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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* IfsCompose is a interface for creating IFS fractals by
* direct manipulation.
* Copyright (C) 1997 Owen Taylor
*
* 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.
*/
typedef struct {
gdouble a11,a12,a21,a22,b1,b2;
} Aff2;
typedef struct {
gdouble vals[3][4];
} Aff3;
typedef struct {
GdkPoint *points;
gint npoints;
} IPolygon;
typedef struct {
gdouble x, y;
gdouble theta;
gdouble scale;
gdouble asym;
gdouble shear;
gint flip;
GimpRGB red_color;
GimpRGB green_color;
GimpRGB blue_color;
GimpRGB black_color;
GimpRGB target_color;
gdouble hue_scale;
gdouble value_scale;
gint simple_color;
gdouble prob;
} AffElementVals;
typedef struct
{
gint num_elements;
gint iterations;
gint max_memory;
gint subdivide;
gdouble radius;
gdouble aspect_ratio;
gdouble center_x;
gdouble center_y;
} IfsComposeVals;
typedef struct {
AffElementVals v;
Aff2 trans;
Aff3 color_trans;
gchar *name;
IPolygon *click_boundary;
IPolygon *draw_boundary;
} AffElement;
/* manipulation of affine transforms */
void aff2_translate (Aff2 *naff, gdouble x, gdouble y);
void aff2_rotate (Aff2 *naff, gdouble theta);
void aff2_scale (Aff2 *naff, gdouble s, gint flip);
void aff2_distort (Aff2 *naff, gdouble asym, gdouble shear);
void aff2_compute_stretch (Aff2 *naff,
gdouble xo, gdouble yo,
gdouble xn, gdouble yn);
void aff2_compute_distort (Aff2 *naff,
gdouble xo, gdouble yo,
gdouble xn, gdouble yn);
void aff2_compose (Aff2 *naff, Aff2 *aff1, Aff2 *aff2);
void aff2_invert (Aff2 *naff, Aff2 *aff);
void aff2_apply (Aff2 *aff, gdouble x, gdouble y,
gdouble *xf, gdouble *yf);
void aff2_fixed_point (Aff2 *aff, gdouble *xf, gdouble *yf);
void aff3_apply (Aff3 *t, gdouble x, gdouble y, gdouble z,
gdouble *xf, gdouble *yf, gdouble *zf);
/* manipulation of polygons */
IPolygon *ipolygon_convex_hull (IPolygon *poly);
gint ipolygon_contains (IPolygon *poly, gint xt, gint yt);
/* manipulation of composite transforms */
AffElement *aff_element_new (gdouble x, gdouble y, GimpRGB *color, gint count);
void aff_element_free (AffElement *elem);
void aff_element_compute_trans (AffElement *elem, gdouble width,
gdouble height,
gdouble center_x, gdouble center_y);
void aff_element_compute_color_trans (AffElement *elem);
void aff_element_decompose_trans (AffElement *elem, Aff2 *aff,
gdouble width, gdouble height,
gdouble center_x, gdouble center_y);
void aff_element_compute_boundary (AffElement *elem, gint width,
gint height,
AffElement **elements,
int num_elements);
void aff_element_draw (AffElement *elem,
gint selected,
gint width,
gint height,
GdkDrawable *win,
GdkGC *normal_gc,
GdkGC *selected_gc,
PangoLayout *layout);
void ifs_render (AffElement **elements, gint num_elements,
gint width, gint height, gint nsteps,
IfsComposeVals *vals, gint band_y, gint band_height,
guchar *data, guchar *mask, guchar *nhits, gint preview);
gchar * ifsvals_stringify (IfsComposeVals *vals,
AffElement **elements);
gboolean ifsvals_parse_string (const gchar *str,
IfsComposeVals *vals,
AffElement ***elements);
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