some help on circular player movement

[mrmonkey]

H All,

I have a problem. I have a planet which is completely circular and I have a player who has to be able to run around this planet. When they jump they are to be pulled down to the surface of the planet. so essentially its a platform game but running around completely circular planets.

any idea of how i would do this within mmf as going in and coding up the trig for it seems like a nightmare of epic proportions.

thanks greatly for any help.

just to recap.


player moves around the planet's circumference using the left/right arrows
pressing jump sends the player along the normalised (?) angle to the planet's surface
upon reaching the maximum jump hight the player drops back towards the planet surface.

[Ogglop]

You could do something like this:
Always
-set X position to X("planet")+(Cos(rotationValue("player")))*distanc eValue("player")
-set Y position to Y("planet")+(Sin(rotationValue("player")))*distanc eValue("player")

where rotationValue can be edited to make yor player move, use an alterable value or a counter, and distanceValue is the number of pixels away from the center of the planet.

when player holds right
-add one to rotationValue
when player holds left
-sub one from rotationValue

For moving:
rotationValue<0
-set rotationValue to 360
rotationValue>360
-set rotationValue to 0

I´m no good at custom platform movements but a basic idea for jumping(should work with pretty much any custom jump, a more dynamic one would be much better..):

start of frame (or whatever)
-set surfaceValue to a number(equal of pixels from center of planet to surface)
distanceValue < surfaceValue
-set distanceValue to value of surfaceValue
-set flag1 off

player press jump and flag1 is off
-set flag1 on
-set jumpValue to 100 (or someThing)

jumpValue > 0 and flag1 is on
-sub 1 from jumpValue
-add 1 to distanceValue

jumpValue = 0 and flag1 is on
-sub 1 from distanceValue