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

239 lines
5.9 KiB
C

/*
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "gfig.h"
#include "gfig-dobject.h"
#include "gfig-poly.h"
#include "gfig-circle.h"
#include "libgimp/stdplugins-intl.h"
static gint calc_radius (GdkPoint *center,
GdkPoint *edge);
static void d_draw_circle (GfigObject *obj);
static void d_paint_circle (GfigObject *obj);
static GfigObject *d_copy_circle (GfigObject *obj);
static void d_update_circle (GdkPoint *pnt);
static gint
calc_radius (GdkPoint *center, GdkPoint *edge)
{
gint dx = center->x - edge->x;
gint dy = center->y - edge->y;
return (gint) sqrt (dx * dx + dy * dy);
}
static void
d_draw_circle (GfigObject *obj)
{
DobjPoints *center_pnt;
DobjPoints *edge_pnt;
gint radius;
center_pnt = obj->points;
if (!center_pnt)
return; /* End-of-line */
edge_pnt = center_pnt->next;
if (!edge_pnt)
{
g_warning ("Internal error - circle no edge pnt");
}
radius = calc_radius (&center_pnt->pnt, &edge_pnt->pnt);
draw_sqr (&center_pnt->pnt, obj == gfig_context->selected_obj);
draw_sqr (&edge_pnt->pnt, obj == gfig_context->selected_obj);
gfig_draw_arc (center_pnt->pnt.x, center_pnt->pnt.y,
radius, radius, 0, 360);
}
static void
d_paint_circle (GfigObject *obj)
{
DobjPoints *center_pnt;
DobjPoints *edge_pnt;
gint radius;
gdouble dpnts[4];
g_assert (obj != NULL);
/* Drawing circles is hard .
* 1) select circle
* 2) stroke it
*/
center_pnt = obj->points;
if (!center_pnt)
return; /* End-of-line */
edge_pnt = center_pnt->next;
if (!edge_pnt)
{
g_error ("Internal error - circle no edge pnt");
}
radius = calc_radius (&center_pnt->pnt, &edge_pnt->pnt);
dpnts[0] = (gdouble) center_pnt->pnt.x - radius;
dpnts[1] = (gdouble) center_pnt->pnt.y - radius;
dpnts[3] = dpnts[2] = (gdouble) radius * 2;
/* Scale before drawing */
if (selvals.scaletoimage)
scale_to_original_xy (&dpnts[0], 2);
else
scale_to_xy (&dpnts[0], 2);
gimp_ellipse_select (gfig_context->image_id,
dpnts[0], dpnts[1],
dpnts[2], dpnts[3],
selopt.type,
selopt.antia,
selopt.feather,
selopt.feather_radius);
paint_layer_fill (center_pnt->pnt.x - radius,
center_pnt->pnt.y - radius,
center_pnt->pnt.x + radius,
center_pnt->pnt.y + radius);
if (obj->style.paint_type == PAINT_BRUSH_TYPE)
gimp_edit_stroke (gfig_context->drawable_id);
}
static GfigObject *
d_copy_circle (GfigObject * obj)
{
GfigObject *nc;
g_assert (obj->type == CIRCLE);
nc = d_new_object (CIRCLE, obj->points->pnt.x, obj->points->pnt.y);
nc->points->next = d_copy_dobjpoints (obj->points->next);
return nc;
}
void
d_circle_object_class_init (void)
{
GfigObjectClass *class = &dobj_class[CIRCLE];
class->type = CIRCLE;
class->name = "CIRCLE";
class->drawfunc = d_draw_circle;
class->paintfunc = d_paint_circle;
class->copyfunc = d_copy_circle;
class->update = d_update_circle;
}
static void
d_update_circle (GdkPoint *pnt)
{
DobjPoints *center_pnt, *edge_pnt;
gint radius;
/* Undraw last one then draw new one */
center_pnt = obj_creating->points;
if (!center_pnt)
return; /* No points */
if ((edge_pnt = center_pnt->next))
{
/* Undraw current */
draw_circle (&edge_pnt->pnt, TRUE);
radius = calc_radius (&center_pnt->pnt, &edge_pnt->pnt);
gdk_draw_arc (gfig_context->preview->window,
gfig_gc,
0,
center_pnt->pnt.x - (gint) RINT (radius),
center_pnt->pnt.y - (gint) RINT (radius),
(gint) RINT (radius) * 2,
(gint) RINT (radius) * 2,
0,
360 * 64);
edge_pnt->pnt = *pnt;
}
else
{
edge_pnt = new_dobjpoint (pnt->x, pnt->y);
center_pnt->next = edge_pnt;
}
draw_circle (&edge_pnt->pnt, TRUE);
radius = calc_radius (&center_pnt->pnt, &edge_pnt->pnt);
gdk_draw_arc (gfig_context->preview->window,
gfig_gc,
0,
center_pnt->pnt.x - (gint) RINT (radius),
center_pnt->pnt.y - (gint) RINT (radius),
(gint) RINT (radius) * 2,
(gint) RINT (radius) * 2,
0,
360 * 64);
}
void
d_circle_start (GdkPoint *pnt,
gboolean shift_down)
{
obj_creating = d_new_object (CIRCLE, pnt->x, pnt->y);
}
void
d_circle_end (GdkPoint *pnt,
gboolean shift_down)
{
/* Under contrl point */
if (!obj_creating->points->next)
{
/* No circle created */
free_one_obj (obj_creating);
}
else
{
draw_circle (pnt, TRUE);
add_to_all_obj (gfig_context->current_obj, obj_creating);
}
obj_creating = NULL;
}