vrana Fri Dec 26 16:10:10 2003 EDT
Modified files:
/phpdoc/en/reference/image/functions imageline.xml
Log:
imagelinethick function
Index: phpdoc/en/reference/image/functions/imageline.xml
diff -u phpdoc/en/reference/image/functions/imageline.xml:1.4
phpdoc/en/reference/image/functions/imageline.xml:1.5
--- phpdoc/en/reference/image/functions/imageline.xml:1.4 Wed Feb 12 12:49:07
2003
+++ phpdoc/en/reference/image/functions/imageline.xml Fri Dec 26 16:10:09 2003
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/image.xml, last change in rev 1.2 -->
<refentry id="function.imageline">
<refnamediv>
@@ -21,8 +21,42 @@
<function>imageline</function> draws a line from
<parameter>x1</parameter>, <parameter>y1</parameter> to
<parameter>x2</parameter>, <parameter>y2</parameter> (top left is
- 0, 0) in image im of color <parameter>color</parameter>.
+ 0, 0) in image <parameter>image</parameter> of color
<parameter>color</parameter>.
</para>
+ <example>
+ <title>Drawing a thick line</title>
+ <programlisting role="php">
+<![CDATA[
+<?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);
+}
+
+?>
+]]>
+ </programlisting>
+ </example>
<para>
See also <function>imagecreate</function> and
<function>imagecolorallocate</function>.
