/// <summary>
/// Calculate geometry info for truss
/// </summary>
private void GetTrussGeometryInfo()
{
// get the start and end point of the basic line of the truss
m_points = GetTrussPoints();
// Get a matrix which can transform points to 2D
m_to2DMatrix = GetTo2DMatrix();
// get the boundary of all the points
m_boundPoints = GetBoundsPoints();
// get a matrix which can keep all the points in the center of the canvas
m_moveToCenterMatrix = GetMoveToCenterMatrix();
// get a matrix for scaling all the points and lines within the canvas
m_scaleMatrix = GetScaleMatrix();
// transform 3D points to 2D
m_transformMatrix = Get3DTo2DMatrix();
// transform from 2D to 3D
m_restoreMatrix = Get2DTo3DMatrix();
// transform from 2D (on picture box) to truss profile plane
m_2DToTrussProfileMatrix = Get2DToTrussProfileMatrix();
// create the graphics path which contains all the lines
CreateGraphicsPath();
}
/// <summary>
/// multiply matrix left and right
/// </summary>
/// <param name="left">left matrix</param>
/// <param name="right">right matrix</param>
/// <returns></returns>
public static Matrix4 Multiply(Matrix4 left, Matrix4 right)
{
Matrix4 result = new Matrix4();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
result[i, j] = left[i, 0] * right[0, j] + left[i, 1] * right[1, j]
+ left[i, 2] * right[2, j] + left[i, 3] * right[3, j];
}
}
return result;
}
