///@description apply knockback based on direction from explosion point
///@param knockbackForce

var _knockbackForce = argument[0];
var _forceDir = point_direction(other.x, other.y, x,y);
var _forceX = lengthdir_x(_knockbackForce, _forceDir);
var _forceY = lengthdir_y(_knockbackForce, _forceDir);

other.currVelocity[XVELOCITY] += _forceX;
other.currVelocity[YVELOCITY] +=_forceY;