# Another simple math question.

#### dudeim

##### New Member
Hey guys,

I again am having some problems with math.

Currently I'm calculating 3 points at a x radius around a spell casting unit, 3 projectiles should fly to those points, somehow though my calculations are wrong (as I'm no math genius I have no idea why it's not working or even if I'm doing it correct), this is what i do:

JASS:
``````
//calculating the starting angle .caster is the caster of the spell and .getY() basicly calls GetUnitY same for .getX
//.Y is the target Y of the spell cast (it can be both ground and unit) it&#039;s basicly GetSpellTargetY() same for .X
local real angle = bj_RADTODEG * Atan2(.caster.getY() - .Y, .caster.getX() - .X)

//this is how I calculate the target x,y positions the projectiles need to go to.
//700 is the circle radius I think it needs to go there atleast<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />
set x = .caster.getX() + 700 * Cos(angle)
set y = .caster.getY() + 700 * Sin(angle)``````

So these are my calculations and somehow the projectiles just fly to some random degree (though if I cast it at the same point the projectiles fly the same way).
So what am I doing wrong?

Thanks alot

It converts the angle vom radians to degrees ( Atan2 returns radians) but Cos and Sin take radians. bj_RADTODEG is just for GUI users.

Just remember 2*Pi := 360°

Oooh I just C&Ped that part from some script that basicly did what I wanted, but gonna remove it and see how it works
Edit: changed the calc in the top post to new one (so just removing the bj_RADTODEG) but now it's firing towards the otherside of the unit so it's like angle+180 degrees somehow

Ye, thats how the Atan2 (and Atan) function works.

Atan2(.caster.getY() - .Y, .caster.getX() - .X)
Here .Y is the Origin and .caster.getY() is the target. Switch the positions so it is

Atan2(.Y -.caster.getY(),.X - .caster.getX())
or just do
Atan2(.caster.getY() - .Y, .caster.getX() - .X) + bj_PI

Thanks it's working now

General chit-chat
Help Users
• No one is chatting at the moment.
• Ghan:
See how we like that.
• The Helper:
I do not see a way to go past the 1st page of posts on the forum though
• The Helper:
It is OK though for the main page to open up on the forum in the view it was before. As long as the portal has its own URL so it can be viewed that way I do want to try it as a regular forum view for a while
• Ghan:
Yeah I'm not sure what the deal is with the pagination.
• Ghan:
It SHOULD be there so I think it might just be an artifact of having an older style.
• Ghan:
I switched it to a "Standard" article forum. This will show the thread list like normal, but the threads themselves will have the first post set up above the rest of the "comments"
• The Helper:
I don't really get that article forum but I think it is because I have never really seen it used on a multi post thread
• Ghan:
RpNation makes more use of it right now as an example: https://www.rpnation.com/news/
• The Helper:
• The Helper:
What do you think Tom?
• tom_mai78101:
I will have to get used to this.
• tom_mai78101:
The latest news feed looks good
• The Helper:
I would like to see it again like Ghan had it the first time with pagination though - without the pagination that view will not work but with pagination it just might...
• The Helper:
This drink recipe I have had more than a few times back in the day! Mind Eraser https://www.thehelper.net/threads/cocktail-mind-eraser.194720/
• The Helper:
Happy Thursday!
• Ghan:
I'm not so sure, there's still a lot of Thursday left for it to become unhappy.
+3
• The Helper:
still a few hours
• The Helper:
Its Friday!!!!
+1
• Ghan:
Thursday 7/10 would Thursday again
+3
• The Helper:
New forum coming soon going to be for my friend Saylor who is blind and he is doing motivational speaking and has an internet radio show and podcast. I am going to put a forum to promote him and other inspirational speaker stuff going to have some good stuff in it.
• The Helper:
his audio only music mix
• The Helper:
it just makes sense right?

### Members online

No members online now.