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gimp/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 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 <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);
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)
{
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 };
GdkPoint first_pnt;
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);
/* 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 */
draw_sqr (&radius_pnt->pnt, obj == gfig_context->selected_obj);
/* 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);
}
else
{
do_line = TRUE;
first_pnt = calc_pnt;
}
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;
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 ((edge_pnt = center_pnt->next))
{
/* Undraw */
draw_circle (&edge_pnt->pnt, TRUE);
selvals.opts.showcontrol = 0;
d_draw_spiral (obj_creating);
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);
edge_pnt = center_pnt->next;
}
/* draw it */
selvals.opts.showcontrol = 0;
d_draw_spiral (obj_creating);
selvals.opts.showcontrol = saved_cnt_pnt;
/* Realy draw the control points */
draw_circle (&edge_pnt->pnt, TRUE);
}
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)
{
draw_circle (pnt, TRUE);
add_to_all_obj (gfig_context->current_obj, obj_creating);
obj_creating = NULL;
}
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