gimp/plug-ins/gfig/gfig-star.c

410 lines
10 KiB
C

/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for the GIMP.
*
* Generates images containing vector type drawings.
*
* Copyright (C) 1997 Andy Thomas alt@picnic.demon.co.uk
*
* 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 "config.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "gfig.h"
#include "gfig-dobject.h"
#include "libgimp/stdplugins-intl.h"
static gint star_num_sides = 3; /* Default to three sided object */
static void d_draw_star (Dobject *obj);
static void d_paint_star (Dobject *obj);
static Dobject *d_copy_star (Dobject * obj);
gboolean
star_button_press (GtkWidget *widget,
GdkEventButton *event,
gpointer data)
{
if ((event->type == GDK_2BUTTON_PRESS) &&
(event->button == 1))
num_sides_dialog (_("Star Number of Points"),
&star_num_sides, NULL, 3, 200);
return FALSE;
}
static void
d_draw_star (Dobject *obj)
{
DobjPoints * center_pnt;
DobjPoints * outer_radius_pnt;
DobjPoints * inner_radius_pnt;
gint16 shift_x;
gint16 shift_y;
gdouble ang_grid;
gdouble ang_loop;
gdouble outer_radius;
gdouble inner_radius;
gdouble offset_angle;
gint loop;
GdkPoint start_pnt;
GdkPoint first_pnt;
gboolean do_line = FALSE;
center_pnt = obj->points;
if (!center_pnt)
return; /* End-of-line */
/* First point is the center */
/* Just draw a control point around it */
draw_sqr (&center_pnt->pnt);
/* Next point defines the radius */
outer_radius_pnt = center_pnt->next; /* this defines the vertices */
if (!outer_radius_pnt)
{
#ifdef DEBUG
g_warning ("Internal error in star - no outer vertice point \n");
#endif /* DEBUG */
return;
}
inner_radius_pnt = outer_radius_pnt->next; /* this defines the vertices */
if (!inner_radius_pnt)
{
#ifdef DEBUG
g_warning ("Internal error in star - no inner vertice point \n");
#endif /* DEBUG */
return;
}
/* Other control points */
draw_sqr (&outer_radius_pnt->pnt);
draw_sqr (&inner_radius_pnt->pnt);
/* Have center and radius - draw star */
shift_x = outer_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = outer_radius_pnt->pnt.y - center_pnt->pnt.y;
outer_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
/* Lines */
ang_grid = 2*G_PI/(2.0*(gdouble) obj->type_data);
offset_angle = atan2 (shift_y, shift_x);
shift_x = inner_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = inner_radius_pnt->pnt.y - center_pnt->pnt.y;
inner_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
for (loop = 0 ; loop < 2 * obj->type_data ; loop++)
{
gdouble lx, ly;
GdkPoint calc_pnt;
ang_loop = (gdouble)loop * ang_grid + offset_angle;
if (loop % 2)
{
lx = inner_radius * cos (ang_loop);
ly = inner_radius * sin (ang_loop);
}
else
{
lx = outer_radius * cos (ang_loop);
ly = outer_radius * sin (ang_loop);
}
calc_pnt.x = RINT (lx + center_pnt->pnt.x);
calc_pnt.y = RINT (ly + center_pnt->pnt.y);
if (do_line)
{
/* Miss out points that come to the same location */
if (calc_pnt.x == start_pnt.x && calc_pnt.y == start_pnt.y)
continue;
gfig_draw_line (calc_pnt.x, calc_pnt.y, start_pnt.x, start_pnt.y);
}
else
{
do_line = TRUE;
first_pnt = calc_pnt;
}
start_pnt = calc_pnt;
}
gfig_draw_line (first_pnt.x, first_pnt.y, start_pnt.x, start_pnt.y);
}
static void
d_paint_star (Dobject *obj)
{
/* first point center */
/* Next point is radius */
gdouble *line_pnts;
gint seg_count = 0;
gint i = 0;
DobjPoints * center_pnt;
DobjPoints * outer_radius_pnt;
DobjPoints * inner_radius_pnt;
gint16 shift_x;
gint16 shift_y;
gdouble ang_grid;
gdouble ang_loop;
gdouble outer_radius;
gdouble inner_radius;
gdouble offset_angle;
gint loop;
GdkPoint first_pnt, last_pnt;
gboolean first = TRUE;
g_assert (obj != NULL);
/* count - add one to close polygon */
seg_count = 2 * obj->type_data + 1;
center_pnt = obj->points;
if (!center_pnt || !seg_count)
return; /* no-line */
line_pnts = g_new0 (gdouble, 2 * seg_count + 1);
/* Go around all the points drawing a line from one to the next */
/* Next point defines the radius */
outer_radius_pnt = center_pnt->next; /* this defines the vetices */
if (!outer_radius_pnt)
{
#ifdef DEBUG
g_warning ("Internal error in star - no outer vertice point \n");
#endif /* DEBUG */
return;
}
inner_radius_pnt = outer_radius_pnt->next; /* this defines the vetices */
if (!inner_radius_pnt)
{
#ifdef DEBUG
g_warning ("Internal error in star - no inner vertice point \n");
#endif /* DEBUG */
return;
}
shift_x = outer_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = outer_radius_pnt->pnt.y - center_pnt->pnt.y;
outer_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
/* Lines */
ang_grid = 2*G_PI/(2.0*(gdouble) obj->type_data);
offset_angle = atan2 (shift_y, shift_x);
shift_x = inner_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = inner_radius_pnt->pnt.y - center_pnt->pnt.y;
inner_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
for (loop = 0 ; loop < 2*obj->type_data ; loop++)
{
gdouble lx, ly;
GdkPoint calc_pnt;
ang_loop = (gdouble)loop * ang_grid + offset_angle;
if (loop % 2)
{
lx = inner_radius * cos (ang_loop);
ly = inner_radius * sin (ang_loop);
}
else
{
lx = outer_radius * cos (ang_loop);
ly = outer_radius * sin (ang_loop);
}
calc_pnt.x = RINT (lx + center_pnt->pnt.x);
calc_pnt.y = RINT (ly + center_pnt->pnt.y);
/* Miss out duped pnts */
if (!first)
{
if (calc_pnt.x == last_pnt.x && calc_pnt.y == last_pnt.y)
{
continue;
}
}
line_pnts[i++] = calc_pnt.x;
line_pnts[i++] = calc_pnt.y;
last_pnt = calc_pnt;
if (first)
{
first_pnt = calc_pnt;
first = FALSE;
}
}
line_pnts[i++] = first_pnt.x;
line_pnts[i++] = first_pnt.y;
/* Reverse line if approp */
if (selvals.reverselines)
reverse_pairs_list (&line_pnts[0], i/2);
/* Scale before drawing */
if (selvals.scaletoimage)
scale_to_original_xy (&line_pnts[0], i/2);
else
scale_to_xy (&line_pnts[0], i/2);
gimp_free_select (gfig_context->image_id,
i, line_pnts,
selopt.type,
selopt.antia,
selopt.feather,
selopt.feather_radius);
paint_layer_fill ();
gimp_edit_stroke (gfig_context->drawable_id);
g_free (line_pnts);
}
static Dobject *
d_copy_star (Dobject *obj)
{
Dobject *np;
g_assert (obj->type == STAR);
np = d_new_object (STAR, obj->points->pnt.x, obj->points->pnt.y);
np->points->next = d_copy_dobjpoints (obj->points->next);
np->type_data = obj->type_data;
return np;
}
void
d_star_object_class_init ()
{
DobjClass *class = &dobj_class[STAR];
class->type = STAR;
class->name = "Star";
class->drawfunc = d_draw_star;
class->paintfunc = d_paint_star;
class->copyfunc = d_copy_star;
}
void
d_update_star (GdkPoint *pnt)
{
DobjPoints *center_pnt, *inner_pnt, *outer_pnt;
gint saved_cnt_pnt = selvals.opts.showcontrol;
/* Undraw last one then draw new one */
center_pnt = obj_creating->points;
if (!center_pnt)
return; /* No points */
/* Leave the first pnt alone -
* Edge point defines "radius"
* Only undraw if already have edge point.
*/
/* Hack - turn off cnt points in draw routine
* Looking back over the other update routines I could
* use this trick again and cut down on code size!
*/
if ((outer_pnt = center_pnt->next))
{
/* Undraw */
inner_pnt = outer_pnt->next;
draw_circle (&inner_pnt->pnt);
draw_circle (&outer_pnt->pnt);
selvals.opts.showcontrol = 0;
d_draw_star (obj_creating);
outer_pnt->pnt = *pnt;
inner_pnt->pnt.x = pnt->x + (2*(center_pnt->pnt.x - pnt->x))/3;
inner_pnt->pnt.y = pnt->y + (2*(center_pnt->pnt.y - pnt->y))/3;
}
else
{
/* Radius is a few pixels away */
/* First edge point */
d_pnt_add_line (obj_creating, pnt->x, pnt->y,-1);
outer_pnt = center_pnt->next;
/* Inner radius */
d_pnt_add_line (obj_creating,
pnt->x + (2*(center_pnt->pnt.x - pnt->x))/3,
pnt->y + (2*(center_pnt->pnt.y - pnt->y))/3,
-1);
inner_pnt = outer_pnt->next;
}
/* draw it */
selvals.opts.showcontrol = 0;
d_draw_star (obj_creating);
selvals.opts.showcontrol = saved_cnt_pnt;
/* Realy draw the control points */
draw_circle (&outer_pnt->pnt);
draw_circle (&inner_pnt->pnt);
}
void
d_star_start (GdkPoint *pnt,
gint shift_down)
{
obj_creating = d_new_object (STAR, pnt->x, pnt->y);
obj_creating->type_data = star_num_sides;
}
void
d_star_end (GdkPoint *pnt,
gint shift_down)
{
draw_circle (pnt);
add_to_all_obj (gfig_context->current_obj, obj_creating);
obj_creating = NULL;
}