void Draw(PaintingRecord record, int startIndex, int endIndex, Graphics graphics, Pen pen)
{
GraphicsPath graphicsPath = new GraphicsPath();
PointF? start = null;
for (int i = startIndex; i <= endIndex; i++)
{
var command = record[i];
if (i >= 1)
{
var ls = record[i - 1];
if (ls.Type != CommandType.DrawOpEnd)
{
start = new PointF(Math.Abs(ls.Coord.X), Math.Abs(ls.Coord.Y));
}
else
{
graphicsPath.StartFigure();
start = null;
}
}
PointF point = new PointF(Math.Abs(command.Coord.X), Math.Abs(command.Coord.Y));
if (start != null)
{
graphicsPath.AddLine(start.Value, point);
}
else
{
}
}
graphics.DrawPath(pen, graphicsPath);
}
void DoDraw(PaintingRecord record, int startIndex, int endIndex, Graphics graphics, Pen pen)
{
Action action = () =>
{
Draw(record, startIndex, endIndex, graphics, pen);
};
this.BeginInvoke(action);
}