# Fills with randomized symbols¶

It is possible to generate fills by randomly repeating a symbol in the polygons to be filled. Please refer to the equivalent SLD chapter for details on the meaning of the various options.

## Simple random distribution¶

Here is an example distributing up to 50 small “slash” symbols in a 100x100 pixel tile (in case of conflicts the symbol will be skipped), enabling random symbol rotation), and setting the seed to “5” to get a distribution different than the default one:

```* {
fill: symbol("shape://slash");
:fill {
size: 8;
stroke: blue;
stroke-width: 4;
stroke-linecap: round;
};
stroke: black;
fill-random: grid;
fill-random-seed: 5;
fill-random-rotation: free;
fill-random-symbol-count: 50;
fill-random-tile-size: 100;
}
```

Random distribution of a diagonal line

## Thematic map using point density¶

Randomized distributions can also be used for thematic mapping, for example, here is the SLD for a version of topp:states that displays the number of inhabitantìs varying the density of a random point distribution:

```* {
fill: symbol("circle");
stroke: black;
fill-random: grid;
fill-random-tile-size: 100;

:fill {
size: 2;
fill: darkgray;
};
/* @title low */
[PERSONS < 2000000] {
fill-random-symbol-count: 50;
};
/* @title mid */
[PERSONS >= 2000000] [PERSONS < 4000000] {
fill-random-symbol-count: 150;
};
/* @title high */
[PERSONS >= 4000000] {
fill-random-symbol-count: 500;
}
}
```

Thematic map via point density approach