code: 9ferno

ref: c52aa4936cee1c8a41c53aefe629a25de3560387
dir: /libdraw/drawrepl.c/

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#include "lib9.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;
}