/// <summary>
/// calculate the matrix used to transform 3D to 2D
/// </summary>
/// <returns>maxtrix is use to transform 3d points to 2d</returns>
public virtual Matrix4 Compute3DTo2DMatrix()
{
Matrix4 result = Matrix4.Multiply(
m_to2DMatrix.Inverse(), m_moveToCenterMatrix.Inverse());
m_transformMatrix = Matrix4.Multiply(result, m_scaleMatrix);
return(m_transformMatrix);
}
/// <summary>
/// Get the bound of a face
/// </summary>
/// <returns>points array stores the bound of the face</returns>
public override PointF[] GetFaceBounds()
{
Matrix4 matrix = m_to2DMatrix;
Matrix4 inverseMatrix = matrix.Inverse();
float minX = 0, maxX = 0, minY = 0, maxY = 0;
bool bFirstPoint = true;
//get the max and min point on the face
for (int i = 0; i < m_points.Count; i++)
{
List <XYZ> points = m_points[i];
foreach (Autodesk.Revit.DB.XYZ point in points)
{
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;
}
}
}
}
//return an array with max and min value of face
PointF[] resultPoints = new PointF[2] {
new PointF(minX, minY), new PointF(maxX, maxY)
};
return(resultPoints);
}
/// <summary>
/// transform the point on Form to 3d world coordinate of revit
/// </summary>
/// <param name="ps">contain the points to be transformed</param>
/// <returns>Vector list contains points being transformed</returns>
public virtual List <Vector4> Transform2DTo3D(Point[] ps)
{
List <Vector4> result = new List <Vector4>();
TransformPoints(ps);
Matrix4 transformMatrix = Matrix4.Multiply(
m_scaleMatrix.Inverse(), m_moveToCenterMatrix);
transformMatrix = Matrix4.Multiply(transformMatrix, m_to2DMatrix);
foreach (Point point in ps)
{
Vector4 v = new Vector4(point.X, point.Y, 0);
v = transformMatrix.Transform(v);
result.Add(v);
}
return(result);
}