You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.5 KiB
83 lines
2.5 KiB
/* This file is part of the KDE project
|
|
Copyright (C) 2002, 2003 The Karbon Developers
|
|
|
|
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; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "vflattencmd.h"
|
|
#include <klocale.h>
|
|
|
|
#include <core/vpath.h>
|
|
#include <core/vsegment.h>
|
|
|
|
// TODO: Think about if we want to adapt this:
|
|
|
|
/*
|
|
* <cite from GNU ghostscript's gxpflat.c>
|
|
*
|
|
* To calculate how many points to sample along a path in order to
|
|
* approximate it to the desired degree of flatness, we define
|
|
* dist((x,y)) = abs(x) + abs(y);
|
|
* then the number of points we need is
|
|
* N = 1 + sqrt(3/4 * D / flatness),
|
|
* where
|
|
* D = max(dist(p0 - 2*p1 + p2), dist(p1 - 2*p2 + p3)).
|
|
* Since we are going to use a power of 2 for the number of intervals,
|
|
* we can avoid the square root by letting
|
|
* N = 1 + 2^(ceiling(log2(3/4 * D / flatness) / 2)).
|
|
* (Reference: DEC Paris Research Laboratory report #1, May 1989.)
|
|
*
|
|
* We treat two cases specially. First, if the curve is very
|
|
* short, we halve the flatness, to avoid turning short shallow curves
|
|
* into short straight lines. Second, if the curve forms part of a
|
|
* character (indicated by flatness = 0), we let
|
|
* N = 1 + 2 * max(abs(x3-x0), abs(y3-y0)).
|
|
* This is probably too conservative, but it produces good results.
|
|
*
|
|
* </cite from GNU ghostscript's gxpflat.c>
|
|
*/
|
|
|
|
|
|
VFlattenCmd::VFlattenCmd( VDocument *doc, double flatness )
|
|
: VReplacingCmd( doc, i18n( "Flatten Curves" ) )
|
|
{
|
|
m_flatness = flatness > 0.0 ? flatness : 1.0;
|
|
}
|
|
|
|
void
|
|
VFlattenCmd::visitVSubpath( VSubpath& path )
|
|
{
|
|
path.first();
|
|
|
|
// Ommit first segment.
|
|
while( path.next() )
|
|
{
|
|
while( !path.current()->isFlat( m_flatness ) )
|
|
{
|
|
// Split at midpoint.
|
|
path.insert(
|
|
path.current()->splitAt( 0.5 ) );
|
|
}
|
|
|
|
// Convert to line.
|
|
path.current()->setDegree( 1 );
|
|
|
|
if( !success() )
|
|
setSuccess();
|
|
}
|
|
}
|
|
|