ref: f059563b9d53d3e63e2d580ed61868153f24c481
dir: /sys/src/libdraw/drawrepl.c/
#include <u.h> #include <libc.h> #include <draw.h> int drawreplxy(int min, int max, int x) { int sx; sx = (x-min)%(max-min); if(sx < 0) sx += max-min; return sx+min; } Point drawrepl(Rectangle r, Point p) { p.x = drawreplxy(r.min.x, r.max.x, p.x); p.y = drawreplxy(r.min.y, r.max.y, p.y); return p; }