Drawing a circle - take 3 (polygon)

Exercise Type: Implementation

Instructions

Write a function to repeat the plotting of our earlier circle: Drawing a circle.

name	Circle()
arguments	x=0 : x coordinate of origin
	y=0 : y coordinate of origin
	r=1 : radius
	by=5 : the angle step size in degrees
	col=1 : the fill color of the circle polygon
	border=1 : the circle polygon’s border color
	lty=1 : the circle polygon’s border type
	lwd=1 : the circle polygon’s border width
return	Either nothing, or a 2D matrix with x and y coordinates

• Similar to the earlier version (Drawing a circle), try to implement this exercise using vectorization principles only, without using either for or while loops!

• Instead of using the return() function to indicate the return value from the function, try out invisible(), instead!

Important: do not draw the basic plot with the function, assume that people will call to it, before calling to Circle(). The plot above should be redrawable with these instructions:

plot(0,0)
Circle(x=0, y=0, r=1, by=5, col="#4466FF44")