Parabolic Motion

[pirodaggar]

Is there an extension that'll simulate parabolic motion - ala a move-it but not just straight lines? Or any way I can manipulate move-it to move the x and y directions independently?

I've tried creating my own parabolic curves in game, but there's always some roundoff error and it screws the system up.

[pirodaggar]

Anyone with any suggestions?

[SEELE]

Have you tried bezier...

[LazyCoder]

If he said he needed a parabola, I assume that's because he needs some sort of projectile-like motion (which from my experiences has been very difficult using bezier curves).

If you want to get rid of the roundoff errors, just use alterable values instead of using x and y coordinates, then after everthing is calculated, set the x and y coordinates to whatever their corresponding alterable values are. That's pulled me out of ALOT of jams.

[BlueFrenzy]

You should make your own movement for this, it's pretty simple and you will get what you want, just by splitting the x and y movements.

Alterable A= horizontal speed
Alterable B= initial vertical speed

if you want to make for example a shot with a starting angle you can do it this way, for a average speed of 5 pixels/second and a gravity speed of 0.2

if bullet.flag 0 is off:
-set flat 0 on
-set alterable A to 5.0*cos(angle)
-set alterable B to -5.0*sin(angle)


and now the movement:
always:
-set bullet.x = bullet.x+alterable A
-add 0.2 to alterable B
-set bullet.y = bullet.y+alterable B

and with this it should work perfectly.


For a perfect movement you should store also the x and y positions.

so:
Alterable X= next x position
Alterable Y= nexy y position

instead of positioning the bullet into the position given above, we do:
add alt A to altX
add alt B to altY

always set position to altX, altY

with this, you should be able to handle decimals correctly.