Patch from jdavisp3 to further improve region gain line behaviour, as discussed in bug #1841
git-svn-id: svn://localhost/ardour2/trunk@2599 d708f5d6-7413-0410-9779-e7cbd77b26cf
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@ -74,6 +74,8 @@ using namespace sigc;
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using namespace Gtk;
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using namespace Editing;
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const static double ZERO_GAIN_FRACTION = gain_to_slider_position(dB_to_coefficient(0.0));
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nframes_t
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Editor::event_frame (GdkEvent* event, double* pcx, double* pcy)
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{
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@ -2599,6 +2601,16 @@ Editor::start_control_point_grab (ArdourCanvas::Item* item, GdkEvent* event)
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start_grab (event, fader_cursor);
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// start the grab at the center of the control point so
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// the point doesn't 'jump' to the mouse after the first drag
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drag_info.grab_x = control_point->get_x();
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drag_info.grab_y = control_point->get_y();
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control_point->line().parent_group().i2w(drag_info.grab_x, drag_info.grab_y);
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track_canvas.w2c(drag_info.grab_x, drag_info.grab_y,
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drag_info.grab_x, drag_info.grab_y);
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drag_info.grab_frame = pixel_to_frame(drag_info.grab_x);
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control_point->line().start_drag (control_point, drag_info.grab_frame, 0);
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double fraction = 1.0 - ((control_point->get_y() - control_point->line().y_position()) / (double)control_point->line().height());
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@ -2624,6 +2636,18 @@ Editor::control_point_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent*
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double cx = drag_info.grab_x + drag_info.cumulative_x_drag + dx;
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double cy = drag_info.grab_y + drag_info.cumulative_y_drag + dy;
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// calculate zero crossing point. back off by .01 to stay on the
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// positive side of zero
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double _unused = 0;
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double zero_gain_y = (1.0 - ZERO_GAIN_FRACTION) * cp->line().height() - .01;
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cp->line().parent_group().i2w(_unused, zero_gain_y);
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// make sure we hit zero when passing through
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if ((cy < zero_gain_y and (cy - dy) > zero_gain_y)
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or (cy > zero_gain_y and (cy - dy) < zero_gain_y)) {
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cy = zero_gain_y;
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}
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if (drag_info.x_constrained) {
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cx = drag_info.grab_x;
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}
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@ -2761,6 +2785,18 @@ Editor::line_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
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double cx = drag_info.current_pointer_x;
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double cy = drag_info.grab_y + drag_info.cumulative_y_drag + dy;
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// calculate zero crossing point. back off by .01 to stay on the
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// positive side of zero
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double _unused = 0;
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double zero_gain_y = (1.0 - ZERO_GAIN_FRACTION) * line->height() - .01;
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line->parent_group().i2w(_unused, zero_gain_y);
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// make sure we hit zero when passing through
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if ((cy < zero_gain_y and (cy - dy) > zero_gain_y)
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or (cy > zero_gain_y and (cy - dy) < zero_gain_y)) {
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cy = zero_gain_y;
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}
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drag_info.cumulative_y_drag = cy - drag_info.grab_y;
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line->parent_group().w2i (cx, cy);
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