Code snippets for the Corona SDK Tutorial: Game controllers and axes (https://coronalabs.com/blog/2013/09/24/tutorial-controllers-and-axis)

part4.lua

-- Since controllers don't generate constant values, but simply events when
-- the values change, we need to set a movement amount when the event happens,
-- and also have the game loop continuously apply it

-- We can also calculate our rotation angle here

local function moveRedPlayer()

    -- Set the .isMovingX and .isMovingY values in our event handler
    -- If this number isn't 0 (stopped moving), move the player
    if ( redPlayer.isMovingX ~= 0 ) then
        redPlayer.x = redPlayer.x + redPlayer.isMovingX
    end
    if ( redPlayer.isMovingY ~= 0 ) then
        redPlayer.y = redPlayer.y + redPlayer.isMovingY
    end

    -- Rotation code
    if ( redPlayer.rotationDistance > 0.1 ) then
        if ( redPlayer.thisAngle > redPlayer.lastAngle ) then
            redPlayer.rotation = redPlayer.rotation + redPlayer.rotationDistance
        else
            redPlayer.rotation = redPlayer.rotation - redPlayer.rotationDistance
        end
    end
end

Runtime:addEventListener( "enterFrame", moveRedPlayer )

local function moveGreenPlayer()

    if ( greenPlayer.isMovingX ~= 0 ) then
        greenPlayer.x = greenPlayer.x + greenPlayer.isMovingX
    end
    if ( greenPlayer.isMovingY ~= 0 ) then
        greenPlayer.y = greenPlayer.y + greenPlayer.isMovingY
    end
    if ( greenPlayer.rotationDistance > 0.1 ) then
        if ( greenPlayer.thisAngle > greenPlayer.lastAngle ) then
            greenPlayer.rotation = greenPlayer.rotation + greenPlayer.rotationDistance
        else
            greenPlayer.rotation = greenPlayer.rotation - greenPlayer.rotationDistance
        end
    end
end

Runtime:addEventListener( "enterFrame", moveGreenPlayer )