pv.param: A protovis mark parameter.
In leeper/rwebvis: Create graphics for the web from R.

A protovis mark parameter.

1	pv.param(name, data, data.name, value, scale, scale.min, scale.max, xmin, xmax, ymin, ymax, default, quote=TRUE)

`name`	The name of mark parameter.
`data`	The data used in the parameter settings.
`data.name`	The name of the field in the dataset.
`value`	An explicit value for the parameter.
`scale`	Whether the value or data should be scaled. Can be "linear", "log", or ...
`scale.min`	The minimum scaled value (or defaults to zero) in pixels.
`scale.max`	The maximum scaled value (or defaults to the height/width of the visualization) in pixels.
`xmin`	The minimum x value for the scaled output.
`xmax`	The maximum x value for the scaled output.
`ymin`	The minimum y value for the scaled output.
`ymax`	The maximum y value for the scaled output.
`default`	The default value for the parameter.
`quote`	Whether character values should be quoted.