Vehicle template: /player_hud.lua — code sample

Code

local Util = require 'core/appkit/lua/util'
local SimpleProject= require 'core/appkit/lua/simple_project'
Project.PlayerHud = Project.PlayerHud or {}
local PlayerHud = Project.PlayerHud

local Vector3 = stingray.Vector3
local Vector3Box = stingray.Vector3Box
local Keyboard = stingray.Keyboard

local hud_level = nil

-- Scaleform is an engine plugin and is required for this file.
if scaleform == nil then 
    PlayerHud = {
        init_hud = function() end,
                update   = function() end,
                shutdown = function() end,
                exit_level = function() end,
                get_motion_input = function() assert(false) end,
                check_toggle_camera = function() return false end,
                check_powerbrake = function() return 0 end
            }
    return PlayerHud
end

function PlayerHud:on_custom_event(evt)
    if evt.name == "analog_stick" then
        if evt.data.action == "forward" then
            local move = Vector3(evt.data.x, -evt.data.y,0)
            self.input.move:store(Vector3.normalize(move))
        end
        if evt.data.action == "turn"  then
            local pan = Vector3(evt.data.x, evt.data.y, 0)
            self.input.pan:store(Vector3.normalize(pan))
        end
    end

    if evt.name == "button_click" then
        if evt.data.action == "start_brake" then
            self.input.powerbrake = 1
        end

        if evt.data.action == "stop_brake" then
            self.input.powerbrake = 0
        end

        if evt.data.action == "toggle_camera" then
            self.input.toggle_camera = true
        end
        if evt.data.action == "return" then
            self.input.exit_level = true
        end
    end
end

function PlayerHud:init_hud()
    --Used for mobile hud controls but it simplifies the logic in player if they're always available.
    self.input = {
        pan = Vector3Box(Vector3(0, 0, 0)),
        move = Vector3Box(Vector3(0, 0, 0)),
        toggle_camera = false,
        powerbrake = 0,
        exit_level = false
    }

    --On PC show only the dpad hud.
    if Util.is_pc() then 
        local current_level = SimpleProject.level
        scaleform.Stingray.load_project_and_scene("content/ui/template_hud.s2d/template_hud");
        hud_level = current_level
    end

    --On Touch devices display touch specific hud
    if Util.use_touch() then
        local current_level = SimpleProject.level
        scaleform.Stingray.load_project_and_scene("content/ui/vehicle_mobile_hud.s2d/vehicle_mobile_hud");
        hud_level = current_level

        --Register a custom listener to check for different controls.
        local custom_listener = PlayerHud.custom_listener
        custom_listener = scaleform.EventListener.create(custom_listener, function (e) PlayerHud.on_custom_event(PlayerHud,e) end)
        PlayerHud.custom_listener = custom_listener
        scaleform.EventListener.connect(custom_listener, scaleform.EventTypes.Custom)
    end 
end

function PlayerHud:shutdown(level)
    if scaleform then
        scaleform.Stingray.unload_project();
        if Util.use_touch() then
            PlayerHud.custom_listener = nil
        end
        hud_level = nil
    end
end

local function update_pc_hud()
    local event = {
        eventId = scaleform.EventTypes.Custom,
        name = nil,
        data = nil
    }
    --Controlling HUD features through custom messages and key presses.
    if stingray.Keyboard.pressed(stingray.Keyboard.button_id("w"))  then
        event.name = "keypressed"
        event.data = "up"
        scaleform.Stage.dispatch_event(event)
    elseif stingray.Keyboard.released(stingray.Keyboard.button_id("w"))  then
        event.name = "keyreleased"
        event.data = "up"
        scaleform.Stage.dispatch_event(event)
    end

    if stingray.Keyboard.pressed(stingray.Keyboard.button_id("a")) then
        event.name = "keypressed"
        event.data = "left"
        scaleform.Stage.dispatch_event(event)
    elseif stingray.Keyboard.released(stingray.Keyboard.button_id("a")) then
        event.name = "keyreleased"
        event.data = "left"
        scaleform.Stage.dispatch_event(event)
    end

    if stingray.Keyboard.pressed(stingray.Keyboard.button_id("s"))  then
        event.name = "keypressed"
        event.data = "down"
        scaleform.Stage.dispatch_event(event)
    elseif stingray.Keyboard.released(stingray.Keyboard.button_id("s"))  then
        event.name = "keyreleased"
        event.data = "down"
        scaleform.Stage.dispatch_event(event)
    end

    if stingray.Keyboard.pressed(stingray.Keyboard.button_id("d")) then
        event.name = "keypressed"
        event.data = "right"
        scaleform.Stage.dispatch_event(event)
    elseif stingray.Keyboard.released(stingray.Keyboard.button_id("d")) then
        event.name = "keyreleased"
        event.data = "right"
        scaleform.Stage.dispatch_event(event)
    end
end

function PlayerHud:update(dt)
    if Util.is_pc() then
        update_pc_hud()
    end
end

--Implement handlers for touch controls to override appkit input_mapper and project specific controls.
function PlayerHud:get_motion_input()
    local input = self.input
    return {move = input.move:unbox(), pan = input.pan:unbox()}
end

function PlayerHud:check_toggle_camera()
    local ret = self.input.toggle_camera
    self.input.toggle_camera = false
    return ret
end

function PlayerHud:check_powerbrake()
    return self.input.powerbrake
end

function PlayerHud:exit_level()
    local ret = self.input.exit_level
    self.input.exit_level = false
    return ret
end

return PlayerHud