How to pull units to a line?

[Tyrande_ma3x]

I have a spell that creates a long line and then picks units around it. How can I pull the units towards the center of the line? I already have the units picked around it (as well as the units' position, the starting point of the line and the ending one) but I have no idea how to do the maths and such...
Here's an image of what I'm trying to do:

Say, the red line is my line and the blue dots are the units.

And then I want to pull them to its center like this:

Suggestions?

 

[13lade619]

..only way i can think of is this:

a moving area where you pick a group of units..then pull all the units towards the center?

 

[Tyrande_ma3x]

> a moving area where you pick a group of units
I was thinking about that as well but it consumes too much performance...

I found the way though, if someone is interested, here it is:

private function GetLineCenter takes real Ax, real Ay, real Bx, real By, real Cx, real Cy returns location
    local real r
    local real dx = Bx - Ax
    local real dy = By - Ay
    local real L = ((dx) * (dx) + (dy) * (dy)) 
    set r = ((Cx - Ax) * (dx) + (Cy - Ay) * (dy)) / (L) 
    set Ax = Ax + r * (dx)
    set Ay = Ay + r * (dy)
    return Location(Ax, Ay)
endfunction

 

[_whelp]

Wow, I'm surprised that it's that big! Maybe it's because I don't know much math.
What do you put on the arguments?

 

[MaxTM]

Thanks for sharing.

EDIT ~ I understand it, but what formula did you used to calculate it?

 

[Tyrande_ma3x]

> What do you put on the arguments?

takes real Ax, real Ay, real Bx, real By, real Cx, real Cy

Ax - starting X coordinate of the line
Ay - starting Y coordinate of the line
Bx - ending X coordinate of the line
By - ending Y coordnate of the line
Cx - X coordinate of a unit (mostly this unit will be previously detected around the line)
Cy - Y coordinate of a unit

 

[elmstfreddie]

Thanks for sharing.

EDIT ~ I understand it, but what formula did you used to calculate it?

didn't read it, but wouldn't it just be more logical to find the difference in their xs then add it to the unit's x to make it on the line?
Only if the line is always vertical though, I suppose.

 

[kingkingyyk3]

Set all unit to same X..

 

[Tyrande_ma3x]

Set all unit to same X..

?

 

[kingkingyyk3]

Same X coordinate with the line.

 

[wraithseeker]

... Still don't understand what you are saying.

 

[Tyrande_ma3x]

... Still don't understand what you are saying.

Same.

 

[Nexor]

I thnik you have to calculate the distance and angle from the point to the line, and then move it by the calculated distance toward the angle.

 

[Tyrande_ma3x]

Uh, guys, I already told you I found how to do it and even posted the sollution...

 

[Nexor]

then make a snippet from it and ask a moderator to close this thread

 

[Tyrande_ma3x]

then make a snippet from it and ask a moderator to close this thread

I won't since it's a rough ripoff from LineSegments. xD

 

[Nexor]

you asked for help, you made a solution. that's something you can be proud of (imho) I'd clean the code and make a snippet from it, if it would be my work.