class PLOTTER: dash lines parameters in one place for plot. I made minor changes (values in mm and set to give the same size as dashed lines drawn by wxDC, using short dash.)

common/class_plotter.cpp

@@ -63,7 +63,8 @@ PLOTTER::PLOTTER( )
     // Temporary init to avoid not initialized vars, will be set later
     m_IUsPerDecimil = 1;        // will be set later to the actual value
     iuPerDeviceUnit = 1;        // will be set later to the actual value
-
+    m_dashMarkLength_mm = 0.5;  // Dashed line parameter in mm: segment
+    m_dashGapLength_mm = 0.25;   // Dashed line parameter in mm: gap
 }
 
 PLOTTER::~PLOTTER()
@@ -71,9 +72,7 @@ PLOTTER::~PLOTTER()
     // Emergency cleanup, but closing the file is
     // usually made in EndPlot().
     if( outputFile )
-    {
         fclose( outputFile );
-    }
 }
 
 
@@ -126,12 +125,24 @@ DPOINT PLOTTER::userToDeviceSize( const wxSize& size )
 }
 
 
-double PLOTTER::userToDeviceSize( double size )
+double PLOTTER::userToDeviceSize( double size ) const
 {
     return size * plotScale * iuPerDeviceUnit;
 }
 
 
+double PLOTTER::GetDashMarkLenIU() const
+{
+    double mark = userToDeviceSize( m_dashMarkLength_mm*10000/25.4*m_IUsPerDecimil - GetCurrentLineWidth() );
+    return ( mark < 0.0 ) ? 0.0 : mark;
+}
+
+
+double PLOTTER::GetDashGapLenIU() const
+{
+    return userToDeviceSize( m_dashGapLength_mm*10000/25.4*m_IUsPerDecimil + GetCurrentLineWidth() );
+}
+
 void PLOTTER::Arc( const wxPoint& centre, double StAngle, double EndAngle, int radius,
                    FILL_T fill, int width )
 {

common/common_plotPDF_functions.cpp

@@ -132,7 +132,8 @@ void PDF_PLOTTER::SetDash( bool dashed )
 {
     wxASSERT( workFile );
     if( dashed )
-        fputs( "[200] 100 d\n", workFile );
+        fprintf( workFile, "[%d %d] 0 d\n",
+                 (int) GetDashMarkLenIU(), (int) GetDashGapLenIU() );
     else
         fputs( "[] 0 d\n", workFile );
 }

common/common_plotPS_functions.cpp

@@ -228,7 +228,7 @@ void PSLIKE_PLOTTER::FlashPadTrapez( const wxPoint& aPadPos, const wxPoint *aCor
 
 
 /**
- * Write on a stream a string escaped for postscript/PDF
+ * Write on a stream a string escaped for postscript/PDF
  */
 void PSLIKE_PLOTTER::fputsPostscriptString(FILE *fout, const wxString& txt)
 {
@@ -469,7 +469,8 @@ void PS_PLOTTER::SetDash( bool dashed )
 {
     wxASSERT( outputFile );
     if( dashed )
-        fputs( "dashedline\n", outputFile );
+        fprintf( outputFile, "[%d %d] 0 setdash\n",
+                 (int) GetDashMarkLenIU(), (int) GetDashGapLenIU() );
     else
         fputs( "solidline\n", outputFile );
 }

common/common_plotSVG_functions.cpp

@@ -231,14 +231,8 @@ void SVG_PLOTTER::setSVGPlotStyle()
     fputs( "stroke-linecap:round; stroke-linejoin:round;", outputFile );
 
     if( m_dashed )
-    {
-        // Use a simple dash shape: a segment + a space
-        #define DASH_SIZE 0.3     // length in mm of a dash
-        double segm_len = DASH_SIZE * 10000/2.54 * m_IUsPerDecimil;
-        // Use a space to the same len as segment, between segments
-        double space_len = segm_len + pen_w;
-        fprintf( outputFile, "stroke-dasharray:%g,%g;", segm_len, space_len );
-    }
+        fprintf( outputFile, "stroke-dasharray:%g,%g;",
+                 GetDashMarkLenIU(), GetDashGapLenIU() );
 
     fputs( "\">\n", outputFile );
 

include/plot_common.h

@@ -82,6 +82,10 @@ enum PlotTextMode {
  */
 class PLOTTER
 {
+private:
+    double m_dashMarkLength_mm ;     ///< Dashed line parameter in mm: segment
+    double m_dashGapLength_mm;       ///< Dashed line parameter in mm: gap
+
 public:
     static const int DEFAULT_LINE_WIDTH = -1;
 
@@ -396,7 +400,11 @@ protected:
      * Modifies size according to the plotter scale factors
      * (simple double version)
      */
-    virtual double userToDeviceSize( double size );
+    virtual double userToDeviceSize( double size ) const;
+
+    double GetDashMarkLenIU() const;
+
+    double GetDashGapLenIU() const;
 
     /// Plot scale - chosen by the user (even implicitly with 'fit in a4')
     double        plotScale;