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Spa8nky

[XNA] Drawing a spline of arbitrary length.

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Hi folks,

I'm trying to figure out a good way of drawing a spline of arbitrary length.

Currently I generate all the indices at load time:


static readonly ushort[] splineIndices = GenerateSplineIndices();

private static ushort[] GenerateSplineIndices()
{
ushort[] indices = new ushort[MAXINDICES];
int j = 0;

for (ushort i = 0; i < MAXINDICES / 2; ++i)
{
indices[j++] = i;
indices[j++] = (ushort)(i + 1);
}

return indices;
}



The indices are then chopped to fit the size of the spline as follows:


public void DrawSpline(Vector3[] interpolatedPoints, Color color)
{
ushort[] indices = new ushort[interpolatedPoints.Length * 2];
int numIndices = indices.Length - 1;

for (int i = 0; i < numIndices; ++i)
{
indices = splineIndices;
}

indices[numIndices] = indices[numIndices - 1];

DrawWireShape(interpolatedPoints, indices, color);
}



Currently I am not happy that I have to copy each value over to a new array each time I wish to draw the spline.

Unfortunately this has to be case because I must have a degenerate index at the end of the array in order to stop the end point linking up with the next shape drawn.

Can anyone suggest where improvements could be made and how I could avoid this?

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