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

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2023-09-26 00:35:21 +02:00
/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for PIKA.
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*
*/
#include "config.h"
#include <libpika/pika.h>
#include <libpika/pikaui.h>
#include "gfig.h"
#include "gfig-line.h"
#include "gfig-dobject.h"
#include "gfig-star.h"
#include "gfig-dialog.h"
#include "libpika/stdplugins-intl.h"
static gint star_num_sides = 3; /* Default to three sided object */
static void d_draw_star (GfigObject *obj,
cairo_t *cr);
static void d_paint_star (GfigObject *obj);
static GfigObject *d_copy_star (GfigObject *obj);
static void d_update_star (GdkPoint *pnt);
void
tool_options_star (GtkWidget *notebook)
{
GtkWidget *sides;
sides = num_sides_widget (_("Star Number of Points"),
&star_num_sides, NULL, 3, 200);
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), sides, NULL);
}
static void
d_draw_star (GfigObject *obj,
cairo_t *cr)
{
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 = { 0, 0 };
GdkPoint first_pnt = { 0, 0 };
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, obj == gfig_context->selected_obj, cr);
/* Next point defines the radius */
outer_radius_pnt = center_pnt->next; /* this defines the vertices */
if (!outer_radius_pnt)
{
return;
}
inner_radius_pnt = outer_radius_pnt->next; /* this defines the vertices */
if (!inner_radius_pnt)
{
return;
}
/* Other control points */
if (obj == obj_creating)
{
draw_circle (&outer_radius_pnt->pnt, TRUE, cr);
draw_circle (&inner_radius_pnt->pnt, TRUE, cr);
}
else
{
draw_sqr (&outer_radius_pnt->pnt, obj == gfig_context->selected_obj, cr);
draw_sqr (&inner_radius_pnt->pnt, obj == gfig_context->selected_obj, cr);
}
/* 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 = 2.0 * 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, cr);
}
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, cr);
}
static void
d_paint_star (GfigObject *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 = { 0, 0 };
GdkPoint last_pnt = { 0, 0 };
gboolean first = TRUE;
gdouble *min_max;
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);
min_max = g_new (gdouble, 4);
/* 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 */
g_free (line_pnts);
g_free (min_max);
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 */
g_free (line_pnts);
g_free (min_max);
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 = 2.0 * 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;
min_max[0] = min_max[2] = calc_pnt.x;
min_max[1] = min_max[3] = calc_pnt.y;
}
else
{
min_max[0] = MIN (min_max[0], calc_pnt.x);
min_max[1] = MIN (min_max[1], calc_pnt.y);
min_max[2] = MAX (min_max[2], calc_pnt.x);
min_max[3] = MAX (min_max[3], calc_pnt.y);
}
}
line_pnts[i++] = first_pnt.x;
line_pnts[i++] = first_pnt.y;
/* Scale before drawing */
if (selvals.scaletoimage)
{
scale_to_original_xy (&line_pnts[0], i / 2);
scale_to_original_xy (min_max, 2);
}
else
{
scale_to_xy (&line_pnts[0], i / 2);
scale_to_xy (min_max, 2);
}
if (gfig_context_get_current_style ()->fill_type != FILL_NONE)
{
pika_context_push ();
pika_context_set_antialias (selopt.antia);
pika_context_set_feather (selopt.feather);
pika_context_set_feather_radius (selopt.feather_radius, selopt.feather_radius);
pika_image_select_polygon (gfig_context->image,
selopt.type,
i, line_pnts);
pika_context_pop ();
paint_layer_fill (min_max[0], min_max[1], min_max[2], min_max[3]);
pika_selection_none (gfig_context->image);
}
if (obj->style.paint_type == PAINT_BRUSH_TYPE)
gfig_paint (selvals.brshtype, gfig_context->drawable, i, line_pnts);
g_free (line_pnts);
g_free (min_max);
}
static GfigObject *
d_copy_star (GfigObject *obj)
{
GfigObject *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 (void)
{
GfigObjectClass *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;
class->update = d_update_star;
}
static void
d_update_star (GdkPoint *pnt)
{
DobjPoints *center_pnt, *inner_pnt, *outer_pnt;
center_pnt = obj_creating->points;
if (!center_pnt)
return; /* No points */
if ((outer_pnt = center_pnt->next))
{
inner_pnt = outer_pnt->next;
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);
/* 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);
}
}
void
d_star_start (GdkPoint *pnt,
gboolean shift_down)
{
obj_creating = d_new_object (STAR, pnt->x, pnt->y);
obj_creating->type_data = star_num_sides;
}
void
d_star_end (PikaGfig *gfig,
GdkPoint *pnt,
gboolean shift_down)
{
add_to_all_obj (gfig, gfig_context->current_obj, obj_creating);
obj_creating = NULL;
}