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/*
* Copyright (c) 2009 Tadej Borovšak <tadeboro@gmail.com>
*
* 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 Library 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 <cairo.h>
#include <glib.h>
#include <math.h>
/* Local functions declarations */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gdouble initial_rotation,
gint direction );
/* Plug-in API */
void
img_get_plugin_info( gchar **group,
gchar ***trans )
{
gint i = 0;
*group = "Clock Wipe";
*trans = g_new( gchar *, 25 );
(*trans)[i++] = "Clockwise Twelve";
(*trans)[i++] = "img_ctw";
(*trans)[i++] = GINT_TO_POINTER( 40 );
(*trans)[i++] = "Counter Clockwise Twelve";
(*trans)[i++] = "img_cctw";
(*trans)[i++] = GINT_TO_POINTER( 41 );
(*trans)[i++] = "Clockwise Three";
(*trans)[i++] = "img_cth";
(*trans)[i++] = GINT_TO_POINTER( 42 );
(*trans)[i++] = "Counter Clockwise Three";
(*trans)[i++] = "img_ccth";
(*trans)[i++] = GINT_TO_POINTER( 43 );
(*trans)[i++] = "Clockwise Six";
(*trans)[i++] = "img_csi";
(*trans)[i++] = GINT_TO_POINTER( 44 );
(*trans)[i++] = "Counter Clockwise Six";
(*trans)[i++] = "img_ccsi";
(*trans)[i++] = GINT_TO_POINTER( 45 );
(*trans)[i++] = "Clockwise Nine";
(*trans)[i++] = "img_cni";
(*trans)[i++] = GINT_TO_POINTER( 46 );
(*trans)[i++] = "Counter Clockwise Nine";
(*trans)[i++] = "img_ccni";
(*trans)[i++] = GINT_TO_POINTER( 47 );
(*trans)[i++] = NULL;
}
void
img_ctw(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 3, 1 );
}
void
img_cth(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 0, 1 );
}
void
img_csi(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 1, 1 );
}
void
img_cni(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 2, 1 );
}
void
img_cctw(cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 3, -1 );
}
void
img_ccth( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 0, -1 );
}
void
img_ccsi( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 1, -1 );
}
void
img_ccni( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress)
{
transition_render( cr, image_from, image_to, progress, 2, -1 );
}
/* Local functions definitions */
static void
transition_render( cairo_t *cr,
cairo_surface_t *image_from,
cairo_surface_t *image_to,
gdouble progress,
gdouble initial_rotation,
gint direction )
{
gint width, height;
gdouble begin, end;
gdouble diag;
width = cairo_image_surface_get_width( image_from );
height = cairo_image_surface_get_height( image_from );
cairo_set_source_surface( cr, image_from, 0, 0 );
cairo_paint( cr );
diag = sqrt( ( width * width ) + ( height * height ) );
cairo_set_source_surface( cr, image_to, 0, 0 );
cairo_move_to( cr, width / 2 , height / 2 );
begin = initial_rotation / 2 * G_PI;
end = begin + direction * progress * 2 * G_PI;
if( begin < end )
cairo_arc( cr, width / 2, height / 2, diag, begin, end );
else
cairo_arc( cr, width / 2, height / 2, diag, end, begin );
cairo_close_path( cr );
cairo_fill( cr );
}
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