/****************************************************************************\
 Part of the XeTeX typesetting system
 Copyright (c) 1994-2008 by SIL International
 Copyright (c) 2009 by Jonathan Kew

 SIL Author(s): Jonathan Kew

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"Software"), to deal in the Software without restriction, including
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The above copyright notice and this permission notice shall be
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\****************************************************************************/

#include "trans.h"

void makeidentity(transform* t)
{
	t->a = 1.0;
	t->b = 0.0;
	t->c = 0.0;
	t->d = 1.0;
	t->x = 0.0;
	t->y = 0.0;
}

void makescale(transform* t, double xscale, double yscale)
{
	t->a = xscale;
	t->b = 0.0;
	t->c = 0.0;
	t->d = yscale;
	t->x = 0.0;
	t->y = 0.0;
}

void maketranslation(transform* t, double dx, double dy)
{
	t->a = 1.0;
	t->b = 0.0;
	t->c = 0.0;
	t->d = 1.0;
	t->x = dx;
	t->y = dy;
}
#include <stdio.h>
void makerotation(transform* t, double a)
{
	t->a = cos(a);
	t->b = sin(a);
	t->c = -sin(a);
	t->d = cos(a);
	t->x = 0.0;
	t->y = 0.0;
}

void transformpoint(realpoint* p, const transform* t)
{
	realpoint	r;
	r.x = t->a * p->x + t->c * p->y + t->x;
	r.y = t->b * p->x + t->d * p->y + t->y;
	*p = r;
}

void transformconcat(transform* t1, const transform* t2)
{
	transform	r;
	r.a = t1->a * t2->a + t1->b * t2->c + 0.0 * t2->x;
	r.b = t1->a * t2->b + t1->b * t2->d + 0.0 * t2->y;
	r.c = t1->c * t2->a + t1->d * t2->c + 0.0 * t2->x;
	r.d = t1->c * t2->b + t1->d * t2->d + 0.0 * t2->y;
	r.x = t1->x * t2->a + t1->y * t2->c + 1.0 * t2->x;
	r.y = t1->x * t2->b + t1->y * t2->d + 1.0 * t2->y;
	*t1 = r;
}
