# author: mario#include-once:org
#
# Allows to add trivial <animate> tags to a SVG document. Embedded animations
# work for standalone SVG graphics. Some instructions are understood by the
# GIF interpolation in ★export_gif (which this was originally intended for).
#
# Usually requires selecting one object/shape/path, invoking the module in
# Extension➜Animation➜Animate-Yo, and activating one of the tabs to inject an
# <animate*> tag.  The [move] option additionally requires a selected path
# (second argument) from transitioning the main object on.
#
# More timing attributes:
#  · fill, end, min, max, restart, repeatDur,
#  · calcMode, values, by
#  · keyTimes, keyPoints, keySplines

            "type": self.options.mode, # scale
            "from": "1.0 1.0",
            "to": self.options.scale,
        }

    def translate(self):
        """ <animateTransform attributeName=transform to=translate(20 30 50)> """
        nums = re.findall(r"(-?\d+(?:\.\d+)?)", self.options.translate)
        if len(nums) == 6:
            func = "matrix"
        elif len(nums) == 2:
            func = "translate"
        else:
            raise AbortExtension(f"Requires either two params for translate(x y) or six for matrix(a b c d e f) - received '{nums}'")
        return AnimateTransform,  {
            "attributeName": "transform",
            "attributeType": "XML",
            "type": func, # translate / matrix
            #"from": "0 0",
            "to": " ".join(nums),
        }

    def rotate(self):
        """ <animateTransform attributeName=transform to=rotate(360)> """
        if re.search(r"rotate\(.*\)", self.has_transform):
            raise AbortExtension("Can't realistically calculate center point with pre-existing rotation.")
            # obj.transform-origin=center ?

            "attributeName": "transform",
            "attributeType": "XML",
            "type": "skewX" if self.options.skew_x else "skewY",
            #"from": "0",
            "to": self.options.skew_x or self.options.skew_y,
        }

    def attrib(self):
        """ <animate attributeName=width to=20px> """
        return Animate, {
            "attributeName": self.options.attr_name,
            "attributeType": "auto", # XML
            "from": self.options.attr_from,
            "to": self.options.attr_to,
        }