antipolygon {GEOmap} | R Documentation |
Fill a plot with a color outside the confines of a polygon.
antipolygon(x, y, col = 0, corner=1)
x |
x coordinates of polygon |
y |
y coordinates of polygon |
col |
Fill color |
corner |
Corner on the plot to connect to at the end: 1 = LowerLeft(default) ; 2:UpperLeft 3 = UpperRight; 4=LowerRight |
antipolygon uses par("usr") to determine the external bounds of plotting region. Corners are labels from bottom left counter-clockwise, 1-4.
Used for graphical side effect
If the figure is resized after plotting, filling may not appear correct.
Jonathan M. Lees <jonathan.lees@unc.edu>
polygon, par
x = runif(100) y = runif(100) ######### some data points to plot: plot(x,y) ########### create polygon: pp =list(x=c(0.231,0.316,0.169,0.343,0.311,0.484,0.757, 0.555,0.800,0.563,0.427,0.412,0.203), y=c(0.774,0.622,0.401,0.386,0.138,0.312,0.200,0.459, 0.658,0.624,0.954,0.686,0.813)) polygon(pp) antipolygon(x=pp$x, y=pp$y,col='blue') #### where as this does not look so good plot(x,y) antipolygon(x=pp$x, y=pp$y,col='blue', corner=2)