private static bool IsChord(MusicSymbol symbol)
{
return(symbol is ChordSymbol);
}
/** Shade all the chords played in the given time.
* Un-shade any chords shaded in the previous pulse time.
* Store the x coordinate location where the shade was drawn.
*/
public void ShadeNotes(Graphics g, SolidBrush shadeBrush, Pen pen,
int currentPulseTime, int prevPulseTime, ref int x_shade)
{
/* If there's nothing to unshade, or shade, return */
if ((starttime > prevPulseTime || endtime < prevPulseTime) &&
(starttime > currentPulseTime || endtime < currentPulseTime))
{
return;
}
/* Skip the left side Clef symbol and key signature */
int xpos = keysigWidth;
MusicSymbol curr = null;
ChordSymbol prevChord = null;
int prev_xpos = 0;
/* Loop through the symbols.
* Unshade symbols where start <= prevPulseTime < end
* Shade symbols where start <= currentPulseTime < end
*/
for (int i = 0; i < symbols.Count; i++)
{
curr = symbols[i];
if (curr is BarSymbol)
{
xpos += curr.Width;
continue;
}
int start = curr.StartTime;
int end = 0;
if (i + 2 < symbols.Count && symbols[i + 1] is BarSymbol)
{
end = symbols[i + 2].StartTime;
}
else if (i + 1 < symbols.Count)
{
end = symbols[i + 1].StartTime;
}
else
{
end = endtime;
}
/* If we've past the previous and current times, we're done. */
if ((start > prevPulseTime) && (start > currentPulseTime))
{
if (x_shade == 0)
{
x_shade = xpos;
}
return;
}
/* If shaded notes are the same, we're done */
if ((start <= currentPulseTime) && (currentPulseTime < end) &&
(start <= prevPulseTime) && (prevPulseTime < end))
{
x_shade = xpos;
return;
}
bool redrawLines = false;
/* If symbol is in the previous time, draw a white background */
if ((start <= prevPulseTime) && (prevPulseTime < end))
{
g.TranslateTransform(xpos - 2, -2);
g.FillRectangle(Brushes.White, 0, 0, curr.Width + 4, this.Height + 4);
g.TranslateTransform(-(xpos - 2), 2);
g.TranslateTransform(xpos, 0);
curr.Draw(g, pen, ytop);
g.TranslateTransform(-xpos, 0);
redrawLines = true;
}
/* If symbol is in the current time, draw a shaded background */
if ((start <= currentPulseTime) && (currentPulseTime < end))
{
x_shade = xpos;
g.TranslateTransform(xpos, 0);
g.FillRectangle(shadeBrush, 0, 0, curr.Width, this.Height);
curr.Draw(g, pen, ytop);
g.TranslateTransform(-xpos, 0);
redrawLines = true;
}
/* If either a gray or white background was drawn, we need to redraw
* the horizontal staff lines, and redraw the stem of the previous chord.
*/
if (redrawLines)
{
int line = 1;
int y = ytop - SheetMusic.LineWidth;
pen.Width = 1;
g.TranslateTransform(xpos - 2, 0);
for (line = 1; line <= 5; line++)
{
g.DrawLine(pen, 0, y, curr.Width + 4, y);
y += SheetMusic.LineWidth + SheetMusic.LineSpace;
}
g.TranslateTransform(-(xpos - 2), 0);
if (prevChord != null)
{
g.TranslateTransform(prev_xpos, 0);
prevChord.Draw(g, pen, ytop);
g.TranslateTransform(-prev_xpos, 0);
}
if (showMeasures)
{
DrawMeasureNumbers(g, pen);
}
if (lyrics != null)
{
DrawLyrics(g, pen);
}
}
if (curr is ChordSymbol)
{
ChordSymbol chord = (ChordSymbol)curr;
if (chord.Stem != null && !chord.Stem.Receiver)
{
prevChord = (ChordSymbol)curr;
prev_xpos = xpos;
}
}
xpos += curr.Width;
}
}