Method x2i

tools/streamline.rs:217–219

(&self, x: f64)

    }

    fn x2i(&self, x: f64) -> usize {
        ((x - self.min_x) / self.stride) as usize
    }

    fn y2j(&self, y: f64) -> usize {
        ((y - self.min_y) / self.stride) as usize