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imagelinethick function
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@147348 c90b9560-bf6c-de11-be94-00142212c4b1
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1 changed files with 36 additions and 2 deletions
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- $Revision: 1.5 $ -->
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<!-- splitted from ./en/functions/image.xml, last change in rev 1.2 -->
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<refentry id="function.imageline">
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<refnamediv>
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<function>imageline</function> draws a line from
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<parameter>x1</parameter>, <parameter>y1</parameter> to
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<parameter>x2</parameter>, <parameter>y2</parameter> (top left is
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0, 0) in image im of color <parameter>color</parameter>.
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0, 0) in image <parameter>image</parameter> of color <parameter>color</parameter>.
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</para>
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<example>
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<title>Drawing a thick line</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1) {
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/* this way it works well only for orthogonal lines
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imagesetthickness($image, $thick);
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return imageline($image, $x1, $y1, $x2, $y2, $color);
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*/
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if ($thick == 1) {
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return imageline($image, $x1, $y1, $x2, $y2, $color);
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}
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$t = $thick / 2 - 0.5;
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if ($x1 == $x2 || $y1 == $y2) {
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return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color);
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}
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$k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q
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$a = $t / sqrt(1 + pow($k, 2));
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$points = array(
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round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),
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round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),
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round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),
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round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),
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);
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imagefilledpolygon($image, $points, 4, $color);
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return imagepolygon($image, $points, 4, $color);
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}
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?>
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]]>
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</programlisting>
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</example>
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<para>
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See also <function>imagecreate</function> and
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<function>imagecolorallocate</function>.
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