360 degree movement

Is there an easy way to do 360 degree movement or am I best doing it manually by moving my object each frame using sin and cosine?

If manually, can someone remember the correct instructions? I've almost got it, by moving along the X axis using (+Cosine(angle)*speed) and the Y axis using (-Sine(angle)*speed) but it's not quite right and no amount of fiddling is giving me the correct angles.

You need to set your X and Y position to a an alterable variable, and then do the calculations on that alterable valuable, for example:

Quote:

---

Set X Position to Alterable Value A
Set Y Position to Alterable Value B

Upon Pressing UP
Set Alterable Value A to Alterable Value A + (cos(ANGLE)*SPEED)
Set Alterable Value B to Alterable Value B + (sin(ANGLE)*SPEED)

---

The only thing you have to do after that is to set the Alterable Value A & B to the starting position.

Sorry I probably didn't make myself clear enough. I'm ok getting the X position and updating it, but +Cosine and -Sine isn't moving it correctly. I believe that Cosine and Sine work backwards on a computer screen (the angle goes anti-clockwise) and 0 degrees is due east. So 90 degrees is straight up etc. I've done this in the past and as far as I can remember, there's a fairly simple calculation to correct this to computer screen coordinates, but X=X+(Cosin(angle)*speed) and Y=Y-(Sin(angle)*speed) isn't working correctly.

-Cosine, +Sine... :crazy:

By the way, I hope you're not directly using X/Y coordinates, since they are integral. Decimals will be lost, so if your player's angle is 10°, he'll move in the same direction as he would at 0° (To prevent that, use alterable values as X/Y positions.)

Ah ok, I didn't know that, so I see was izac was getting at. Ok, thanks :)

Hmm ok, is there any tutorial or example code for this? I only got MFM yesterday so it's all new to me - although I've done lots of programming in other languages, I'm clearly doing something wrong here.

At the moment I'm setting the alterable value A and B to the bullet's X and Y position. I then use -cosine and +sine to move them each frame, and then put those values into the bullet's position? It's not working correctly and the angles are still wrong, for example, 225 degrees is now up/right.

You set the X and Y position to the value A and B, not the other way round, so all the calculations must be made to the value A and B.

Yeah sorry that's what I meant. I store the calculated position in A and B, then each frame, update those values and then position the object at that position by setting it's X coord to A and it's Y coord to B. Does that sound correct?

Quote:

---

Originally Posted by Farflame

Hmm ok, is there any tutorial or example code for this?

---

You can do this numerous ways, even using Vector Movement. There are plenty of exmaples lying around. Here is one that I know of off hand:

360 Shooting Example

stephen1980

Thanks :)

No problem. :)

stephen1980