PK_blend_rho_t

typedef int PK_blend_rho_t;

Used in:

PK_blend_shape_t
PK_EDGE_set_blend_chain_o_t
PK_EDGE_set_blend_variable_o_t

This datatype controls how rho values are handled when creating conic shaped
blends.

It has two values:
    PK_blend_rho_absolute_c        rho is independent of the angle subtended
                                   by the blend.
    PK_blend_rho_relative_c        rho is relative to the angle subtended by
                                   the blend. A value of 0.5 will give the
                                   least tension ellipse (circle) solution.
    PK_blend_rho_centre_c          rho is the radius of curvature at the
                                   centre of the blend cross-section.

Absolute rho values enable the user to easily choose the type of conic they
want (<0.5 ellipse, 0.5 parabola, >0.5 hyperbola). Relative values allow the
user to easily choose the least tension (circular) solution and variations
from that.  Centre values allow the user to control the central radius
of curvature of the conic.