Contour plot of pixel image
Generates a contour plot of a pixel image.
## S3 method for class 'im'
contour(x, ..., main,
axes=FALSE, add=FALSE, col=par("fg"),
clipwin=NULL, show.all=!add, do.plot=TRUE)x |
Pixel image to be plotted.
An object of class |
main |
Character string to be displayed as the main title. |
axes |
Logical. If |
add |
Logical. If |
col |
Colour in which to draw the contour lines.
Either a single value that can be interpreted as a colour value,
or a |
clipwin |
Optional. A window (object of class |
... |
Other arguments passed to |
show.all |
Logical value indicating whether to display all plot elements
including the main title, bounding box, and (if
|
do.plot |
Logical value indicating whether to actually perform the plot. |
This is a method for the generic contour function,
for objects of the class "im".
An object of class "im" represents a pixel image;
see im.object.
This function displays the values of the pixel image x
as a contour plot on the current plot device,
using equal scales on the x and y axes.
The appearance of the plot can be modified
using any of the arguments listed in the help for
contour.default.
Useful ones include:
Number of contour levels to plot.
Whether to label the contour lines with text.
Colour, type, and width of contour lines.
See contour.default for a full list of these arguments.
The defaults for any of the abovementioned arguments
can be reset using spatstat.options("par.contour").
If col is a colour map (object of class "colourmap",
see colourmap) then the contours will be plotted in
different colours as determined by the colour map.
The contour at level z will be plotted
in the colour col(z) associated with this level in the colour map.
none.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
Rolf Turner r.turner@auckland.ac.nz
and Ege Rubak rubak@math.aau.dk
# an image Z <- setcov(owin()) contour(Z, axes=TRUE) contour(Z) co <- colourmap(rainbow(100), range=c(0,1)) contour(Z, col=co, lwd=2)
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