I usually express a margin as a percentage of the total extent. For example to
add 10% you'd do something like:
where pntext is the extent of your points layer and mapext is your map extent...
dx = .05 * (pntext->maxx - pntext->minx);
dy = .05 * (pntext->maxy - pntext->miny);
mapext->minx = pntext->minx - dx;
mapext->maxx = pntext->maxx + dx;
mapext->miny = pntext->miny - dy;
mapext->maxy = pntext->maxy + dy;
Then let MapServer pad the appropriate dimension based on your image aspect.
Steve
>>> Ben Sims <[EMAIL PROTECTED]> 05/07/07 10:48 AM >>>
Hello to all,
I'm getting confused on how to correctly set 'margins' on my maps in a simple
application. I currently get the extents of the dynamically generated
pointsLayer using:
pointsLayer->getExtent();
I then add/subtract arbitary margin values (0.75 for x, 0.5 for y). This works
well enough at the country level, but at a wider (often global) scale, the
points are cut off by the edge of the image.
What I would like to do is simply extend the extent viewed by the width of the
largest possible point. However, I don't know how to convert the size of the
points (in pixels) to a margin usable by $map->setExtents().
Any help much appreciated,
Benjamin
PS: Also, the Mapserver main doc site is down, which makes it hard to browse
documentation.
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