[JASS] Need math code for Mirroring Angles!

[Dynasti]

Ok for my new so called "spell" i need some kind of math code to mirror an angle to make it look like it bounces of the things it hits.

Ok an example picture is needed i think

Hope you all understand and please comment if you do. Thx

 

[Dynasti]

So, any ideas? ^^

 

[TheBlooddancer]

I posted my answer in chat.

 

[donut3.5]

180 - angle = mirrored angle.
--donut3.5--

 

[Smiddle]

180 - angle = mirrored angle.
--donut3.5--

Assuming that the horizontal line is 0 degrees, Mr Doughnut is correct.

 

[donut3.5]

True, I should add (180 + horizontal angle) - angle = mirrored angle.
This is important if you want to also have vertical walls, or even slanted ones.
--donut3.5--

 

[TheBlooddancer]

Exactly what i said
(How to get the Horizontal angle btw?)

 

[Deaod]

// pure pseudocode
local real ang = Atan2(GetUnitY(obj)-GetUnitY(inc), GetUnitX(obj)-GetUnitX(inc)) // obj is a static object, unable to move; inc is the incoming unit
local real sang = Atan2(inc.speed.y, inc.speed.x)
local real newang = bj_PI + (2*ang) - sang
    set inc.speed.x=Cos(newang)*inc.speed.amount
    set inc.speed.y=Sin(newang)*inc.speed.amount

two units colliding.

 

[Dynasti]

Bump!

Ok I dont know how to get the Horizontal angle >.<. I just need to collide with walls from any angle

 

[Dynasti]

Bump!

Ah, come on! i really need to find out that horizontal angle :x

 

[Element of Water]

are your walls all vertical? and you want a unit to bounce off them? angle=270-unit's angle

 

[The Reborn Devil]

if you have a x velocity and a y velocity you can do it like this:

...
if IsPathable(x + xvel, y) then
    set xvel = xvel * -1
endif
if IsPathable(x, y + yvel) then
    set yvel = yvel * -1
endif
...

I hope you understand what I mean.