124 lines
2.0 KiB
C
124 lines
2.0 KiB
C
/*
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Copyright (C) 2018-2019 Parallel Realities
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "maths.h"
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float mod(float n, float x)
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{
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return fmod(fmod(n, x) + x, x);
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}
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float getAngle(int x1, int y1, int x2, int y2)
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{
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float angle = -90 + atan2(y1 - y2, x1 - x2) * (180 / PI);
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return angle >= 0 ? angle : 360 + angle;
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}
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int rrnd(int low, int high)
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{
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return low + rand() % ((high - low) + 1);
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}
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double randF(void)
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{
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return (double)rand() / (double)((unsigned)RAND_MAX + 1);
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}
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int getPercent(float current, float total)
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{
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return total > 0 ? (current / total) * 100 : 0;
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}
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float limit(float i, float a, float b)
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{
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if (i < a)
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{
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return a;
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}
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if (i > b)
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{
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return b;
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}
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return i;
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}
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int getDistance(int x1, int y1, int x2, int y2)
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{
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int x, y;
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x = x2 - x1;
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y = y2 - y1;
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return sqrt(x * x + y *y);
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}
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void getSlope(int x1, int y1, int x2, int y2, float *dx, float *dy)
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{
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int steps = MAX(abs(x1 - x2), abs(y1 - y2));
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if (steps == 0)
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{
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*dx = *dy = 0;
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return;
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}
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*dx = (x1 - x2);
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*dx /= steps;
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*dy = (y1 - y2);
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*dy /= steps;
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}
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float wrap(float value, float low, float high)
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{
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if (value < low)
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{
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return high;
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}
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if (value > high)
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{
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return low;
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}
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return value;
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}
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unsigned long hashcode(const char *str)
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{
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unsigned long hash = 5381;
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int c;
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c = *str;
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while (c)
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{
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hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
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c = *str++;
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}
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hash = ((hash << 5) + hash);
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return hash;
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}
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