/*
 * Copyright (c) 2008-2009 Bill Whitacre http://rampancy.g0dsoft.com
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
*/

#include "transform.h"

void rotate_points2(rat_real theta,rat_real *in,rat_real *out,unsigned int count)
{
	register unsigned int i,i2,i2p1;
	register rat_real cosine,sine;

	if (theta==0)
	{
		memcpy(out,in,count*sizeof(rat_real)*2);
		return;
	}

	cosine=cos(theta);
	sine=sin(theta);

	for (i=0; i<count; i++)
	{
		i2p1=(i2=i*2)+1;
		out[i2]=in[i2]*cosine-in[i2p1]*sine;
		out[i2p1]=in[i2p1]*cosine+in[i2]*sine;
	}
}

void rotate_points_with_precalc_sine2(rat_real cosine,rat_real sine,rat_real *in,rat_real *out,unsigned int count)
{
	register unsigned int i,i2,i2p1;
	register rat_real cosin=cosine;
	register rat_real _sin=sine;

	for (i=0; i<count; i++)
	{
		i2p1=(i2=i*2)+1;
		out[i2]=in[i2]*cosin-in[i2p1]*_sin;
		out[i2p1]=in[i2p1]*cosin+in[i2]*_sin;
	}
}

void translate_points2(rat_real trans[2],rat_real *in,rat_real *out,unsigned int count)
{
	register unsigned int i,i2,i2p1;

	for (i=0; i<count; i++)
	{
		i2p1=(i2=i*2)+1;
		out[i2]=in[i2]+trans[0];
		out[i2p1]=in[i2p1]+trans[1];
	}
}

void scale_points2(rat_real coef[2],rat_real *in,rat_real *out,unsigned int count)
{
	register unsigned int i,i2,i2p1;

	for (i=0; i<count; i++)
	{
		i2p1=(i2=i*2)+1;
		out[i2]=in[i2]*coef[0];
		out[i2p1]=in[i2p1]*coef[1];
	}
}