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fix logic error that meant one side of the waveform outline is not drawn; draw zero line before outline, for better effects with low amplitude waves

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This commit is contained in:
Paul Davis 2014-06-23 10:06:52 -04:00
parent 07fafac36e
commit 71c417948e
1 changed files with 27 additions and 29 deletions
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56
libs/canvas/wave_view.cc
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@ -491,8 +491,20 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
context->stroke ();
/* zero line goes next, so that the outline/clip is on top of it
*/
if (show_zero_line()) {
set_source_rgba (context, _zero_color);
context->set_line_width (1.0);
context->move_to (0, y_extent (0.0) + 0.5);
context->line_to (n_peaks, y_extent (0.0) + 0.5);
context->stroke ();
}
/* now add dots to the top and bottom of each line (this is
* modelled on pyramix, except that we add clipping indicators.
* modelled on pyramix, except that we also visual indicate
* clipping if it occurs).
*
* the height of the clip-indicator should be at most 7 pixels,
* or 5% of the height of the waveview item.
@ -501,15 +513,11 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
const double clip_height = min (7.0, ceil (_height * 0.05));
set_source_rgba (context, _outline_color);
for (int i = 0; i < n_peaks; ++i) {
context->move_to (i, tips[i].top);
bool show_top_clip = _global_show_waveform_clipping &&
((_shape == WaveView::Rectified && (tips[i].clip_max || tips[i].clip_min)) ||
tips[i].clip_max);
if (show_top_clip) {
if (_global_show_waveform_clipping && ((_shape == WaveView::Rectified && (tips[i].clip_max || tips[i].clip_min)) || tips[i].clip_max)) {
/* clip-indicating upper terminal line */
set_source_rgba (context, _clip_color);
context->rel_line_to (0, clip_height);
@ -521,30 +529,20 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
context->stroke ();
}
if (_global_show_waveform_clipping && _shape != WaveView::Rectified) {
context->move_to (i, tips[i].bot);
if (tips[i].clip_min) {
/* clip-indicating lower terminal line */
set_source_rgba (context, _clip_color);
context->rel_line_to (0, -clip_height);
context->stroke ();
set_source_rgba (context, _outline_color);
} else {
/* normal lower terminal dot */
context->rel_line_to (0, -1.0);
context->stroke ();
}
context->move_to (i, tips[i].bot);
if (_global_show_waveform_clipping && _shape != WaveView::Rectified && tips[i].clip_min) {
/* clip-indicating lower terminal line */
set_source_rgba (context, _clip_color);
context->rel_line_to (0, -clip_height);
context->stroke ();
set_source_rgba (context, _outline_color);
} else {
/* normal lower terminal dot */
context->rel_line_to (0, -1.0);
context->stroke ();
}
}
if (show_zero_line()) {
set_source_rgba (context, _zero_color);
context->set_line_width (1.0);
context->move_to (0, y_extent (0.0) + 0.5);
context->line_to (n_peaks, y_extent (0.0) + 0.5);
context->stroke ();
}
}
void