<p>I am trying to write one. You can see the code at <a href="https://github.com/sri-soham/mapnik-utf8grid-tester">https://github.com/sri-soham/mapnik-utf8grid-tester</a> . I am able to generate tiles for the given x, y, z but the utf grid is coming up empty.</p>
<p>As I see it, the problem is with writing features to grid with grid-renderer. Relevant code being</p>
<pre><code>mapnik::grid_renderer<mapnik::grid> ren(m_map, my_grid, 1.0, 0, 0);
std::vector<mapnik::layer> const& layers = m_map.layers();
ren.apply(layers[0], attributes);
</code></pre>
<p>in this file <a href="https://github.com/sri-soham/mapnik-utf8grid-tester/blob/master/map_tile.cpp">https://github.com/sri-soham/mapnik-utf8grid-tester/blob/master/map_tile.cpp</a> .</p>
<p>I am new to mapnik and c++. Any pointers in getting this right?</p>
<p>Thanks</p>

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