git: 9front

ref: ebf508780708c4b171db37ffa24d6a00f495b025
dir: /sys/src/libdraw/drawrepl.c/

View raw version 
#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;
}