SVG loading should detect if a polygon is a hole when the polygon is

created.

.gitignore

@@ -34,3 +34,4 @@ html
 /SVGExportTest5.svg
 /box.svg.png
 /brokenSTL.STL.png
+/InsideOutsideTest.svg.png

src/main/java/eu/mihosoft/vrl/v3d/Polygon.java

@@ -63,7 +63,7 @@ public final class Polygon {
      *  Note:  uses first three vertices to define the plane.
      */
     public  Plane plane;
-
+     private boolean isHole = false;
 
     /**
      * Sets the storage.
@@ -191,7 +191,6 @@ private void validateAndInit( boolean allowDegenerate) {
 			// throw runtimeException;
 			new RuntimeException("This polygon is colinear").printStackTrace();
 		}
-
 	}
     /**
      * Constructor. Creates a new polygon that consists of the specified
@@ -748,4 +747,12 @@ public String toString() {
 		return ret+" ] ";
 	}
 
+	public boolean isHole() {
+		return isHole;
+	}
+
+	public void setHole(boolean isHole) {
+		this.isHole = isHole;
+	}
+
 }

src/main/java/eu/mihosoft/vrl/v3d/svg/SVGLoad.java

@@ -637,15 +637,18 @@ private void loadSingle(String code, double resolution, Transform startingFrame,
 			point.transform(new Transform().rotZ(-180));
 			point.transform(new Transform().rotY(180));
 		}
-
+		
 		// //com.neuronrobotics.sdk.common.Log.error(" Path " + code);
 		Polygon poly = Polygon.fromPoints(p);
+		boolean hole = !Extrude.isCCW(poly);
 		if (getPolygonByLayers() == null)
 			setPolygonByLayers(new HashMap<String, List<Polygon>>());
 		if (getPolygonByLayers().get(encapsulatingLayer) == null)
 			getPolygonByLayers().put(encapsulatingLayer, new ArrayList<Polygon>());
 		List<Polygon> list = getPolygonByLayers().get(encapsulatingLayer);
+
 		poly = Polygon.fromPoints(Extrude.toCCW(poly.getPoints()));
+		poly.setHole(hole);
 		if (c != null)
 			colors.put(poly, c);
 		list.add(poly);
@@ -699,6 +702,7 @@ public HashMap<String, ArrayList<CSG>> extrudeLayers(double t, double resolution
 			ArrayList<CSG> parts = csgByLayers.get(key);
 			parts.clear();
 			for (Polygon p : getPolygonByLayers().get(key)) {
+				boolean isHole =p.isHole();
 				CSG newbit;
 				try {
 					newbit = Extrude.getExtrusionEngine().extrude(new Vector3d(0, 0, thickness), p);
@@ -708,6 +712,11 @@ public HashMap<String, ArrayList<CSG>> extrudeLayers(double t, double resolution
 					if (colors.get(p) != null) {
 						newbit.setColor(colors.get(p));
 					}
+					if(isHole) {
+						//newbit=newbit.movez(negativeThickness?0.5:-0.5);
+						newbit.setIsHole(true);
+						newbit.setColor(Color.BLACK);
+					}
 					parts.add(newbit);
 				} catch (Exception ex) {
 					//ex.printStackTrace();

src/test/java/eu/mihosoft/vrl/v3d/SVGLoadTest.java

@@ -30,8 +30,22 @@ public void box() throws IOException {
 			// Auto-generated catch block
 			e.printStackTrace();
 		}
-
-		// fail("Not yet implemented");
+	}
+	@Test
+	public void inside() throws IOException {
+		JavaFXInitializer.go();
+		File svg = new File("InsideOutsideTest.svg");
+		if (!svg.exists())
+			throw new RuntimeException("Test file missing!" + svg.getAbsolutePath());
+		SVGLoad s = new SVGLoad(svg.toURI());
+		ArrayList<CSG>parts =run(s);
+		try {
+			ThumbnailImage.setCullFaceValue(CullFace.NONE);
+			ThumbnailImage.writeImage(parts,new File(svg.getAbsolutePath()+".png")).join();
+		} catch (InterruptedException e) {
+			// Auto-generated catch block
+			e.printStackTrace();
+		}
 	}
 	@Test
 	public void adversarial() throws IOException {
@@ -82,7 +96,7 @@ private ArrayList<CSG> run(SVGLoad s) {
 				//System.out.println("Adding layer: "+key);
 				ArrayList<CSG> csgs = extrudeLayerToCSG.get(key);
 				if(csgs.size()>0)
-					polys.add(CSG.unionAll(csgs));
+					polys.addAll(csgs);
 //				for(CSG c:extrudeLayerToCSG.get(key)) {
 //					polys.add(c);
 //				}