The line factor for shapes like arrows and keyholes. The head factor for these shapes can be modified through the ShapeHeadFactor property.
The line factor range is between 1 and 100: if the value exceeds this range, 50 will be assumed; by default the factor 50 is selected.
Applies only when the Shape property is set to SHAPE_ARROW or SHAPE_KEYHOLE
Here the ShapeLineFactor property is set to 50 (default):
here the ShapeLineFactor property is set to 100:
here the ShapeLineFactor property is set to 5:
all of the pictures above have the ShapeHeadFactor property set to 50.