, 255);

// Draw the polygon
imageopenpolygon($image, array(
        0,   0,
        100, 200,
        300, 200
    ),
    3,
    $col_poly);

// Output the picture to the browser
header('Content-type: image/png');

imagepng($image);
imagedestroy($image);
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

Ayrıca Bakınız

imagepolygon() - Çokgen çizer

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User Contributed Notes 1 note

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-1

marco at oostende dot nl ¶

5 years ago


In case you want to use an open polygon but are stuck with a PHP version prior to 7.2, a solution may be to 'backplot' your array to its original start. Say you have an array of pixels (below seperated by commas)

<?php
$arr = array();
for ($i = 0; $i < count($pixels); $i++) {
    $pixel = explode(',', $pixels[$i]);
    if (($pixel[0] > 0) && ($pixel[1] > 0)) {
        $arr[] = $pixel[0];
        $arr[] = $pixel[1];
    }
}
imagepolygon($im, $arr, (count($arr) / 2), $otcolor);
?>

you can replace this by something like

<?php
$arr = array();
for ($i = 0; $i < count($pixels); $i++) {
    $pixel = explode(',', $pixels[$i]);
    $arr[] = $pixel[0];
    $arr[] = $pixel[1];
}
// imageopenpolygon($im, $arr, (count($arr) / 2), $otcolor) is not possible, so...
for ($i = (count($pixels)-1); $i >= 0; $i--) {
    $pixel = explode(',', $pixels[$i]);
    $arr[] = $pixel[0];
    $arr[] = $pixel[1];
}
imagepolygon($im, $arr, (count($arr) / 2), $otcolor);
?>

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