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/* This file is part of libccc, criawips' cairo-based canvas
*
* AUTHORS
* Sven Herzberg <herzi@gnome-de.org>
*
* Copyright (C) 2006 Sven Herzberg <herzi@gnome-de.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 "cc-circle.h"
#include <math.h>
CcItem*
cc_circle_new(void) {
return g_object_new(CC_TYPE_CIRCLE, NULL);
}
void
cc_circle_set_anchor(CcCircle* self, gdouble x, gdouble y) {
g_return_if_fail(CC_IS_CIRCLE(self));
if(self->x == x && self->y == y) {
return;
}
self->x = x;
self->y = y;
cc_item_update_bounds(CC_ITEM(self), NULL);
g_object_notify(G_OBJECT(self), "anchor");
}
void
cc_circle_set_radius(CcCircle* self, gdouble radius) {
CcDRect dirty;
CcItem* item;
g_return_if_fail(CC_IS_CIRCLE(self));
if(self->radius == radius) {
return;
}
item = CC_ITEM(self);
dirty.x1 = self->x - MAX(radius, self->radius);
dirty.y1 = self->y - MAX(radius, self->radius);
dirty.x2 = self->x + MAX(radius, self->radius);
dirty.y2 = self->y + MAX(radius, self->radius);
self->radius = radius;
g_object_notify(G_OBJECT(self), "radius");
cc_item_dirty(item, NULL, dirty);
cc_item_update_bounds(item, NULL);
}
/* GType */
G_DEFINE_TYPE(CcCircle, cc_circle, CC_TYPE_SHAPE);
enum {
PROP_O,
PROP_ANCHOR,
PROP_RADIUS
};
static void
cc_circle_init(CcCircle* self) {}
static void
cc_get_property(GObject* object, guint prop_id, GValue* value, GParamSpec* pspec) {
CcCircle* self = CC_CIRCLE(object);
switch(prop_id) {
case PROP_RADIUS:
g_value_set_double(value, self->radius);
break;
case PROP_ANCHOR:
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static void
cc_set_property(GObject* object, guint prop_id, GValue const* value, GParamSpec* pspec) {
CcCircle* self = CC_CIRCLE(object);
switch(prop_id) {
case PROP_RADIUS:
cc_circle_set_radius(self, g_value_get_double(value));
break;
case PROP_ANCHOR:
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static gdouble
cc_distance(CcItem* item, gdouble x, gdouble y, CcItem** found) {
gdouble distance = 0.0;
CcCircle* self = NULL;
// search the children first
distance = CC_ITEM_CLASS(cc_circle_parent_class)->distance(item, x, y, found);
if(*found) {
return distance;
}
self = CC_CIRCLE(item);
distance = sqrt(pow(x - self->x, 2.0) + pow(y - self->y, 2));
if(distance <= self->radius + 0.5 * CC_SHAPE(self)->width) {
distance = 0.0;
*found = item;
} else {
distance -= self->radius;
}
return distance;
}
static void
cc_update_bounds(CcItem* item, CcView const* view, gpointer data) {
CcCircle* self = CC_CIRCLE(item);
gdouble w_2 = 0.5 * CC_SHAPE(self)->width;
CcDRect new_bounds = {
self->x - self->radius - w_2,
self->y - self->radius - w_2,
self->x + self->radius + w_2,
self->y + self->radius + w_2
};
CcDRect* bounds = cc_hash_map_lookup(item->bounds, view);
if(!bounds || !cc_d_rect_equal(*bounds, new_bounds)) {
if(bounds) {
cc_item_dirty(item, view, *bounds);
cc_hash_map_remove(item->bounds, view);
}
cc_hash_map_insert(item->bounds, (gpointer)view, cc_d_rect_copy(&new_bounds));
cc_item_dirty(item, view, new_bounds);
cc_item_bounds_changed(item, view);
}
}
static void
cc_path(CcShape* shape, CcView* view, cairo_t* cr) {
CcCircle* self = CC_CIRCLE(shape);
gdouble x = self->x,
y = self->y,
r = self->radius,
tmp = 0.0;
cc_view_world_to_window(view, &x, &y);
cc_view_world_to_window_distance(view, &r, &tmp);
cairo_arc(cr, x, y, r, 0.0, 2*G_PI);
}
static void
cc_circle_class_init(CcCircleClass* self_class) {
GObjectClass* go_class;
CcItemClass * ci_class;
CcShapeClass* cs_class;
/* GObjectClass */
go_class = G_OBJECT_CLASS(self_class);
go_class->get_property = cc_get_property;
go_class->set_property = cc_set_property;
g_object_class_install_property(go_class,
PROP_ANCHOR,
g_param_spec_pointer("anchor",
"Anchor",
"The center of the circle",
0));
g_object_class_install_property(go_class,
PROP_RADIUS,
g_param_spec_double("radius",
"Radius",
"Radius",
0.0,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
/* CcItemClass */
ci_class = CC_ITEM_CLASS(self_class);
ci_class->distance = cc_distance;
ci_class->update_bounds = cc_update_bounds;
/* CcShapeClass */
cs_class = CC_SHAPE_CLASS(self_class);
cs_class->path = cc_path;
}
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