It is my understanding that the major differences between 4 and 5 are that 5
assumes (and requires) a hardware GL implementation (scenegraph), where 4 does
not. In terms of your coding, his largely comes down to the import statements
that are used.
________________________________
From: BRM <bm_witn...@yahoo.com>
To: Interests Qt <interest@qt-project.org>
Sent: Monday, March 5, 2012 12:39 PM
Subject: [Interest] To QML or not to QML...
I'm working on an application that presently uses Qt 4.7 for a front-end to a
larger system. One of its main tasks is to display data in the system which
requires rendering up to around a thousand or so points and overlaying a
template of the ideal against the actual. Presently it does all the work in a
custom QWidget class and implements the drawing in
QWidget::paintEvent(QPaintEvent *event). However, I am getting ready to do a
major rewrite of this functionality - namely I want to add some text labels,
values, and lines for some of the measurements related to it, and am trying to
determine the best possible path of two that are available.
No matter what I do, there will be some major rework to my application as
things are just changing a lot to do the new functionality I am seeking (can't
be helped).
The below are the options I am aware of:
1. Rework the painting to be done to a QImage/QPixMap/etc, and then use
QGraphScene to display the data, do the overlays, etc.
2. Use QML (Qt Quick 1) similar to #1
3. Use QML (Qt Quick 1) similar to present operation
My main requirements are that I need to be able to update at least a few times
a second (typically 3-5 times a second; possibly higher), and adding the new
text with lines and numbers for the measurements.
As I have not yet touched QML, and there are many on this list who have, what
you recommend?
Would it be worth trying to do this in QML - either #2 or #3 - or should I just
stick to #1?
For those involved with Qt5, will there likely be big changes in the
functionality in moving this to Qt5 when the time comes? I understand (from the
development list) that QML1 is generally easy to port to QML2 but that it
depends on what you do with QML; am I likely to run into a big issue in the
port given what I need to do?
TIA,
Ben
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