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-rw-r--r--plug-ins/gfig/gfig-spiral.c316
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diff --git a/plug-ins/gfig/gfig-spiral.c b/plug-ins/gfig/gfig-spiral.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 <stdlib.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "gfig.h"
+#include "gfig-dobject.h"
+#include "gfig-line.h"
+#include "gfig-spiral.h"
+#include "gfig-dialog.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+static void d_draw_spiral (GfigObject *obj,
+ cairo_t *cr);
+static void d_paint_spiral (GfigObject *obj);
+static GfigObject *d_copy_spiral (GfigObject *obj);
+
+static void d_update_spiral (GdkPoint *pnt);
+
+static gint spiral_num_turns = 4; /* Default to 4 turns */
+static gint spiral_toggle = 0; /* 0 = clockwise -1 = anti-clockwise */
+
+void
+tool_options_spiral (GtkWidget *notebook)
+{
+ GtkWidget *sides;
+
+ sides = num_sides_widget (_("Spiral Number of Turns"),
+ &spiral_num_turns, &spiral_toggle, 1, 20);
+ gtk_notebook_append_page (GTK_NOTEBOOK (notebook), sides, NULL);
+}
+
+static void
+d_draw_spiral (GfigObject *obj,
+ cairo_t *cr)
+{
+ DobjPoints *center_pnt;
+ DobjPoints *radius_pnt;
+ gint16 shift_x;
+ gint16 shift_y;
+ gdouble ang_grid;
+ gdouble ang_loop;
+ gdouble radius;
+ gdouble offset_angle;
+ gdouble sp_cons;
+ gint loop;
+ GdkPoint start_pnt = { 0, 0 };
+ gboolean do_line = FALSE;
+ gint clock_wise = 1;
+
+ 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 */
+ radius_pnt = center_pnt->next; /* this defines the vetices */
+
+ if (!radius_pnt)
+ {
+#ifdef DEBUG
+ g_warning ("Internal error in spiral - no vertice point \n");
+#endif /* DEBUG */
+ return;
+ }
+
+ /* Other control point */
+ if (obj_creating == obj)
+ draw_circle (&radius_pnt->pnt, TRUE, cr);
+ else
+ draw_sqr (&radius_pnt->pnt, obj == gfig_context->selected_obj, cr);
+
+ /* Have center and radius - draw spiral */
+
+ shift_x = radius_pnt->pnt.x - center_pnt->pnt.x;
+ shift_y = radius_pnt->pnt.y - center_pnt->pnt.y;
+
+ radius = sqrt ((shift_x * shift_x) + (shift_y * shift_y));
+
+ offset_angle = atan2 (shift_y, shift_x);
+
+ clock_wise = obj->type_data / abs (obj->type_data);
+
+ if (offset_angle < 0)
+ offset_angle += 2.0 * G_PI;
+
+ sp_cons = radius/(obj->type_data * 2 * G_PI + offset_angle);
+ /* Lines */
+ ang_grid = 2.0 * G_PI / 180.0;
+
+
+ for (loop = 0 ; loop <= abs (obj->type_data * 180) +
+ clock_wise * (gint)RINT (offset_angle/ang_grid) ; loop++)
+ {
+ gdouble lx, ly;
+ GdkPoint calc_pnt;
+
+ ang_loop = (gdouble)loop * ang_grid;
+
+ lx = sp_cons * ang_loop * cos (ang_loop)*clock_wise;
+ ly = sp_cons * ang_loop * 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;
+ }
+ start_pnt = calc_pnt;
+ }
+}
+
+static void
+d_paint_spiral (GfigObject *obj)
+{
+ /* first point center */
+ /* Next point is radius */
+ gdouble *line_pnts;
+ gint seg_count = 0;
+ gint i = 0;
+ DobjPoints *center_pnt;
+ DobjPoints *radius_pnt;
+ gint16 shift_x;
+ gint16 shift_y;
+ gdouble ang_grid;
+ gdouble ang_loop;
+ gdouble radius;
+ gdouble offset_angle;
+ gdouble sp_cons;
+ gint loop;
+ GdkPoint last_pnt = { 0, 0 };
+ gint clock_wise = 1;
+
+ g_assert (obj != NULL);
+
+ center_pnt = obj->points;
+
+ if (!center_pnt || !center_pnt->next)
+ return; /* no-line */
+
+ /* Go around all the points drawing a line from one to the next */
+
+ radius_pnt = center_pnt->next; /* this defines the vetices */
+
+ /* Have center and radius - get lines */
+ shift_x = radius_pnt->pnt.x - center_pnt->pnt.x;
+ shift_y = radius_pnt->pnt.y - center_pnt->pnt.y;
+
+ radius = sqrt ((shift_x * shift_x) + (shift_y * shift_y));
+
+ clock_wise = obj->type_data / abs (obj->type_data);
+
+ offset_angle = atan2 (shift_y, shift_x);
+
+ if (offset_angle < 0)
+ offset_angle += 2.0 * G_PI;
+
+ sp_cons = radius/(obj->type_data * 2.0 * G_PI + offset_angle);
+ /* Lines */
+ ang_grid = 2.0 * G_PI / 180.0;
+
+ /* count - */
+ seg_count = abs (obj->type_data * 180.0) + clock_wise * (gint)RINT (offset_angle/ang_grid);
+
+ line_pnts = g_new0 (gdouble, 2 * seg_count + 3);
+
+ for (loop = 0 ; loop <= seg_count; loop++)
+ {
+ gdouble lx, ly;
+ GdkPoint calc_pnt;
+
+ ang_loop = (gdouble)loop * ang_grid;
+
+ lx = sp_cons * ang_loop * cos (ang_loop)*clock_wise;
+ ly = sp_cons * ang_loop * 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 (!loop)
+ {
+ 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;
+ }
+
+ /* Scale before drawing */
+ if (selvals.scaletoimage)
+ scale_to_original_xy (&line_pnts[0], i / 2);
+ else
+ scale_to_xy (&line_pnts[0], i / 2);
+
+ /* One go */
+ if (obj->style.paint_type == PAINT_BRUSH_TYPE)
+ {
+ gfig_paint (selvals.brshtype,
+ gfig_context->drawable_id,
+ i, line_pnts);
+ }
+
+ g_free (line_pnts);
+}
+
+static GfigObject *
+d_copy_spiral (GfigObject *obj)
+{
+ GfigObject *np;
+
+ g_assert (obj->type == SPIRAL);
+
+ np = d_new_object (SPIRAL, 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_spiral_object_class_init (void)
+{
+ GfigObjectClass *class = &dobj_class[SPIRAL];
+
+ class->type = SPIRAL;
+ class->name = "SPIRAL";
+ class->drawfunc = d_draw_spiral;
+ class->paintfunc = d_paint_spiral;
+ class->copyfunc = d_copy_spiral;
+ class->update = d_update_spiral;
+}
+
+static void
+d_update_spiral (GdkPoint *pnt)
+{
+ DobjPoints *center_pnt;
+ DobjPoints *edge_pnt;
+
+ center_pnt = obj_creating->points;
+
+ if (!center_pnt)
+ return; /* No points */
+
+ if ((edge_pnt = center_pnt->next))
+ {
+ edge_pnt->pnt = *pnt;
+ }
+ else
+ {
+ /* Radius is a few pixels away */
+ /* First edge point */
+ d_pnt_add_line (obj_creating, pnt->x, pnt->y, -1);
+ }
+}
+
+void
+d_spiral_start (GdkPoint *pnt,
+ gboolean shift_down)
+{
+ obj_creating = d_new_object (SPIRAL, pnt->x, pnt->y);
+ obj_creating->type_data = spiral_num_turns * ((spiral_toggle == 0) ? 1 : -1);
+}
+
+void
+d_spiral_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 2024-12-14 10:03:41 +0000