The diagram toolbar gets an "Ajouter un arc" button next to the
ellipse. Click one end, then click the other end at the height the arc
should reach: the result is a half arc bulging up or down from the line
between the two clicks (Shift: a true half circle). It is not filled,
since a fill would close it into a half disc.
A selected half arc shows one more handle, in the middle of the curve.
Dragging it makes the arc deeper or flatter while both ends stay put;
dragging it across the line between the ends turns the arc over. The
handle is hidden whenever the arc is not a half arc on a horizontal or
vertical diameter, because only then is "keep the ends, move the
middle" one well-defined change.
Nothing new is stored: an arc stays an Ellipse with a start and end
angle, exactly as the existing arc handles of an ellipse save it, so
files read by older versions are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Shapes and images can now be resized, rotated, and skewed directly
on the canvas, not just moved. Both share one small transform
struct (rotation, then skew, then scale, anchored on a movable
pivot) and one handle widget, so a corner drag, an edge skew, or
grabbing the rotate handle behaves the same way and runs through
the same matrix math everywhere, instead of every item type
reinventing its own.
Shapes also gained a proper pen tool (bezier paths, corner/smooth/
symmetric nodes), arc support, and mirroring. Images gained
non-destructive cropping and colour-keyed transparency, both
remember their own settings, so reopening the dialog picks up
where you left off instead of starting over.
Properties dialogs for both were extended to match (position,
size, angle, skew), with undo/redo wired through for every handle
drag.
Old XML files can read easily as the transformation is only added
if needed and the old syntax is still used and understood if it is
not needed.
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