Php/docs/function.imageline

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imageline

(PHP 4, PHP 5, PHP 7)

imagelineDraw a line


Description

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

Draws a line between the two given points.


Parameters

image
An image resource, 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.


Examples

Example #1 Drawing a thick line

<?phpfunction 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);}?>

See Also