Appkit: /util.lua — code sample

Code

--[[
    An assortment of useful utility functions.

]]--

Appkit.Util = Appkit.Util or {}
local Util = Appkit.Util

local Application = stingray.Application
local Pad1 = stingray.Pad1
local Vector3 = stingray.Vector3

local simulate_touch = false

function Util.is_pc()
    return Application.platform() == Application.WIN32
            or Application.platform() == Application.MACOSX
            or Application.platform() == Application.WEB
            or Application.platform() == Application.LINUX
end

function Util.is_console()
    return Application.platform() == Application.PS4
            or Application.platform() == Application.XB1
end

function Util.is_android()
    return Application.platform() == Application.ANDROID
end

function Util.is_ios()
    return Application.platform() == Application.IOS
end

function Util.is_mobile()
    return Util.is_android() or Util.is_ios()
end

function Util.set_simulated_touch_enabled(is_enabled)
    stingray.SimulatedTouchPanel.set_enabled(is_enabled)
    simulate_touch = is_enabled
end

function Util.use_touch()
    local p = Application.platform()
    return p == Application.ANDROID or p == Application.IOS or (simulate_touch and p == Application.WIN32)
end

function Util.touch_interface()
    if Util.use_touch() and Application.platform() == Application.WIN32 then
        return stingray.SimulatedTouchPanel
    else
        return stingray.TouchPanel1
    end
end

--Returns whatever argument is appropriate for the current platform.
function Util.plat(pc, xb1, touch, ps4)
    if Util.use_touch() then return touch end

    local p = Application.platform()
    if p == Application.XB1 then return xb1 end
    if p == Application.PS4 then return ps4 end
    if p == Application.WIN32 and pc == nil and Pad1 and Pad1.active() then
        if Pad1.type() == "windows_ps4_controller" then return ps4 end
        if Pad1.type() == "xbox_controller" then return xb1 end
    end
    return pc
end

function Util.location(touch, id)
    -- Scale the touch input to the back buffer size.
    local back_buffer_w, back_buffer_h = Application.back_buffer_size()
    local touch_resolution = touch.resolution()
    local scale = Vector3(back_buffer_w / touch_resolution.x, back_buffer_h / touch_resolution.y, 1.0)
    local scaled_coordinates = Vector3.multiply_elements(touch.location(id), scale)
    return scaled_coordinates
end

return Util