Gerbview: Fix 2 (minor) issues in aperture macro "moire". Add a .gbr test file for this aperture macro.

common/convert_basic_shapes_to_polygon.cpp

@@ -283,16 +283,23 @@ void TransformRingToPolygon( SHAPE_POLY_SET& aCornerBuffer,
                              wxPoint aCentre, int aRadius,
                              int aCircleToSegmentsCount, int aWidth )
 {
-    int     delta = 3600 / aCircleToSegmentsCount;   // rotate angle in 0.1 degree
-
-    // Compute the corners posituions and creates poly
+    // Compute the corners positions and creates the poly
     wxPoint curr_point;
     int     inner_radius    = aRadius - ( aWidth / 2 );
     int     outer_radius    = inner_radius + aWidth;
 
+    if( inner_radius <= 0 )
+    {   //In this case, the ring is just a circle (no hole inside)
+        TransformCircleToPolygon( aCornerBuffer, aCentre, aRadius + ( aWidth / 2 ),
+                                  aCircleToSegmentsCount );
+        return;
+    }
+
     aCornerBuffer.NewOutline();
 
     // Draw the inner circle of the ring
+    int     delta = 3600 / aCircleToSegmentsCount;   // rotate angle in 0.1 degree
+
     for( int ii = 0; ii < 3600; ii += delta )
     {
         curr_point.x    = inner_radius;

gerbview/class_am_param.h

@@ -63,7 +63,7 @@
  *  %AMMOIRE10*
  *  6,0,0,0.350000,0.005,0.050,3,0.005,0.400000,0.0*%
  *  Example of instanciation:
- *  %ADD19THERM19*%
+ *  %ADD19MOIRE10*%
  *
  *  A simple definition, one parameter:
  *  %AMCIRCLE*

gerbview/class_aperture_macro.cpp

@@ -280,15 +280,25 @@ void AM_PRIMITIVE::DrawBasicShape( GERBER_DRAW_ITEM* aParent,
         // Draw circles:
         wxPoint center = aParent->GetABPosition( curPos );
         // adjust outerDiam by this on each nested circle
-        int diamAdjust = (gap + penThickness); //*2;     //Should we use * 2 ?
+        int diamAdjust = (gap + penThickness) * 2;
 
         for( int i = 0; i < numCircles; ++i, outerDiam -= diamAdjust )
         {
             if( outerDiam <= 0 )
                 break;
 
-            TransformRingToPolygon( aShapeBuffer, center,
-                                    (outerDiam - penThickness) / 2, seg_per_circle, penThickness );
+            // Note: outerDiam is the outer diameter of the ring.
+            // the ring graphic diameter is (outerDiam - penThickness)
+            if( outerDiam <= penThickness )
+            {   // No room to draw a ring (no room for the hole):
+                // draw a circle instead (with no hole), with the right diameter
+                TransformCircleToPolygon( aShapeBuffer, center,
+                                          outerDiam / 2, seg_per_circle );
+            }
+            else
+                TransformRingToPolygon( aShapeBuffer, center,
+                                        (outerDiam - penThickness) / 2,
+                                        seg_per_circle, penThickness );
         }
 
         // Draw the cross:

gerbview/gerber_test_files/aperture_macro_moire.gbr

@@ -0,0 +1,32 @@
+G04 Verification of moire aperture macro *
+%MOMM*%
+%FSLAX23Y23*%
+%OFA0.0000B0.0000*%
+G90*
+G04 parameters are
+G04 1 X coordinate of center point, a decimal*
+G04 2 Y coordinate of center point, a decimal*
+G04 3 Outer diameter of outer concentric ring, a decimal >= 0*
+G04 4 Ring thickness, a decimal >= 0*
+G04 5 Gap between rings, a decimal >= 0*
+G04 6 Maximum number of rings, an integer >= 0*
+G04 7 Cross hair thickness, a decimal >= 0*
+G04 8 Cross hair length, a decimal >= 0*
+G04 9 Rotation angle of the moiré primitive*
+%AMMOIRE*
+6,0,0, 11.0,1.3,1.2,6, 0.2,14, 20*
+%
+G04 Outline*
+%ADD10C,0.1*%
+X0Y0D02*
+G54D10*
+X0Y0D01*
+X40000D01*
+Y40000D01*
+X0D01*
+Y0D01*
+G04 Draw Moire *
+%ADD10MOIRE*%
+G54D10*
+X20000Y20000D03*
+M02*