Make something move in a specific degree

[superLED]

I would like to be able to move my player, or whatever it may be, in a specific degree.
As for now, I have to make a single function for each degree (usually only up, down, left, right).
But I want a function like "void moveDeg(int degree, int distance)".

How would I make this function?

And also, I am working on a game that features joysticks. Here I get the the X position and the Y position of the analog stick (one of them).
How could I convert those numbers to a degree?

Even though this may only be a math question, I'll let you know that I'm using C++.

I would be grateful for any links and posts. Thanks!

[k1net1k]

sounds like vector based movement

[N64vSNES]

Do you really need angles for this?

Just check the X/Y values of the joystick.

For example:

Code: Select all

if ( JoyX < 0 )
{
     PosX -= movementVal;
}
else if ( JoyX > 0 )
{
     PosX += movementVal;

if ( JoyY < 0 )
{
     PosY -= movementVal;
}
else if ( JoyY > 0 )
{
     PosY+= movementVal;
}

I have no idea exactly what libraries/framework you're using or even what input device you're trying to use. But I find it hard to believe you can only get the angle of the analog stick....

[short]

Vector addition!



If you need further explanation, just ask. You just need to understand a little about vectors.

Hmm my edit seems to have disappeared...

Take a look at this video on vectors, I know you've seen it!!

http://www.youtube.com/watch?v=sDDRZv5QM80

[Falco Girgis]

I'm fairly certain you are misusing the term "degree" here. I was thinking you wanted some sort of rotational mathematics, but what you're asking for does sound like simple vector addition...

[superLED]

Do you really need angles for this?

Just check the X/Y values of the joystick.

For example:

Code: Select all

*code*

I have no idea exactly what libraries/framework you're using or even what input device you're trying to use. But I find it hard to believe you can only get the angle of the analog stick....

I am sing SDL. I am getting the X and Y position of the axis. Something between +3600 to -3600 on each axis.
If I used this code, wouldn't the object move pretty fast if the axis is all the way to 3600?

Vector addition!

*image*

If you need further explanation, just ask. You just need to understand a little about vectors.

Hmm my edit seems to have disappeared...

Take a look at this video on vectors, I know you've seen it!!

http://www.youtube.com/watch?v=sDDRZv5QM80

Thanks for that beauiful paper! I will look into that and see what I can get out of it ^^

I'm fairly certain you are misusing the term "degree" here. I was thinking you wanted some sort of rotational mathematics, but what you're asking for does sound like simple vector addition...

Yes. I think I really ment angle. But that may be a invalid term as well, given that I don't have english as my mother thounge, and I am not that talented with math. But I hope the point of the question was clear anyway.
I will look around for vector addition, and see what I can find. Thanks!

[k1net1k]

I am sing SDL. I am getting the X and Y position of the axis. Something between +3600 to -3600 on each axis.
If I used this code, wouldn't the object move pretty fast if the axis is all the way to 3600?

you could always calculate this a percentage, and then multiply that by the amount of movement you actually want..