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display waveform polarity correctly

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* cairo's Y axis points downward -> invert phase display
* fix logarithmic view for value.max < 0
This commit is contained in:
Robin Gareus 2013-04-18 10:25:09 +02:00
parent 731b2c1ae9
commit b7aeb147f2
1 changed files with 2 additions and 2 deletions
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4
libs/canvas/wave_view.cc
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@ -444,7 +444,7 @@ WaveView::CacheEntry::image ()
if (y > 0.0) {
context->line_to (i + 0.5, position (alt_log_meter (fast_coefficient_to_dB (y))));
} else if (y < 0.0) {
context->line_to (i + 0.5, position (alt_log_meter (fast_coefficient_to_dB (-y))));
context->line_to (i + 0.5, position (-alt_log_meter (fast_coefficient_to_dB (-y))));
} else {
context->line_to (i + 0.5, position (0.0));
}
@ -559,7 +559,7 @@ WaveView::CacheEntry::position (double s) const
default:
break;
}
return (s+1.0) * (_wave_view->_height / 2.0);
return (1.0-s) * (_wave_view->_height / 2.0);
}
void