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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
68 lines
2.2 KiB
C++
68 lines
2.2 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().wave()];
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Color right_wave_color = right_wave_colors[m_track_manager.current_track().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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