/// <summary>
/// calculate the matrix used to transform 3D to 2D
/// </summary>
/// <returns>
/// matrix used to transform 3d points to 2d
/// </returns>
private Matrix4 Get3DTo2DMatrix()
{
Matrix4 result = Matrix4.Multiply(
m_to2DMatrix.Inverse(), m_moveToCenterMatrix.Inverse());
result = Matrix4.Multiply(result, m_scaleMatrix);
return(Matrix4.Multiply(result, new Matrix4(new Vector4(m_center.X, m_center.Y, 0))));
}
/// <summary>
/// calculate the matrix used to transform 2D to 3D
/// </summary>
/// <returns>
/// matrix used to transform 2d points to 3d
/// </returns>
private Matrix4 Get2DTo3DMatrix()
{
Matrix4 matrix = Matrix4.Multiply(
new Matrix4(new Vector4(-m_center.X, -m_center.Y, 0)), m_scaleMatrix.Inverse());
matrix = Matrix4.Multiply(
matrix, m_moveToCenterMatrix);
return(Matrix4.Multiply(matrix, m_to2DMatrix));
}
/// <summary>
/// Get max and min coordinates of all points
/// </summary>
/// <returns>
/// points array stores the bounding box of all points
/// </returns>
private List <PointF> GetBoundsPoints()
{
Matrix4 matrix = m_to2DMatrix;
Matrix4 inverseMatrix = matrix.Inverse();
float minX = 0, maxX = 0, minY = 0, maxY = 0;
bool bFirstPoint = true;
List <PointF> resultPoints = new List <PointF>();
//get the max and min point on the face
foreach (Autodesk.Revit.DB.XYZ point in m_drawing.Geometry.GridVertexesXYZ)
{
Vector4 v = new Vector4(point);
Vector4 v1 = inverseMatrix.Transform(v);
if (bFirstPoint)
{
minX = maxX = v1.X;
minY = maxY = v1.Y;
bFirstPoint = false;
}
else
{
if (v1.X < minX)
{
minX = v1.X;
}
else if (v1.X > maxX)
{
maxX = v1.X;
}
if (v1.Y < minY)
{
minY = v1.Y;
}
else if (v1.Y > maxY)
{
maxY = v1.Y;
}
}
}
resultPoints.Add(new PointF(minX, minY));
resultPoints.Add(new PointF(maxX, maxY));
return(resultPoints);
}
