Import Upstream version 1.9.0

1 files changed, 27 insertions, 0 deletions

diff --git a/src/projection/transverseMercator.js b/src/projection/transverseMercator.js
new file mode 100644
index 0000000..822a3a4
--- /dev/null
+++ b/src/projection/transverseMercator.js
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+import {atan, exp, halfPi, log, tan} from "../math";
+import {mercatorProjection} from "./mercator";
+
+export function transverseMercatorRaw(lambda, phi) {
+  return [log(tan((halfPi + phi) / 2)), -lambda];
+}
+
+transverseMercatorRaw.invert = function(x, y) {
+  return [-y, 2 * atan(exp(x)) - halfPi];
+};
+
+export default function() {
+  var m = mercatorProjection(transverseMercatorRaw),
+      center = m.center,
+      rotate = m.rotate;
+
+  m.center = function(_) {
+    return arguments.length ? center([-_[1], _[0]]) : (_ = center(), [_[1], -_[0]]);
+  };
+
+  m.rotate = function(_) {
+    return arguments.length ? rotate([_[0], _[1], _.length > 2 ? _[2] + 90 : 90]) : (_ = rotate(), [_[0], _[1], _[2] - 90]);
+  };
+
+  return rotate([0, 0, 90])
+      .scale(159.155);
+}