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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension.h"
/* Canvas color pigment callback */
static dmnsn_color dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment,
dmnsn_vector v);
static void dmnsn_canvas_pigment_free_fn(void *ptr);
/* Create a canvas color */
dmnsn_pigment *
dmnsn_new_canvas_pigment(dmnsn_canvas *canvas)
{
dmnsn_pigment *pigment = dmnsn_new_pigment();
pigment->pigment_fn = &dmnsn_canvas_pigment_fn;
pigment->free_fn = &dmnsn_canvas_pigment_free_fn;
pigment->ptr = canvas;
return pigment;
}
/* Canvas color callback */
static dmnsn_color
dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment, dmnsn_vector v)
{
v = dmnsn_matrix_vector_mul(pigment->trans_inv, v);
dmnsn_canvas *canvas = pigment->ptr;
int x = (fmod(v.x, 1.0) + 1.0)*(canvas->x - 1) + 0.5;
int y = (fmod(v.y, 1.0) + 1.0)*(canvas->y - 1) + 0.5;
dmnsn_color c = dmnsn_get_pixel(canvas, x%canvas->x, y%canvas->y);
return c;
}
static void
dmnsn_canvas_pigment_free_fn(void *ptr)
{
dmnsn_delete_canvas(ptr);
}
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