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Tomasz,
Thank you for making it possible for customers like me who use AFL as
a programming language to create trading "platforms". Every time you
add some big or little thing that provides additional AFL flexibility
to control internal functions, I am able to quickly expand my horizons
with how I use AmiBroker.
Yes, I struggled when writing the previous post when I realized that
even though I had been thinking and referring to the Z-order as
"layers" for a long time, that term had already been used in AmiBroker
for visibility layers.
When trying to use only "Z-order", I struggled because, this implies a
verb, and conceptually I wanted to convey the idea of a noun of
positions. It can be visualized both ways -- as outputting plots in
groups with the group order defined by Z-order parameter, or as
implemented where each Z-order refers to a different Z-layer with its
own buffer. I find it much easier to visualize it as different Z-
layers on the chart. I come from a background in CAD and photoshop
type programs where layers refers to Z-layers.
I don't have all the answers, all I can do is provide some feedback
from my experience. I think Z-order is a good term to describe the
"action" parameter of the command, and Z-layers or perhaps Z-levels is
the static "result" of executing the commands. Perhaps someone else
has a better idea about this.
Best regards,
Dennis
On Feb 18, 2009, at 3:38 AM, Tomasz Janeczko wrote:
> Dennis,
>
> Thank you for the feedback. All your findings are correct. It is
> very encouraging seeing new feature being
> fully utilised in such a short time.
> Regarding naming conventions - yes I try to keep the "Z-order" name
> for new z-order feature
> and do not use the word "layer" to avoid mix with old functionality.
> So, I would like to avoid names like z-layer.
>
> In fact the drawing studies (lines/rectangles/elipsses) can use both
> functionalities *independently*.
> The z-order defines the drawing order (above/below), while the layer
> controls visibility (on/off) depending on interval displayed.
> Having two as independent controls was intended and provided for
> maximum flexibility.
>
> If anyone has better ideas on naming conventions, they can be changed.
>
> For me "z-order" name represents actual functionality best. I have
> some doubts regarding "layer" word, because
> this old functionality actually is just visibility switch.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Dennis Brown" <see3d@xxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Wednesday, February 18, 2009 3:01 AM
> Subject: Re: [amibroker] Plot() and z-order
>
>
>> Tomasz,
>>
>> Thanks for all the layers. I have already added them to my charts
>> (which removed a bunch of spaghetti code) and have generically used
>> up
>> all 11 already!
>>
>> Having plot Z-layers makes my AFL much more modular and the includes
>> are more complete.
>>
>> I just want to confirm that Gfx drawings plot above Z-layer 5 and
>> below Z-layer -5. This effectively adds one more Z-layers -- since
>> you can't mix Gfx overlay modes in the same chart.
>>
>> It appears that shapes plot to Z-layer 0 of the specified layer (like
>> intraday layer). Plotting text seems to got to Z-layer 0, as well as
>> drawing text studies. Calling two different things "Layers" may
>> cause
>> confusion, so we all should stick with Z-order or Z-layer to make it
>> clear.
>>
>> For those who might wonder what to use all the Z-layers can be used
>> for, here is an example of how I apportioned them on my charts for
>> now
>> --all are used (and I could even use a few more):
>>
>> -6 Gfx mode 1 (I do not use)
>> -5 Bg fill area 1 (used for multiple overlapping bands layer settable
>> in each indicator)
>> -4 Bg fill area 2
>> -3 Bg fill area 3
>> -2 Bg fill area 4
>> -1 Ovals/Rectangles manual chart highlighting (default setting)
>> 0 Study lines (default setting), PlotText(), PlotShapes()
>> +1 Upper chart Volume bars, Middle chart Volume bars, Trade equity
>> histograms & lines
>> +2 Under price bar shadow areas
>> +3 Price bars/lines, -- stops & limits (plot under)
>> +4 Signal Ribbon displays at bottom of chart
>> +5 Lower overlapped Volume bars and Volume indicators, Volume and
>> signal Ribbon grid lines
>> +6 Gfx mode 0 (8 pseudo "Z-layers" of Gfx button arrays)
>>
>> The beauty of Z-layers is that the calculation order is decoupled
>> from
>> the plot order.
>>
>> The Gfx drawings do not have Z-order. It would be nice to have them,
>> but since my Gfx buttons can all be drawn at the end of the AFL, it
>> is
>> inconvenient, but not too difficult to arrange for the fact that the
>> detection order and the drawing order are reversed. It just means
>> that it is not completely modular with includes, and a bit error
>> prone
>> from manual editing. I can live with it though.
>>
>> This is a major milestone for my charts.
>>
>> Best regards,
>> Dennis
>>
>> On Feb 15, 2009, at 4:12 AM, Tomasz Janeczko wrote:
>>
>>> Hello,
>>>
>>> With regard to 5.21.0 BETA new functionality
>>> "Plot, PlotForeign and PlotOHLC now have new parameter zorder which
>>> defines the Z-axis position of given plot. (FC#257)"
>>>
>>> It works correctly for PlotOHLC and PlotForeign.
>>> For Plot() function, the XShift parameter is incorrectly used as z-
>>> order.
>>> This will be fixed in 5.22.
>>>
>>> So if you need z-ordering for Plot(), please use PlotOHLC instead
>>> until 5.22 comes up.
>>>
>>> Thanks to Dennis for reporting this.
>>>
>>> Best regards,
>>> Tomasz Janeczko
>>> amibroker.com
>>
>>
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