VectorAngle

From ZDoom Wiki

int VectorAngle (int x, int y)

Usage

Returns the fixed point angle of the vector (x,y). Angles are measured from the east and moving counterclockwise.

Parameters

• x, y

Coordinates of the end point of the vector.

Return value

Fixed point angle of the vector (x,y).

Examples

This script will print a little ^ at the botton of the player's screen pointing at the actor with TID set to 1:

script 1 ENTER
{
    int vang, angle;
    while(1)
    {    
        vang = VectorAngle (GetActorX (1) - GetActorX (0), GetActorY (1) - GetActorY (0));
        angle = (vang - GetActorAngle (0) + 1.0) % 1.0;

        if (angle < 0.2 || angle > 0.8)
        {
            int sx = 320 - (320 * Sin (angle) / Cos (angle));

            SetHudSize (640, 480, 0);
            HudMessage (s:"^"; HUDMSG_PLAIN, 1, CR_RED, sx * 1.0, 480.2, 0);
        }
        else
        {
            HudMessage (s:" "; HUDMSG_PLAIN, 1, CR_RED, 0, 0, 0);
    
        }

        Delay (1);
    }
}