[reportlab-users] Problem creating a custom Drawing Flowable to use with RML

[Ray Côté]

Found the solution.

    def draw(self) -> None:
        """Draw the chart."""
        renderPDF.draw(self.drawing, self.canv, 0, 0)

I'll write the full implementation up as a Gist.

On Tue, Jun 20, 2023 at 9:22 AM Ray Côté <ray+rl at appropriatesolutions.com>
wrote:

> I'm trying to create an SVG Flowable to use as a plugInFlowable with RML.
> I've looked at several online examples and they all show how to add the
> Diagram when generating the report directly with Python code.
>
> My RML template contains the following:
>         <plugInFlowable module="path.to.charts"
> function="chart">xyx</plugInFlowable>
>
> When I try to draw the Flowable using the following class I get an error
> that the Drawing does not contain a canv. There's a self.canv object that
> has various draw commands (drawImage, drawString, etc.) but none of them
> draw a Drawing object.
>
> I appreciate any guidance as to what the draw function should be doing.
> --Ray
>
> class SvgFlowable(Flowable):
>     """Convert stream containing SVG instructions to a Reportlab
> flowable."""
>
>     def __init__(self, svg: BytesIO) -> None:
>         """Convert SVG to RML drawing on initialization."""
>         svg.seek(0)
>         self.drawing: Drawing = svg2rlg(svg) # Convert SVG to Drawing
>         self.width: int = self.drawing.minWidth()
>         self.height: int = self.drawing.height
>         self.drawing._showBoundary = True
>
>     def wrap(self, *args):
>         return (self.width, self.height)
>
>     def draw(self) -> "Drawing":
>         """Draw the chart."""
>        self.drawing.draw().  # Error
>
> ###
>
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