ggcontour {ggplot} | R Documentation

## Grob function: contours

### Description

Create a grob to display contours of a 3D data set.

### Usage

    ggcontour(plot = .PLOT, aesthetics=list(), ..., data=NULL)

### Arguments

`plot` | the plot object to modify
`aesthetics` | named list of aesthetic mappings, see details for more information
`...` | other options, see details for more information
`data` | data source, if not specified the plot default will be used

### Details

Aesthetic mappings that this grob function understands:

- `x`:x position (required)
- `y`:y position (required)
- `z`:z position (required)

These can be specified in the plot defaults (see `ggplot`) or in the `aesthetics` argument. If you want to modify the position of the points or any axis options, you will need to add a position scale to the plot. These functions start with `ps`, eg. `pscontinuous` or `pscategorical`

Other options:

- `nlevels`: number of contours to draw
- `levels`: contour positions
- `...`: other aesthetic parameters passed to `grob_path`

### Author(s)

Hadley Wickham <h.wickham@gmail.com>

### See Also

`gg2density`

### Examples

    volcano3d <- data.frame(expand.grid(x = 1:nrow(volcano), y=1:ncol(volcano)), z=as.vector(volcano))
    p <- ggplot(volcano3d, aesthetics=list(x=x,y=y,z=z))
    ggcontour(p)
    ggcontour(p, colour="red")
    ggcontour(p, nlevels=3)
    ggcontour(ggtile(p, list(fill=z)))

[Package ggplot version 0.4.2 Index]