Hi all,
I just extended the waveform so that markers on the waveform can have
text annotated on them. The markers can be aligned top, center, or
bottom. The alignment, text color and marker background color can be
specified in the XML like so:
<Visual>
...
<Mark>
<Control>cue_point</Control>
<Color>#000000</Color>
<Text>CUE</Text>
<TextColor>#0000ff</TextColor>
<Align>Center</Align>
</Mark>
<Mark>
<Control>loop_start_position</Control>
<Color>#000000</Color>
<Text>IN</Text>
<TextColor>#0000ff</TextColor>
<Align>Center</Align>
</Mark>
<Mark>
<Control>loop_end_position</Control>
<Color>#000000</Color>
<Text>OUT</Text>
<TextColor>#0000ff</TextColor>
<Align>Center</Align>
</Mark>
</Visual>
If <TextColor> is not provided, then the <MarkerColor> of the <Visual>
element is used. Similarly, if <Color> is not provided, the inverse of
<BgColor> of the <Visual> tag is used.
Here's a screenshot. I'm using the default QApplication font, and 8pt
font. The horizontal margin on each side of the text is one quarter of
the average glyph size of the font. The bubble around the text is
automatically sized correctly as per the layout prediction QFontMetrics
provides, so changing the font size is not an issue.
Screenshots:
http://web.mit.edu/rryan/Public/markers.png
http://web.mit.edu/rryan/Public/markers-square.png
I'd like feedback on what people think of this usability wise. In
particular, I tried to pick something that had suitable contrast. I
sidestepped the issue of text color by just making it the default color
of the deck the marker applies to. Phil has already mentioned that he
prefers square boxes to the rounded boxes in the first screenshot. If
anything, the background shape can be configurable. I prefer the rounded
boxes because the square seems a little jagged.
Another issue I'd like thoughts on is how to deal with when markers are
overlapping. Automatically making them avoid each other will take a
little bit of work, and might obscure the waveform.
Thoughts?
RJ Ryan
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