How do I make a wild axes type spell?

[black.sheep]

Hello, I would like to know how spells like wild axes work.(Mainly just the maths for controling the projectiles) and create a single projectile one.

 

[WildTurkey]

hahaha you dont know how often that question is asked on this forum

tip 1: use the search tool

i to asked the same question a long time ago.. haha

http://www.thehelper.net/forums/showthread.php?t=71809&highlight=wild+axe

check that

 

[Firezy]

http://www.thehelper.net/forums/showthread.php?t=81733&highlight=wild+axes

http://www.thehelper.net/forums/showthread.php?t=106392&highlight=wild+axes


Theres more though I'm not gonna link it all, use search button

 

[black.sheep]

Ah yes, the search button.
Well, thanks for reminding meh.
Edit: Im using this formual, but i dont know what to do.

// C is a point between A and B
Cx = (Ax+Bx)/2a
Cy = (Ay+By)/2

// gamma is the angle from A to B
gamma = Atan2(By-Ay, Bx-Ax)

// we use sin for x and cos for y to get a normal through point C
// <b>curve</b> is a factor of curvature
// zero means a perfect semicircle between A and B
// any bigger number means bigger circle == smaller curve
// negative curve == left side, positive curve == right side
// D is some circle center on our normal 
Dx = Cx + curve*Sin(gamma)
Dy = Cy + curve*Cos(gamma)

// now that we have D we need angles from D to A, and from D to B
// we will mark them as alpha and beta
alpha = Atan2(Ay-Dy, Ax-Dx)
beta = Atan2(By-Dy, Bx-Dx)

// So out projectiles will move on circle sector,
// center is D, starting angle is alpha, ending angle is beta
// and radius is |DA| == |DB| == SquareRoot((Dx-Ax)^2+(Dy-Ay)^2)
//  alpha &lt; angle &lt; beta
Mx = Dx + radius * Cos(angle)
My = Dy + radius * Sin(angle)

// So all you need to do is calculate in this order:
// C, gamma, D, alpha, beta, radius
// and then get M points by rotating angle from alpha to beta

// This way you get one curve, to get 4 curves use different curve parameters
// I recommend this curvatures:
// +0.01   == positive zero
// -0.01   == negative zero
// +|AB|*0.87  == left side equilateral triangle ABD
// -|AB|*0.87  == right side equilateral triangle ABD

Note: since all curves have different lengths angle speed (rotating from alpha to beta) should be the same for all of them to make sure all projectiles get to destination at the same time.

Happy coding :thup:

So what do I do with it, ive set all the varibles, i just dont know how to move the object.

 

[black.sheep]

Bump

 

[black.sheep]

Bummpidy bump