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Add an Arc tool and a handle to pull a half arc in or out (#408)

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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>
This commit is contained in:
ispyisail
2026-10-01 22:49:35 +13:00
parent 7fdc314e41
commit ffa76a61c1
5 changed files with 128 additions and 3 deletions
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sources/qetdiagrameditor.cpp
+6
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@@ -1048,6 +1048,7 @@ void QETDiagramEditor::setUpActions()
QAction *add_line = m_add_item_actions_group.addAction(QET::Icons::PartLine, tr("Ajouter une ligne", "Draw line"));
QAction *add_rectangle = m_add_item_actions_group.addAction(QET::Icons::PartRectangle, tr("Ajouter un rectangle"));
QAction *add_ellipse = m_add_item_actions_group.addAction(QET::Icons::PartEllipse, tr("Ajouter une ellipse"));
QAction *add_arc = m_add_item_actions_group.addAction(QET::Icons::PartArc, tr("Ajouter un arc"));
QAction *add_polyline = m_add_item_actions_group.addAction(QET::Icons::PartPolygon, tr("Ajouter une polyligne"));
QAction *add_path = m_add_item_actions_group.addAction(QET::Icons::PartBezier, tr("Ajouter une courbe"));
QAction *add_terminal_strip = m_add_item_actions_group.addAction(QET::Icons::TerminalStrip, tr("Ajouter un plan de bornes"));
@@ -1060,6 +1061,7 @@ void QETDiagramEditor::setUpActions()
add_line ->setStatusTip(tr("Ajoute une ligne sur le folio actuel"));
add_rectangle->setStatusTip(tr("Ajoute un rectangle sur le folio actuel"));
add_ellipse ->setStatusTip(tr("Ajoute une ellipse sur le folio actuel"));
add_arc ->setStatusTip(tr("Ajoute un arc sur le folio actuel"));
add_polyline ->setStatusTip(tr("Ajoute une polyligne sur le folio actuel"));
add_path ->setStatusTip(tr("Ajoute une courbe de Bézier sur le folio actuel"));
add_terminal_strip->setStatusTip(tr("Ajoute un plan de bornier sur le folio actuel"));
@@ -1072,6 +1074,7 @@ void QETDiagramEditor::setUpActions()
add_line ->setData(QStringLiteral("line"));
add_rectangle->setData(QStringLiteral("rectangle"));
add_ellipse ->setData(QStringLiteral("ellipse"));
add_arc ->setData(QStringLiteral("arc"));
add_polyline ->setData(QStringLiteral("polyline"));
add_path ->setData(QStringLiteral("path"));
add_terminal_strip->setData(QStringLiteral("terminal_strip"));
@@ -1080,6 +1083,7 @@ void QETDiagramEditor::setUpActions()
add_line->setCheckable(true);
add_rectangle->setCheckable(true);
add_ellipse->setCheckable(true);
add_arc->setCheckable(true);
add_polyline->setCheckable(true);
add_path->setCheckable(true);
@@ -2024,6 +2028,8 @@ void QETDiagramEditor::addItemGroupTriggered(QAction *action)
diagram_event = new DiagramEventAddShape (d, QetShapeItem::Rectangle);
else if (value == "ellipse")
diagram_event = new DiagramEventAddShape (d, QetShapeItem::Ellipse);
else if (value == "arc")
diagram_event = new DiagramEventAddShape (d, QetShapeItem::Ellipse, true);
else if (value == "polyline")
diagram_event = new DiagramEventAddShape (d, QetShapeItem::Polygon);
else if (value == "path")