default_overlay {HilbertCurve} | R Documentation

## Default color overlay for adding new layers

### Description

Default color overlay for adding new layers

### Usage

    default_overlay(r0, g0, b0, r, g, b, alpha = 1)

### Arguments

`r0` | red channel for the layers that are already in the plot.
`g0` | green channel for the layers that are already in the plot.
`b0` | blue channel for the layers that are already in the plot.
`r` | red channel for the new layer
`g` | green channel for the new layer
`b` | blue channel for the new layer
`alpha` | alpha channel for the new layer

### Details

The default overlay is (take red channel for example) `r*alpha + r0*(1-alpha)`.

### Value

A list which contains overlayed RGB colors (values between 0 and 1).

### Author(s)

Zuguang Gu <z.gu@dkfz.de>

### See Also

Color overlay function is always used in `hc_layer,HilbertCurve-method` or `hc_layer,GenomicHilbertCurve-method`.

### Examples

    # red (1, 0, 0) overlay to the grey (0.5, 0.5, 0.5) with 0.5 transparency
    default_overlay(1, 0, 0, 0.5, 0.5, 0.5, 0.5)

[Package HilbertCurve version 1.20.0 Index]