'Power' parameter in the shoot command
 

I am attempting to create a projectile using the 'zangle' and 'power' parameters of the 'shoot' command, something like the bows on Graal Kingdoms. My problem is that I cannot find out the equation for 'power' based on the distance you want the projectile to be launched. I'm using a zangle of pi/4.

Any help would be much appreciated. (Please do not simply say "search the forums", as I have done so, but every conversation I've seen about the zangle in the shoot command has ended abruptly before 'power' was touched.)


Thanks,
Okiesmokie

Use a loop to test increasing powers simulating shoot, until you have found one that works for the distance.

sike, that's a terrible way

just calculate the projectile physics, like i did

v = dt
d=1/2at^2 + vit

simultaneous equations, or whatever it's called, the time is the same in both equations (well, the time is double in the v=dt equation)

the information about projectile movement can be found in newfeatures.txt

i used a constant zangle of 45 degrees

i could just post you the entire script but that might be against the rules?

What does the 'i' variable represent?


I saw that information, But I don't have a strong enough hold on physics and whatnot to be able to get the equation for power out of it. :(


That's what pi/4 is, I think.


Only the shoot command, or the place where you calculate power is really required.

vi, it stands for initial velocity, i was thinking i should have clarified this but i didn't for some reason...

you really sort of need to have taken physics to understand how to solve this

i didn't simplify any of the stuff that could be simplified

NPC Code:

---

this.power = ( ( this.dist * -0.1 ) / ( 2 * cos(this.zangle)  * -1 * sin(this.zangle) ) ) ^ 0.5;

---

you will probably want to offset your destination x y by -1.5 or something, since projectiles have a width/height of 48x48

otherwise the top left corner will land at the coordinates you used (i think)


here is the information I used, by the way, taken from newfeatures
(actually someone pasted it into the #gscript channel)
I found this file where I saved my work
Stefan uses speed to say power in the newfeatures explanation

Thank you very much, your solution worked perfectly :)

The thing that threw me off was the 'speed' in newfeatures, I didn't know that meant power x_x

I highly doubt you did 45 degrees considering these is based off of radians...
pi/4 is the radian equivalent of 45 degrees.

The rest is just basic physics calculations. I haven't played with the shoot command much, but if it follows basic physics principles then all the equations stated should work out.