code: def color_gradient(
      size,
      p1,
      p2=None,
      vector=None,
      radius=None,
      color_1=0.0,
      color_2=1.0,
      shape="linear",
      offset=0,
  ):
      """Draw a linear, bilinear, or radial gradient.
  
      The result is a picture of size ``size``, whose color varies
      gradually from color `color_1` in position ``p1`` to color ``color_2``
      in position ``p2``.
  
      If it is a RGB picture the result must be transformed into
      a 'uint8' array to be displayed normally:
  
      Parameters
      ----------
  
      size : tuple or list
          Size (width, height) in pixels of the final image array.
  
      p1 : tuple or list
         Position for the first coordinate of the gradient in pixels (x, y).
         The color 'before' ``p1`` is ``color_1`` and it gradually changes in
         the direction of ``p2`` until it is ``color_2`` when it reaches ``p2``.
  
      p2 : tuple or list, optional
         Position for the second coordinate of the gradient in pixels (x, y).
          Coordinates (x, y)  of the limit point for ``color_1``
          and ``color_2``.
  
      vector : tuple or list, optional
          A vector (x, y) in pixels that can be provided instead of ``p2``.
          ``p2`` is then defined as (p1 + vector).
  
      color_1 : tuple or list, optional
          Starting color for the gradient. As default, black. Either floats
          between 0 and 1 (for gradients used in masks) or [R, G, B] arrays
          (for colored gradients).
  
      color_2 : tuple or list, optional
          Color for the second point in the gradient. As default, white. Either
          floats between 0 and 1 (for gradients used in masks) or [R, G, B]
          arrays (for colored gradients).
  
      shape : str, optional
          Shape of the gradient. Can be either ``"linear"``, ``"bilinear"`` or
          ``"circular"``. In a linear gradient the color varies in one direction,
          from point ``p1`` to point ``p2``. In a bilinear gradient it also
          varies symmetrically from ``p1`` in the other direction. In a circular
          gradient it goes from ``color_1`` to ``color_2`` in all directions.
  
      radius : float, optional
          If ``shape="radial"``, the radius of the gradient is defined with the
          parameter ``radius``, in pixels.
  
      offset : float, optional
          Real number between 0 and 1 indicating the fraction of the vector
          at which the gradient actually starts. For instance if ``offset``
          is 0.9 in a gradient going from p1 to p2, then the gradient will
          only occur near p2 (before that everything is of color ``color_1``)
          If the offset is 0.9 in a radial gradient, the gradient will
          occur in the region located between 90% and 100% of the radius,
          this creates a blurry disc of radius ``d(p1, p2)``.
  
      Returns
      -------
  
      image
          An Numpy array of dimensions (width, height, n_colors) of type float
          representing the image of the gradient.
  
      Examples
      --------
  
      >>> color_gradient((10, 1), (0, 0), p2=(10, 0))  # from white to black
      [[1.  0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1]]
      >>>
      >>> color_gradient(  # from red to green
      ...     (10, 1),  # size
      ...     (0, 0),   # p1
      ...     p2=(10, 0),
      ...     color_1=(255, 0, 0),  # red
      ...     color_2=(0, 255, 0),  # green
      ... )
      [[[  0.  255.    0. ]
        [ 25.5 229.5   0. ]
        [ 51.  204.    0. ]
        [ 76.5 178.5   0. ]
        [102.  153.    0. ]
        [127.5 127.5   0. ]
        [153.  102.    0. ]
        [178.5  76.5   0. ]
        [204.   51.    0. ]
        [229.5  25.5   0. ]]]
      """
      # np-arrayize and change x,y coordinates to y,x
      w, h = size
  
      color_1 = np.array(color_1).astype(float)
      color_2 = np.array(color_2).astype(float)
  
      if shape == "bilinear":
          if vector is None:
              if p2 is None:
                  raise ValueError(
                      "You must provide either 'p2' or 'vector'"
                  )
              vector = np.array(p2) - np.array(p1)
  
          m1, m2 = [
              color_gradient(
                  size,
                  p1,
                  vector=v,
                  color_1=1.0,
                  color_2=0.0,
                  shape="linear",
                  offset=offset,
              )
              for v in [vector, [-v for v in vector]]
          ]
  
          arr = np.maximum(m1, m2)
          if color_1.size > 1:
              arr = np.dstack(3 * [arr])
          return arr * color_1 + (1 - arr) * color_2
  
      p1 = np.array(p1[::-1]).astype(float)
  
      M = np.dstack(np.meshgrid(range(w), range(h))[::-1]).astype(float)
  
      if shape == "linear":
          if vector is None:
              if p2 is not None:
                  vector = np.array(p2[::-1]) - p1
              else:
                  raise ValueError(
                      "You must provide either 'p2' or 'vector'"
                  )
          else:
              vector = np.array(vector[::-1])
  
          norm = np.linalg.norm(vector)
          n_vec = vector / norm**2  # norm 1/norm(vector)
  
          p1 = p1 + offset * vector
          arr = (M - p1).dot(n_vec) / (1 - offset)
          arr = np.minimum(1, np.maximum(0, arr))
          if color_1.size > 1:
              arr = np.dstack(3 * [arr])
          return arr * color_1 + (1 - arr) * color_2
  
      elif shape == "radial":
          if (radius or 0) == 0:
              arr = np.ones((h, w))
          else:
              arr = (
                  np.sqrt(((M - p1) ** 2).sum(axis=2))
              ) - offset * radius
              arr = arr / ((1 - offset) * radius)
              arr = np.minimum(1.0, np.maximum(0, arr))
  
          if color_1.size > 1:
              arr = np.dstack(3 * [arr])
          return (1 - arr) * color_1 + arr * color_2
      raise ValueError(
          "Invalid shape, should be either 'radial', 'linear' or 'bilinear'"
      )
  
imports: import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: color_gradient(size, p1, p2, vector, radius, color_1, color_2, shape, offset) and returns: unknown, unknown, unknown