Board index » cppbuilder » TChart: BeginUpdate() or similar?

2004-01-03 06:38:43 AM
cppbuilder110
Hi,
I use a TChart with a TLineSeries. During adding several thousand values to
the TLineSeries in a loop, I want the TChart to wait before drawing itself
to save time. My TAdvStringGrid on the same form has BeginUpdate() and
EndUpdate() functions. What do I have to use with the TChart?
Thanks,
Thomas
 

There is a BufferedDisplay property that by default is supposed to be set to true.
From the help file:
BufferedDisplay
This public property controls how Charts are internally drawn. When True, the default,
Charts are drawn into an internal hidden bitmap. When drawing is finished, this
internal bitmap is transferred to the screen in one single operation. The result is
non-flickering animation.
It sounds like it should already be doing what you are talking about.
You may also want to look at
TFastLineSeries
some of the properties are different and there are no methods or events.
On 1/2/2004 4:38 PM Thomas Blankschein spoke thusly

"Thomas Blankschein" < XXXX@XXXXX.COM >wrote:
SendMessage( Chart1->Handle, WM_SETREDRAW, FALSE, 0 );
....
SendMessage( Chart1->Handle, WM_SETREDRAW, TRUE, 0 );
~ JD
 

{smallsort}

"Thomas Blankschein" < XXXX@XXXXX.COM >wrote:
LockWindowUpdate( this->Handle );
....
LockWindowUpdate( 0 );
~ JD
 

Hi JM,
thanks for your hints.
Thomas
 

Hi JD,
property does internally something similar. Like I already told JM the use
of TFastLineSeries increased the speed. I don't need all those fancy things
from TLineSeries.
Thomas
 

In addition to using TFastLineSeries also set the DrawAllPoints property to
false. This will increase speed dramatically.
You should perhabs also have a look a the AutoRepaint property. I have set i
to false in one of my programs which add a huge amount of points, but can't
remeber if that was speed related thing.
Palle
"Thomas Blankschein" < XXXX@XXXXX.COM >skrev i en meddelelse

Hi,
hint?
Thanks,
Thomas
 

It is a property on the TFastLineSeries. At least in TeeChart 6
professional, which I use. It might not be available in the free TeeChart
version supplied by BCB.
I am using BCB6, but it should not make any difference in this regard.
Palle
"Thomas Blankschein" < XXXX@XXXXX.COM >skrev i en meddelelse