Fixed some issues with arcs (Arcs are a nightmare in graphic applications).

gerbview/class_GERBER.cpp

@@ -57,7 +57,7 @@
 GERBER::GERBER( WinEDA_GerberFrame* aParent, int aLayer )
 {
     m_Parent = aParent;
-    m_Layer  = aLayer;           // Layer Number
+    m_GraphicLayer  = aLayer;           // Graphic layer Number
 
     m_Selected_Tool = FIRST_DCODE;
 
@@ -157,6 +157,7 @@ void GERBER::ResetDefaultValues()
     m_FilesPtr        = 0;
     m_PolygonFillMode = false;
     m_PolygonFillModeState = 0;
+    m_Selected_Tool = FIRST_DCODE;
 }
 
 

gerbview/class_GERBER.h

@@ -33,7 +33,7 @@ public:
     wxString           m_FileName;                                      // Full File Name for this layer
     wxString           m_ImageName;                                     // Image name, from IN <name>* command
     wxString           m_LayerName;                                     // Layer name, from LN <name>* command
-    int                m_Layer;                                         // Layer Number
+    int                m_GraphicLayer;                                  // Graphic layer Number
     bool               m_LayerNegative;                                 // true = Negative Layer
     bool               m_GerbMetric;                                    // false = Inches, true = metric
     bool               m_Relative;                                      // false = absolute Coord, true = relative Coord

gerbview/class_gerber_draw_item.cpp

@@ -352,6 +352,12 @@ void GERBER_DRAW_ITEM::Draw( WinEDA_DrawPanel* aPanel, wxDC* aDC, int aDrawMode,
         break;
 
     case GBR_ARC:
+#if 0     // for arc debug only
+        GRLine( &aPanel->m_ClipBox, aDC, GetABPosition( m_Start ),
+                    GetABPosition( m_ArcCentre ), 0, color );
+        GRLine( &aPanel->m_ClipBox, aDC, GetABPosition( m_End ),
+                    GetABPosition( m_ArcCentre ), 0, color );
+#endif
         if( !isFilled )
         {
             GRArc1( &aPanel->m_ClipBox, aDC, GetABPosition( m_Start ),

gerbview/gerber_test_files/test-polygon_with_arc-fill.gbr

+G04 Draw a rectangle with a rounded right side
+G04 Hand coded by Julian Lamb *
+%MOIN*%
+%FSLAX23Y23*%
+%ADD10C,0.050*%
+
+G04 Draw a rectangle with a rounded right side*
+G36*
+G01X0Y0D02*
+X00200Y0D01*
+G75*
+G03X00200Y00200I0J00100D01*
+G01X0Y00200D01*
+G04 Do not close with a final line, so let gerbv automatically close*
+G37*
+
+
+M02*

gerbview/rs274d.cpp

@@ -3,12 +3,15 @@
 /********************/
 
 #include "fctsys.h"
+
 //#include "polygons_defs.h"
 #include "common.h"
+
 //#include "confirm.h"
 //#include "macros.h"
 #include "gerbview.h"
 #include "trigo.h"
+#include "macros.h"
 #include "class_gerber_draw_item.h"
 #include "class_GERBER.h"
 
@@ -20,8 +23,8 @@
 /* Gerber: NOTES about some important commands found in RS274D and RS274X (G codes):
  * Gn =
  * G01 linear interpolation (right trace)
- * G02, G20, G21 Circular interpolation, meaning trig <0
- * G03, G30, G31 Circular interpolation, meaning trigo> 0
+ * G02, G20, G21 Circular interpolation, meaning trig <0 (clockwise)
+ * G03, G30, G31 Circular interpolation, meaning trigo> 0 (counterclockwise)
  * G04 = comment
  * G06 parabolic interpolation
  * G07 Cubic Interpolation
@@ -224,8 +227,8 @@ static void fillLineGBRITEM(  GERBER_DRAW_ITEM* aGbrItem,
  */
 static void fillArcGBRITEM(  GERBER_DRAW_ITEM* aGbrItem, int Dcode_index, int aLayer,
                              const wxPoint& aStart, const wxPoint& aEnd,
-                             const wxPoint& rel_center, int aWidth,
-                             bool clockwise, bool multiquadrant,
+                             const wxPoint& aRelCenter, int aWidth,
+                             bool aClockwise, bool aMultiquadrant,
                              bool aLayerNegative,
                              bool aImageNegative  )
 {
@@ -236,52 +239,75 @@ static void fillArcGBRITEM(  GERBER_DRAW_ITEM* aGbrItem, int Dcode_index, int aL
     aGbrItem->m_Size.x  = aGbrItem->m_Size.y = aWidth;
     aGbrItem->m_Flashed = false;
 
-    if( multiquadrant )
-    {
-        center.x = aStart.x + rel_center.x;
-        center.y = aStart.y + rel_center.y;
 
-        if( clockwise )
-        {
-            aGbrItem->m_Start = aStart;
-            aGbrItem->m_End   = aEnd;
-        }
+    if( aMultiquadrant )
+        center = aStart + aRelCenter;
     else
     {
-            aGbrItem->m_Start = aEnd;
-            aGbrItem->m_End   = aStart;
-        }
-    }
-    else
-    {
-        center = rel_center;
+        // in single quadrant mode the relative coordinate aRelCenter is always >= 0
+        // So we must recalculate the actual sign of aRelCenter.x and aRelCenter.y
+        center = aRelCenter;
+
+        // calculate arc end coordinate relative to the staring point,
+        // because center is relative to the center point
         delta  = aEnd - aStart;
 
+        // now calculate the relative to aStart center position, for a draw function
+        // that use trigonometric arc angle (or counter-clockwise)
+        /* Quadrants:
+         *    Y
+         *  2 | 1
+         * -------X
+         *  3 | 4
+         * C = actual relative arc center, S = arc start (axis origin) E = relative arc end
+         */
         if( (delta.x >= 0) && (delta.y >= 0) )
         {
-            // Quadrant 2
+        /* Quadrant 1 (trigo or cclockwise):
+         *  C | E
+         * ---S---
+         *  3 | 4
+         */
+            NEGATE( center.x);
         }
         else if( (delta.x >= 0) && (delta.y < 0) )
         {
-            // Quadrant 1
-            center.y = -center.y;
+        /* Quadrant 4 (trigo or cclockwise):
+         *  2 | C
+         * ---S---
+         *  3 | E
+         */
+        // Nothing to do
         }
         else if( (delta.x < 0) && (delta.y >= 0) )
         {
-            // Quadrant 4
-            center.x = -center.x;
+        /* Quadrant 2 (trigo or cclockwise):
+         *  E | 1
+         * ---S---
+         *  C | 4
+         */
+            NEGATE( center.x);
+            NEGATE( center.y);
         }
         else
         {
-            // Quadrant 3
-            center.x = -center.x;
-            center.y = -center.y;
+        /* Quadrant 3 (trigo or cclockwise):
+         *  2 | 1
+         * ---S---
+         *  E | C
+         */
+            NEGATE( center.y);
         }
 
-        center.x += aStart.x;
-        center.y += aStart.y;
+        // Due to your draw arc function, we need this:
+        if( !aClockwise )
+            center = - center;
 
-        if( clockwise )
+        // Calculate actual arc center coordinate:
+        center += aStart;
+    }
+
+    if( aClockwise )
     {
         aGbrItem->m_Start = aStart;
         aGbrItem->m_End   = aEnd;
@@ -291,11 +317,10 @@ static void fillArcGBRITEM(  GERBER_DRAW_ITEM* aGbrItem, int Dcode_index, int aL
         aGbrItem->m_Start = aEnd;
         aGbrItem->m_End   = aStart;
     }
-    }
 
-    aGbrItem->m_DCode     = Dcode_index;
     aGbrItem->m_ArcCentre = center;
 
+    aGbrItem->m_DCode     = Dcode_index;
     aGbrItem->m_LayerNegative = aLayerNegative;
     aGbrItem->m_ImageNegative = aImageNegative;
 
@@ -370,68 +395,51 @@ static void fillArcPOLY(  BOARD* aPcb, GERBER_DRAW_ITEM* aGbrItem,
                      aStart, aEnd, rel_center, 0,
                      clockwise, multiquadrant, aLayerNegative, aImageNegative );
 
-    // dummyTrack has right geometric parameters, and has its Y coordinates negated (to match the pcbnew Y axis).
-    // Approximate arc by 36 segments per 360 degree
-    const int increment_angle = 360 / 36;
-
     wxPoint   center;
     center = dummyGbrItem.m_ArcCentre;
 
-    // Calculate relative coordinates;
+    // Calculate coordinates relative to arc center;
     wxPoint start = dummyGbrItem.m_Start - center;
     wxPoint end   = dummyGbrItem.m_End - center;
 
     /* Calculate angle arc
-     * angle is here clockwise because Y axis is reversed
+     * angles are in 0.1 deg
+     * angle is trigonometrical (counter-clockwise),
+     * and axis is the X,Y gerber coordinates
      */
-    double start_angle = atan2( (double) start.y, (double) start.x );
-    start_angle = 180 * start_angle / M_PI;
-    double end_angle = atan2( (double) end.y, (double) end.x );
-    end_angle = 180 * end_angle / M_PI;
-    double angle = start_angle - end_angle;
-
-//    D( printf( " >>>> st %d,%d angle %f, end %d,%d angle %f delta %f\n",
-//        start.x, start.y, start_angle, end.x, end.y, end_angle, angle ) );
-    if( !clockwise )
-    {
-        EXCHG( start, end );
-        D( printf( " >>>> reverse arc\n" ) );
-    }
-
-    // Normalize angle
-    while( angle > 360.0 )
-        angle -= 360.0;
-
-    while( angle < 0.0 )
-        angle += 360.0;
-
-    int count = (int) ( angle / increment_angle );
-    if( count <= 0 )
-        count = 1;
-
-//    D( printf( " >>>> angle %f, cnt %d sens %d\n", angle, count, clockwise ) );
+    int start_angle = wxRound(atan2( (double) start.y, (double) start.x ) * 1800 / M_PI);
+    int end_angle = wxRound(atan2( (double) end.y, (double) end.x ) * 1800 / M_PI);
+
+    // dummyTrack has right geometric parameters, but
+    // fillArcGBRITEM calculate arc parameters for a draw function that expects
+    // start_angle < end_angle. So ensure this is the case here:
+    // Due to the fact atan2 returns angles between -180 to + 180 degrees,
+    // this not always the case ( a modulo 360.0 degrees can be lost )
+    if( start_angle > end_angle )
+        end_angle += 3600;
+
+    int arc_angle = start_angle - end_angle;
+    // Approximate arc by 36 segments per 360 degree
+    int increment_angle = 3600 / 36;
+    int count = ABS( arc_angle / increment_angle );
 
-    // calculate segments
+    // calculate polygon corners
+    // when not clockwise, dummyGbrItem arc goes from end to start
     wxPoint start_arc = start;
-    for( int ii = 1; ii <= count; ii++ )
+    for( int ii = 0; ii <= count; ii++ )
     {
+        int rot;
         wxPoint end_arc = start;
-        int     rot     = 10 * ii * increment_angle; // rot is in 0.1 deg
-        if( ii < count )
-        {
         if( clockwise )
-                RotatePoint( &end_arc, rot );
-            else
-                RotatePoint( &end_arc, -rot );
-        }
+            rot = ii * increment_angle; // rot is in 0.1 deg
         else
-            end_arc = end;
+            rot = (count - ii) * increment_angle; // rot is in 0.1 deg
 
-//        D( printf( " >> Add arc %d rot %d, edge poly item %d,%d to %d,%d\n",
-//                ii, rot, start_arc.x, start_arc.y,end_arc.x, end_arc.y ); )
+        if( ii < count )
+                RotatePoint( &end_arc, -rot );
+        else    // last point
+            end_arc = clockwise ? end : start;
 
-        if( aGbrItem->m_PolyCorners.size() == 0 )
-            aGbrItem->m_PolyCorners.push_back( start_arc + center );
         aGbrItem->m_PolyCorners.push_back( end_arc + center );
 
         start_arc = end_arc;
@@ -472,6 +480,7 @@ wxPoint GERBER::ReadXYCoord( char*& Text )
             {
                 if( *Text == '.' )
                     is_float = true;
+
                 // count digits only (sign and decimal point are not counted)
                 if( (*Text >= '0') && (*Text <='9') )
                     nbdigits++;
@@ -568,6 +577,7 @@ wxPoint GERBER::ReadIJCoord( char*& Text )
             {
                 if( *Text == '.' )
                     is_float = true;
+
                 // count digits only (sign and decimal point are not counted)
                 if( (*Text >= '0') && (*Text <='9') )
                     nbdigits++;
@@ -737,7 +747,7 @@ bool GERBER::Execute_G_Command( char*& text, int G_commande )
 
     case GC_TURN_OFF_360_INTERPOL:      // disable Multi cadran arc and Arc interpol
         m_360Arc_enbl  = false;
-        m_Iterpolation = GERB_INTERPOL_LINEAR_1X;
+        m_Iterpolation = GERB_INTERPOL_LINEAR_1X;   // not sure it should be done
         break;
 
     case GC_TURN_ON_360_INTERPOL:
@@ -865,6 +875,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
             case GERB_INTERPOL_ARC_NEG:
             case GERB_INTERPOL_ARC_POS:
                 gbritem = (GERBER_DRAW_ITEM*)( pcb->m_Drawings.GetLast() );
+
                 //               D( printf( "Add arc poly %d,%d to %d,%d fill %d interpol %d 360_enb %d\n",
                 //                          m_PreviousPos.x, m_PreviousPos.y, m_CurrentPos.x,
                 //                          m_CurrentPos.y, m_PolygonFillModeState,
@@ -877,6 +888,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
 
             default:
                 gbritem = (GERBER_DRAW_ITEM*)( pcb->m_Drawings.GetLast() );
+
 //                D( printf( "Add poly edge %d,%d to %d,%d fill %d\n",
 //                           m_PreviousPos.x, m_PreviousPos.y,
 //                           m_CurrentPos.x, m_CurrentPos.y, m_Iterpolation ); )
@@ -931,6 +943,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
             case GERB_INTERPOL_LINEAR_1X:
                 gbritem = new GERBER_DRAW_ITEM( pcb, this );
                 pcb->m_Drawings.Append( gbritem );
+
 //                D( printf( "Add line %d,%d to %d,%d\n",
 //                           m_PreviousPos.x, m_PreviousPos.y,
 //                            m_CurrentPos.x, m_CurrentPos.y ); )
@@ -948,6 +961,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
             case GERB_INTERPOL_ARC_POS:
                 gbritem = new GERBER_DRAW_ITEM( pcb, this );
                 pcb->m_Drawings.Append( gbritem );
+
 //                D( printf( "Add arc %d,%d to %d,%d center %d, %d interpol %d 360_enb %d\n",
 //                           m_PreviousPos.x, m_PreviousPos.y, m_CurrentPos.x,
 //                           m_CurrentPos.y, m_IJPos.x,
@@ -971,6 +985,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
 
         case 2:     // code D2: exposure OFF (i.e. "move to")
             m_Exposure = false;
+
 //            D( printf( "Move to %d,%d to %d,%d\n",
 //                       m_PreviousPos.x, m_PreviousPos.y,
 //                        m_CurrentPos.x, m_CurrentPos.y ); )
@@ -988,6 +1003,7 @@ bool GERBER::Execute_DCODE_Command( WinEDA_GerberFrame* frame, char*& text, int
 
             gbritem = new GERBER_DRAW_ITEM( pcb, this );
             pcb->m_Drawings.Append( gbritem );
+
 //          D( printf( "Add flashed dcode %d layer %d at %d %d\n", dcode, activeLayer,
 //                                m_CurrentPos.x, m_CurrentPos.y ); )
             fillFlashedGBRITEM( gbritem, aperture,

gerbview/tracepcb.cpp

@@ -159,7 +159,7 @@ void Show_Items_DCode_Value( WinEDA_DrawPanel* aPanel, wxDC* aDC, BOARD* aPcb, i
         if( gerb_item->m_DCode <= 0 )
             continue;
 
-        if( gerb_item->m_Flashed )
+        if( gerb_item->m_Flashed || gerb_item->m_Shape == GBR_ARC )
             pos = gerb_item->m_Start;
         else
         {