code: func (g *GeoM) Apply(x, y float64) (float64, float64) {
  	x2, y2 := g.apply32(float32(x), float32(y))
  	return float64(x2), float64(y2)
  }
docs: // Apply pre-multiplies a vector (x, y, 1) by the matrix.
  // In other words, Apply calculates GeoM * (x, y, 1)^T.
  // The return value is x and y values of the result vector.