#include "vu_common.h"
-#include <math.h>
-#include <algorithm>
-
-#include <QBrush>
#include <QColor>
#include <QPainter>
+#include <algorithm>
+#include <cmath>
using namespace std;
-double lufs_to_pos(float level_lu, int height)
-{
- const float min_level = 9.0f; // y=0 is top of screen, so “min” is the loudest level.
- const float max_level = -18.0f;
+double lufs_to_pos(float level_lu, int height, float min_level, float max_level)
+{
+ // Note: “max” is the loudest level, but y=0 is top of screen.
// Handle -inf.
- if (level_lu < max_level) {
+ if (level_lu < min_level) {
return height - 1;
}
- double y = height * (level_lu - min_level) / (max_level - min_level);
+ double y = height * (level_lu - max_level) / (min_level - max_level);
y = max<double>(y, 0);
y = min<double>(y, height - 1);
// If we are big enough, snap to pixel grid instead of antialiasing
// the edges; the unevenness will be less noticeable than the blurriness.
- double height_per_level = height / (min_level - max_level) - 2.0;
+ double height_per_level = height / (max_level - min_level) - 2.0;
if (height_per_level >= 10.0) {
y = round(y);
}
return y;
}
-void draw_vu_meter(QPainter &painter, int width, int height, int margin, bool is_on)
+void draw_vu_meter(QPainter &painter, int width, int height, int horizontal_margin, double segment_margin, bool is_on, float min_level, float max_level, bool flip)
{
- painter.fillRect(margin, 0, width - 2 * margin, height, Qt::black);
+ painter.fillRect(horizontal_margin, 0, width - 2 * horizontal_margin, height, Qt::black);
for (int y = 0; y < height; ++y) {
// Find coverage of “on” rectangles in this pixel row.
double coverage = 0.0;
- for (int level = -18; level < 9; ++level) {
- double min_y = lufs_to_pos(level + 1.0, height) + 1.0;
- double max_y = lufs_to_pos(level, height) - 1.0;
+ for (int level = floor(min_level); level <= ceil(max_level); ++level) {
+ double min_y = lufs_to_pos(level + 1.0, height, min_level, max_level) + segment_margin * 0.5;
+ double max_y = lufs_to_pos(level, height, min_level, max_level) - segment_margin * 0.5;
min_y = std::max<double>(min_y, y);
min_y = std::min<double>(min_y, y + 1);
max_y = std::max<double>(max_y, y);
int r = lrintf(255 * pow(on_r * coverage, 1.0 / 2.2));
int g = lrintf(255 * pow(on_g * coverage, 1.0 / 2.2));
int b = lrintf(255 * pow(on_b * coverage, 1.0 / 2.2));
- painter.fillRect(margin, y, width - 2 * margin, 1, QColor(r, g, b));
+ int draw_y = flip ? (height - y - 1) : y;
+ painter.fillRect(horizontal_margin, draw_y, width - 2 * horizontal_margin, 1, QColor(r, g, b));
}
}