private void Reserve(int new_capacity)
{
if (new_capacity <= capacity)
{
return;
}
DrawVertex[] new_data = new DrawVertex[new_capacity];
if (this.data != null)
{
unsafe
{
var dest_byte_size = new_capacity * Marshal.SizeOf <DrawVertex>();
var src_byte_size = size * Marshal.SizeOf <DrawVertex>();
fixed(DrawVertex *data_ptr = this.data)
fixed(DrawVertex * new_data_ptr = new_data)
{
Buffer.MemoryCopy(data_ptr, new_data_ptr, dest_byte_size, src_byte_size);
}
}
}
this.data = null;
this.data = new_data;
this.capacity = new_capacity;
UpdatePointer();
}
/// <summary>
/// Add a poly line.
/// </summary>
/// <param name="points">points</param>
/// <param name="color">color</param>
/// <param name="close">Should this method close the polyline for you? A line segment from the last point to first point will be added if this is true.</param>
/// <param name="thickness">thickness</param>
/// <param name="antiAliased">anti-aliased</param>
public void AddPolyline(IList <Point> points, Color color, bool close, double thickness, bool antiAliased = false)
{
var pointsCount = points.Count;
if (pointsCount < 2)
{
return;
}
int count = pointsCount;
if (!close)
{
count = pointsCount - 1;
}
if (antiAliased)
{
throw new NotImplementedException();
}
else
{
// Non Anti-aliased Stroke
int idxCount = count * 6;
int vtxCount = count * 4; // FIXME: Not sharing edges
this.ShapeMesh.PrimReserve(idxCount, vtxCount);
for (int i1 = 0; i1 < count; i1++)
{
int i2 = (i1 + 1) == pointsCount ? 0 : i1 + 1;
Point p1 = points[i1];
Point p2 = points[i2];
Vector diff = p2 - p1;
diff *= MathEx.InverseLength(diff, 1.0f);
float dx = (float)(diff.X * (thickness * 0.5f));
float dy = (float)(diff.Y * (thickness * 0.5f));
var vertex0 = new DrawVertex {
pos = new Point(p1.X + dy, p1.Y - dx), uv = Point.Zero, color = color
};
var vertex1 = new DrawVertex {
pos = new Point(p2.X + dy, p2.Y - dx), uv = Point.Zero, color = color
};
var vertex2 = new DrawVertex {
pos = new Point(p2.X - dy, p2.Y + dx), uv = Point.Zero, color = color
};
var vertex3 = new DrawVertex {
pos = new Point(p1.X - dy, p1.Y + dx), uv = Point.Zero, color = color
};
this.ShapeMesh.AppendVertex(vertex0);
this.ShapeMesh.AppendVertex(vertex1);
this.ShapeMesh.AppendVertex(vertex2);
this.ShapeMesh.AppendVertex(vertex3);
this.ShapeMesh.AppendIndex(0);
this.ShapeMesh.AppendIndex(1);
this.ShapeMesh.AppendIndex(2);
this.ShapeMesh.AppendIndex(0);
this.ShapeMesh.AppendIndex(2);
this.ShapeMesh.AppendIndex(3);
this.ShapeMesh.currentIdx += 4;
}
}
}
public void AppendVertex(DrawVertex vertex)
{
this.VertexBuffer[this.vtxWritePosition] = vertex;
this.vtxWritePosition++;
}
