Compound Transforms
Compound Transforms are a special sort of transform. They are
defined by the user and are composed of other transforms. They
are useful for tidying up complex flow diagrams and will be usable
(eventually, ahem). We shall create a compound transform.
First we set up our inputs and outputs:
Now add a compound transform. Right click the mouse and choose 'Compound Transform/ New Compound Transform'.
If you double click on the compound transform, it will open up a new diagram. It has little in it yet:
So we will create an input. Right click the mouse and create an
input. I called mine 'video'. This is not an external input, but
input coming from the parent diagram. For now just connect the
input to the output:
Now double click on some unused space to close the diagram and we are
returned to the parent diagram. Drag the output from the
MpgFileSource to the custom transform, and you will be given a
choice. You can either connect to the 'video' input or create a
new input. For now connect to the video input (the first menu
option). Connect the output from the compound transform to the
final output:
You can double-click on flow2 to see that the video is flowing through
the transform. Let us make things more interesting though.
We can create an input in another way. First rename the output
from the Blank Source. I renamed mine 'blank'. Now when you
drag the flow to the compound transform it offers to create an input
called 'blank' to match the flow name. Accept this and your
diagram looks like this:
Now double click to open the compound transform, and you will see your
new input ready to use. We shall do a simple dissolve of the two
inputs:
You can run the flow(flow5) to check the result, or you can pop back out of the transform and run the flow in the parent diagram.