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Hello,
See also the very last sample in the User's
Guide:
It shows how to find out what visible bars are and how to
align
lowlevel gfx with normal chart.
See also the following sample from ReleaseNotes.html
document
function GetVisibleBarCount()
{
lvb
= Status("lastvisiblebar");
fvb = Status("firstvisiblebar");
return Min( Lvb - fvb, BarCount - fvb );
}
function GfxConvertBarToPixelX( bar )
{
lvb = Status("lastvisiblebar");
fvb = Status("firstvisiblebar");
pxchartleft = Status("pxchartleft");
pxchartwidth = Status("pxchartwidth");
return pxchartleft +
bar * pxchartwidth / ( Lvb - fvb + 1 );
}
function GfxConvertValueToPixelY( Value )
{
local Miny, Maxy, pxchartbottom,
pxchartheight;
Miny = Status("axisminy");
Maxy = Status("axismaxy");
pxchartbottom =
Status("pxchartbottom");
pxchartheight = Status("pxchartheight");
return pxchartbottom -
floor( 0.5 + (
Value - Miny ) * pxchartheight/ ( Maxy - Miny ) );
}
Plot(C,
"Price", colorBlack, styleHistogram );
GfxSetOverlayMode(0);
GfxSelectSolidBrush(
colorRed );
GfxSelectPen( colorRed );
AllVisibleBars = GetVisibleBarCount();
fvb =
Status("firstvisiblebar");
for( i = 0; i < AllVisibleBars ; i++ )
{
x = GfxConvertBarToPixelX( i );
y =
GfxConvertValueToPixelY( C[ i + fvb ] );
GfxRectangle( x-1,
y-1, x + 2, y+1 );
}
//SetChartBkGradientFill(
ColorRGB(200,200,200), ColorRGB( 255,255,255) );
_SECTION_END();
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Monday, March 30, 2009 11:18 AM
Subject: Re: [amibroker] Re: How do you find the number of
padded bars that are visible?
> It is described in detail
in the Knowledge Base:
> http://www.amibroker.com/kb/2008/07/03/quickafl/
>
> (pay special attention to the PICTURE embedded in the
article)
>
> Best regards,
> Tomasz Janeczko
>
amibroker.com
> ----- Original Message -----
> From: "sidhartha70"
<sidhartha70@xxxxxxxxx>
> To:
<amibroker@xxxxxxxxxxxxxxx>
> Sent:
Monday, March 30, 2009 12:13 AM
> Subject: [amibroker] Re: How do you find
the number of padded bars that are visible?
>
>
>> If
your talking about built in AFL functions like PlotOHLC() etc then they have
built in abilities to plot beyond the end of the
>> last bar... so
wondering about how much space in there is not something you have to worry
about.
>>
>> If it's low level gfx, then I'm not sure I can
help. I do use low level gfx quite a bit but it is either 'on or off' my
chart... I
>> tend to use it for display buttons & grids
etc..etc...
>>
>> There may well be a way to get back the info
you want... maybe someone else can point you in the right
direction...?
>>
>> As a point of note Conrad, I wouldn't
worry so much about code speed right now... my advice is to get down what you
want, then
>> worry about removing any superfluous calculation
afterwards...
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "sidhartha70"
<sidhartha70@xxx> wrote:
>>>
>>> Just to be clear
Conrad, you are talking about low level gfx drawing operations....? Rather than
those in any way related to the
>>> AFL Plot() PlotOHLC()
etc..etc...?
>>>
>>> --- In amibroker@xxxxxxxxxxxxxxx, "Conrad Joach"
<consolejoker@> wrote:
>>> >
>>> > I'll ask
this question in a totaly different way. Depending on a user's settings, there
is a certain amount of padding on the
>>> > right side of the
chart when the chart is scrolled all the way to the right.
>>>
>
>>> > It could be none, but default is more than none. Mine
is set to 15 bars.
>>> >
>>> > My script would
like to know how many bars of padding are visible on the chart. For instance if
the default is 15, and the user
>>> > hasn't moved the scroll
bar, then there are 15 bars of space that I would like to plot some data
in.
>>> >
>>> > But if the user has scrolled just
a bit, there may be only 7 blank bars left on the right, and I want to plot here
just those 7
>>> > bars. If I plot more than 7, I am going to
draw into the right hand price axis, plus waste resources.
>>>
>
>>> > It may be that when the user scrolls back in time,
they see 0 bars. I would like to know not to plot anything beyond the bars
>>> > that are visible.
>>> >
>>>
> So how can one find this out?
>>>
>
>>>
>>
>>
>>
>>
>>
------------------------------------
>>
>> **** IMPORTANT
PLEASE READ ****
>> This group is for the discussion between users
only.
>> This is *NOT* technical support
channel.
>>
>> TO GET TECHNICAL SUPPORT send an e-mail
directly to
>> SUPPORT {at} amibroker.com
>>
>> TO
SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
>> http://www.amibroker.com/feedback/
>>
(submissions sent via other channels won't be
considered)
>>
>> For NEW RELEASE ANNOUNCEMENTS and other news
always check DEVLOG:
>> http://www.amibroker.com/devlog/
>>
>> Yahoo! Groups
Links
>>
>>
>>
>
>
>
>
------------------------------------
>
> **** IMPORTANT PLEASE READ
****
> This group is for the discussion between users only.
> This
is *NOT* technical support channel.
>
> TO GET TECHNICAL SUPPORT
send an e-mail directly to
> SUPPORT {at} amibroker.com
>
>
TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> http://www.amibroker.com/feedback/
>
(submissions sent via other channels won't be considered)
>
> For
NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
>
Yahoo! Groups Links
>
> <*> To visit your group on the web,
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>
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>
__._,_.___
**** IMPORTANT PLEASE READ ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
TO GET TECHNICAL SUPPORT send an e-mail directly to
SUPPORT {at} amibroker.com
TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
http://www.amibroker.com/feedback/
(submissions sent via other channels won't be considered)
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
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__,_._,___
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