Ruby point a event in a direction (8way)

[MysticTrunks]

I'm working on both a C++/SDL and RPG Maker Xp abs system and while most of my code transfered over nicely my code for pointing a direction did not.

Basically for a abs when you hit your enemy it will point the direction where the Hero's X/Y is located. So for an example I'll basically just show you how it'd be done in Game Maker(won't give out my C++ code yet)

while(enemy_hit=true) {
speed=2;
direction=point_direction(herox,heroy,x,y)
}

should be simple enough.

Edit: did some playing around in C# this is what I'm thinking but don't know RPG Makers api well enough to be certain.

x = x + cos(hero_x) * direction
y = y + sin(hero_y) * direction
dt = ((x2 - x)^2 + (y2 - y)^2) ^ 0.5
new position
x = x + (x2 - x) * (direction / dt)
y = y + (y2 - y) * (direction / dt)

 

[MysticTrunks]

I just finished a script in GM that translated the point_direction function of course ruby doesn't have this so it'd have to be scripted.

If anyone want's to help with this that'd be awesome, and I wish RM had a direction function that didn't just go up to 8 but had all 360 degrees..

x1 = argument0;

y1 = argument1;

x2 = argument2;

y2 = argument3;

 

dt = sqrt(sqr(x2 - x1) + sqr(y2 - y1));

dir = 0;

 

if (x2 > x1){

   if (y2 > y1){

       dir = ceil(arcsin((y2 - y1)/dt));

   }else{ 

       dir = ceil(360 - arcsin((x2 - x1)/dt));

   }

}else{

   if (y2 > y1){

       dir = ceil(180 - arcsin((y2 - y1)/dt));

   }else{

       dir = ceil(180 + arcsin((x2 - x1)/dt));

   }

}

return (((arctan2(argument0-argument2,argument1-argument3)* (180/pi))) + 450) mod 360;

x1 and y1 = hero's x/y, x2 and y2 = enemy ai's x/y