[kaznelson]

Originally Posted by NiLuJe

Are we talking the angle at which point horizontal becomes a diagonal? I would assume 45°
In any case, hope you like trig: https://github.com/koreader/koreader....lua#L307-L337

I made these sectors: 15°*2 for vertical swipe, 15° for diagonal swipe, and 60°*2 for horizontal swipe.
Please tell me, is it possible to do this with user patch?

Spoiler:

--[[--
Compares `current_tev` with `initial_tev`.

The first boolean argument `simple` results in only four directions if true.

@return (direction, distance) pan direction and distance
--]]
function Contact:getPath(simple, diagonal, initial_tev)
    initial_tev = initial_tev or self.initial_tev

    local x_diff = self.current_tev.x - initial_tev.x
    local y_diff = self.current_tev.y - initial_tev.y
    local direction = nil
    local distance = math.sqrt(x_diff*x_diff + y_diff*y_diff)
    if x_diff ~= 0 or y_diff ~= 0 then
        local v_direction = y_diff < 0 and "north" or "south"
        local h_direction = x_diff < 0 and "west" or "east"
        if (not simple
            and math.abs(y_diff) > 1.732*math.abs(x_diff)
            and math.abs(y_diff) < 3.732*math.abs(x_diff))
           or (simple and diagonal)
        then
            direction = v_direction .. h_direction
        elseif (math.abs(x_diff) > 0.577*math.abs(y_diff)) then
            direction = h_direction
        else
            direction = v_direction
        end
    end
    return direction, distance
end