private void RenderWave(Graphics g, Channel channel, int triggerPoint, Pen pen, Brush brush, PointF[] points, GraphicsPath path)
{
// And the initial sample index
var leftmostSampleIndex = triggerPoint - channel.ViewWidthInSamples / 2;
float xOffset = channel.Bounds.Left;
float xScale = (float)channel.Bounds.Width / channel.ViewWidthInSamples;
float yOffset = channel.Bounds.Top + channel.Bounds.Height * 0.5f;
float yScale = -channel.Bounds.Height * 0.5f;
for (int i = 0; i < channel.ViewWidthInSamples; ++i)
{
var sampleValue = channel.GetSample(leftmostSampleIndex + i, false);
points[i].X = xOffset + i * xScale;
points[i].Y = yOffset + sampleValue * yScale;
}
// Then draw them all in one go...
if (pen != null)
{
g.DrawLines(pen, points);
}
if (brush != null)
{
// We need to add points to complete the path
path.Reset();
path.AddLine(points[0].X, yOffset, points[0].X, points[0].Y);
path.AddLines(points);
path.AddLine(points[points.Length - 1].X, points[points.Length - 1].Y, points[points.Length - 1].X, yOffset);
g.FillPath(brush, path);
}
}
private void RenderWave(Graphics g, Channel channel, int triggerPoint, Pen pen, Brush brush, PointF[] points, GraphicsPath path, double fillBase)
{
// And the initial sample index
var leftmostSampleIndex = triggerPoint - channel.ViewWidthInSamples / 2;
float xOffset = channel.Bounds.Left;
float xScale = (float)channel.Bounds.Width / channel.ViewWidthInSamples;
float yOffset = channel.Bounds.Top + channel.Bounds.Height * 0.5f;
float yScale = -channel.Bounds.Height * 0.5f;
for (int i = 0; i < channel.ViewWidthInSamples; ++i)
{
var sampleValue = channel.GetSample(leftmostSampleIndex + i, false);
points[i].X = xOffset + i * xScale;
points[i].Y = yOffset + sampleValue * yScale;
}
if (channel.Clip)
{
for (int i = 0; i < channel.ViewWidthInSamples; ++i)
{
points[i].Y = Math.Min(Math.Max(points[i].Y, channel.Bounds.Top), channel.Bounds.Bottom);
}
}
if (channel.SmoothLines)
{
// Enable anti-aliased lines
g.SmoothingMode = SmoothingMode.HighQuality;
}
else
{
g.SmoothingMode = SmoothingMode.None;
}
// Then draw them all in one go...
if (pen != null)
{
// TODO: this is expensive
g.DrawLines(pen, points);
}
if (brush != null)
{
// We need to add points to complete the path
// We compute the Y position of this line. -0.5 scales -1..1 to bottom..top.
var baseY = (float)(yOffset + channel.Bounds.Height * -0.5 * fillBase);
path.Reset();
path.AddLine(points[0].X, baseY, points[0].X, points[0].Y);
path.AddLines(points);
path.AddLine(points[points.Length - 1].X, points[points.Length - 1].Y, points[points.Length - 1].X, baseY);
g.FillPath(brush, path);
}
}
