On Friday 25 July 2003 14:05, William wrote:
>
> Wouldn't it be quick and easy to read the value of the pixel in
> the QCanvasPixmap at the coordinates of the mouse button double-click.
> If the pixel value is black/blue, then the user has hit a note, a stem or a
> flag,
Or a staff line...
> If the pixel value is non-black/blue (grey/white background), then the user
> has hit the background,
Or very near the note, and we need some kind of threshold.
> Wouldn't this work and be easy to implement?
Not really, that's not how the QCanvas works : it computes the collisions, not
us.
> Which .cpp file has the code for detecting and reacting to a user's
> double-click on a canvas?
notationcanvasview.cpp. Better look at Qt's 'canvas' sample (and QCanvas
documentation) for a start.
--
Guillaume.
http://www.telegraph-road.org
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