Crescent Arrow Spell

[indomitable1319]

Hey guys. Indomitable1319 here.

I've got a small spell request. I've seen it before in some AoS map: a Ranger hero targets a point and an arrow fires from her right side and travels to the target point and back to the hero; in a crescent movement.

What I'm asking for is a duplicate of that spell, only this one not only deals damage to the targets hit by the arrow but it also slows the affected units.

Could someone please make this spell for me, and make the arrow speed customizable in the trigger?

Thank you!
Here's an illustration of what the spell looks like.

 

[Stylo]

spell

Like this one ?

 

[indomitable1319]

Kind of.
You understand the crescent part, although from what the image shows it looks like the phoenix follows the caster to find its end point.
What I am looking for is the unit targets a point, then the arrow fires from the right side and swoops to the left then returns to the caster; just like the illustration I have above. Each unit that is hit will receive damage and will be slowed for a short time.

 

[indomitable1319]

Bump!
Please, I'm getting desperate on this one.

 

[AlienAtSystem]

Well, I don't know how good you are with triggering, but here is a snippet to produce a curving path to a target and then back to the caster:

real t=0
real Xc = GetUnitX(caster)
real Yc = GetUnitY(caster)
real Xt = GetSpellTargetX()
real Yt = GetSpellTargetY()
unit arrow = CreateUnit(...)
//Periodic Timer:
set Xc=GetUnitX(caster)
set Yc=GetUnitY(caster)
call SetUnitX(arrow, (Xt-Xc)*Sin(t*PI)+0.25*(Yt-Yc)*Sin(2*t*PI)+Xc)
call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)+0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)
call GroupEnumUnitInArea(foo, GetUnitX(Arrow),GetUnitY(arrow),AoE,Condition( function bar))
set t=t+interval

function bar takes nothing returns boolean
 local unit u = GetFilterUnit()
 if IsUnitEnemy(u,GetOwningPlayer(caster)) and not IsUnitType(u,UNIT_TYPE_DEAD) then
  call UnitDamageTarget(caster,u,....)
 endif
 return false
endfunction

The arrow comes back to the caster at t=1

 

[indomitable1319]

I don't understand that.

 

[Doomlord]

I can use AlienAtSystem's snippet to code this (MUI, everything customizable blah blah blah) but I will do it in traditional JASS. Will this suffice?

 

[muzzel]

As far as i can see this only works if the spell gets casted to the east (blue curve), in other directions the arc looks weird.

dt = [0:0.01:1];
hold all;

c = [0; 0];
t = [100; 0];
traj(1, :) = c(1) + (t(1) - c(1)) * sin(dt * pi) + 0.25 * (t(2) - c(2)) * sin(2 * dt * pi);
traj(2, :) = c(2) + (t(2) - c(2)) * sin(dt * pi) + 0.25 * (t(1) - c(1)) * sin(2 * dt * pi);
plot(traj(1, :), traj(2, :))

c = [0; 0];
t = [100; 100];
traj(1, :) = c(1) + (t(1) - c(1)) * sin(dt * pi) + 0.25 * (t(2) - c(2)) * sin(2 * dt * pi);
traj(2, :) = c(2) + (t(2) - c(2)) * sin(dt * pi) + 0.25 * (t(1) - c(1)) * sin(2 * dt * pi);
plot(traj(1, :), traj(2, :))

c = [0; 0];
t = [200; 100];
traj(1, :) = c(1) + (t(1) - c(1)) * sin(dt * pi) + 0.25 * (t(2) - c(2)) * sin(2 * dt * pi);
traj(2, :) = c(2) + (t(2) - c(2)) * sin(dt * pi) + 0.25 * (t(1) - c(1)) * sin(2 * dt * pi);
plot(traj(1, :), traj(2, :))

c = [0; 0];
t = [100; 200];
traj(1, :) = c(1) + (t(1) - c(1)) * sin(dt * pi) + 0.25 * (t(2) - c(2)) * sin(2 * dt * pi);
traj(2, :) = c(2) + (t(2) - c(2)) * sin(dt * pi) + 0.25 * (t(1) - c(1)) * sin(2 * dt * pi);
plot(traj(1, :), traj(2, :))

legend('t = [100; 0]', 't = [100; 100]', 't = [200; 100]', 't = [100; 200]')
xlabel('x');
ylabel('y');

 

[Doomlord]

Spell created. The arc is indeed erratic as muzzle pointed out. Mag is helping me find a better formula. So be patient and consider this a beta demo

Further details is included in my VM for you. Don't hesitate to contact me through PM or VM if you need any further assistance

 

[indomitable1319]

Thank you!

I understand what you mean with the arc thingy. It sometimes ends up looking like a straight line instead of a circle.

Yes, you may, although I suggest waiting for Mag's advice on the formula.

Via VM.

 

[AlienAtSystem]

Yeah, sorry guys, a sign error. The second line has to be call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)-0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)

 

[Doomlord]

Yeah, sorry guys, a sign error. The second line has to be call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)-0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)

Okay. Thanks for clearing that out. Will update the spell ASAP.

 

[muzzel]

Yeah, sorry guys, a sign error. The second line has to be call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)-0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)

nah im sry u had it right in the first place

call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)+0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)
is correct

i made a typ and used
call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)+0.25*(Xt-Xc)*Sin(2*t*PI)+Yc)
which is equal to
call SetUnitY(arrow, (Yt-Yc)*Sin(t*PI)-0.25*(Xc-Xt)*Sin(2*t*PI)+Yc)

 

[Doomlord]

Spell updated. So now I finished your spell exactly as requested. It uses an arrow model and it has facing capability but the only downside is if the distance is too short it will look a bit ugly D: Well it all depends on your opinion

 

[indomitable1319]

I'll check it out a bit later, since I have quite a lot of things on my hand right now, but thank you for your perseverant work.