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bfd86c4631
The overwhelming majority of GUI::Frame users set the same appearance, so let's just make it the default.
89 lines
3.4 KiB
C++
89 lines
3.4 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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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "WaveWidget.h"
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#include "AudioEngine.h"
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#include <LibGUI/Painter.h>
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#include <limits>
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WaveWidget::WaveWidget(AudioEngine& audio_engine)
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: m_audio_engine(audio_engine)
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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 = std::numeric_limits<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_audio_engine.wave()];
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Color right_wave_color = right_wave_colors[m_audio_engine.wave()];
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auto buffer = m_audio_engine.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::Point point1_left(prev_x * width_scale, prev_y_left);
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Gfx::Point 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::Point point1_right(prev_x * width_scale, prev_y_right);
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Gfx::Point 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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