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kicad/common/plotters/SVG_plotter.cpp

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/**
* @file SVG_plotter.cpp
* @brief Kicad: specialized plotter for SVG files format
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2017 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 1992-2017 KiCad Developers, see AUTHORS.txt for contributors.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* Some info on basic items SVG format, used here:
* The root element of all SVG files is the <svg> element.
*
* The <g> element is used to group SVG shapes together.
* Once grouped you can transform the whole group of shapes as if it was a single shape.
* This is an advantage compared to a nested <svg> element
* which cannot be the target of transformation by itself.
*
* The <rect> element represents a rectangle.
* Using this element you can draw rectangles of various width, height,
* with different stroke (outline) and fill colors, with sharp or rounded corners etc.
*
* <svg xmlns="http://www.w3.org/2000/svg"
* xmlns:xlink="http://www.w3.org/1999/xlink">
*
* <rect x="10" y="10" height="100" width="100"
* style="stroke:#006600; fill: #00cc00"/>
*
* </svg>
*
* The <circle> element is used to draw circles.
* <circle cx="40" cy="40" r="24" style="stroke:#006600; fill:#00cc00"/>
*
* The <ellipse> element is used to draw ellipses.
* An ellipse is a circle that does not have equal height and width.
* Its radius in the x and y directions are different, in other words.
* <ellipse cx="40" cy="40" rx="30" ry="15"
* style="stroke:#006600; fill:#00cc00"/>
*
* The <line> element is used to draw lines.
*
* <line x1="0" y1="10" x2="0" y2="100" style="stroke:#006600;"/>
* <line x1="10" y1="10" x2="100" y2="100" style="stroke:#006600;"/>
*
* The <polyline> element is used to draw multiple connected lines
* Here is a simple example:
*
* <polyline points="0,0 30,0 15,30" style="stroke:#006600;"/>
*
* The <polygon> element is used to draw with multiple (3 or more) sides / edges.
* Here is a simple example:
*
* <polygon points="0,0 50,0 25,50" style="stroke:#660000; fill:#cc3333;"/>
*
* The <path> element is used to draw advanced shapes combined from lines and arcs,
* with or without fill.
* It is probably the most advanced and versatile SVG shape of them all.
* It is probably also the hardest element to master.
* <path d="M50,50
* A30,30 0 0,1 35,20
* L100,100
* M110,110
* L100,0"
* style="stroke:#660000; fill:none;"/>
*
* Draw an elliptic arc: it is one of basic path command:
* <path d="M(startx,starty) A(radiusx,radiusy)
* rotation-axe-x
* flag_arc_large,flag_sweep endx,endy">
* flag_arc_large: 0 = small arc > 180 deg, 1 = large arc > 180 deg
* flag_sweep : 0 = CCW, 1 = CW
* The center of ellipse is automatically calculated.
*/
#include <fctsys.h>
#include <trigo.h>
#include <wxstruct.h>
#include <class_eda_rect.h>
#include <base_struct.h>
#include <common.h>
#include <plotter.h>
#include <macros.h>
#include <kicad_string.h>
/**
* Function XmlEsc
* translates '<' to "&lt;", '>' to "&gt;" and so on, according to the spec:
* http://www.w3.org/TR/2000/WD-xml-c14n-20000119.html#charescaping
* May be moved to a library if needed generally, but not expecting that.
*/
static wxString XmlEsc( const wxString& aStr, bool isAttribute = false )
{
wxString escaped;
escaped.reserve( aStr.length() );
for( wxString::const_iterator it = aStr.begin(); it != aStr.end(); ++it )
{
const wxChar c = *it;
switch( c )
{
case wxS( '<' ):
escaped.append( wxS( "&lt;" ) );
break;
case wxS( '>' ):
escaped.append( wxS( "&gt;" ) );
break;
case wxS( '&' ):
escaped.append( wxS( "&amp;" ) );
break;
case wxS( '\r' ):
escaped.append( wxS( "&#xD;" ) );
break;
default:
if( isAttribute )
{
switch( c )
{
case wxS( '"' ):
escaped.append( wxS( "&quot;" ) );
break;
case wxS( '\t' ):
escaped.append( wxS( "&#x9;" ) );
break;
case wxS( '\n' ):
escaped.append( wxS( "&#xA;" ));
break;
default:
escaped.append(c);
}
}
else
escaped.append(c);
}
}
return escaped;
}
SVG_PLOTTER::SVG_PLOTTER()
{
m_graphics_changed = true;
SetTextMode( PLOTTEXTMODE_STROKE );
m_fillMode = NO_FILL; // or FILLED_SHAPE or FILLED_WITH_BG_BODYCOLOR
m_pen_rgb_color = 0; // current color value (black)
m_brush_rgb_color = 0; // current color value (black)
m_dashed = false;
}
void SVG_PLOTTER::SetViewport( const wxPoint& aOffset, double aIusPerDecimil,
double aScale, bool aMirror )
{
m_plotMirror = aMirror;
m_yaxisReversed = true; // unlike other plotters, SVG has Y axis reversed
plotOffset = aOffset;
plotScale = aScale;
m_IUsPerDecimil = aIusPerDecimil;
iuPerDeviceUnit = 1.0 / aIusPerDecimil;
/* Compute the paper size in IUs */
paperSize = pageInfo.GetSizeMils();
paperSize.x *= 10.0 * aIusPerDecimil;
paperSize.y *= 10.0 * aIusPerDecimil;
SetDefaultLineWidth( 100 * aIusPerDecimil ); // arbitrary default
}
void SVG_PLOTTER::SetColor( COLOR4D color )
{
PSLIKE_PLOTTER::SetColor( color );
if( m_graphics_changed )
setSVGPlotStyle();
}
void SVG_PLOTTER::setFillMode( FILL_T fill )
{
if( m_fillMode != fill )
{
m_graphics_changed = true;
m_fillMode = fill;
}
}
void SVG_PLOTTER::setSVGPlotStyle()
{
fputs( "</g>\n<g style=\"", outputFile );
fputs( "fill:#", outputFile );
// output the background fill color
fprintf( outputFile, "%6.6lX; ", m_brush_rgb_color );
switch( m_fillMode )
{
case NO_FILL:
fputs( "fill-opacity:0.0; ", outputFile );
break;
case FILLED_SHAPE:
fputs( "fill-opacity:1.0; ", outputFile );
break;
case FILLED_WITH_BG_BODYCOLOR:
fputs( "fill-opacity:0.6; ", outputFile );
break;
}
double pen_w = userToDeviceSize( GetCurrentLineWidth() );
fprintf( outputFile, "\nstroke:#%6.6lX; stroke-width:%g; stroke-opacity:1; \n",
m_pen_rgb_color, pen_w );
fputs( "stroke-linecap:round; stroke-linejoin:round;", outputFile );
switch( m_dashed )
{
case PLOTDASHTYPE_DASH:
fprintf( outputFile, "stroke-dasharray:%g,%g;",
GetDashMarkLenIU(), GetDashGapLenIU() );
break;
case PLOTDASHTYPE_DOT:
fprintf( outputFile, "stroke-dasharray:%g,%g;",
GetDotMarkLenIU(), GetDashGapLenIU() );
break;
case PLOTDASHTYPE_DASHDOT:
fprintf( outputFile, "stroke-dasharray:%g,%g,%g,%g;",
GetDashMarkLenIU(), GetDashGapLenIU(), GetDotMarkLenIU(), GetDashGapLenIU() );
break;
}
fputs( "\">\n", outputFile );
m_graphics_changed = false;
}
/* Set the current line width (in IUs) for the next plot
*/
void SVG_PLOTTER::SetCurrentLineWidth( int width, void* aData )
{
int pen_width;
if( width >= 0 )
pen_width = width;
else
pen_width = defaultPenWidth;
if( pen_width != currentPenWidth )
{
m_graphics_changed = true;
currentPenWidth = pen_width;
}
if( m_graphics_changed )
setSVGPlotStyle();
}
/* initialize m_red, m_green, m_blue ( 0 ... 255)
* from reduced values r, g ,b ( 0.0 to 1.0 )
*/
void SVG_PLOTTER::emitSetRGBColor( double r, double g, double b )
{
int red = (int) ( 255.0 * r );
int green = (int) ( 255.0 * g );
int blue = (int) ( 255.0 * b );
long rgb_color = (red << 16) | (green << 8) | blue;
if( m_pen_rgb_color != rgb_color )
{
m_graphics_changed = true;
m_pen_rgb_color = rgb_color;
// Currently, use the same color for brush and pen
// (i.e. to draw and fill a contour)
m_brush_rgb_color = rgb_color;
}
}
/**
* SVG supports dashed lines
*/
void SVG_PLOTTER::SetDash( int dashed )
{
if( m_dashed != dashed )
{
m_graphics_changed = true;
m_dashed = dashed;
}
if( m_graphics_changed )
setSVGPlotStyle();
}
void SVG_PLOTTER::Rect( const wxPoint& p1, const wxPoint& p2, FILL_T fill, int width )
{
EDA_RECT rect( p1, wxSize( p2.x -p1.x, p2.y -p1.y ) );
rect.Normalize();
DPOINT org_dev = userToDeviceCoordinates( rect.GetOrigin() );
DPOINT end_dev = userToDeviceCoordinates( rect.GetEnd() );
DSIZE size_dev = end_dev - org_dev;
// Ensure size of rect in device coordinates is > 0
// I don't know if this is a SVG issue or a Inkscape issue, but
// Inkscape has problems with negative or null values for width and/or height, so avoid them
DBOX rect_dev( org_dev, size_dev);
rect_dev.Normalize();
setFillMode( fill );
SetCurrentLineWidth( width );
// Rectangles having a 0 size value for height or width are just not drawn on Inscape,
// so use a line when happens.
if( rect_dev.GetSize().x == 0.0 || rect_dev.GetSize().y == 0.0 ) // Draw a line
fprintf( outputFile,
"<line x1=\"%g\" y1=\"%g\" x2=\"%g\" y2=\"%g\" />\n",
rect_dev.GetPosition().x, rect_dev.GetPosition().y,
rect_dev.GetEnd().x, rect_dev.GetEnd().y
);
else
fprintf( outputFile,
"<rect x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" rx=\"%g\" />\n",
rect_dev.GetPosition().x, rect_dev.GetPosition().y,
rect_dev.GetSize().x, rect_dev.GetSize().y,
0.0 // radius of rounded corners
);
}
void SVG_PLOTTER::Circle( const wxPoint& pos, int diametre, FILL_T fill, int width )
{
DPOINT pos_dev = userToDeviceCoordinates( pos );
double radius = userToDeviceSize( diametre / 2.0 );
setFillMode( fill );
SetCurrentLineWidth( width );
fprintf( outputFile,
"<circle cx=\"%g\" cy=\"%g\" r=\"%g\" /> \n",
pos_dev.x, pos_dev.y, radius );
}
void SVG_PLOTTER::Arc( const wxPoint& centre, double StAngle, double EndAngle, int radius,
FILL_T fill, int width )
{
/* Draws an arc of a circle, centred on (xc,yc), with starting point
* (x1, y1) and ending at (x2, y2). The current pen is used for the outline
* and the current brush for filling the shape.
*
* The arc is drawn in an anticlockwise direction from the start point to
* the end point
*/
if( radius <= 0 )
return;
if( StAngle > EndAngle )
std::swap( StAngle, EndAngle );
setFillMode( fill );
SetCurrentLineWidth( width );
// Calculate start point.
DPOINT centre_dev = userToDeviceCoordinates( centre );
double radius_dev = userToDeviceSize( radius );
if( !m_yaxisReversed ) // Should be never the case
{
double tmp = StAngle;
StAngle = -EndAngle;
EndAngle = -tmp;
}
if( m_plotMirror )
{
if( m_mirrorIsHorizontal )
{
StAngle = 1800.0 -StAngle;
EndAngle = 1800.0 -EndAngle;
std::swap( StAngle, EndAngle );
}
else
{
StAngle = -StAngle;
EndAngle = -EndAngle;
}
}
DPOINT start;
start.x = radius_dev;
RotatePoint( &start.x, &start.y, StAngle );
DPOINT end;
end.x = radius_dev;
RotatePoint( &end.x, &end.y, EndAngle );
start += centre_dev;
end += centre_dev;
double theta1 = DECIDEG2RAD( StAngle );
if( theta1 < 0 )
theta1 = theta1 + M_PI * 2;
double theta2 = DECIDEG2RAD( EndAngle );
if( theta2 < 0 )
theta2 = theta2 + M_PI * 2;
if( theta2 < theta1 )
theta2 = theta2 + M_PI * 2;
int flg_arc = 0; // flag for large or small arc. 0 means less than 180 degrees
if( fabs( theta2 - theta1 ) > M_PI )
flg_arc = 1;
int flg_sweep = 0; // flag for sweep always 0
// Draw a single arc: an arc is one of 3 curve commands (2 other are 2 bezier curves)
// params are start point, radius1, radius2, X axe rotation,
// flag arc size (0 = small arc > 180 deg, 1 = large arc > 180 deg),
// sweep arc ( 0 = CCW, 1 = CW),
// end point
fprintf( outputFile, "<path d=\"M%g %g A%g %g 0.0 %d %d %g %g \" />\n",
start.x, start.y, radius_dev, radius_dev,
flg_arc, flg_sweep,
end.x, end.y );
}
void SVG_PLOTTER::PlotPoly( const std::vector<wxPoint>& aCornerList,
FILL_T aFill, int aWidth, void * aData )
{
if( aCornerList.size() <= 1 )
return;
setFillMode( aFill );
SetCurrentLineWidth( aWidth );
switch( aFill )
{
case NO_FILL:
fprintf( outputFile, "<polyline fill=\"none;\"\n" );
break;
case FILLED_WITH_BG_BODYCOLOR:
case FILLED_SHAPE:
fprintf( outputFile, "<polyline style=\"fill-rule:evenodd;\"\n" );
break;
}
DPOINT pos = userToDeviceCoordinates( aCornerList[0] );
fprintf( outputFile, "points=\"%d,%d\n", (int) pos.x, (int) pos.y );
for( unsigned ii = 1; ii < aCornerList.size(); ii++ )
{
pos = userToDeviceCoordinates( aCornerList[ii] );
fprintf( outputFile, "%d,%d\n", (int) pos.x, (int) pos.y );
}
// ensure the shape is closed, for filled shapes (that are closed polygons):
// (svg does not close automatically a polygon
if( aCornerList.front() != aCornerList.back() && aFill != NO_FILL )
{
pos = userToDeviceCoordinates( aCornerList.front() );
fprintf( outputFile, "%d,%d\n", (int) pos.x, (int) pos.y );
}
// Close/(fill) the path
fprintf( outputFile, "\" /> \n" );
}
/**
* Postscript-likes at the moment are the only plot engines supporting bitmaps...
*/
void SVG_PLOTTER::PlotImage( const wxImage& aImage, const wxPoint& aPos,
double aScaleFactor )
{
// in svg file we must insert a link to a png image file to plot an image
// the image itself is not included in the svg file.
// So we prefer skip the image, and just draw a rectangle,
// like other plotters which do not support images
PLOTTER::PlotImage( aImage, aPos, aScaleFactor );
}
void SVG_PLOTTER::PenTo( const wxPoint& pos, char plume )
{
if( plume == 'Z' )
{
if( penState != 'Z' )
{
fputs( "\" />\n", outputFile );
penState = 'Z';
penLastpos.x = -1;
penLastpos.y = -1;
}
return;
}
if( penState == 'Z' ) // here plume = 'D' or 'U'
{
DPOINT pos_dev = userToDeviceCoordinates( pos );
// Ensure we do not use a fill mode when moving tne pen,
// in SVG mode (i;e. we are plotting only basic lines, not a filled area
if( m_fillMode != NO_FILL )
{
setFillMode( NO_FILL );
setSVGPlotStyle();
}
fprintf( outputFile, "<path d=\"M%d %d\n",
(int) pos_dev.x, (int) pos_dev.y );
}
else if( penState != plume || pos != penLastpos )
{
DPOINT pos_dev = userToDeviceCoordinates( pos );
fprintf( outputFile, "L%d %d\n",
(int) pos_dev.x, (int) pos_dev.y );
}
penState = plume;
penLastpos = pos;
}
/**
* The code within this function
* creates SVG files header
*/
bool SVG_PLOTTER::StartPlot()
{
wxASSERT( outputFile );
wxString msg;
static const char* header[] =
{
"<?xml version=\"1.0\" standalone=\"no\"?>\n",
" <!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \n",
" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"> \n",
"<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" \n",
NULL
};
// Write header.
for( int ii = 0; header[ii] != NULL; ii++ )
{
fputs( header[ii], outputFile );
}
// Write viewport pos and size
wxPoint origin; // TODO set to actual value
fprintf( outputFile,
" width=\"%gcm\" height=\"%gcm\" viewBox=\"%d %d %d %d \">\n",
(double) paperSize.x / m_IUsPerDecimil * 2.54 / 10000,
(double) paperSize.y / m_IUsPerDecimil * 2.54 / 10000,
origin.x, origin.y,
(int) ( paperSize.x / m_IUsPerDecimil ),
(int) ( paperSize.y / m_IUsPerDecimil) );
// Write title
char date_buf[250];
time_t ltime = time( NULL );
strftime( date_buf, 250, "%Y/%m/%d %H:%M:%S",
localtime( &ltime ) );
fprintf( outputFile,
"<title>SVG Picture created as %s date %s </title>\n",
TO_UTF8( XmlEsc( wxFileName( filename ).GetFullName() ) ), date_buf );
// End of header
fprintf( outputFile, " <desc>Picture generated by %s </desc>\n",
TO_UTF8( XmlEsc( creator ) ) );
// output the pen and brush color (RVB values in hex) and opacity
double opacity = 1.0; // 0.0 (transparent to 1.0 (solid)
fprintf( outputFile,
"<g style=\"fill:#%6.6lX; fill-opacity:%g;stroke:#%6.6lX; stroke-opacity:%g;\n",
m_brush_rgb_color, opacity, m_pen_rgb_color, opacity );
// output the pen cap and line joint
fputs( "stroke-linecap:round; stroke-linejoin:round; \"\n", outputFile );
fputs( " transform=\"translate(0 0) scale(1 1)\">\n", outputFile );
return true;
}
bool SVG_PLOTTER::EndPlot()
{
fputs( "</g> \n</svg>\n", outputFile );
fclose( outputFile );
outputFile = NULL;
return true;
}
void SVG_PLOTTER::Text( const wxPoint& aPos,
const COLOR4D aColor,
const wxString& aText,
double aOrient,
const wxSize& aSize,
enum EDA_TEXT_HJUSTIFY_T aH_justify,
enum EDA_TEXT_VJUSTIFY_T aV_justify,
int aWidth,
bool aItalic,
bool aBold,
bool aMultilineAllowed,
void* aData )
{
setFillMode( NO_FILL );
SetColor( aColor );
SetCurrentLineWidth( aWidth );
// TODO: see if the postscript native text code can be used in SVG plotter
PLOTTER::Text( aPos, aColor, aText, aOrient, aSize, aH_justify, aV_justify,
aWidth, aItalic, aBold, aMultilineAllowed );
}
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