[Qt-qml] How to animate a sequence of png images

[Andrew.Ratcliff at nokia.com]

Hi Michael

Hadn't come across mng format before but that has done the trick thanks.

FYI to make mng format from transparent png files:
http://social.msdn.microsoft.com/Forums/en-US/hddvd/thread/90c3d6de-2613-4372-84fd-b1921c45a6d5

I found that using ImageMagick was the least painless of several programs I tried.  You can download it at http://www.imagemagick.org/.

First, navigate to the ImageMagick folder via the command prompt and then to convert PNGs to MNGs type:

convert -delay 10 "<path to PNGs>*.png" "<path to put MNG>\<MNG Name>.mng"

The delay there adds a delay between frames so the animations aren't as fast.  It's an optional flag.  Also, if you're using PNGs with transparent backgrounds, try doing:

convert -delay 10 -dispose 2 "<path to PNGs>*.png" "<path to put MNG>\<MNG Name>.mng"

The dispose flag does the following:

  Undefined    0   No disposal specified (usually equivalent to 'none').
  None         1   Do not dispose between frames. Just layer the next frame.
  Background   2   Overwrite the frames area with the background color.
  Previous     3   Overwrite the frames area with what was there prior to overlaying.
Cheers
Andy



From: Brasser Michael (Nokia-MS-Qt/Brisbane)
Sent: 09 September, 2010 10:11
To: Ratcliff Andrew (Nokia-MS/Oulu)
Cc: Qt-qml at trolltech.com
Subject: Re: [Qt-qml] How to animate a sequence of png images

AnimatedImage provides support for mng and animated gifs, if either of those is an option for you.

Regards,
Michael

On 09/09/2010, at 4:12 PM, ext Andrew.Ratcliff at nokia.com<mailto:Andrew.Ratcliff at nokia.com> wrote:


Hi all,

What is the best way to animate a looping sequence of 30 or so transparent png images in QML?

Cheers
Andy

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