persp.linim: Perspective View of Pixel Image on a Linear Network

In spatstat.linnet: Linear Networks Functionality of the 'spatstat' Family

Perspective View of Pixel Image on a Linear Network

Description

Given a pixel image on a linear network, generate a perspective view.

Usage

 ## S3 method for class 'linim'
persp(x, ..., main,
                       grid = TRUE, ngrid = 10,
                       col.grid = "grey", col.base = "white",
                       neg.args=list(), warncross=FALSE)

Arguments

x	Pixel image on a linear network (object of class "linim").
...	Arguments passed to persp.default to control the perspective view, or passed to segments or polygon to control the appearance of the vertical panes.
main	Main title for the plot.
grid	Logical value indicating whether to draw a rectangular grid at height zero, to assist the perception of perspective.
ngrid	Number of grid lines to draw, if grid=TRUE.
col.grid	Colour of grid lines, if grid=TRUE.
col.base	Colour of base plane, if grid=TRUE.
neg.args	Optional list of arguments passed to polygon when displaying negative values of the function.
warncross	Logical value indicating whether to issue a warning if two segments of the network cross each other (which causes difficulty for the algorithm).

Details

The pixel values are interpreted as the spatially-varying height of a vertical surface erected on each segment of the linear network. These surfaces are drawn in perspective view.

This style of plot is often attributed to Okabe and Sugihara (2012).

Value

(Invisibly) the perspective transformation matrix, as described in the help for persp.default.

Author(s)

\adrian

and Greg McSwiggan.

References

Okabe, A. and Sugihara, K. (2012) Spatial Analysis Along Networks. John Wiley and Sons, New York.

See Also

persp.linfun

Examples

  if(interactive()) {
    Z <- density(chicago, 100)
  } else {
    X <- runiflpp(10, simplenet)
    Z <- density(X, 0.1)
  }
  persp(Z, theta=30, phi=20)

spatstat.linnet documentation built on Sept. 20, 2024, 5:06 p.m.