visualizer: add support for multiple colors

src/settings.cpp

@@ -629,9 +629,16 @@ bool Configuration::read(const std::string &config_path)
 	p.add("active_column_color", assign_default(
 		active_column_color, NC::Color::Red
 	));
-	p.add("visualizer_color", assign_default(
-		visualizer_color, NC::Color::Yellow
-	));
+	p.add("visualizer_colors", option_parser::worker([this](std::string &&v) {
+		boost::sregex_token_iterator i(v.begin(), v.end(), boost::regex("\\w+")), j;
+		for (; i != j; ++i)
+		{
+			auto color = stringToColor(*i);
+			visualizer_colors.push_back(color);
+		}
+	}, [this] {
+		visualizer_colors = { NC::Color::Blue, NC::Color::Cyan, NC::Color::Green, NC::Color::Yellow, NC::Color::Red };
+	}));
 	p.add("window_border_color", assign_default(
 		window_border, NC::Border::Green
 	));

src/settings.h

@@ -109,7 +109,7 @@ struct Configuration
 	NC::Color statusbar_color;
 	NC::Color alternative_ui_separator_color;
 	NC::Color active_column_color;
-	NC::Color visualizer_color;
+	std::vector<NC::Color> visualizer_colors;
 	
 	NC::Border window_border;
 	NC::Border active_window_border;

src/visualizer.cpp

@@ -50,7 +50,7 @@ const int fps = 25;
 }
 
 Visualizer::Visualizer()
-: Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", Config.visualizer_color, NC::Border::None))
+: Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", NC::Color::Default, NC::Border::None))
 {
 	ResetFD();
 	m_samples = 44100/fps;
@@ -176,15 +176,26 @@ void Visualizer::DrawSoundWave(int16_t *buf, ssize_t samples, size_t y_offset, s
 		point_pos /= samples_per_col;
 		point_pos /= std::numeric_limits<int16_t>::max();
 		point_pos *= half_height;
-		w << NC::XY(i, y_offset+half_height+point_pos) << Config.visualizer_chars[0];
-		if (i && fabs(prev_point_pos-point_pos) > 2)
+		point_pos  = std::round(point_pos);
+
+		w << NC::XY(i, y_offset+half_height+point_pos)
+		<< Config.visualizer_colors[std::min(size_t(std::abs(point_pos) / (double)half_height *
+											Config.visualizer_colors.size()), Config.visualizer_colors.size() - 1)]
+		<< Config.visualizer_chars[0]
+		<< NC::Color::End;
+		
+		if (i && abs(prev_point_pos-point_pos) > 2)
 		{
 			// if gap is too big. intermediate values are needed
 			// since without them all we see are blinking points
 			const int breakpoint = std::max(prev_point_pos, point_pos);
 			const int half = (prev_point_pos+point_pos)/2;
 			for (int k = std::min(prev_point_pos, point_pos)+1; k < breakpoint; k += 2)
-				w << NC::XY(i-(k < half), y_offset+half_height+k) << Config.visualizer_chars[0];
+				w << NC::XY(i-(k < half), y_offset+half_height+k)
+				<< Config.visualizer_colors[std::min(size_t(std::abs(k) / (double)half_height *
+													Config.visualizer_colors.size()), Config.visualizer_colors.size() - 1)]
+				<< Config.visualizer_chars[0]
+				<< NC::Color::End;
 		}
 		prev_point_pos = point_pos;
 	}
@@ -225,7 +236,17 @@ void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t samples, size_t y_o
 		const size_t start_y = y_offset > 0 ? y_offset : height-bar_real_height;
 		const size_t stop_y = std::min(bar_real_height+start_y, w.getHeight());
 		for (size_t j = start_y; j < stop_y; ++j)
-			w << NC::XY(i, j) << Config.visualizer_chars[1];
+		{
+			w << NC::XY(i, j);
+			if (Config.visualizer_in_stereo)
+				w << Config.visualizer_colors[std::abs(int(j - w.getHeight() / 2)) /
+												((double)w.getHeight() / 2) * Config.visualizer_colors.size()];
+			else
+				w << Config.visualizer_colors[std::abs(int((double)j / stop_y * Config.visualizer_colors.size()) -
+												int(Config.visualizer_colors.size() - 1))];
+			w << Config.visualizer_chars[1]
+			<< NC::Color::End;
+		}
 	}
 }
 #endif // HAVE_FFTW3_H