plot.TrajSpeedIntervals: Plot method for trajectory speed intervals

In trajr: Animal Trajectory Analysis

Plot method for trajectory speed intervals

Description

Plots speed over time, with intervals of fast and/or slow speed highlighted.

Usage

## S3 method for class 'TrajSpeedIntervals'
plot(
  x,
  slowerThanColour = "red",
  fasterThanColour = "green",
  highlightColor = "#0000FF1E",
  xlab = sprintf("Time (%s)", TrajGetTimeUnits(attr(x, "trajectory"))),
  ylab = sprintf("Speed (%s/%s)", TrajGetUnits(attr(x, "trajectory")),
    TrajGetTimeUnits(attr(x, "trajectory"))),
  type = "l",
  ...
)

Arguments

x	An object of class "SpeedIntervals", as created by TrajSpeedIntervals.
slowerThanColour, fasterThanColour	The colour of the horizontal line plotted at the "slower than" or "faster than" speed. Specify NULL to prevent the line from being plotted.
highlightColor	Colour of the highlight rectangles.
xlab, ylab, type	Plotting parameters with useful defaults.
...	Additional arguments are passed to plot.

See Also

TrajSpeedIntervals

Examples

# Display speed intervals with custom x-axis labels

# Generate and smooth a trajectory
set.seed(3)
trj <- TrajSmoothSG(TrajGenerate(120, fps = 0.5))
# Get speed intervals to be plotted
si <- TrajSpeedIntervals(trj, slowerThan = 0.9, diff = "central")
# Plot, but don't label x axis
plot(si, xlab = "Time (min:sec)", xaxt = "n")
# Work out where x-axis tick marks should be
speeds <- attr(si, "speed") # data frame containing speed over time
p <- pretty(speeds$time)
# Draw x-sxis ticks and labels with custom formatting
axis(1, p, sprintf("%d:%02d", p %/% 60, p %% 60))

trajr documentation built on July 9, 2023, 6:03 p.m.