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IMAGELINE(3)								 1							      IMAGELINE(3)

imageline - Draw a line

SYNOPSIS
bool imageline (resource $image, int $x1, int $y1, int $x2, int $y2, int $color) DESCRIPTION
Draws a line between the two given points. PARAMETERS
o $ image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3). o $x1 - x-coordinate for first point. o $y1 - y-coordinate for first point. o $x2 - x-coordinate for second point. o $y2 - y-coordinate for second point. o $color - The line color. A color identifier created with imagecolorallocate(3). RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Drawing a thick line <?php function imagelinethick($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); } ?> SEE ALSO
imagecreatetruecolor(3), imagecolorallocate(3). PHP Documentation Group IMAGELINE(3)

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