зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
2.4 KiB
C
93 строки
2.4 KiB
C
/* Libart_LGPL - library of basic graphic primitives
|
|
* Copyright (C) 1998 Raph Levien
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/* Basic constructors and operations for bezier paths */
|
|
|
|
#include "config.h"
|
|
#include "art_bpath.h"
|
|
|
|
#include <math.h>
|
|
|
|
|
|
/**
|
|
* art_bpath_affine_transform: Affine transform an #ArtBpath.
|
|
* @src: The source #ArtBpath.
|
|
* @matrix: The affine transform.
|
|
*
|
|
* Affine transform the bezpath, returning a newly allocated #ArtBpath
|
|
* (allocated using art_alloc()).
|
|
*
|
|
* Result (x', y') = (matrix[0] * x + matrix[2] * y + matrix[4],
|
|
* matrix[1] * x + matrix[3] * y + matrix[5])
|
|
*
|
|
* Return value: the transformed #ArtBpath.
|
|
**/
|
|
ArtBpath *
|
|
art_bpath_affine_transform (const ArtBpath *src, const double matrix[6])
|
|
{
|
|
int i;
|
|
int size;
|
|
ArtBpath *new;
|
|
ArtPathcode code;
|
|
double x, y;
|
|
|
|
for (i = 0; src[i].code != ART_END; i++);
|
|
size = i;
|
|
|
|
new = art_new (ArtBpath, size + 1);
|
|
|
|
for (i = 0; i < size; i++)
|
|
{
|
|
code = src[i].code;
|
|
new[i].code = code;
|
|
if (code == ART_CURVETO)
|
|
{
|
|
x = src[i].x1;
|
|
y = src[i].y1;
|
|
new[i].x1 = matrix[0] * x + matrix[2] * y + matrix[4];
|
|
new[i].y1 = matrix[1] * x + matrix[3] * y + matrix[5];
|
|
x = src[i].x2;
|
|
y = src[i].y2;
|
|
new[i].x2 = matrix[0] * x + matrix[2] * y + matrix[4];
|
|
new[i].y2 = matrix[1] * x + matrix[3] * y + matrix[5];
|
|
}
|
|
else
|
|
{
|
|
new[i].x1 = 0;
|
|
new[i].y1 = 0;
|
|
new[i].x2 = 0;
|
|
new[i].y2 = 0;
|
|
}
|
|
x = src[i].x3;
|
|
y = src[i].y3;
|
|
new[i].x3 = matrix[0] * x + matrix[2] * y + matrix[4];
|
|
new[i].y3 = matrix[1] * x + matrix[3] * y + matrix[5];
|
|
}
|
|
new[i].code = ART_END;
|
|
new[i].x1 = 0;
|
|
new[i].y1 = 0;
|
|
new[i].x2 = 0;
|
|
new[i].y2 = 0;
|
|
new[i].x3 = 0;
|
|
new[i].y3 = 0;
|
|
|
|
return new;
|
|
}
|
|
|