/*
Copyright (C) 2015 Parallel Realities

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.

*/

#include "util.h"

float mod(float n, float x)
{
	return fmod(fmod(n, x) + x, x);
}

int rrnd(int low, int high)
{
	return low + rand() % ((high - low) + 1);
}

int getPercent(float current, float total)
{
	return (current / total) * 100;
}

int collision(int x1, int y1, int w1, int h1, int x2, int y2, int w2, int h2)
{
	return (MAX(x1, x2) < MIN(x1 + w1, x2 + w2)) && (MAX(y1, y2) < MIN(y1 + h1, y2 + h2));
}

float getAngle(int x1, int y1, int x2, int y2)
{
	float angle = -90 + atan2(y1 - y2, x1 - x2) * (180 / PI);
	return angle >= 0 ? angle : 360 + angle;
}

int getDistance(int x1, int y1, int x2, int y2)
{
	int x, y;
	
	x = x2 - x1;
	y = y2 - y1;
	
	return sqrt(x * x + y *y);
}

void getSlope(int x1, int y1, int x2, int y2, float *dx, float *dy)
{
	int steps = MAX(abs(x1 - x2), abs(y1 - y2));

	if (steps == 0)
	{
		*dx = *dy = 0;
		return;
	}

	*dx = (x1 - x2);
	*dx /= steps;

	*dy = (y1 - y2);
	*dy /= steps;
}