Moving a unit in a circle

[dudeim]

Hey,

I'm trying to move a projectile (unit) in a circle but as i'm really bad with math and have no idea how I would even do this
I've seen some spells that use this but I couldn´t really figure out how it works and I want to learn how to use it myself not just C&P.

Can anyone help me on this?

Thanks

 

[Sevion]

You could use Sin/Cos:

scope spin initializer init
    globals
        private unit theUnit = null
        private constant real RADIUS = 250
        private constant real SPEED = 10 * bj_DEGTORAD
        private real ang = 0
    endglobals

    // This is the function that does the actual spinning
    private function doSpin takes nothing returns nothing
        // This is the part you want
        call SetUnitX(theUnit, GetUnitX(theUnit) + RADIUS * Cos(ang))
        call SetUnitY(theUnit, GetUnitY(theUnit) + RADIUS * Sin(ang))
        set ang = ang + SPEED
    endfunction

    private function init takes nothing returns nothing
        set theUnit = CreateUnit('ewsp', Player(0), RADIUS, 0, 0)
        call TimerStart(CreateTimer(), 0.0325, true, function doSpin)
    endfunction
endscope

 

[Nestharus]

Sev just showed the crappy way. The best way is by using the parametric equation for a whirpool type vector field. If you want constant speeds regardless of circle size, you'd want to use unit vectors by dividing by the absolute value (excluding 0 ofc).

You can also shift it around the map and change the radius and speed =P.

scope spin initializer init
    globals
        private unit theUnit = null
    endglobals
    private function doSpin takes nothing returns nothing
        local real x=GetWidgetX(theUnit)
        local real y=GetWidgetY(theUnit)
        call SetUnitX(theUnit, x-y)
        call SetUnitY(theUnit, y+x)
    endfunction

    private function init takes nothing returns nothing
        set theUnit = CreateUnit('ewsp', Player(0), 0, 0, 0)
        call TimerStart(CreateTimer(), 0.03250000, true, function doSpin)
    endfunction
endscope

 

[Dirac]

A lot of people are asking for this kind of things now, i just made this snippet, is very beta but i'm working on it's release as fast as i can

http://www.thehelper.net/forums/showthread.php/165808-Snippet-Beta-Circles

It does what Nestharus said, but in a very user friendly way

 

[dudeim]

Pff too tired to figure it all out right know I'll see it in the morning thanks for responding

 

[NoobImbaPro]

How to think: Take the unit you want and a circle, remember circle's characteristics, and think of it moving on that circle like a short movie.
Take now the circles characteristics, what does it change, what does remain same ?
If answered the above questions you know know how to solve it.