d3.geoTransform(methods)
Defines an arbitrary transform using the methods defined on the specified methods object. Any undefined methods will use pass-through methods that propagate inputs to the output stream. For example, to reflect the y-dimension (see also identity.reflectY):
var reflectY = d3.geoTransform({
point: function(x, y) {
this.stream.point(x, -y);
}
});
Or to define an affine matrix transformation:
function matrix(a, b, c, d, tx, ty) {
return d3.geoTransform({
poin
