p2mathlib.qc

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/*
 Copyright (C) 2015 Micah Talkiewicz.

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

ERASEABLE
vector vec_bias(vector v, float f)
{
    vector c;
    c.x = v.x + f;
    c.y = v.y + f;
    c.z = v.z + f;
    return c;
}
ERASEABLE
vector vec_to_min(vector a, vector b)
{
    vector c;
    c.x = min(a.x, b.x);
    c.y = min(a.y, b.y);
    c.z = min(a.z, b.z);
    return c;
}

ERASEABLE
vector vec_to_max(vector a, vector b)
{
    vector c;
    c.x = max(a.x, b.x);
    c.y = max(a.y, b.y);
    c.z = max(a.z, b.z);
    return c;
}

// there may already be a function for bounding a vector in this manner, however my very quick search did not reveal one -- Player_2
ERASEABLE
vector vec_bounds_in(vector point, vector a, vector b)
{
    vector d = vec_to_min(a, b);
    vector e = vec_to_max(a, b);

    vector c = vec_to_min(vec_to_max(point, d), e);

    return c;
}

ERASEABLE
vector vec_bounds_out(vector point, vector a, vector b)
{
    vector d = vec_to_max(a, b);
    vector e = vec_to_min(a, b);

    vector c = vec_to_min(vec_to_max(point, d), e);

    return c;
}

ERASEABLE
float angle_snap_f(float f, float increment)
{
    for (int j = 0; j <= 360; )
    {
        if (f <= j - increment) return j - increment;
        j = j + increment;
    }

    return 0;
}

ERASEABLE
vector angle_snap_vec(vector v, float increment)
{
    vector c;
    c.x = angle_snap_f(v.x, increment);
    c.y = angle_snap_f(v.y, increment);
    c.z = angle_snap_f(v.z, increment);
    return c;
}

ERASEABLE
vector aim_vec(vector org, vector targ)
{
    vector v;
    // we float around x and y, but rotate around z
    v.x = targ.x - org.x;
    v.y = targ.y - org.y;
    v.z = org.z - targ.z;
    // get the angles actual
    return vectoangles(normalize(v));
}