input.lua

local V = require('vector')
local state = {idle = {}, pressed = {}}
local current = {
  state = state.idle,
}
local lines = {}

local M = {
  state = state,
  current = current,
  lines = lines,
  tap = nil,
}

function M.load()
  love.mousepressed = current.state.mousepressed
  love.mousereleased = current.state.mousereleased
  love.touchpressed = current.state.touchpressed
  love.touchreleased = current.state.touchreleased
end

function M.update(dt)
  for _, line in pairs(lines) do
    line[1] = line[1] + dt
  end
end

function M.getSwipe()
  local line = table.remove(lines)
  if line ~= nil then
    local l = line[2]
    return {x = l[3] - l[1], y = l[4] - l[2]}
  else
    return nil
  end
end

function state.idle.mousepressed(x, y, button)
  if button == 1 then
    current.state = state.pressed
    current.start = {x, y}
    love.mousepressed = nil
    love.mousereleased = current.state.mousereleased
    love.touchpressed = nil
    love.touchreleased = nil
  end
end

function state.pressed.mousereleased(x2, y2, button)
  if button == 1 then
    local x1 = current.start[1]
    local y1 = current.start[2]
    if V.sqMag({x = x2 - x1, y = y2 - y1}) > 25 then
      table.insert(lines, {0, {x1, y1, x2, y2}})
    else
      M.tap = {x=x2, y=y2}
    end
    current.state = state.idle
    current.start = nil
    love.mousepressed = current.state.mousepressed
    love.mousereleased = nil
    love.touchpressed = current.state.touchpressed
    love.touchreleased = nil
  end
end

function state.idle.touchpressed(_, x, y)
  current.state = state.pressed
  current.start = {x, y}
  love.mousepressed = nil
  love.mousereleased = nil
  love.touchpressed = nil
  love.touchreleased = current.state.touchreleased
end

function state.pressed.touchreleased(_, x2, y2)
  local x1 = current.start[1]
  local y1 = current.start[2]
  if V.sqMag({x = x2 - x1, y = y2 - y1}) > 25 then
    table.insert(lines, {0, {x1, y1, x2, y2}})
  else
    M.tap = {x=x2, y=y2}
  end
  current.state = state.idle
  current.start = nil
  love.mousepressed = current.state.mousepressed
  love.mousereleased = nil
  love.touchpressed = current.state.touchpressed
  love.touchreleased = nil
end


return M