-- Scriptnaam: Optellen_H6.lua
-- Auteur: Mark Broeren
-- Datum: 07-02-2011

intX = 0
intY = 0
operator = "+"

function doEvent()
    if Keys.newPress.A then
    switchOperator(operator)
        intX = intX+1
    elseif Keys.newPress.B then
        intX = intX-1
    elseif Keys.newPress.X then
        intY = intY+1
    elseif Keys.newPress.Y then
        intY = intY-1
    elseif Keys.newPress.L then
        switchOperator(operator)
    elseif Keys.newPress.R then
        switchOperator(operator)
    end
end

function switchOperator(currentOperator)
    if currentOperator == "+" then
        operator = "-"
    elseif currentOperator == "-" then
        operator = "*"
    elseif currentOperator == "*" then
        operator = "/"
    end
end



function berekenSom(parX, parY)
    intAntwoord = parX + parY
    return intAntwoord
end

function drawScreen()
startDrawing()
    screen.print(SCREEN_UP,0,0,"Press START to stop")
    screen.print(SCREEN_UP,0,10,"Press A, B, X, Y and see what happens")
    screen.print(SCREEN_DOWN,10,100,"x: "..intX)
    screen.print(SCREEN_DOWN,10,110,"y: "..intY)
    screen.print(SCREEN_DOWN,10,120,"Operator: "..operator)
    screen.print(SCREEN_DOWN,10,130,"Het antwoord van je optelling is: "..berekenSom(intX,intY))
stopDrawing()
end

while not Keys.newPress.Start do
    Controls.read()
    doEvent()
    drawScreen()
end