hc_centered_text-HilbertCurve-method {HilbertCurve} | R Documentation

## Add text to the center of the block

### Description

Add text to the center of the block

### Usage

    ## S4 method for signature 'HilbertCurve'
    hc_centered_text(object, ir = NULL, labels, x1 = NULL, x2 = NULL, gp = gpar(), ...)

### Arguments

`object` | A `HilbertCurve-class` object.
`ir` | an `IRanges` object that contains positions which correspond to text. The middle points of the intervals will be the positions of the text.
`labels` | text corresponding to intervals in `ir`.
`x1` | if start positions are not integers, they can be set by `x1`.
`x2` | if end positions are not integers, they can be set by `x2`.
`gp` | graphic parameters for text. It should be specified by `gpar`.
`...` | pass to `grid.text`. E.g. you can set text justification by `just` here.

### Details

If the interval is long enough that it represents as a block in the 2D space, the corresponding label is put approximately at center (or at least inside) of the block.

Please use `hc_text,HilbertCurve-method` directly.

### Value

`NULL`

### Author(s)

Zuguang Gu <z.gu@dkfz.de>

### See Also

It is used in `hc_map,GenomicHilbertCurve-method` to put chromosome names in the center of chromosomes.

### Examples

    hc = HilbertCurve(1, 10)
    hc_rect(hc, x1 = c(1, 3, 7), x2 = c(3, 7, 10), gp = gpar(fill = 2:5))
    hc_centered_text(hc, x1 = 1, x2 = 3, labels = "A")
    hc_centered_text(hc, x1 = 3, x2 = 7, labels = "B")
    hc_centered_text(hc, x1 = 7, x2 = 10, labels = "C")

[Package HilbertCurve version 1.20.0 Index]