Moving in an arc

jonmulcahy

I'm working on an update to Z is for Zombie, and I want my player to be able to toss a pipebomb to take out a large number of zombies. I'd like it to arc up 25 pixels from it's starting position, and land at it's same Y value about 100 pixels away. anyone ever try this before?

Hunnenkoenig

There is that demo project with the cannon and the cannonball.

Look at it. The cannonball flies an arc.

jonmulcahy

thanks for the tip, but I believe that flies in an arc because it's using gravity, which I don't. But I think I've figured it out, I'll post the solution I came up with if anyone is interested once I'm done.

Hunnenkoenig

Sure we are interested

sdpardue

yes, please do post your solution. thanks!

jonmulcahy

ok, it was actually pretty easy:

I've got an actor called pipeBomb, in it I created two custom attributes, 'arc' with a default value of 1 and 'startY'

for rules:

change attribute self.startY to self.positionY (this sets the pipebomb's initial start value, needed to determine when it hits ground.

Rotate clockwise at 150 (give it a spin)

Arc:
while self.Arc = 1
move up at 150
OTHERWISE move down at 150

ArcTimer
after .25
change attribute self.Arc = 0

MoveForward
move right at 300

finally, the rule to cause the explosion
if self.Position.Y is < self.startY-10 (I subtracted 10 to make it hit ground)
spawn actor Explosion
after .1 seconds - destroy actor

It works pretty good, it looks like the play is lobbing the bomb, and when it hits the ground, explodes.