R Under development (unstable) (2025-07-22 r88445 ucrt) -- "Unsuffered Consequences"
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> library(grid)
> library(gridSVG)

Attaching package: 'gridSVG'

The following objects are masked from 'package:grid':

    linearGradient, pattern, radialGradient

The following object is masked from 'package:grDevices':

    dev.off

> 
> pdf(file = NULL)
> 
> # Define a linear gradient
> lg <- linearGradient(col = c("blue", "red"))
> # Register it 
> registerGradientFill("lingrad", lg)
> 
> # Do the same thing for radial gradient but also set the focus for the
> # radial fill to be off-centre
> rg <- radialGradient(fx = 0.3, fy = 0.3,
+                      col = c("white", "black"), stops = c(0, 2))
> registerGradientFill("radgrad", rg)
> 
> # Create rects that we are going to be gradient filling
> grid.rect(x = 0.2, width = 0.2, height = 0.2, name = "linearfill")
> grid.rect(x = 0.8, width = 0.2, height = 0.2, name = "radialfill")
> 
> # Now apply the gradients
> grid.gradientFill("linearfill", label = "lingrad", alpha = 0.7)
> grid.gradientFill("radialfill", label = "radgrad")
> 
> grid.export("gradient-test.svg")
> dev.off()
null device 
          1 
> 
> proc.time()
   user  system elapsed 
   0.62    0.04    0.65