500 lines
15 KiB
C++
500 lines
15 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 1992-2010 jean-pierre.charras
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* Copyright (C) 1992-2010 Kicad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <math.h>
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// For some unknown reasons, polygon.hpp shoul be included first
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#include "boost/polygon/polygon.hpp"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vector>
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#include "potracelib.h"
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#include "auxiliary.h"
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#ifndef max
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#define max( a, b ) ( ( (a) > (b) ) ? (a) : (b) )
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#endif
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#ifndef min
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#define min( a, b ) ( ( (a) < (b) ) ? (a) : (b) )
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#endif
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// Define some types used here from boost::polygon
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namespace bpl = boost::polygon; // bpl = boost polygon library
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using namespace bpl::operators; // +, -, =, ...
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typedef int coordinate_type;
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typedef bpl::polygon_data<coordinate_type> KPolygon; // define a basic polygon
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typedef std::vector<KPolygon> KPolygonSet; // define a set of polygons
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typedef bpl::point_data<coordinate_type> KPolyPoint; // define a corner of a polygon
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enum output_format {
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POSTSCRIPT_FMT = 1,
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PCBNEW_FMT,
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EESCHEMA_FMT
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};
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/* free a potrace bitmap */
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static void bm_free( potrace_bitmap_t* bm )
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{
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if( bm != NULL )
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{
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free( bm->map );
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}
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free( bm );
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}
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/* Helper class to handle useful info to convert a bitmap image to
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* a polygonal object description
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*/
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class BITMAPCONV_INFO
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{
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public:
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enum output_format m_Format; // File format
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int m_PixmapWidth;
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int m_PixmapHeight; // the bitmap size in pixels
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double m_ScaleX;
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double m_ScaleY; // the conversion scale
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potrace_path_t* m_Paths; // the list of paths, from potrace (list of lines and bezier curves)
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FILE* m_Outfile; // File to create
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const char * m_CmpName; // The string used as cmp/footprint name
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public:
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BITMAPCONV_INFO();
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/**
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* Function CreateOutputFile
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* Creates the output file specified by m_Outfile,
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* depending on file format given by m_Format
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*/
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void CreateOutputFile();
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private:
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/**
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* Function OuputFileHeader
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* write to file the header depending on file format
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*/
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void OuputFileHeader();
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/**
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* Function OuputFileEnd
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* write to file the last strings depending on file format
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*/
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void OuputFileEnd();
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/**
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* Function OuputOnePolygon
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* write one polygon to output file.
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* Polygon coordinates are expected scaled by the polugon extraction function
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*/
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void OuputOnePolygon( KPolygon & aPolygon );
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};
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static void BezierToPolyline( std::vector <potrace_dpoint_t>& aCornersBuffer,
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potrace_dpoint_t p1,
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potrace_dpoint_t p2,
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potrace_dpoint_t p3,
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potrace_dpoint_t p4 );
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BITMAPCONV_INFO::BITMAPCONV_INFO()
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{
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m_Format = POSTSCRIPT_FMT;
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m_PixmapWidth = 0;
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m_PixmapHeight = 0;
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m_ScaleX = 1.0;
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m_ScaleY = 1.0;
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m_Paths = NULL;
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m_Outfile = NULL;
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m_CmpName = "LOGO";
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}
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int bitmap2component( potrace_bitmap_t* aPotrace_bitmap, FILE* aOutfile, int aFormat )
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{
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potrace_param_t* param;
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potrace_state_t* st;
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// set tracing parameters, starting from defaults
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param = potrace_param_default();
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if( !param )
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{
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fprintf( stderr, "Error allocating parameters: %s\n", strerror( errno ) );
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return 1;
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}
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param->turdsize = 0;
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/* convert the bitmap to curves */
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st = potrace_trace( param, aPotrace_bitmap );
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if( !st || st->status != POTRACE_STATUS_OK )
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{
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fprintf( stderr, "Error tracing bitmap: %s\n", strerror( errno ) );
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return 1;
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}
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BITMAPCONV_INFO info;
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info.m_PixmapWidth = aPotrace_bitmap->w;
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info.m_PixmapHeight = aPotrace_bitmap->h; // the bitmap size in pixels
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info.m_Paths = st->plist;
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info.m_Outfile = aOutfile;
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switch( aFormat )
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{
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case 2:
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info.m_Format = POSTSCRIPT_FMT;
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info.m_ScaleX = info.m_ScaleY = 1.0; // the conversion scale
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// output vector data, e.g. as a rudimentary EPS file (mainly for tests)
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info.CreateOutputFile();
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break;
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case 1:
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info.m_Format = EESCHEMA_FMT;
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info.m_ScaleX = 1000.0 / 300; // the conversion scale
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info.m_ScaleY = -info.m_ScaleX; // Y axis is bottom to Top for components in libs
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info.CreateOutputFile();
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break;
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case 0:
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info.m_Format = PCBNEW_FMT;
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info.m_ScaleX = 10000.0 / 300; // the conversion scale
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info.m_ScaleY = info.m_ScaleX; // Y axis is top to bottom in modedit
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info.CreateOutputFile();
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break;
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default:
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break;
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}
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bm_free( aPotrace_bitmap );
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potrace_state_free( st );
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potrace_param_free( param );
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return 0;
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}
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void BITMAPCONV_INFO::OuputFileHeader()
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{
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int Ypos = (int) ( m_PixmapHeight / 2 * m_ScaleY );
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int fieldSize; // fields text size = 60 mils
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switch( m_Format )
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{
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case POSTSCRIPT_FMT:
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/* output vector data, e.g. as a rudimentary EPS file */
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fprintf( m_Outfile, "%%!PS-Adobe-3.0 EPSF-3.0\n" );
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fprintf( m_Outfile, "%%%%BoundingBox: 0 0 %d %d\n",
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m_PixmapWidth, m_PixmapHeight );
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fprintf( m_Outfile, "gsave\n" );
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break;
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case PCBNEW_FMT:
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#define FIELD_LAYER 21
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fieldSize = 600; // fields text size = 60 mils
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Ypos += fieldSize / 2;
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fprintf( m_Outfile, "PCBNEW-LibModule-V1\n" );
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fprintf( m_Outfile, "$INDEX\n%s\n$EndINDEX\n", m_CmpName );
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fprintf( m_Outfile, "#\n# %s\n", m_CmpName );
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fprintf( m_Outfile, "# pixmap w = %d, h = %d\n#\n",
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m_PixmapWidth, m_PixmapHeight );
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fprintf( m_Outfile, "$MODULE %s\n", m_CmpName );
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fprintf( m_Outfile, "Po 0 0 0 15 00000000 00000000 ~~\n" );
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fprintf( m_Outfile, "Li %s\n", m_CmpName );
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fprintf( m_Outfile, "T0 0 %d %d %d 0 %d N I %d \"G***\"\n",
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Ypos, fieldSize, fieldSize, fieldSize / 5, FIELD_LAYER );
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fprintf( m_Outfile, "T1 0 %d %d %d 0 %d N I %d \"%s\"\n",
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-Ypos, fieldSize, fieldSize, fieldSize / 5, FIELD_LAYER, m_CmpName );
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break;
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case EESCHEMA_FMT:
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fprintf( m_Outfile, "EESchema-LIBRARY Version 2.3\n" );
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fprintf( m_Outfile, "#\n# %s\n", m_CmpName );
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fprintf( m_Outfile, "# pixmap size w = %d, h = %d\n#\n",
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m_PixmapWidth, m_PixmapHeight );
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// print reference and value
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fieldSize = 60; // fields text size = 60 mils
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Ypos += fieldSize / 2;
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fprintf( m_Outfile, "DEF %s G 0 40 Y Y 1 F N\n", m_CmpName );
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fprintf( m_Outfile, "F0 \"#G\" 0 %d %d H I C CNN\n", Ypos, fieldSize );
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fprintf( m_Outfile, "F1 \"%s\" 0 %d %d H I C CNN\n", m_CmpName, -Ypos, fieldSize );
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fprintf( m_Outfile, "DRAW\n" );
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break;
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}
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}
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void BITMAPCONV_INFO::OuputFileEnd()
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{
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switch( m_Format )
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{
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case POSTSCRIPT_FMT:
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fprintf( m_Outfile, "grestore\n" );
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fprintf( m_Outfile, "%%EOF\n" );
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break;
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case PCBNEW_FMT:
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fprintf( m_Outfile, "$EndMODULE %s\n", m_CmpName );
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fprintf( m_Outfile, "$EndLIBRARY\n" );
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break;
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case EESCHEMA_FMT:
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fprintf( m_Outfile, "ENDDRAW\n" );
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fprintf( m_Outfile, "ENDDEF\n" );
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break;
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}
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}
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/**
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* Function OuputOnePolygon
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* write one polygon to output file.
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* Polygon coordinates are expected scaled by the polugon extraction function
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*/
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void BITMAPCONV_INFO::OuputOnePolygon( KPolygon & aPolygon )
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{
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unsigned ii;
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KPolyPoint currpoint;
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int offsetX = (int)( m_PixmapWidth / 2 * m_ScaleX );
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int offsetY = (int)( m_PixmapHeight / 2 * m_ScaleY );
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KPolyPoint startpoint = *aPolygon.begin();
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switch( m_Format )
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{
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case POSTSCRIPT_FMT:
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fprintf( m_Outfile, "%d %d moveto\n",
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startpoint.x(), startpoint.y() );
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for( ii = 1; ii < aPolygon.size(); ii++ )
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{
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currpoint = *(aPolygon.begin() + ii);
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fprintf( m_Outfile, "%d %d lineto\n",
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currpoint.x(), currpoint.y() );
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}
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fprintf( m_Outfile, "0 setgray fill\n" );
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break;
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case PCBNEW_FMT:
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{
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#define SILKSCREEN_N_FRONT 21
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int layer = SILKSCREEN_N_FRONT;
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int width = 1;
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fprintf( m_Outfile, "DP %d %d %d %d %d %d %d\n",
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0, 0, 0, 0,
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(int) aPolygon.size() + 1, width, layer );
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for( ii = 0; ii < aPolygon.size(); ii++ )
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{
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currpoint = *( aPolygon.begin() + ii );
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fprintf( m_Outfile, "Dl %d %d\n",
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currpoint.x() - offsetX, currpoint.y() - offsetY );
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}
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// Close polygon
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fprintf( m_Outfile, "Dl %d %d\n",
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startpoint.x() - offsetX, startpoint.y() - offsetY );
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}
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break;
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case EESCHEMA_FMT:
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fprintf( m_Outfile, "P %d 0 0 1", (int) aPolygon.size() + 1 );
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for( ii = 0; ii < aPolygon.size(); ii++ )
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{
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currpoint = *(aPolygon.begin() + ii);
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fprintf( m_Outfile, " %d %d",
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currpoint.x() - offsetX, currpoint.y() - offsetY );
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}
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// Close polygon
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fprintf( m_Outfile, " %d %d",
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startpoint.x() - offsetX, startpoint.y() - offsetY );
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fprintf( m_Outfile, " F\n" );
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break;
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}
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}
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void BITMAPCONV_INFO::CreateOutputFile()
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{
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KPolyPoint currpoint;
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std::vector <potrace_dpoint_t> cornersBuffer;
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// This KPolygonSet polyset_areas is a complex polygon to draw
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// and can be complex depending on holes inside this polygon
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KPolygonSet polyset_areas;
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// This KPolygonSet polyset_holes is the set of holes inside polyset_areas
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KPolygonSet polyset_holes;
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potrace_dpoint_t( *c )[3];
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OuputFileHeader();
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bool main_outline = true;
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/* draw each as a polygon with no hole.
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* Bezier curves are approximated by a polyline
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*/
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potrace_path_t* paths = m_Paths; // the list of paths
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while( paths != NULL )
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{
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int cnt = paths->curve.n;
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int* tag = paths->curve.tag;
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c = paths->curve.c;
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potrace_dpoint_t startpoint = c[cnt - 1][2];
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for( int i = 0; i < cnt; i++ )
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{
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switch( tag[i] )
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{
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case POTRACE_CORNER:
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cornersBuffer.push_back( c[i][1] );
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cornersBuffer.push_back( c[i][2] );
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startpoint = c[i][2];
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break;
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case POTRACE_CURVETO:
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BezierToPolyline( cornersBuffer, startpoint, c[i][0], c[i][1], c[i][2] );
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startpoint = c[i][2];
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break;
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}
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}
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// Store current path
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if( main_outline )
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{
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main_outline = false;
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// build the current main polygon
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std::vector<KPolyPoint> cornerslist; // a simple boost polygon
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for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
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{
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currpoint.x( (coordinate_type) (cornersBuffer[i].x * m_ScaleX) );
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currpoint.y( (coordinate_type) (cornersBuffer[i].y * m_ScaleY) );
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cornerslist.push_back( currpoint );
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}
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KPolygon poly;
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bpl::set_points( poly, cornerslist.begin(), cornerslist.end() );
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polyset_areas.push_back( poly );
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}
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else
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{
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// Add current hole in polyset_holes
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std::vector<KPolyPoint> cornerslist; // a simple boost polygon
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for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
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{
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currpoint.x( (coordinate_type) (cornersBuffer[i].x * m_ScaleX) );
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currpoint.y( (coordinate_type) (cornersBuffer[i].y * m_ScaleY) );
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cornerslist.push_back( currpoint );
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}
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KPolygon poly;
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bpl::set_points( poly, cornerslist.begin(), cornerslist.end() );
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polyset_holes.push_back( poly );
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}
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cornersBuffer.clear();
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/* at the end of a group of a positive path and its negative children, fill.
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*/
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if( paths->next == NULL || paths->next->sign == '+' )
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{
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// Substract holes to main polygon:
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polyset_areas -= polyset_holes;
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// Output current resulting polygon(s)
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for( unsigned ii = 0; ii < polyset_areas.size(); ii++ )
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{
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KPolygon& poly = polyset_areas[ii];
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OuputOnePolygon(poly );
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}
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polyset_areas.clear();
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polyset_holes.clear();
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main_outline = true;
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}
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paths = paths->next;
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}
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OuputFileEnd();
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}
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/* render a Bezier curve. */
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void BezierToPolyline( std::vector <potrace_dpoint_t>& aCornersBuffer,
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potrace_dpoint_t p1,
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potrace_dpoint_t p2,
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potrace_dpoint_t p3,
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potrace_dpoint_t p4 )
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{
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double dd0, dd1, dd, delta, e2, epsilon, t;
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// p1 = starting point
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/* we approximate the curve by small line segments. The interval
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* size, epsilon, is determined on the fly so that the distance
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* between the true curve and its approximation does not exceed the
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* desired accuracy delta. */
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delta = 0.25; /* desired accuracy, in pixels */
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/* let dd = maximal value of 2nd derivative over curve - this must
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* occur at an endpoint. */
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dd0 = sq( p1.x - 2 * p2.x + p3.x ) + sq( p1.y - 2 * p2.y + p3.y );
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dd1 = sq( p2.x - 2 * p3.x + p4.x ) + sq( p2.y - 2 * p3.y + p4.y );
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dd = 6 * sqrt( max( dd0, dd1 ) );
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e2 = 8 * delta <= dd ? 8 * delta / dd : 1;
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epsilon = sqrt( e2 ); /* necessary interval size */
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for( t = epsilon; t<1; t += epsilon )
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{
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potrace_dpoint_t intermediate_point;
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intermediate_point.x = p1.x * cu( 1 - t ) +
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3* p2.x* sq( 1 - t ) * t +
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3 * p3.x * (1 - t) * sq( t ) +
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p4.x* cu( t );
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intermediate_point.y = p1.y * cu( 1 - t ) +
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3* p2.y* sq( 1 - t ) * t +
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3 * p3.y * (1 - t) * sq( t ) + p4.y* cu( t );
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aCornersBuffer.push_back( intermediate_point );
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}
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aCornersBuffer.push_back( p4 );
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}
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