C# SpatialContext.MakeRect方法代码示例

        public void testMakeRect(SpatialContext ctx)
        {
            this.ctx = ctx;

            //test rectangle constructor
            Assert.Equal(new RectangleImpl(1, 3, 2, 4),
                new RectangleImpl(new PointImpl(1, 2), new PointImpl(3, 4)));

            //test ctx.makeRect
            Assert.Equal(ctx.MakeRect(1, 3, 2, 4),
                ctx.MakeRect(ctx.MakePoint(1, 2), ctx.MakePoint(3, 4)));
        }

        public static Rectangle CalcBoxByDistFromPtDEG(double lat, double lon, double distance, SpatialContext ctx)
        {
            //See http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates Section 3.1, 3.2 and 3.3

            double radius = ctx.GetUnits().EarthRadius();
            double dist_deg = Dist2Degrees(distance, radius);

            if (dist_deg == 0)
                return ctx.MakeRect(lon, lon, lat, lat);//essentially a point

            if (dist_deg >= 180)//distance is >= opposite side of the globe
                return ctx.GetWorldBounds();

            //--calc latitude bounds
            double latN_deg = lat + dist_deg;
            double latS_deg = lat - dist_deg;

            if (latN_deg >= 90 || latS_deg <= -90)
            {//touches either pole
                //we have special logic for longitude
                double lonW_deg = -180, lonE_deg = 180;//world wrap: 360 deg
                if (latN_deg <= 90 && latS_deg >= -90)
                {//doesn't pass either pole: 180 deg
                    lonW_deg = lon - 90;
                    lonE_deg = lon + 90;
                }
                if (latN_deg > 90)
                    latN_deg = 90;
                if (latS_deg < -90)
                    latS_deg = -90;

                return ctx.MakeRect(lonW_deg, lonE_deg, latS_deg, latN_deg);
            }
            else
            {
                //--calc longitude bounds
                double lon_delta_deg = CalcBoxByDistFromPt_deltaLonDEG(lat, lon, distance, radius);

                double lonW_deg = lon - lon_delta_deg;
                double lonE_deg = lon + lon_delta_deg;

                return ctx.MakeRect(lonW_deg, lonE_deg, latS_deg, latN_deg);//ctx will normalize longitude
            }
        }

        /// <summary>
        /// WARNING: geoms is copied by reference.
        /// </summary>
        /// <param name="geoms"></param>
        /// <param name="ctx"></param>
        public MultiShape(IEnumerable<Shape> geoms, SpatialContext ctx)
        {
            if (!geoms.Any())
              throw new ArgumentException("must be given at least 1 shape", "geoms");

            this.geoms = geoms;

            //compute and cache bbox
            double minX = Double.PositiveInfinity;
            double minY = Double.PositiveInfinity;
            double maxX = Double.NegativeInfinity;
            double maxY = Double.NegativeInfinity;
            foreach (var geom in geoms)
            {
                Rectangle r = geom.GetBoundingBox();
                minX = Math.Min(minX, r.GetMinX());
                minY = Math.Min(minY, r.GetMinY());
                maxX = Math.Max(maxX, r.GetMaxX());
                maxY = Math.Max(maxY, r.GetMaxY());
            }
            this.bbox = ctx.MakeRect(minX, maxX, minY, maxY);
        }

 public override Rectangle CalcBoxByDistFromPt(Point @from, double distance, SpatialContext ctx)
 {
     return ctx.MakeRect(from.GetX() - distance, from.GetX() + distance, from.GetY() - distance, from.GetY() + distance);
 }

        public void TestSimpleCircle(SpatialContext ctx)
        {
            base.ctx = ctx;

            double[] theXs = new double[] { -10, 0, 10 };
            foreach (double x in theXs)
            {
                double[] theYs = new double[] { -20, 0, 20 };
                foreach (double y in theYs)
                {
                    TestCircle(x, y, 0);
                    TestCircle(x, y, 5);
                }
            }
            //INTERSECTION:
            //Start with some static tests that have shown to cause failures at some point:
            Assert.Equal( /*"getX not getY",*/
                SpatialRelation.INTERSECTS,
                ctx.MakeCircle(107, -81, 147).Relate(ctx.MakeRect(92, 121, -89, 74), ctx));

            TestCircleIntersect();
        }

        public void TestGeoCircle(SpatialContext ctx)
        {
            base.ctx = ctx;

            //--Start with some static tests that once failed:

            //Bug: numeric edge at pole, fails to init
            ctx.MakeCircle(110, -12, ctx.GetDistCalc().DegreesToDistance(90 + 12));

            //Bug: horizXAxis not in enclosing rectangle, assertion
            ctx.MakeCircle(-44, 16, DegToDist(106));
            ctx.MakeCircle(-36, -76, DegToDist(14));
            ctx.MakeCircle(107, 82, DegToDist(172));

            // TODO need to update this test to be valid
            //{
            //    //Bug in which distance was being confused as being in the same coordinate system as x,y.
            //    double distDeltaToPole = 0.001;//1m
            //    double distDeltaToPoleDEG = ctx.getDistCalc().distanceToDegrees(distDeltaToPole);
            //    double dist = 1;//1km
            //    double distDEG = ctx.getDistCalc().distanceToDegrees(dist);
            //    Circle c = ctx.makeCircle(0, 90 - distDeltaToPoleDEG - distDEG, dist);
            //    Rectangle cBBox = c.getBoundingBox();
            //    Rectangle r = ctx.makeRect(cBBox.getMaxX() * 0.99, cBBox.getMaxX() + 1, c.getCenter().getY(), c.getCenter().getY());
            //    assertEquals(INTERSECTS, c.getBoundingBox().relate(r, ctx));
            //    assertEquals("dist != xy space", INTERSECTS, c.relate(r, ctx));//once failed here
            //}

            Assert.Equal(/*"nudge back circle", */ SpatialRelation.CONTAINS, ctx.MakeCircle(-150, -90, DegToDist(122)).Relate(ctx.MakeRect(0, -132, 32, 32), ctx));

            Assert.Equal(/* "wrong estimate", */ SpatialRelation.DISJOINT, ctx.MakeCircle(-166, 59, 5226.2).Relate(ctx.MakeRect(36, 66, 23, 23), ctx));

            Assert.Equal(/*"bad CONTAINS (dateline)",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(56, -50, 12231.5).Relate(ctx.MakeRect(108, 26, 39, 48), ctx));

            Assert.Equal(/*"bad CONTAINS (backwrap2)",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(112, -3, DegToDist(91)).Relate(ctx.MakeRect(-163, 29, -38, 10), ctx));

            Assert.Equal(/*"bad CONTAINS (r x-wrap)",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(-139, 47, DegToDist(80)).Relate(ctx.MakeRect(-180, 180, -3, 12), ctx));

            Assert.Equal(/*"bad CONTAINS (pwrap)",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(-139, 47, DegToDist(80)).Relate(ctx.MakeRect(-180, 179, -3, 12), ctx));

            Assert.Equal(/*"no-dist 1",*/ SpatialRelation.WITHIN,
                ctx.MakeCircle(135, 21, 0).Relate(ctx.MakeRect(-103, -154, -47, 52), ctx));

            Assert.Equal(/*"bbox <= >= -90 bug",*/ SpatialRelation.CONTAINS,
                ctx.MakeCircle(-64, -84, DegToDist(124)).Relate(ctx.MakeRect(-96, 96, -10, -10), ctx));

            //The horizontal axis line of a geo circle doesn't necessarily pass through c's ctr.
            Assert.Equal(/*"c's horiz axis doesn't pass through ctr",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(71, -44, DegToDist(40)).Relate(ctx.MakeRect(15, 27, -62, -34), ctx));

            Assert.Equal(/*"pole boundary",*/ SpatialRelation.INTERSECTS,
                ctx.MakeCircle(-100, -12, DegToDist(102)).Relate(ctx.MakeRect(143, 175, 4, 32), ctx));

            Assert.Equal(/*"full circle assert",*/ SpatialRelation.CONTAINS,
                ctx.MakeCircle(-64, 32, DegToDist(180)).Relate(ctx.MakeRect(47, 47, -14, 90), ctx));

            //--Now proceed with systematic testing:

            double distToOpposeSide = ctx.GetUnits().EarthRadius() * Math.PI;
            Assert.Equal(ctx.GetWorldBounds(), ctx.MakeCircle(0, 0, distToOpposeSide).GetBoundingBox());
            //assertEquals(ctx.makeCircle(0,0,distToOpposeSide/2 - 500).getBoundingBox());

            double[] theXs = new double[] { -180, -45, 90 };
            foreach (double x in theXs)
            {
                double[] theYs = new double[] { -90, -45, 0, 45, 90 };
                foreach (double y in theYs)
                {
                    TestCircle(x, y, 0);
                    TestCircle(x, y, 500);
                    TestCircle(x, y, DegToDist(90));
                    TestCircle(x, y, ctx.GetUnits().EarthRadius() * 6);
                }
            }

            TestCircleIntersect();
        }

        public void TestGeoRectangle(SpatialContext ctx)
        {
            base.ctx = ctx;

            //First test some relateXRange
            //    opposite +/- 180
            Assert.Equal(SpatialRelation.INTERSECTS, ctx.MakeRect(170, 180, 0, 0).RelateXRange(-180, -170, ctx));
            Assert.Equal(SpatialRelation.INTERSECTS, ctx.MakeRect(-90, -45, 0, 0).RelateXRange(-45, -135, ctx));
            Assert.Equal(SpatialRelation.CONTAINS, ctx.GetWorldBounds().RelateXRange(-90, -135, ctx));
            //point on edge at dateline using opposite +/- 180
            Assert.Equal(SpatialRelation.CONTAINS, ctx.MakeRect(170, 180, 0, 0).Relate(ctx.MakePoint(-180, 0), ctx));

            //test 180 becomes -180 for non-zero width rectangle
            Assert.Equal(ctx.MakeRect(-180, -170, 0, 0), ctx.MakeRect(180, -170, 0, 0));
            Assert.Equal(ctx.MakeRect(170, 180, 0, 0), ctx.MakeRect(170, -180, 0, 0));

            double[] lons = new double[] { 0, 45, 160, 180, -45, -175, -180 }; //minX
            foreach (double lon in lons)
            {
                double[] lonWs = new double[] { 0, 20, 180, 200, 355, 360 }; //width
                foreach (double lonW in lonWs)
                {
                    TestRectangle(lon, lonW, 0, 0);
                    TestRectangle(lon, lonW, -10, 10);
                    TestRectangle(lon, lonW, 80, 10); //polar cap
                    TestRectangle(lon, lonW, -90, 180); //full lat range
                }
            }

            //Test geo rectangle intersections
            TestRectIntersect();
        }

        /** Returns min-max lat, min-max lon. */
        public static Rectangle DecodeBoundary(String geohash, SpatialContext ctx)
        {
            double minY = -90, maxY = 90, minX = -180, maxX = 180;
            bool isEven = true;

            for (int i = 0; i < geohash.Length; i++)
            {
                char c = geohash[i];
                if (c >= 'A' && c <= 'Z')
                    c = Convert.ToChar(c - Convert.ToChar('A' - 'a'));

                int cd = BASE_32_IDX[c - BASE_32[0]]; //TODO check successful?

                foreach (var mask in BITS)
                {
                    if (isEven)
                    {
                        if ((cd & mask) != 0)
                        {
                            minX = (minX + maxX) / 2D;
                        }
                        else
                        {
                            maxX = (minX + maxX) / 2D;
                        }
                    }
                    else
                    {
                        if ((cd & mask) != 0)
                        {
                            minY = (minY + maxY) / 2D;
                        }
                        else
                        {
                            maxY = (minY + maxY) / 2D;
                        }
                    }
                    isEven = !isEven;
                }
            }
            return ctx.MakeRect(minX, maxX, minY, maxY);
        }