export tiling as svg

[Dimitar Misev]

With a query like this we can print the sdoms of tiles in an array:

rasql -q 'select dbinfo(c, "printtiles=1") from test_grey as c' --out string

resulting in a json array of sdom strings like this:

        "tileDomains":
        [
                "[100:149,210:210]"
                "[150:199,0:29]",
                "[150:199,30:59]",
                "[150:199,60:89]",
                ...

The code handling this is in qlparser/qtinfo.cc

It would be very useful to export the tiles as svg that can be visualized, e.g.

rasql -q 'select dbinfo(c, "printtiles=svg") from test_grey as c' --out string

would produce similar to below output (id would contain the tile id)

<svg width="array width" height="array height">
  <rect x="100" y="210" width="50" height="1" id="1232"></rect>
  <rect x="150" y="0" width="50" height="30" id="3223"></rect>
  ...
</svg>

It would also be useful to set various fill colors for each tile, e.g. choose 10-20 colors and rotate them over the rectangles.

This would work only on 2D arrays. 3D and higher dimension would require to generate something like webgl probably.

[Dimitar Misev]

I made a small script which converts the output of dbinfo to svg; execute with vistiles.sh collName.

E.g. for test_grey it produces something like this if you open the svg in inkscape: