plotPoints: Plot EventData/PolyData as Points

In PBSmapping: Mapping Fisheries Data and Spatial Analysis Tools

Plot EventData/PolyData as Points

Description

Plot EventData/PolyData, where each unique EID or (PID, SID) describes a point.

Usage

plotPoints (data, xlim = NULL, ylim = NULL, projection = FALSE,
            plt = c(0.11, 0.98, 0.12, 0.88), polyProps = NULL,
            cex = NULL, col = NULL, pch = NULL, axes = TRUE,
            tckLab = TRUE, tck = 0.014, tckMinor = 0.5 * tck, ...)

Arguments

data	EventData or PolyData to plot (required).
xlim	range of X-coordinates.
ylim	range of Y-coordinates.
projection	desired projection when PolySet lacks a projection attribute; one of "LL", "UTM", or a numeric value. If Boolean, specifies whether to check polys for a projection attribute.
plt	four element numeric vector (x1, x2, y1, y2) giving the coordinates of the plot region measured as a fraction of the figure region. Set to NULL if mai in par is desired.
polyProps	PolyData specifying which points to plot and their properties. par parameters passed as direct arguments supersede these data.
cex	vector describing character expansion factors (cycled by EID or PID).
col	vector describing colours (cycled by EID or PID).
pch	vector describing plotting characters (cycled by EID or PID).
axes	Boolean value; if TRUE, plot axes.
tckLab	Boolean vector (length 1 or 2); if TRUE, label the major tick marks. If given a two-element vector, the first element describes the tick marks on the x-axis and the second element describes those on the y-axis.
tck	numeric vector (length 1 or 2) describing the length of tick marks as a fraction of the smallest dimension. If tckLab = TRUE, these tick marks will be automatically labelled. If given a two-element vector, the first element describes the tick marks on the x-axis and the second element describes those on the y-axis.
tckMinor	numeric vector (length 1 or 2) describing the length of tick marks as a fraction of the smallest dimension. These tick marks can not be automatically labelled. If given a two-element vector, the first element describes the tick marks on the x-axis and the second element describes those on the y-axis.
...	additional par parameters, or the arguments main, sub, xlab, or ylab for the title function.

Details

This function clips data to xlim and ylim before plotting. It only adds PolyData containing X and Y columns.

The function creates a blank plot when polys equals NULL. In this case, the user must supply both xlim and ylim arguments. Alternatively, it accepts the argument type = "n" as part of ..., which is equivalent to specifying polys = NULL, but requires a PolySet. In both cases, the function's behaviour changes slightly. To resemble the plot function, it plots the border, labels, and other parts according to par parameters such as col.

For additional help on the arguments cex, col, and pch, please see par.

Value

PolyData consisting of the PolyProps used to create the plot.

Note

To satisfy the aspect ratio, this plotting routine resizes the plot region. Consequently, par parameters such as plt, mai, and mar will change. When the function terminates, these changes persist to allow for additions to the plot.

Author(s)

Nicholas M. Boers, Staff Software Engineer
Jobber, Edmonton AB
Last modified Rd: 2013-04-10

See Also

addPoints, combineEvents, convDP, findPolys, locateEvents.

Examples

local(envir=.PBSmapEnv,expr={
  oldpar = par(no.readonly=TRUE)
  #--- load the data (if using R)
  if (!is.null(version$language) && (version$language=="R"))
    data(nepacLL,surveyData,envir=.PBSmapEnv)
  #--- plot a map
  plotMap(nepacLL, xlim=c(-136, -125), ylim=c(48, 57))
  #--- add events
  addPoints(surveyData, col=1:7)
  par(oldpar)
})

PBSmapping documentation built on Sept. 30, 2024, 9:21 a.m.