Retrieve currently visible map canvas content.

mapCanvas.saveAsImage(filename = tempfile(), format = "png", ...)

Arguments

filename	name of the file to be written to disk (if none is specified, the image is written to a temporary file).
format	the image format in which the canvas should be exported and transferred. While this is primarily relevant for how images are saved to disk, choice of a lossy format (such as `jpg`) can also affect the values of the `RasterBrick` returned by the function.
...	low-level parameters (such as `host` and `auth`) to be passed on to `qgisremote()`

A RasterBrick object specifying the RGB values of the returned image, with the projection and extent set to that of the map canvas.

Retrieves the map canvas in the given image format, saves it to disk at the given path, and returns the image data as a RasterBrick object.

## imagedata <- mapCanvas.saveAsImage()
## raster::plotRGB(imagedata)