#define __SP_SVG_AFFINE_C__

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <cstring>

#include <string>

#include <cstdlib>

#include <cstdio>

#include <glib/gstrfuncs.h>

#include <libnr/nr-matrix-fns.h>

#include <libnr/nr-matrix-ops.h>

#include <2geom/transforms.h>

#include <2geom/angle.h>

#include <libnr/nr-convert2geom.h>

#include "svg.h"

#include "prefs-utils.h"

#ifndef M_PI

# define M_PI 3.14159265358979323846

#endif

sp_svg_transform_read(gchar const *str, Geom::Matrix *transform)

{

NR::Matrix mat;

if (sp_svg_transform_read(str, &mat)) {

*transform = mat;

return true;

} else {

return false;

}

}

sp_svg_transform_read(gchar const *str, NR::Matrix *transform)

{

int idx;

char keyword[32];

double args[6];

int n_args;

size_t key_len;

if (str == NULL) return false;

NR::Matrix a(NR::identity());

idx = 0;

while (str[idx]) {

/* skip initial whitespace */

while (g_ascii_isspace (str[idx])) idx++;

/* parse keyword */

for (key_len = 0; key_len < sizeof (keyword); key_len++) {

char c;

c = str[idx];

if (g_ascii_isalpha (c) || c == '-') {

keyword[key_len] = str[idx++];

} else {

break;

}

}

if (key_len >= sizeof (keyword)) return false;

keyword[key_len] = '\0';

/* skip whitespace */

while (g_ascii_isspace (str[idx])) idx++;

if (str[idx] != '(') return false;

idx++;

for (n_args = 0; ; n_args++) {

char c;

char *end_ptr;

/* skip whitespace */

while (g_ascii_isspace (str[idx])) idx++;

c = str[idx];

if (g_ascii_isdigit (c) || c == '+' || c == '-' || c == '.') {

if (n_args == sizeof (args) / sizeof (args[0])) return false; /* Too many args */

args[n_args] = g_ascii_strtod (str + idx, &end_ptr);

//printf("took %d chars from '%s' to make %f\n",

// end_ptr-(str+idx),

// str+idx,

// args[n_args]);

idx = end_ptr - (char *) str;

while (g_ascii_isspace (str[idx])) idx++;

/* skip optional comma */

if (str[idx] == ',') idx++;

} else if (c == ')') {

break;

} else {

return false;

}

}

idx++;

/* ok, have parsed keyword and args, now modify the transform */

if (!strcmp (keyword, "matrix")) {

if (n_args != 6) return false;

a = (*NR_MATRIX_D_FROM_DOUBLE(args)) * a;

} else if (!strcmp (keyword, "translate")) {

if (n_args == 1) {

args[1] = 0;

} else if (n_args != 2) {

return false;

}

a = Geom::Translate(args[0], args[1]) * a;

} else if (!strcmp (keyword, "scale")) {

if (n_args == 1) {

args[1] = args[0];

} else if (n_args != 2) {

return false;

}

a = Geom::Scale(args[0], args[1]) * a;

} else if (!strcmp (keyword, "rotate")) {

if (n_args != 1 && n_args != 3) {

return false;

}

Geom::Rotate const rot(Geom::deg_to_rad(args[0]));

if (n_args == 3) {

a = ( Geom::Translate(-args[1], -args[2])

* rot

* Geom::Translate(args[1], args[2])

* Geom::Matrix(a) );

} else {

a = rot * a;

}

} else if (!strcmp (keyword, "skewX")) {

if (n_args != 1) return false;

a = ( NR::Matrix(1, 0,

tan(args[0] * M_PI / 180.0), 1,

0, 0)

* a );

} else if (!strcmp (keyword, "skewY")) {

if (n_args != 1) return false;

a = ( NR::Matrix(1, tan(args[0] * M_PI / 180.0),

0, 1,

0, 0)

* a );

} else {

return false; /* unknown keyword */

}

/* Skip trailing whitespace */

while (g_ascii_isspace (str[idx])) idx++;

}

*transform = a;

return true;

}

#define EQ(a,b) (fabs ((a) - (b)) < 1e-9)

gchar *

sp_svg_transform_write(Geom::Matrix const &transform)

{

return sp_svg_transform_write(&transform);

}

gchar *

sp_svg_transform_write(Geom::Matrix const *transform)

{

NR::Matrix const t(*transform);

return sp_svg_transform_write(&t);

}

gchar *

sp_svg_transform_write(NR::Matrix const &transform)

{

NR::Matrix const t(transform);

return sp_svg_transform_write(&t);

}

gchar *

sp_svg_transform_write(NR::Matrix const *transform)

{

double e;

if (!transform) {

return NULL;

}

e = 0.000001 * NR::expansion(*transform);

int prec = prefs_get_int_attribute("options.svgoutput", "numericprecision", 8);

int min_exp = prefs_get_int_attribute("options.svgoutput", "minimumexponent", -8);

/* fixme: We could use t1 * t1 + t2 * t2 here instead */

if (NR_DF_TEST_CLOSE ((*transform)[1], 0.0, e) && NR_DF_TEST_CLOSE ((*transform)[2], 0.0, e)) {

if (NR_DF_TEST_CLOSE ((*transform)[4], 0.0, e) && NR_DF_TEST_CLOSE ((*transform)[5], 0.0, e)) {

if (NR_DF_TEST_CLOSE ((*transform)[0], 1.0, e) && NR_DF_TEST_CLOSE ((*transform)[3], 1.0, e)) {

/* We are more or less identity */

return NULL;

} else {

/* We are more or less scale */

gchar c[256];

unsigned p = 0;

strcpy (c + p, "scale(");

p += 6;

p += sp_svg_number_write_de (c + p, (*transform)[0], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[3], prec, min_exp);

c[p++] = ')';

c[p] = '\000';

g_assert( p <= sizeof(c) );

return g_strdup(c);

}

} else {

if (NR_DF_TEST_CLOSE ((*transform)[0], 1.0, e) && NR_DF_TEST_CLOSE ((*transform)[3], 1.0, e)) {

/* We are more or less translate */

gchar c[256];

unsigned p = 0;

strcpy (c + p, "translate(");

p += 10;

p += sp_svg_number_write_de (c + p, (*transform)[4], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[5], prec, min_exp);

c[p++] = ')';

c[p] = '\000';

g_assert( p <= sizeof(c) );

return g_strdup(c);

} else {

gchar c[256];

unsigned p = 0;

strcpy (c + p, "matrix(");

p += 7;

p += sp_svg_number_write_de (c + p, (*transform)[0], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[1], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[2], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[3], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[4], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[5], prec, min_exp);

c[p++] = ')';

c[p] = '\000';

g_assert( p <= sizeof(c) );

return g_strdup(c);

}

}

} else {

gchar c[256];

unsigned p = 0;

strcpy (c + p, "matrix(");

p += 7;

p += sp_svg_number_write_de (c + p, (*transform)[0], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[1], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[2], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[3], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[4], prec, min_exp);

c[p++] = ',';

p += sp_svg_number_write_de (c + p, (*transform)[5], prec, min_exp);

c[p++] = ')';

c[p] = '\000';

g_assert( p <= sizeof(c) );

return g_strdup(c);

}

}