# Documentation

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# `FillColor`, `FillColor2`

Color of areas and surfaces

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## Value Summary

 `FillColor`, `FillColor2` Inherited Color

## Description

`FillColor` determines the color used to fill all types of areas and surfaces. `FillColor2` is used for color blends. `FillColors` is used for objects that need more than one color.

2D objects that have a notion of “area” and 3D objects that have a surface support `FillColor` to determine the primary color to show objects in. If `FillColorType` is set to `Dichromatic`, `FillColor2` sets the second color to blend to.

Functions and primitives displaying more than one object, such as `plot::Bars2d`, use `FillColors` for a list of colors used cyclically.

## Examples

### Example 1

By default, `plot::Hatch` objects are hatched in `RGB ::Red`, the same color used by default for `plot::Function2d`:

```f := plot::Function2d(cos(2*x)+cos(x), x=-PI..PI): h := plot::Hatch(f): plot(h, f)```

To change the color of the hatch, simply set the `"FillColor"`-slot to some other value:

```h::FillColor := RGB::Grey: plot(h, f)```

### Example 2

The default setting for a surface is to have a height-dependent coloring with a linear blend from `FillColor` to `FillColor2`:

```s := plot::Surface([cos(2*u+v), sin(u+2*v), sin(u+v)], u = 0..2*PI, v = 0..2*PI, ULinesVisible = FALSE, VLinesVisible = FALSE): plot(s)```

These colors can be manipulated in the usual way. As an example, we set the transition to a monochrome transition from opaque to transparent:

```s::FillColor := RGB::Green: s::FillColor2 := s::FillColor . [0.0]: plot(s)```

### Example 3

Using a utility function `randrange` that returns random ranges in [0, 1], we can plot random rectangles with random colors:

```randrange := () -> _range(op(sort([frandom(), frandom()]))): plot(plot::Rectangle(randrange(), randrange(), LinesVisible = FALSE, Filled = TRUE, FillPattern = Solid, FillColor = [frandom(), frandom(), frandom()]) \$k=1..20, AxesVisible = FALSE)```