public static List <VertexArray> GenerateLineWithThickness(List <Vector2f> points, Color color, float thickness, bool[] lines)
{
List <VertexArray> result = new List <VertexArray>( );
VertexArray array = new VertexArray(PrimitiveType.TrianglesStrip);
for (int i = 0; i < points.Count; i++)
{
Vector2f v0 = (i == 0 ? 2 * points[0] - points[1] : points[i - 1]);
Vector2f v1 = points[i];
Vector2f v2 = (i == points.Count - 1 ? 2 * points[i] - points[i - 1] : points[i + 1]);
Vector2f v01 = (v1 - v0).Normalized( );
Vector2f v12 = (v2 - v1).Normalized( );
Vector2f d = (v01 + v12).GetNormal( );
float dot = d.Dot(v01.GetNormal( ));
d *= thickness / 2f / dot; //< TODO: Add flat miter joint in extreme cases
if (lines[i % lines.Length])
{
array.Append(new Vertex(v1 + d, color));
array.Append(new Vertex(v1 - d, color));
}
else
{
if (array.VertexCount > 0)
{
result.Add(array);
array = new VertexArray(PrimitiveType.TrianglesStrip);
}
}
}
if (array.VertexCount > 0)
{
result.Add(array);
}
return(result);
}
VertexArray GenerateTrianglesStrip(List <Vector2f> points, Color color, float thickness, bool open)
{
var array = new VertexArray(PrimitiveType.TrianglesStrip);
for (int i = 1; i < points.Count + 1 + (open ? 0 : 1); i++)
{
Vector2f v0 = points[(i - 1) % points.Count];
Vector2f v1 = points[i % points.Count];
Vector2f v2 = points[(i + 1) % points.Count];
Vector2f v01 = (v1 - v0).Normalized();
Vector2f v12 = (v2 - v1).Normalized();
Vector2f d = (v01 + v12).GetNormal();
float dot = d.Dot(v01.GetNormal());
d *= thickness / 2f / dot; //< TODO: Add flat miter joint in extreme cases // d *= thickness / 2f / (float)Math.Max(.8, dot);
if (points.Count == i)
{
array.Append(new Vertex(v0 - d / 4, color));
array.Append(new Vertex(v0 + d / 4, color));
}
else
{
array.Append(new Vertex(v0 + d, color));
array.Append(new Vertex(v0 - d, color));
}
}
return(array);
}
