LUCENE-7221: Fix broken bounds for GeoCircles.

lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/Plane.java

@@ -926,6 +926,8 @@ public class Plane extends Vector {
         if (Math.abs(sqrtTerm) < MINIMUM_RESOLUTION_SQUARED) {
           // One solution
           final double m = -b / (2.0 * a);
+          // Valid?
+          if (Math.abs(m) >= MINIMUM_RESOLUTION) {
             final double l = r * m + q;
             // x = ((1 - l*A) * ab^2 ) / (2 * m)
             // y = (-l*B * ab^2) / ( 2 * m)
@@ -937,6 +939,10 @@ public class Plane extends Vector {
             //  (thePoint.x*thePoint.x*planetModel.inverseAb*planetModel.inverseAb + thePoint.y*thePoint.y*planetModel.inverseAb*planetModel.inverseAb + thePoint.z*thePoint.z*planetModel.inverseC*planetModel.inverseC);
             //assert evaluateIsZero(thePoint): "Evaluation of point: "+evaluate(thePoint);
             addPoint(boundsInfo, bounds, thePoint);
+          } else {
+            // This is a plane of the form A=n B=0 C=0.  We can set a bound only by noting the D value.
+            boundsInfo.addXValue(-D/A);
+          }
         } else if (sqrtTerm > 0.0) {
           // Two solutions
           final double sqrtResult = Math.sqrt(sqrtTerm);
@@ -1089,6 +1095,8 @@ public class Plane extends Vector {
         if (Math.abs(sqrtTerm) < MINIMUM_RESOLUTION_SQUARED) {
           // One solution
           final double m = -b / (2.0 * a);
+          // Valid?
+          if (Math.abs(m) >= MINIMUM_RESOLUTION) {
             final double l = r * m + q;
             // x = (-l*A * ab^2 ) / (2 * m)
             // y = ((1.0-l*B) * ab^2) / ( 2 * m)
@@ -1100,6 +1108,10 @@ public class Plane extends Vector {
             //  (thePoint1.x*thePoint.x*planetModel.inverseAb*planetModel.inverseAb + thePoint.y*thePoint.y*planetModel.inverseAb*planetModel.inverseAb + thePoint.z*thePoint.z*planetModel.inverseC*planetModel.inverseC);
             //assert evaluateIsZero(thePoint): "Evaluation of point: "+evaluate(thePoint);
             addPoint(boundsInfo, bounds, thePoint);
+          } else {
+            // This is a plane of the form A=0 B=n C=0.  We can set a bound only by noting the D value.
+            boundsInfo.addYValue(-D/B);
+          }
         } else if (sqrtTerm > 0.0) {
           // Two solutions
           final double sqrtResult = Math.sqrt(sqrtTerm);

lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/XYZBounds.java

@@ -195,7 +195,14 @@ public class XYZBounds implements Bounds {
 
   @Override
   public Bounds addXValue(final GeoPoint point) {
-    final double x = point.x;
+    return addXValue(point.x);
+  }
+  
+  /** Add a specific X value.
+   * @param x is the value to add.
+   * @return the bounds object.
+   */
+  public Bounds addXValue(final double x) {
     final double small = x - FUDGE_FACTOR;
     if (minX == null || minX > small) {
       minX = new Double(small);
@@ -209,7 +216,14 @@ public class XYZBounds implements Bounds {
 
   @Override
   public Bounds addYValue(final GeoPoint point) {
-    final double y = point.y;
+    return addYValue(point.y);
+  }
+  
+  /** Add a specific Y value.
+   * @param y is the value to add.
+   * @return the bounds object.
+   */
+  public Bounds addYValue(final double y) {
     final double small = y - FUDGE_FACTOR;
     if (minY == null || minY > small) {
       minY = new Double(small);
@@ -223,7 +237,14 @@ public class XYZBounds implements Bounds {
 
   @Override
   public Bounds addZValue(final GeoPoint point) {
-    final double z = point.z;
+    return addZValue(point.z);
+  }
+  
+  /** Add a specific Z value.
+   * @param z is the value to add.
+   * @return the bounds object.
+   */
+  public Bounds addZValue(final double z) {
     final double small = z - FUDGE_FACTOR;
     if (minZ == null || minZ > small) {
       minZ = new Double(small);
@@ -264,4 +285,9 @@ public class XYZBounds implements Bounds {
     return this;
   }
 
+  @Override
+  public String toString() {
+    return "XYZBounds: [xmin="+minX+" xmax="+maxX+" ymin="+minY+" ymax="+maxY+" zmin="+minZ+" zmax="+maxZ+"]";
+  }
+  
 }

lucene/spatial3d/src/test/org/apache/lucene/spatial3d/geom/GeoCircleTest.java

@@ -392,4 +392,21 @@ public class GeoCircleTest extends LuceneTestCase {
 
   }
 
+  @Test
+  public void testBoundsFailureCase1() {
+    // lat=2.7399499693409367E-13, lon=-3.141592653589793([X=-1.0011188539924791, Y=-1.226017000107956E-16, Z=2.743015573303327E-13])], radius=2.1814042682464985
+    final GeoCircle gc = GeoCircleFactory.makeGeoCircle(PlanetModel.WGS84, 2.7399499693409367E-13, -3.141592653589793, 2.1814042682464985);
+    // With a circle like this, zmin should equal zmax, and xmin should be PlanetModel.minimumX.
+    final GeoPoint gp = new GeoPoint(0.0054866241253590815, -0.004009749293376541, 0.997739304376186);
+    final GeoPoint gpOnSurface = PlanetModel.WGS84.createSurfacePoint(gp);
+    final XYZBounds bounds = new XYZBounds();
+    gc.getBounds(bounds);
+    //System.out.println("Bounds: "+bounds);
+    final XYZSolid solid = XYZSolidFactory.makeXYZSolid(PlanetModel.WGS84, bounds.getMinimumX(), bounds.getMaximumX(), bounds.getMinimumY(), bounds.getMaximumY(), bounds.getMinimumZ(), bounds.getMaximumZ());
+    assertTrue(gc.isWithin(gpOnSurface));
+    assertTrue(gc.isWithin(gp));
+    assertTrue(solid.isWithin(gpOnSurface)); // This fails
+    assertTrue(solid.isWithin(gp));
+  }
+  
 }