c#matrixvectorhelix-3d-toolkit
How to rotate a Text In HelixToolkit
I'm trying to insert a TextVisual3D with rotated alignment. If the origin point is zero, no problem, but when the origin is in other location, the transform moves 2 times the distance. I've tried many ways, with no success. I'm using the "Up" view, the UpDirection is using the Vector (0, 1, 0), to plain the text.
var text = new TextVisual3D();
text.Foreground = Brushes.Cyan;
text.FontSize = size / 4;
text.Height = size * 2;
text.Text = value;
text.UpDirection = new Vector3D(0, 1, 0);
text.HorizontalAlignment = horizontal;
text.VerticalAlignment = vertical;
text.Position = origin.GetPoint3D();
if (Rotation!=0)
{
var angle = Rotation.Round(0);
if(angle.Abs()!=360)
{
var axis = new Vector3D(0,0,1);
var matrix = text.Transform.Value;
matrix.Rotate(new Quaternion(axis, angle));
text.Transform = new MatrixTransform3D(matrix);
}
}
return text;
The Result:
Expected:
Solution
After so many attempts, I've discovered the solution.
var text = new TextVisual3D();
text.Foreground = Brushes.Cyan;
text.FontSize = size / 4;
text.Height = size * 2;
text.Text = value;
text.UpDirection = new Vector3D(0, 1, 0);
text.HorizontalAlignment = horizontal;
text.VerticalAlignment = vertical;
text.Position = origin.GetPoint3D();
if (Rotation != 0)
{
var angle = Rotation.Round(0);
if (angle.Abs() != 360)
{
var axis = new Vector3D(0, 0, 1);
var matrix = text.Transform.Value;
var rotate = new RotateTransform3D();
var angle_axis = new AxisAngleRotation3D();
angle_axis.Angle = angle;
angle_axis.Axis = axis;
rotate.Rotation = angle_axis;
rotate.CenterX = origin.X;
rotate.CenterY = origin.Y;
text.Transform = rotate;
}
}
return text;
Result:
