tempo mapping: adjust BPM delta during a twist to reflect zoom level
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@ -3789,7 +3789,12 @@ MappingTwistDrag::motion (GdkEvent* event, bool first_move)
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/* XXX needs to scale somehow with zoom level */
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delta += 0.75 * (last_pointer_x() - _drags->current_pointer_x());
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const double pixel_distance = last_pointer_x() - _drags->current_pointer_x();
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const double spp = _editor->get_current_zoom();
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const double scaling_factor = 0.4 * (spp / 1000.);
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delta += scaling_factor * pixel_distance;
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std::cerr << "pixels: " << pixel_distance << " @ " << spp << " spp SF " << scaling_factor << " => delta " << delta << std::endl;
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map->twist_tempi (prev, focus, next, initial_npm + delta);
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_editor->mid_tempo_change (Editor::MappingChanged);
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