Changeset 9063 in josm for trunk/src/org/openstreetmap/josm/tools
 Timestamp:
 20151125T09:54:02+01:00 (5 years ago)
 File:

 1 edited
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trunk/src/org/openstreetmap/josm/tools/Geometry.java
r9062 r9063 951 951 return false; 952 952 } 953 954 /** 955 * Data class to hold two double values (area and perimeter of a polygon). 956 */ 957 public static class AreaAndPerimeter { 958 private final double area; 959 private final double perimeter; 960 961 public AreaAndPerimeter(double area, double perimeter) { 962 this.area = area; 963 this.perimeter = perimeter; 964 } 965 966 public double getArea() { 967 return area; 968 } 969 970 public double getPerimeter() { 971 return perimeter; 972 } 973 } 974 975 /** 976 * Calculate area and perimeter length of a polygon. 977 * 978 * Uses current projection; units are that of the projected coordinates. 979 * 980 * @param nodes the list of nodes representing the polygon (must be 981 * closed, i.e. first node equals last node) 982 * @return area and perimeter 983 */ 984 public static AreaAndPerimeter getAreaAndPerimeter(List<Node> nodes) { 985 if (nodes.get(0) != nodes.get(nodes.size()  1)) { 986 throw new IllegalArgumentException(); 987 } 988 double area = 0; 989 double perimeter = 0; 990 Node lastN = null; 991 for (Node n : nodes) { 992 if (lastN != null) { 993 EastNorth p1 = lastN.getEastNorth(); 994 EastNorth p2 = n.getEastNorth(); 995 area += p1.east() * p2.north()  p2.east() * p1.north(); 996 perimeter += p1.distance(p2); 997 } 998 lastN = n; 999 } 1000 return new AreaAndPerimeter(Math.abs(area) / 2, perimeter); 1001 } 953 1002 }
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