mirror of
https://github.com/RGBCube/serenity
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b14a64b3c8
Almost all synthesizer code in Piano is removed in favor of the LibDSP reimplementation. This causes some issues that mainly have to do with the way Piano currently handles talking to LibDSP. Additionally, the sampler is gone for now and will be reintroduced with future work.
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "WaveWidget.h"
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#include "TrackManager.h"
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#include <AK/NumericLimits.h>
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#include <LibGUI/Painter.h>
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WaveWidget::WaveWidget(TrackManager& track_manager)
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: m_track_manager(track_manager)
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{
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}
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WaveWidget::~WaveWidget()
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{
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}
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int WaveWidget::sample_to_y(int sample) const
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{
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constexpr int nice_scale_factor = 4;
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sample *= nice_scale_factor;
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constexpr double sample_max = NumericLimits<i16>::max();
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double percentage = sample / sample_max;
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double portion_of_half_height = percentage * ((frame_inner_rect().height() - 1) / 2.0);
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double y = (frame_inner_rect().height() / 2.0) + portion_of_half_height;
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return y;
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}
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void WaveWidget::paint_event(GUI::PaintEvent& event)
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{
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GUI::Painter painter(*this);
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painter.fill_rect(frame_inner_rect(), Color::Black);
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painter.translate(frame_thickness(), frame_thickness());
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Color left_wave_color = left_wave_colors[m_track_manager.current_track().synth()->wave()];
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Color right_wave_color = right_wave_colors[m_track_manager.current_track().synth()->wave()];
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auto buffer = m_track_manager.buffer();
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double width_scale = static_cast<double>(frame_inner_rect().width()) / buffer.size();
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int prev_x = 0;
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int prev_y_left = sample_to_y(buffer[0].left);
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int prev_y_right = sample_to_y(buffer[0].right);
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painter.set_pixel({ prev_x, prev_y_left }, left_wave_color);
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painter.set_pixel({ prev_x, prev_y_right }, right_wave_color);
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for (size_t x = 1; x < buffer.size(); ++x) {
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int y_left = sample_to_y(buffer[x].left);
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int y_right = sample_to_y(buffer[x].right);
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Gfx::IntPoint point1_left(prev_x * width_scale, prev_y_left);
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Gfx::IntPoint point2_left(x * width_scale, y_left);
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painter.draw_line(point1_left, point2_left, left_wave_color);
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Gfx::IntPoint point1_right(prev_x * width_scale, prev_y_right);
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Gfx::IntPoint point2_right(x * width_scale, y_right);
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painter.draw_line(point1_right, point2_right, right_wave_color);
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prev_x = x;
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prev_y_left = y_left;
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prev_y_right = y_right;
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}
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GUI::Frame::paint_event(event);
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}
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