SVGImport.wiki
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#summary Importing an SVG into Hedgewars
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= Introduction =
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This is a quick and dirty description of converting an SVG into hedgewars HWMAP format.  It is not at all pretty. Hopefully someone will make a prettier process.  It currently makes use of Inkscape, vim, perl, g++ and a bit of manual labour.  It looks best in 0.9.18 which makes use of the variable brush size (the examples below use the smallest size, or 16px wide)
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= Details =
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Open Inkscape.
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Go to File->Inkscape Preferences and make sure that
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    * SVG Output->Allow relative coordinates is unchecked
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    * Transforms->Store transformation  is set to Optimized
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Open an SVG. Ideally one of simple line art, without too much use of fill or filters.
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1) Select all in the image and choose ungroup, then combine all paths in the drawing (select them, then choose Path->Combine). 
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Note. I had some difficulty doing that with some images even after repeated use of ungroup. I ended up just going into the SVG file and deleting all the groups.  This usually happens if there are filters in place. Removing all the <g> tags in the SVG is faster than cleaning up the filters in inkscape.
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Also, some paths might be worth eliminating altogether.  In order to get a better idea of what it'll look like, try: View->Display Mode->Outline
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2) Click on the path, and choose dimensions for W and H that would look good in the game (no more than 4096 for W and 2048 for H).  The Lock button may be helpful here
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3) Go to File->Document Properties and specify 4096 for W and 2048 for H.  You may want to then reposition the art to be more centred vertically or horizontally.
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4) Save and Quit
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6) Open in an editor and verify there is one path. change the path ID attribute to id="base" - this is to work around a bug in the current stable Inkscape extensions tool which was crashing it.  Make sure all those groups are removed.
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7) open the file in Inkscape again, Click on the path again, then go to Extensions->Modify Path->Flatten Beziers and flatten out the curves to your taste. Default of 10 seems fine. 
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8) Save and Quit again
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9) Edit the file, and delete everything but the path data.  You should have a one-line file starting with something like  M1234.3 456.78L3298.3 9023.34 and so on.  The coordinates should now be rounded unless you plan to handle that yourself in some way.  Here is a vim one-liner to do it.
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{{{:s/[0-9][0-9.]*/\=float2nr(floor(submatch(0)*1))/g}}}
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If instead you have a format like M 1234.678,9875.323 2345.0,123.45  - you'll want to convert if you want to try the crude script in (10) - otherwise a smarter script would be needed.  Here's a Vim one-liner for that syntax {{{s/\(\d\) \(\d\)/\1 L\2/g}}}  and {{{s/,/ /g}}}
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10) Convert the path data.  Here is a crude script to do that.  Note this one uses a line size of 1 (that's the 0x01 business).
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If you want larger lines you can pick anything between 0x01 and 0x3F.  That's 16-636.  See the map format wiki page.
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{{{
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#!/usr/bin/perl
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# just a one-line list of points. at least, it had better be one-line
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open FILE, $ARGV[0];
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while(<FILE>)
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{
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    chomp;
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    s/([LM])(\d+) (\d+)\s*/point($1,$2,$3)/eg;
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    print;
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} 
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sub point
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{
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    ($t, $x, $y) = @_;
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    $x+=0;
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    $y+=0; # just in case
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    printf("%c%c%c%c%c",$x>>8,$x&0xff,$y>>8,$y&0xff,($t=~m/M/)?(0x80|0x01):0x01);
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    return;
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}
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}}}
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{{{script pointdata > hwpointdata}}}
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11) qCompress the data.
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{{{g++ -I /usr/include/qt4 -I /usr/include/qt4/QtCore qcompress.cpp -lQtCore}}}
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{{{
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#include <QFile>
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#include <QByteArray>
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using namespace std;
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int main(int argc, char **argv) 
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{
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    QFile fromFile(argv[1]);
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    QFile toFile(argv[2]);
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    if(fromFile.open(QIODevice::ReadOnly) && toFile.open(QIODevice::WriteOnly))
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    {
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        toFile.write(qCompress(fromFile.readAll()));
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    }
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}
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}}}
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{{{./a.out hwpointdata hwpointdata.Z}}}
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12) Convert to base64 and you're done!
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{{{base64 -w0 hwpointdata.Z > mynewhedgewars.hwmap}}}
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Enjoy.
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Here are some example hwmap files from the process above.  They look better in 0.9.18.
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http://m8y.org/hw/drawn/