DrawContourlines {OCplus} | R Documentation

## Draw and label a set of pre-calculated isolines

### Description

This function draws and labels isolines computed by `contourLines`, though the labelling is done very clumsily and with a specialized application in mind.

### Usage

    DrawContourlines(x, label = FALSE, cex = 0.7, vfont = c("sans serif", "bold"), ...)

### Arguments

`x` | a list of isolines as produced by `contourLines`.
`label` | a logical value indicating whether to label the isolines.
`cex` | size of labels
`vfont` | a vector font specification for the labels as in `contour`.
`...` | extra arguments to `lines`

### Details

This routine is used by `Tornadoplot` and `Volcanoplot` to draw and label isolines that were computed via contourLines and afterwards transformed. The problem is that all the nice options that `contour` has for labelling isolines are not avaiable independently, so this function uses the following crude procedure that kind of works for the intended applications:

- isoline completely left of zerolabel the leftmost point;

- isoline completely right of zerolabel the rightmost point;

- isoline crosses zero horizontallylabel the topmost point.

Hopefully, one of these days someone will come up with a nice general-purpose function for doing all the nifty stuff that `contour` offers.

### Author(s)

A. Ploner

### See Also

`contour`, `contourLines`, `Tornadoplot`

[Package OCplus version 1.64.0 Index]