Michael Gregorius 461cb2bb3c Improve the rendering of melody patterns (mapped to [0,1] x [0,1]) ...

Compute the height of the potential text field before rendering the
melody pattern so that we can use that information later.

Transform the painter so that notes drawn into a [0,1] x [0,1]
coordinate system are drawn at the correct position on the pattern
widget. Add code that moves the pattern notes smoothly under the text
label in case there is not much space, i.e. for narrow patterns. Notes
are drawn as filled rectangles with a slightly darker border.

Always draw at least an octave of notes onto the pattern, so that
patterns with just a single note will not look strange, i.e. that they
are not filled completely with the note. If there is additional space to
fill it will be rather filled at the top of the pattern so that single
notes have a high chance of being drawn below the pattern text.

Simplify the drawing of the inner and outer border.

Use numeric_limits to initialize the minimum and maximum key.

Remove some redundant checks whether the pattern holds notes and
decrease the indentation depth by two tabs for most of the code.

2017-07-26 20:39:50 +02:00

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