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show zero line when a DC offset moves waveform so that it doesn't intersect with the zero line (from Nimal Ratnayake <nimalr@pdn.ac.lk>)

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This commit is contained in:
Paul Davis 2015-06-24 14:12:13 -04:00
parent 2ea5962af2
commit fe672c827c
1 changed files with 5 additions and 4 deletions
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9
libs/canvas/wave_view.cc
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@ -575,7 +575,7 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
outline_context->stroke (); outline_context->stroke ();
} else { } else {
const double height_2 = _height * .5; const int height_zero = floor( _height * .5);
for (int i = 0; i < n_peaks; ++i) { for (int i = 0; i < n_peaks; ++i) {
@ -601,10 +601,11 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
} }
} }
/* zero line, show only if there is enough spread */ /* zero line, show only if there is enough spread
or the waveform line does not cross zero line */
if (tips[i].spread >= 5.0 && show_zero_line()) { if (show_zero_line() && ((tips[i].spread >= 5.0) || (tips[i].top > height_zero ) || (tips[i].bot < height_zero)) ) {
zero_context->move_to (i, floor(height_2)); zero_context->move_to (i, height_zero);
zero_context->rel_line_to (1.0, 0); zero_context->rel_line_to (1.0, 0);
} }