imageline

PHP 4, PHP 5, PHP 7, PHP 8

imageline - Draw a line

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imageline( GdImage$image, int$x1, int$y1, int$x2, int$y2, int$color ): bool

Draws a line between the two given points.

Parameters

image: A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
x1: x-coordinate for first point.
y1: y-coordinate for first point.
x2: x-coordinate for second point.
y2: y-coordinate for second point.
color: The line color. A color identifier created with imagecolorallocate.

Return Values

Returns true on success or false on failure.

Changelog

Version	Description
8.0.0	image expects a GdImage instance now; previously, a resource was expected.

Related Functions

Example of imageline

Show all examples for imageline

<?php
function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1)
{
    /* this way it works well only for orthogonal lines
    imagesetthickness($image, $thick);
    return imageline($image, $x1, $y1, $x2, $y2, $color);
    */
    if ($thick == 1) {
        return imageline($image, $x1, $y1, $x2, $y2, $color);
    }
    $t = $thick / 2 - 0.5;
    if ($x1 == $x2 || $y1 == $y2) {
        return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color);
    }
    $k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q
    $a = $t / sqrt(1 + pow($k, 2));
    $points = array(
        round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),
        round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),
        round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),
        round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),
    );
    imagefilledpolygon($image, $points, 4, $color);
    return imagepolygon($image, $points, 4, $color);
}

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imageline

Parameters

Return Values

Changelog

Related Functions

Example of imageline

Function imageline:

Image Processing and GD Functions

Most used PHP functions