private void Audio_DataAvailable(object sender, WaveInEventArgs e)
{
VertexData vd;
List <VertexData> data = new List <VertexData>();
for (int i = 0; i < e.BytesRecorded; i += 8)
{
vd = new VertexData();
vd.Position = new Vector2(
BitConverter.ToSingle(e.Buffer, i),
BitConverter.ToSingle(e.Buffer, i + 4)
);
data.Add(vd);
}
if (settings.Interpolate)
{
data = LineTools.Interpolate(data, settings.IntrpLevel);
}
LineTools.ComputeNormals(ref data);
if (dataQueue.Count > data.Count)
{
dataQueue.Clear();
}
ticks = Math.Max(ticks - 1, 1);
vertexLength = (int)Math.Ceiling((double)(data.Count / ticks));
/*vertexLength = Math.Max(vertexLength, 1000);
* vertexLength = Math.Min(vertexLength, data.Count);*/
ticks = 0;
data.ForEach(dataQueue.Enqueue);
// if the new vertex count is bigger than the cache, set it up again
if (vertexLength * LineMaterial.VERTEX_STRIDE > vertices.Length)
{
setupArrays(vertexLength);
}
}
public static void ComputeNormals(ref List <VertexData> data)
{
float miterMax = Width * 1.5f;
float halfWidth = Width / 2f;
bool isFirst = true; // work-around non-nullable vectors
bool isLast = false;
VertexData last, cur, next = new VertexData();
Vector2 tangent, dirA, dirB, curNormal = Vector2.Zero;
for (int i = 1; i < data.Count; i++)
{
last = data[i - 1];
cur = data[i];
if (i < data.Count - 1)
{
next = data[i + 1];
}
else
{
isLast = true;
}
dirA = (cur.Position - last.Position).Normalized();
if (isFirst) // set up first normal
{
last.Normal = new Vector2(-dirA.Y, dirA.X);
last.MiterLength = Width;
data[0] = last;
isFirst = false;
}
if (isLast) // set up last normal
{
cur.Normal = new Vector2(-dirA.Y, dirA.X);
cur.MiterLength = Width;
}
else
{
dirB = (next.Position - cur.Position).Normalized();
// compute miter by Matt DesLauriers @mattdesl
// get tangent line
tangent = (dirA + dirB).Normalized();
// get miter as unit vector
cur.Normal = new Vector2(-tangent.Y, tangent.X);
//get the necessary length of our miter
cur.MiterLength = halfWidth / Vector2.Dot(cur.Normal, new Vector2(-dirA.Y, dirA.X));
if (cur.MiterLength < -miterMax)
{
cur.MiterLength = -miterMax; // Math.Abs(cur.MiterLength);
}
if (cur.MiterLength > miterMax)
{
cur.MiterLength = miterMax;
}
}
data[i] = cur;
}
}