transform property

GeoTransform? get transform

A transform applied to any input geometry before it is rendered.

final path = GeoPath()..transform = geoAlbers();

path.projection() // a geoAlbers instance

The null transform represents the identity transformation: the input geometry is not transformed and is instead rendered directly in raw coordinates. This can be useful for fast rendering of pre-projected geometry, or for fast rendering of the equirectangular projection.

The given transform is typically one of D4’s built-in geographic projections; however, any object that implements GeoTransform can be used, enabling the use of custom projections. See GeoTransform.new for more examples of arbitrary geometric transformations.

Implementation

GeoTransform? get transform => _transform;

set transform (GeoTransform? transform)

Implementation

set transform(GeoTransform? transform) {
  if (transform == null) {
    _transform = null;
    _transformStream = identity;
  } else {
    _transformStream = (_transform = transform).stream;
  }
}