Hi there,
I've implementing a "zoom area" tool on a QGraphicsView, while dragging
the mouse it draws the zoom area in a (visually) similar way as the
RubberBandDrag selection area. I've looked into the source code of
QGraphicsView but couldn't find which color is used to draw it.
I've pinned do
I am trying to install Qt 5.3 Beta for MSVC either 2010 or 2012. However, I
end up with a single entry in Control Panel\Programs\Programs and Features
list. I guess, I will have to uninstall the later one manually. Is that
enough? Anyway, I'd like them to be distinguished (at least, let the entry
n
Hi,
i'm wrote this post https://qt-project.org/forums/viewthread/40244/, i
don't found a solution yet.
Has someone a solution?
I'm using 5.3 beta, and i think that the catch oh windowstate should to be
a "must".
BR
Nicola
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On 03/26/2014 10:04 AM, André Somers wrote:
> william.croc...@analog.com schreef op 26-3-2014 14:56:
>>> I too have a similar requirements for monotonic data plots. How do you
>>> store the full million points data?
>> QVector x, y;
> Is that really the quickest? This means that points have to be
william.croc...@analog.com schreef op 26-3-2014 14:56:
>> I too have a similar requirements for monotonic data plots. How do you
>> store the full million points data?
> QVector x, y;
Is that really the quickest? This means that points have to be fetched
from two different memory locations all the
>
> I too have a similar requirements for monotonic data plots. How do you
> store the full million points data?
QVector x, y;
>Do you keep all points in memory so
> that it is readily available when the user zooms?
>
Yes.
Bill
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>
> However as others have already pointed out "with the usual tricks"
> (Clever Clipping(tm), Level of Detail, ...) today's CPUs should also be
>able to render lines with several thousands of segments...
>
I though I was done until I tried to send something to a printer.
What works on the screen
Am 26.03.2014 um 13:32 schrieb Rayner Pupo :
> maybe using shaders you can boost you representation
In modern OpenGL (read: anything >= OpenGL 3) "shaders" are not an "optional
thing to boost performance", they are a necessity to "get things going" in the
first place ;)
So your advise must rea
On Wednesday 26 March 2014 10:35:05 Graham Labdon wrote:
> Hi
> My application needs to display a series of 'traces'.
> Each trace will consist of 5000+ points and there can be up to 50 traces.
> I would be grateful of some pointers on how to do this in the most efficient
> way - QPainter on a widg
On 03/26/2014 04:43 PM, william.croc...@analog.com wrote:
>
> Create trace abstracts (with reduced point counts) for the purposes of
> drawing.
> In the extreme case, if a trace is close enough to a straight line (given
> the resolution of the display) the trace could be abstracted as 2 points.
>
maybe using shaders you can boost you representation
I Conferencia CientÃfica Internacional UCIENCIA 2014 en la UCI del 24 al 26 de
abril de 2014, La Habana, Cuba. Ver http://uciencia.uci.cu
_
On 03/26/2014 06:35 AM, Graham Labdon wrote:
> Hi
> My application needs to display a series of 'traces'.
> Each trace will consist of 5000+ points and there can be up to 50 traces.
> I would be grateful of some pointers on how to do this in the most efficient
> way -
> QPainter on a widget
> Use
Hi
My application needs to display a series of 'traces'.
Each trace will consist of 5000+ points and there can be up to 50 traces.
I would be grateful of some pointers on how to do this in the most efficient
way -
QPainter on a widget
Use of OpenGL
QGraphicsScene
Which of these will be the most ef
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