Homebrew [Help] [LÖVEPotion] How do I make it so that my character won't move past the screen?

[DutchyDutch]

Hi, yesterday I started developing in LovePotion for the 3DS. In about 20 hours I've already got the basics down... except for a few things. This glitch is one of them.

The problem is this:
I managed to make a top down game with a moving character and a scrolling background. When the dpad is pressed, the character moves up, and the BG moves down. This gives a scrolling BG effect. However, sometimes, my character moves past the screen, so you can't see him anymore. How do I fix this?

Source code:

Spoiler

function love.load()

background = love.graphics.newImage('background.png')
youngBoy = love.graphics.newImage('youngboy.png')
youngboyx = 0
youngboyy = 0
backgroundx = 0
backgroundy = 0
end


function love.draw()
love.graphics.draw(background, backgroundx, backgroundy)
love.graphics.draw(youngBoy, youngboyx, youngboyy)


end
function love.update(dt)

if love.keyboard.isDown("right") then
youngboyx = youngboyx + 1.1
end

if love.keyboard.isDown("left") then
youngboyx = youngboyx - 1.1
end
if love.keyboard.isDown("up") then
youngboyy = youngboyy -1.1
end
if love.keyboard.isDown("down") then
youngboyy = youngboyy + 1.1
end

if love.keyboard.isDown("down") then
backgroundy = backgroundy - 3.1
end



if love.keyboard.isDown("up") then
backgroundy = backgroundy + 3.1
end


function love.keypressed(key)
if key == 'start' then
love.event.quit()
end
end

If it's really necessary I could provide a short video of it pretty soon, just tell me.
Thanks for reading this!

 

[c4388354]

before adding the 1.1, do a check to see if the current x or y position is lower then a certain value (like 240) if it is then add the 1.1, if not then don't do anything.

same when subtracting, make sure that the value is higher then a certain value (like 2), if it is then subtract the 1.1, if not then don't do anything.

maybe try something like:

if love.keyboard.isDown("right") then
    if youngboyx < 240: youngboyx = youngboyx + 1.1
end

also, you can combine the "youngboyy = youngboyy + 1.1" and "backgroundy = backgroundy - 3.1" part into one if statement.

example:
before:

if love.keyboard.isDown("down") then
youngboyy = youngboyy + 1.1
end

if love.keyboard.isDown("down") then
backgroundy = backgroundy - 3.1
end

after:

if love.keyboard.isDown("down") then
    if youngboyx < 240:
        youngboyy = youngboyy + 1.1
        backgroundy = backgroundy - 3.1

edit: fix codebox spacing

 

[DutchyDutch]

before adding the 1.1, do a check to see if the current x or y position is lower then a certain value (like 240) if it is then add the 1.1, if not then don't do anything.

same when subtracting, make sure that the value is higher then a certain value (like 2), if it is then subtract the 1.1, if not then don't do anything.

<snip>

That worked perfectly! Thanks!