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Add support for transformation functions without using proj4js, and make

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the SphericalMercator mixin register two transformations to/from EPSG:900913,
EPSG:4326. Thanks to Tim for the feedback and review. (Closes #1210)

This allows us to transform points to/from SphericalMercator 
without proj4js support -- and if other projects need similar functionality, 
they can write their own custom transformation functions rather than 
modifying proj4js to support some custom projection.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@5410 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2007-12-14 20:45:42 +00:00
parent 9dd5d0e6da
commit a170e3fdf6
6 changed files with 158 additions and 12 deletions
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tests/Layer/test_SphericalMercator.html
+48 -3
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@@ -1,9 +1,8 @@
<html>
<head>
<!-- this gmaps key generated for http://openlayers.org/dev/ -->
<script src="../../lib/OpenLayers.js"></script>
<script type="text/javascript">
function test_SphericalMercator_forwardProject(t) {
function test_SphericalMercator_forwardMercator(t) {
t.plan(12);
var arctic = OpenLayers.Layer.SphericalMercator.forwardMercator(0, 85);
var antarctic = OpenLayers.Layer.SphericalMercator.forwardMercator(0, -85);
@@ -32,7 +31,7 @@
t.eq(sw.lon, -20037508.34, "SW lon is correct");
}
function test_sphericalMercator_inverseProject(t) {
function test_sphericalMercator_inverseMercator(t) {
t.plan(4);
var sw = OpenLayers.Layer.SphericalMercator.inverseMercator(-20037508.34, -20037508.34);
var ne = OpenLayers.Layer.SphericalMercator.inverseMercator(20037508.34, 20037508.34);
@@ -42,6 +41,52 @@
t.eq(sw.lat, -85.05112877980659, "Southwest lat correct");
t.eq(ne.lat, 85.05112877980660, "Northeast lat correct");
}
function strToFixed(str, dig) {
if(dig == undefined) {
dig = 5;
}
return str.replace(/(\d+\.\d+)/g, function(match) {
return parseFloat(match).toFixed(dig);
});
}
function test_SphericalMercator_projectForward(t) {
t.plan(1);
var point = new OpenLayers.Geometry.Point(10, 20);
OpenLayers.Layer.SphericalMercator.projectForward(point);
t.eq(strToFixed(point.toString()),
strToFixed("POINT(1113194.9077777779 2273030.9266712805)"),
"point transforms from EPSG:4326 to Spherical Mercator");
}
function test_SphericalMercator_to4326(t) {
t.plan(1);
var point = new OpenLayers.Geometry.Point(1113195, 2273031);
OpenLayers.Layer.SphericalMercator.projectInverse(point);
t.eq(strToFixed(point.toString()),
strToFixed("POINT(10.000000828446318 20.000000618997227)"),
"point transforms from EPSG:4326 to Spherical Mercator");
}
function test_SphericalMercator_addTransform(t) {
// this class should add two methods to the
// OpenLayers.Projection.transforms object
t.plan(4);
var wgs84 = OpenLayers.Projection.transforms["EPSG:4326"];
t.ok(wgs84 instanceof Object, "EPSG:4326 exists in table");
var smerc = OpenLayers.Projection.transforms["EPSG:900913"];
t.ok(smerc instanceof Object, "EPSG:900913 exists in table");
t.ok(wgs84["EPSG:900913"] === OpenLayers.Layer.SphericalMercator.projectForward,
"from EPSG:4326 to EPSG:900913 correctly defined");
t.ok(smerc["EPSG:4326"] === OpenLayers.Layer.SphericalMercator.projectInverse,
"from EPSG:900913 to EPSG:4326 correctly defined");
}
</script>
</head>