projection.fitExtent()

projection.fitExtent(extent, object)

Sets the projection’s scale and translate to fit the specified GeoJSON object in the center of the given extent. The extent is specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left side of the bounding box, y₀ is the top, x₁ is the right and y₁ is the bottom. Returns the projection.

For example, to scale and translate the New Jersey State Plane projection to fit a GeoJSON object nj in the center of a 960×500 bounding box with 20 pixels of padding on each side:

var projection = d3.geoTransverseMercator()
    .rotate([74 + 30 / 60, -38 - 50 / 60])
    .fitExtent([[20, 20], [940, 480]], nj);

Any clip extent is ignored when determining the new scale and translate. The precision used to compute the bounding box of the given object is computed at an effective scale of 150.