Parametric arrowheads

[rschmehl]

Arrowheads are now modelled after the Inkscape implementations of Arrow1Mend and Arrow1Lend. M stands probably for "medium" and L for "large". The scaling is achieved with the scale transform applied to the(in this case same) path. A more suitable implementation would be a parametric arrowhead Arrow1end-0n where n can take values from 1 to 9, using a scaling factor 0.n. The paths and deltas dictionaries in class Marker can then be generated programmatically. Arrow1Mend would correspond to Arrow1end-04, using a transform scale(0.4), and Arrow1Lend to Arrow1end-08, using a transform scale(0.8).

[rschmehl]

Better approach: use a default scaling factor (0.4) and apply an optional relative (to this default) scaling factor. Accordingly, the default scaling factor (0.4) has to be multiplied by this optional scaling factor.

[rschmehl]

If at all implemented, this feature should be restricted to arrowheads (i.e. markers attached to line segments) because markers attached to points are scaled with the linewidth parameter,

[rschmehl]

Handling of markers has changed in Inkscape (1.3.2).