LÖVE

Posted: **Mon Jan 02, 2012 9:57 pm**

Please tell me that you have used the good ol '*dt' in there. It goes way too fast even on easy.

Posted: **Tue Jan 03, 2012 1:53 pm**

Ruirize wrote:Please tell me that you have used the good ol '*dt' in there. It goes way too fast even on easy.

I didn't use dt. I will fix that, sorry.

Posted: **Tue Jan 03, 2012 2:58 pm**

It's strange. If I use dt in velocity, I can't make it constant. It changes from time to time. Wth?

Here's the code:

    dv = difficulty * dt
    if love.keyboard.isDown("left") then
       velx = -dv
       vely = 0
    end
    if love.keyboard.isDown("right") then
       velx = dv
       vely = 0
    end
    if love.keyboard.isDown("up") then
       vely = -dv
       velx = 0
    end
    if love.keyboard.isDown("down") then
       vely = dv
       velx = 0
   end
       x = x + velx
       y = y +  vely

It should be constant, but it isn't.

Posted: **Tue Jan 03, 2012 3:02 pm**

dt changes all the time, and that's the way it's supposed to be. Or is that not what you meant?

Posted: **Tue Jan 03, 2012 3:02 pm**

dt is not meant to be constant. It's smaller in faster machines, and bigger in slower machines. Your code must take that into account.

Posted: **Tue Jan 03, 2012 3:04 pm**

So I won't use dt then. I want the velocity to be constant.

Posted: **Tue Jan 03, 2012 3:08 pm**

gordebak wrote:So I won't use dt then. I want the velocity to be constant.

That's why you should use dt.

The faster the machine, the smaller dt. If you multiply the velocity with dt, it remains constant.

If you have 10 FPS, dt will be 0.1, if you have 100 FPS, dt will be 0.01. If you multiply the speed in seconds by dt, you get the speed in frames.

pixels/second * seconds/frame = pixels/frame.

EDIT: also, it would be nice if after X levels, you get an extra life.

Posted: **Tue Jan 03, 2012 3:11 pm**

But it doesn't stay constant on my machine. Sometimes it goes faster if I use dt. Isn't it a bit strange?

Edit: Sorry if I sound like a moron. Look at the code please, what am I doing wrong?

And you get an extra life on level 10.

Posted: **Tue Jan 03, 2012 4:39 pm**

The problem might be that you are calculating velx and vely correctly ... but you never use them.

Code: Select all

x = x + dv
y = y +  dv

I take this should be

Code: Select all

x = x + velx
y = y +  vely

Or something along those lines.

PS: Please, indent your code. It will help you program much easily. In addition, it's a common courtesy if you are going to ask others to review your code. Kindof similar to brushing up your teeth between eating smelly cheese and going to the dentist.

Posted: **Tue Jan 03, 2012 4:41 pm**

Actually I use velx and vely. I just wrote it here incorrectly.

Edit: Corrected the code.

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