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Adding methods for getting geodesic measures from geometries. Assuming geometries can be transformed into Geographic/WGS84, getGeodesicLength and getGeodesicArea should return reasonable 'on the ground' metrics. Use getLength and getArea for the planar metrics. r=crschmidt (closes #1819)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@9248 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2009-04-08 23:12:24 +00:00
parent 5f335f4207
commit 08077f0f42
8 changed files with 250 additions and 44 deletions
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23
tests/Geometry/LineString.html
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@@ -351,7 +351,30 @@
"clone() creates an OpenLayers.Geometry.LineString");
t.ok(geometry.equals(clone), "clone has equivalent coordinates");
}
function test_getGeodesicLength(t) {
// expected values from http://www.movable-type.co.uk/scripts/latlong-vincenty.html
var cases = [{
wkt: "LINESTRING(0 0, -10 45)",
exp: 5081689.690
}, {
wkt: "LINESTRING(-10 45, 0 0)",
exp: 5081689.690
}, {
wkt: "LINESTRING(0 0, -10 45, -20 50)",
exp: 5081689.690 + 935018.062
}];
t.plan(cases.length);
var geom, got;
for(var i=0; i<cases.length; ++i) {
geom = new OpenLayers.Geometry.fromWKT(cases[i].wkt);
got = geom.getGeodesicLength();
t.eq(Math.round(got), Math.round(cases[i].exp), "[case " + i + "] length calculated");
}
}
</script>
</head>