a

libdraw/drawrepl.c

@@ -0,0 +1,23 @@
+#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;
+}
+