# 3. Attributes

#### Size (Column\<f64>)

* f64 -> f64

#### Color (Column\<piet::Color>)

* \[-1.5, 3.2, ..] -> ColorMap (continuous)
* \[0, 5, 2, ..] -> user cast to categorical -> ColorCycle (categorical)
* \["a", "b", ..] -> user cast to categorical -> ColorCycle (categorical)
* \["red", "green", ..] -> arbitrary color
* None

When string, it supports css color strings with extensions.

Example of supported colors:

```
transparent
gold
rebeccapurple
lime
#0f0
#0f0f
#00ff00
#00ff00ff
rgb(0,255,0)
rgb(0% 100% 0%)
rgb(0 255 0 / 100%)
rgba(0,255,0,1)
hsl(120,100%,50%)
hsl(120deg 100% 50%)
hsl(-240 100% 50%)
hsl(-240deg 100% 50%)
hsl(0.3333turn 100% 50%)
hsl(133.333grad 100% 50%)
hsl(2.0944rad 100% 50%)
hsla(120,100%,50%,100%)
hwb(120 0% 0%)
hwb(480deg 0% 0% / 100%)
hsv(120,100%,100%)
hsv(120deg 100% 100% / 100%)
```

```
match dtype {
  Float64 => ColorMap,
  Categorical or Integer => ColorCycle,
  String => ColorName, 
}
```

#### Shape (Column\<Shape>)

* i64, string -> ShapeCycle (categorical)
* string -> shape name


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