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AB had some significant improvements and leaps recently in
its plotting capabilities.
I would separate plot layer from plot order. Each of them
has a different purpose and use.
By plot order I mean which plotted entity covers the ones
underneath, currently set by location of the command in the
afl code. I would prefer a "hierarchy" number assigned to
each instead.
I would like to see full control of plot order for EACH plot
command including Gfx low level plots (I believe that
currently you can have ALL Gfx plot either on top or below
other graphics but not individually controlled).
This would enable keeping the location of plot command in a
logical order where they belong and not force moving all
plot commands out of their individual sections to the bottom
of the code, and sorting them based on the desired visual
plot effects. It would also allow optimizing for execution
speed by separating fixed labels from continuously changing
values, or values that change only at new bars.
Full control of plot layer for each plot command is also
desired.
Joseph Biran
____________________________________________
-----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Dennis Brown
Sent: Thursday, March 20, 2008 6:01 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] GFX and Plotting in Layers in AB
Hello,
Herman is doing us all a great service with his UKB posts
about
overlay plotting using GFX functions, creating button like
functions,
and chart trading. Thank you Herman!
I have given a lot of thought about the plotting features of
AB and
how to best use those capabilities in my charts. I have
also run into
a number of situations that I could not figure out how to do
it.
Looking over the AB suggestions list, many are related to
increasing
the capabilities of plotting functions. When Tomasz
released the GFX
low level plotting functions and recently (beta) some
additional mouse
functions, many more possibilities opened up. Thank you
Tomasz!
Now, I am trying to take stock of where I am at relative to
things I
have wanted to do for a long time. Perhaps a few more
functions are
needed to realize these, or perhaps there is already a way
to do what
I want. Here are some of the things I would like to do.
Please
comment on any of them --especially if you know a way to do
them now
or can think of a better approach as a suggestion. I am
also sounding
out my understanding of this area, so please correct me
where I have a
misconception.
Plotting from AFL on GFX layers:
So far, the only way I know of to plot on layers from AFL,
other than
the default chart layer is using the PlotShapes() function.
The
layers seem to be only used for manual study plots. Layers
are locked
in step with the time scale of the chart, so they align and
scroll
with the chart. Layers do not erase their plots except by
manual
command. I suppose that the ability for PlotShapes() to
plot on
layers, is so that AFL can interact with manual cursor
selections to
mark certain events on the chart permanently. One
suggestion I saw
was for a drag and drop symbol pallet to manually place
these.
The GFX functions plot to special GFX only layers
--Currently we have
one layer above the chart plots and one layer below the
chart plots.
These GFX layers are pixel oriented, and are not aligned to
the chart
time scale.
What I would like to be able to do is:
1. Plot with GFX functions to a layer above all other
layers
(Foreground) and a layer below all other layers and the
chart layer
(Background).
2. GFX plots to each layer should remember their plots
between AFL
passes and only clear a layer when plotting first time again
in a new
AFL pass.
3. GFX plots should not cause the chart plots to clear.
Why would I like these?
First, I currently generate some informational cell and
button plots
with GFX functions. I can plot them above the chart, but
not above
the other layers that have my tend lines, etc. This creates
problems
reading the text in the cell or button, and potential
problems
selecting line elements running over the buttons. Even if
future
versions of AB allow more control over the chart area so
there is more
room for these informational displays, the regular layers
still
currently cover more than the chart plot area. Herman has
shown us
how to create essentially pull down buttons running along
the top of
the chart. These buttons need to be plotted above
everything else for
a clean interface.
Second, I can speed up my AFL processing (and I do a lot of
processing), if I am able to only recalculate (and re-plot)
on a new
bar (re-plotting the last bar only in a GFX layer).
However, I still
want to plot and interact with the GFX layer buttons in the
mean time.
Plotting order for normal chart plots:
Something that is on the AB to do list is having more direct
control
over the plot order in charts. The difficulties of this
have been
discussed before on this list. One possible strategy is to
extend
this idea of the GFX plot layers to a more general case.
For instance
if there were 8 or 16 layers that could be specified for the
target of
a plot. Within a layer, the plots would operate the same as
currently
is the case. However, selecting a different layer would
result in the
ability to plot above or below a previous plot command
without regard
to its placement in the AFL formula.
One AFL command could serve for selecting the plot layer for
subsequent plot or GFX commands (internally they do not have
to be the
same layer). For example: PlotLayer(5); Plot(...);
The nice thing about this approach is that it would be
completely
backwards compatible with the default layer.
Please offer your insights.
Can you think of other uses for this approach?
Do you have a different approach that would work?
Best regards,
Dennis
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