Hi!
The support to create advanced outlines with the draw tool is fully
implemented. Maybe it is needed to add one more option on the tool's option
panel, but basically the feature is done.
Here is a resumee of the situation:
The Draw Tool options are now like this:
-Create Outline
-Create Advanced Outline (new)
-Create Region
-Auto Loop
-Auto Extend
-Auto Link
-Auto Export
-Pressure Width
-Local Error
-Min Pressure
-Smooth
-Width Max Error (new)
-Feather
Create Advanced Outline checkbox: When unchecked, Pressure Width and Width
Max Error are unsensitive, sensitive in contrary.
Width Max Error: it is a 0.01 to 100.0 value that is used for compare to the
squared root error of the widths achieved by the current calculated
widthpoint list and the original list of widths given by the input device.
The written number is divided by 100 before compare to the squared root
error value. Since widths form input device goes from 0.0 (no pressure ) to
1.0 (max pressure) the square root máx error can't be greater than 1.0. One
value that works fine is 0.01 and below, so I make the default value to 1.0
(later is divided by 100). I considered that for the user would be confusing
to write such so small values thinking on errors. This can be fine tuned
later.
When creating Advanced Outline Layer that doesn't extend one existing one,
there is always at last two widthpoints on the new WPList. One at the start
of the bline (at position 0.0) and one at the end of the bline (at position
1.0). That's like that because those two widthpoints are inserted on the
calculated WPList regardless the squared error value. If those two
widthpoints are enough to be below the maximum error allowed then no more
are inserted.
When extending a existing bline and AutoExtend is checked, there is not new
layer created, but the blinepoints are inserted on the existing bline (like
current behavior). When extending a bline that belongs to an Advanced
Outline, it is detected and then it happens some things:
1) Blinepoints are inserted at start or end of the bline.
2) The widths from the original Advanced Outline are modified to be able to
stay in place when the bline is enlarged (there are new blinepoints)
3) New widthpoints are inserted on the WPList of the Advanced Outline and
they are modified to be on the correct place relative to the modified bline.
To be able to make the widthpoints "stay in place" when the bline is
modified, it has been added two sub parameters to each widthpoint:
-Lower boundary ("lower_bound")
-Upper boundary ("upper_bound")
Those two real values are used to place the widthpoints on the bline.
Initially the default values for those new parameters are:
lower_bound=0.0
upper_bound=1.0
When the bline is modified, the boundaries of the existing widthpoints are
modified to the correct values to keep the widthpoints on the same place
relative to the unextended bline. Instead of modify the widthpoint position
it was decided to modify the boundary of each widthpoint. This allows to
extend existing advanced outlines with animated widthpoint positions with no
trouble. (this has to be tested)
Also, the inserted widthpoints are modified to be placed correctly on the
inserted bline stroke.
Those lower and upper boundaries are sub parameters of each Width Point
(composite type). I've set to them special characterirtics:
They cannot be exported
They cannot be animated (by default itis forbidde the animation - static-
and cannot be modified to be animatable)
They cannot be converted to anything.
This is like that because animate those boundaries would produce unexpected
results for most of the users. Maybe in the future this behavior can be
changed to be optionally modified by the user as one global prefernce.
When extending a bline, the widths values of the existing widthpoint list is
not modified. To avoid extend a bline and have abrupted changed in width due
to the user doesn't match the width of the existing widthpoints when doing
the stroke widht the stylus, The program eliminates the inserted width at
the connection point, giving a smooth transition between the old and the
inserted widths.
Cheers!
--
Carlos
http://synfig.org
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