ndtv (version 0.13.4)

layout.center: Functions to center and normalize the coordinates of a network plot within a window.

Description

The layout.center function takes a matrix of coordinates and an x- and y-coordinate range and centers the input coordinates within the range.

The layout.normalize function takes a matrix of coordinates and rescales them to the range (-1,1). If keep.aspect.ratio=FALSE, x- and y-coords are rescaled independently.

Usage

layout.center(coords, xlim, ylim)
layout.normalize(coords, keep.aspect.ratio = TRUE)

Value

The input two column numeric matrix of coordinates with positions transformed.

Arguments

coords

two column numeric matrix of coordinates.

xlim

two element numeric vector giving min and max of x axis

ylim

two element numeric vector giving min and max of y axis

keep.aspect.ratio

boolean, if FALSE, x- and y-axis will be rescaled indpendently

Author

skyebend

Details

These functions are used internally, but can also be called by the user when manipulating coordinates for layouts, especially when the coordinate ranges for a sequence of layouts do not match up well. TODO: add barycenter function, and center on vertex function

Examples

data(McFarland_cls33_10_16_96)
coords<-plot(cls33_10_16_96)

# center layout coords with 100 unit area
layout.center(coords,xlim=c(0,100),ylim=c(0,100))

# rescale layout coords to unit interval
layout.normalize(coords)