| @@ -229,7 +229,14 @@ |
| |
| private ArrayList<PGTools.PolygonLatLon.PointLatLon> points; |
| private Boolean bValid; |
| + |
| + public enum ESRIContourType { |
| |
| + outer, inner, unknown |
| + }; |
| + |
| + protected ESRIContourType myRotation; |
| + |
| public PolygonLatLon() { |
| this.bValid = true; |
| this.points = new ArrayList<>(); |
| @@ -285,9 +292,68 @@ |
| } |
| |
| public Boolean isValid() { |
| + this.getRotation(); |
| return this.bValid; |
| } |
| + |
| + protected void swapRotation() { |
| + ArrayList<PointLatLon> newPoints = new ArrayList<>(); |
| + int j; |
| |
| + for (j = this.points.size() - 1; j >= 0; j--) { |
| + PointLatLon tPoint = new PointLatLon(this.points.get(j).getLat(), this.points.get(j).getLon()); |
| + newPoints.add(tPoint); |
| + } |
| + |
| + this.points.clear(); |
| + this.points = newPoints; |
| + } |
| + |
| + public Boolean makeESRIRotation(ESRIContourType contourType) { |
| + Boolean ret_val = false; |
| + if (this.isValid()) { |
| + if (((contourType == ESRIContourType.outer) && (this.myRotation == ESRIContourType.inner)) |
| + || ((contourType == ESRIContourType.inner) && (this.myRotation == ESRIContourType.outer))) { |
| + this.swapRotation(); |
| + } |
| + ret_val = true; |
| + } |
| + |
| + return ret_val; |
| + } |
| + |
| + protected void getRotation() { |
| + double contour_area = 0.0; |
| + int j; |
| + PointLatLon a, b; |
| + |
| + this.myRotation = ESRIContourType.unknown; |
| + |
| + if (this.bValid) { |
| + |
| + // Calculate cartesian area...test for positive or negative value. This tells the rotation of points CW versus CCW. |
| + // NOTE: Don't use this method to calc "real" areas of Lat/Lon! This is just a fast way of finding out the order of points. |
| + // Lat/Lon must be projected first to get actual area using this type of cross-product method. |
| + if (this.points.size() > 2) { |
| + for (j = 0; j < this.points.size() - 2; j++) { |
| + a = this.points.get(j); |
| + b = this.points.get(j + 1); |
| + |
| + contour_area += a.getLon() * b.getLat() - b.getLon() * a.getLat(); |
| + } |
| + a = this.points.get(j); |
| + b = this.points.get(0); |
| + contour_area += a.getLon() * b.getLat() - b.getLon() * a.getLat(); |
| + |
| + if (contour_area < 0) { |
| + this.myRotation = ESRIContourType.inner; //CCW |
| + } else { |
| + this.myRotation = ESRIContourType.outer; //CW |
| + } |
| + } |
| + } |
| + } |
| + |
| public static class PointLatLon { |
| |
| private Double Lat; |
| @@ -308,7 +374,7 @@ |
| } |
| } |
| |
| - public Boolean isValid() { |
| + public Boolean isValid() { |
| return this.bValid; |
| } |
| |