Adjusting the transparency of colors.
Wrapper around adjustcolor.
alpha(x, f = 0.5)
x |
A color or a vector with color values. |
f |
A number for adjusting the transparency ranging from 0 (completely transparent) to 1 (not transparent). |
Does not always work for x11 panels.
Other Functions for plotting:
addInterval(),
add_bars(),
add_n_points(),
alphaPalette(),
check_normaldist(),
color_contour(),
dotplot_error(),
drawDevArrows(),
emptyPlot(),
errorBars(),
fill_area(),
getCoords(),
getFigCoords(),
getProps(),
gradientLegend(),
legend_margin(),
marginDensityPlot(),
plot_error(),
plot_image(),
plotsurface(),
sortBoxplot()
emptyPlot(100,100, h=50, v=50)
rect(25,25,75,75, col=alpha('red',f=1))
rect(35,41,63,81, col=alpha(rgb(0,1,.5),f=.25),
border=alpha(rgb(0,1,.5), f=.65), lwd=4)
emptyPlot(1,1, axes=FALSE, main='Tunnel of 11 squares')
center <- c(.75, .25)
mycol <- 'steelblue'
for(i in seq(0,1,by=.1)){
rect(center[1]-center[1]*(1.1-i), center[2]-center[2]*(1.1-i),
center[1]+(1-center[1])*(1.1-i), center[2]+(1-center[2])*(1.1-i),
col=alpha(mycol, f=i), border=mycol, lty=1, lwd=.5, xpd=TRUE)
}
axis(1, at=center[1]-center[1]*(1.1-seq(0,1,by=.1)), labels=seq(0,1,by=.1))
# see alphaPalette for an elaboration of this examplePlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.