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Piano: Draw stereo waves

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Draw two waves in different colors.
This commit is contained in:
William McPherson 2020-02-10 00:53:47 +11:00 • committed by Andreas Kling
parent 93903c8064
commit 4ad96df0d4
3 changed files with 72 additions and 16 deletions
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25
Applications/Piano/WaveWidget.cpp
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@ -60,23 +60,32 @@ void WaveWidget::paint_event(GUI::PaintEvent& event)
painter.fill_rect(frame_inner_rect(), Color::Black);
painter.translate(frame_thickness(), frame_thickness());
Color wave_color = wave_colors[m_audio_engine.wave()];
Color left_wave_color = left_wave_colors[m_audio_engine.wave()];
Color right_wave_color = right_wave_colors[m_audio_engine.wave()];
auto buffer = m_audio_engine.buffer();
double width_scale = static_cast<double>(frame_inner_rect().width()) / buffer.size();
int prev_x = 0;
int prev_y = sample_to_y(buffer[0].left);
painter.set_pixel({ prev_x, prev_y }, wave_color);
int prev_y_left = sample_to_y(buffer[0].left);
int prev_y_right = sample_to_y(buffer[0].right);
painter.set_pixel({ prev_x, prev_y_left }, left_wave_color);
painter.set_pixel({ prev_x, prev_y_right }, right_wave_color);
for (size_t x = 1; x < buffer.size(); ++x) {
int y = sample_to_y(buffer[x].left);
int y_left = sample_to_y(buffer[x].left);
int y_right = sample_to_y(buffer[x].right);
Gfx::Point point1(prev_x * width_scale, prev_y);
Gfx::Point point2(x * width_scale, y);
painter.draw_line(point1, point2, wave_color);
Gfx::Point point1_left(prev_x * width_scale, prev_y_left);
Gfx::Point point2_left(x * width_scale, y_left);
painter.draw_line(point1_left, point2_left, left_wave_color);
Gfx::Point point1_right(prev_x * width_scale, prev_y_right);
Gfx::Point point2_right(x * width_scale, y_right);
painter.draw_line(point1_right, point2_right, right_wave_color);
prev_x = x;
prev_y = y;
prev_y_left = y_left;
prev_y_right = y_right;
}
GUI::Frame::paint_event(event);