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Of course they resort to: "This is the same as making "layers" of
objects where the Z-order determines what object is on top of
another." in order to help the reader visualize it.
Another word that was referenced was Planes. Also Depth Buffers, and
Z-buffers relate to 3D methods. Also it seams that "layers" as a term
is used for just about everything as a concept of hierarchy in
software, so I am ready to back away from that. Z-order is more
widely used in windows programming due to what MS called it.
The Z-order of plots has always been there based on the order of
execution of AFL (forward or reverse). Now we have this new idea of Z-
order that is based on discrete numbered planes or buffers that also
have their own independent Z-order based on the previous sentence.
Ok, this will be my humble suggestion for the plot planes: Z-planes.
I can visualize that. Each Z-plane can have the Z-order of plots as
forward or reversed as before.
I am done commenting on this subject now. I will use whatever is
decided by Tomasz.
Best regards,
Dennis
On Feb 18, 2009, at 2:28 PM, Mike wrote:
> z-order is a pretty standard reference in coding languages, and is
> used as an adjective.
>
> http://en.wikipedia.org/wiki/Z-order
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@xxx> wrote:
>>
>> 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@xxx>
>>> 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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