How do I change the colour and thickness of the curve plotted with the grid.curve function? I've tried adding arguments to the function parameters but they're not supported. Can I somehow change the default par()?
library(grid)
plot.new()
#main viewport
vp=viewport(x=0.5,y=0.5,width=1, height=1)
pushViewport(vp)
#Circle
grid.circle(x=0.5, y=0.5, r=0.4)
grid.curve(0.5,0.9,0.9,0.5,curvature=arcCurvature(90),ncp=10)