Draft: improve the audio vizualiser

TODO:

• Add time axis
• Add a way to zoom in / zoom out on X axis
• Add a way to change "audio sensibility" for spectrum
• Add the display of timed lines/syl
• Make the timing Bar draggable and reflect the changes in the ASS
• Maybe add lots of rainbowish colors to the spectrum because rainbows are great

src/UI/DocumentViews/TimingAxis.cc

@@ -9,6 +9,7 @@
 #include <QScrollArea>
 #include <QScrollBar>
 #include <QVBoxLayout>
+#include <QTime>
 
 using namespace Vivy;
 
@@ -56,13 +57,31 @@ void TimingAxis::paint(QPainter *painter, const QStyleOptionGraphicsItem *option
     if (audioLength == 0)
         return;
 
-    painter->drawLine(x0, y, x1, y);
+    int ticks_base = y+ticksBase;
+    int yText = ticks_base - majorTicksHeight - timeDigitsMargin;
+    int majorTicksUp = ticks_base - majorTicksHeight;
+    int minorTicksUp = ticks_base - minorTicksHeight;
 
-    for (qreal i = majorTicks; i < x1-x0; i += majorTicks){
-        painter->drawLine(int(x0+i), y-5, int(x0+i), y+5);
+    painter->drawLine(x0, ticks_base, x1, ticks_base);
+
+    for (int i = majorTicks; i < x1-x0; i += majorTicks){
+        painter->drawText(QPoint(x0+i, yText), msToString(i));
+        painter->drawLine(int(x0+i), majorTicksUp, int(x0+i), ticks_base);
     }
     if (minorTicks >= 0)
-        for (qreal i = minorTicks; i < x1-x0; i += minorTicks)
+        for (int i = minorTicks; i < x1-x0; i += minorTicks)
             if (fmod(i, majorTicks) != 0)
-                painter->drawLine(int(x0+i), y-2, int(x0+i), y+2);
+                painter->drawLine(int(x0+i), minorTicksUp, int(x0+i), ticks_base);
+}
+
+QString
+TimingAxis::msToString(int t) const noexcept
+{
+    qDebug() << "GOT " << t;
+    QString ret(QString::number(t/1000) + QString(".") + QString::number(t % 1000 / majorTicks));
+    if (t >= 60000)
+        ret.prepend(QString::number(t/60000) + QString(":"));
+    if (t >= 360000)
+        ret.prepend(QString::number(t/360000) + QString(":"));
+    return ret;
 }