private void AddVertex(GetStripColor stripColor, GetStripWidth stripWidth, Vector2 pos, float rot, int index, float progress)
{
while (index + 1 >= _vertices.Length)
{
Array.Resize(ref _vertices, _vertices.Length * 2);
}
Color color = stripColor(progress);
Vector2 scaleFactor = stripWidth(progress);
Vector2 value = MathHelper.WrapAngle(rot - (float)Math.PI / 2f).ToRotationVector2() * scaleFactor;
_vertices[index].Position = pos + value;
_vertices[index + 1].Position = pos - value;
_vertices[index].TexCoord = new Vector2(progress, 1f);
_vertices[index + 1].TexCoord = new Vector2(progress, 0f);
_vertices[index].Color = color;
_vertices[index + 1].Color = color;
}
public void PrepareStrip(Vector2[] oldPos, float[] oldRot, GetStripWidth stripWidth, GetStripColor stripColor, Vector2 offset = default(Vector2), int?expectedVertexPairsAmount = null, bool includeBacksides = false)
{
int lenght = oldPos.Length;
int vertexLenght = _vertexAmountCurrentlyMaintained = lenght * 2;
if (_vertices.Length < vertexLenght)
{
Array.Resize(ref _vertices, vertexLenght);
}
int expectedAmount = expectedVertexPairsAmount.HasValue ? expectedVertexPairsAmount.Value : lenght;
for (int i = 0; i < lenght; i++)
{
if (oldPos[i] == Vector2.Zero)
{
lenght = i - 1;
expectedVertexPairsAmount = lenght * 2;
}
Vector2 pos = oldPos[i] + offset;
float rot = MathHelper.WrapAngle(oldRot[i]);
float progress = (float)i / (float)(expectedAmount - 1);
AddVertex(stripColor, stripWidth, pos, rot, i * 2, progress);
}
PrepareIndices(lenght, includeBacksides);
}