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-rw-r--r--plug-ins/gfig/gfig-star.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/plug-ins/gfig/gfig-star.c b/plug-ins/gfig/gfig-star.c
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+++ b/plug-ins/gfig/gfig-star.c
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+/*
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This is a plug-in for 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 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 <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "gfig.h"
+#include "gfig-line.h"
+#include "gfig-dobject.h"
+#include "gfig-star.h"
+#include "gfig-dialog.h"
+
+#include "libgimp/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)
+ {
+ gimp_context_push ();
+ gimp_context_set_antialias (selopt.antia);
+ gimp_context_set_feather (selopt.feather);
+ gimp_context_set_feather_radius (selopt.feather_radius, selopt.feather_radius);
+ gimp_image_select_polygon (gfig_context->image_id,
+ selopt.type,
+ i, line_pnts);
+ gimp_context_pop ();
+
+ paint_layer_fill (min_max[0], min_max[1], min_max[2], min_max[3]);
+ gimp_selection_none (gfig_context->image_id);
+ }
+
+ if (obj->style.paint_type == PAINT_BRUSH_TYPE)
+ gfig_paint (selvals.brshtype, gfig_context->drawable_id, 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 (GdkPoint *pnt,
+ gboolean shift_down)
+{
+ add_to_all_obj (gfig_context->current_obj, obj_creating);
+ obj_creating = NULL;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 06:29:09 +0000