ref: fbf9f131b5931defb02ff08d54d1e088d9f51a15
dir: /sys/src/cmd/plot/libplot/circ.c/
#include "mplot.h"
void circ(double xc, double yc, double r){
Point p;
int rad;
p.x=SCX(xc);
p.y=SCY(yc);
if (r < 0)
rad=SCR(-r);
else
rad=SCR(r);
ellipse(screen, p, rad, rad, 0, getcolor(e1->foregr), ZP);
}