http://lemuria.org/dragoneye/index.php?action=history&feed=atom&title=Add_random_points
Add random points - Revision history
2026-05-03T22:11:53Z
Revision history for this page on the wiki
MediaWiki 1.42.1
http://lemuria.org/dragoneye/index.php?title=Add_random_points&diff=3066&oldid=prev
Tom at 10:22, 17 September 2021
2021-09-17T10:22:16Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:22, 17 September 2021</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><pre></ins></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>?></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>?></div></td></tr>
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Tom
http://lemuria.org/dragoneye/index.php?title=Add_random_points&diff=3065&oldid=prev
Tom at 10:20, 17 September 2021
2021-09-17T10:20:20Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:20, 17 September 2021</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
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Tom
http://lemuria.org/dragoneye/index.php?title=Add_random_points&diff=1509&oldid=prev
Tom at 09:02, 27 November 2019
2019-11-27T09:02:52Z
<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:02, 27 November 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><<del style="font-weight: bold; text-decoration: none;">syntaxhighlight lang="PHP"</del>></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><<ins style="font-weight: bold; text-decoration: none;">source</ins>></div></td></tr>
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Tom
http://lemuria.org/dragoneye/index.php?title=Add_random_points&diff=1508&oldid=prev
Tom: Created page with "Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405 <syntaxhighlight lang="PHP"> <?php /* This..."
2019-11-27T08:59:41Z
<p>Created page with "Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405 <syntaxhighlight lang="PHP"> <?php /* This..."</p>
<p><b>New page</b></p><div>Save this as add_random_points.php and use it as outlined in the video tutorial here: https://www.patreon.com/posts/31650405<br />
<br />
<syntaxhighlight lang="PHP"><br />
<?php<br />
<br />
/*<br />
<br />
This script adds random deviation to the polygons in a geojson file<br />
intended to be used as described in https://www.patreon.com/posts/31650405<br />
<br />
(C)2019 by Tom Vogt <tom@lemuria.org><br />
<br />
Support me on Patreon:<br />
https://www.patreon.com/notveryprofessional<br />
<br />
*/<br />
<br />
$max_deviation = 0.2;<br />
$max_abs = 0.02;<br />
$min_distance = 0.05;<br />
<br />
$iterations = 4;<br />
<br />
if ($argc < 2 ) {<br />
exit( "Usage: add_random_points.php <filename.json>\n" );<br />
}<br />
<br />
// FIXME: This script created a few cases of self-intersection that must be fixed manually<br />
// in QGIS: Vector -> Geometry Tools -> Check Validity<br />
<br />
$cells = json_decode(file_get_contents($argv[1]), true);<br />
<br />
<br />
for ($i=0; $i<$iterations; $i++) {<br />
$lookup = array();<br />
<br />
foreach ($cells['features'] as &$cell) {<br />
$points = $cell['geometry']['coordinates'][0];<br />
<br />
$prev = null;<br />
$newpoints = array();<br />
<br />
foreach ($points as $point) {<br />
if ($prev) {<br />
$distance = sqrt(pow($prev[0] - $point[0], 2) + pow($prev[1] - $point[1], 2));<br />
if ($distance == 0) continue;<br />
<br />
if ($distance > $min_distance) {<br />
$id_a = $prev[0]."-".$prev[1];<br />
$id_b = $point[0]."-".$point[1];<br />
<br />
if (isset($lookup[$id_a."--".$id_b])) {<br />
$newpoints[] = $lookup[$id_a."--".$id_b];<br />
} elseif (isset($lookup[$id_b."--".$id_a])) {<br />
$newpoints[] = $lookup[$id_b."--".$id_a];<br />
} else {<br />
$x = ($prev[0]+$point[0])/2.0;<br />
$y = ($prev[1]+$point[1])/2.0;<br />
<br />
$r = mt_rand() / mt_getrandmax(); // 0-1<br />
$r = ($r+1) / 2; // 0.5 - 1.0<br />
<br />
// if we define dx=x2-x1 and dy=y2-y1, then the normals are (-dy, dx) and (dy, -dx).<br />
$dx = $point[0] - $x;<br />
$dy = $point[1] - $y;<br />
<br />
if (mt_rand() / mt_getrandmax() < 0.5) {<br />
$x_off = -$dy;<br />
$y_off = $dx;<br />
} else {<br />
$x_off = $dy;<br />
$y_off = -$dx;<br />
}<br />
<br />
$x_off *= $r * $max_deviation;<br />
$x_off = max(min($x_off, $max_abs), $max_abs*-1);<br />
<br />
$y_off *= $r * $max_deviation;<br />
$y_off = max(min($y_off, $max_abs), $max_abs*-1);<br />
<br />
$p = array($x + $x_off, $y + $y_off);<br />
$lookup[$id_a."--".$id_b] = $p;<br />
$newpoints[] = $p;<br />
}<br />
}<br />
}<br />
$newpoints[] = $point;<br />
$prev = $point;<br />
}<br />
$cell['geometry']['coordinates'][0] = $newpoints;<br />
}<br />
}<br />
<br />
echo json_encode($cells, JSON_PRETTY_PRINT);<br />
<br />
?><br />
</syntaxhighlight></div>
Tom