iraster | R Documentation |
iraster
adds a raster image as an iObj to the given iPlot.
Position in the plot is specified by bottom-left and top-right points
of the image.
iraster(x1, y1, x2, y2, img, ..., plot = iplot.cur())
x1, y1, x2, y2 |
coordinates of the bottom-left (x1, y1) and
top-right (x2, y2) corner. Alternatively, |
img |
image to draw. It can be either a raster, file name, binary connection or a raw vector containing an image in a common image format such as PNG or JPEG. If it is a raster, then the raster is first encoded into PNG format and passed as raw vector. |
... |
additional arguments that will be passed to
|
plot |
parent plot for the image |
The current implementation uses Java's ImageIO API to read the
image, so the supported formats will depend on your Java
implemetation. Raster objects (i.e., of class "raster"
,
"nativeRaster"
), matrices and arrays) are simply passed to
png::writePNG(img)
so for anything other than computationally
constructed objects it is more efficient to use the encoded image.
Resulting iObject.
iobj.opt
## very silly example ... iplot(0:20/20, 0:20/20) ## get a sample image (R logo) from the png package fn <- system.file("img", "Rlogo.png", package="png") ## put this image behind all points iraster(0, 0, 1, 1, fn, layer=-2) ## you can use a raster but it's less eficient ## this one goes to the top layer where iObjs reside normally iraster(0, 0, 0.5, 0.5, png::readPNG(fn))
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