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Fix element editor Mirror and Flip to reflect the selection in place

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Mirror (M) and Flip (F) in the element editor reflected the selected
parts across the element origin: every part's mirror() and flip()
negated the scene x or y coordinate. A part drawn to the right of the
origin landed the same distance to the left, so the selection jumped
to the other side of the canvas instead of turning around.

MirrorElementsCommand and FlipElementsCommand now compute the united
scene bounding rectangle of the selected items and reflect across the
vertical or horizontal line through its center. The center is snapped
to the nearest half of the diagram grid, so points that were on the
grid stay on the grid after the reflection. Terminals in particular
keep their grid alignment.

Each part's mirror() and flip() takes the axis coordinate as a
parameter with a default of 0, so the previous behavior remains
available to any other caller. The command stores the axis when it is
created and undo reapplies the same reflection, which is its own
inverse, so the existing undo path is unchanged.

Parts covered: PartArc, PartDynamicTextField, PartEllipse, PartLine,
PartPolygon, PartRectangle, PartTerminal, PartText.

Fixes #812
This commit is contained in:
Jeff Patterson
2026-09-06 06:48:45 -05:00
parent b98589d3c7
commit 825a1a594d
18 changed files with 104 additions and 66 deletions
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sources/editor/graphicspart/partrectangle.cpp
+4 -4
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@@ -187,11 +187,11 @@ qreal PartRectangle::rotation() const {
return qRound(m_rot * 100.0) / 100.0;
}
void PartRectangle::flip() {
void PartRectangle::flip(qreal axis_y) {
auto height = m_rect.height();
auto p1 = mapToScene(m_rect.x(),m_rect.y());
qreal x = p1.x();
qreal y = ((-1.0) * p1.y()) - height;
qreal y = 2 * axis_y - p1.y() - height;
p1 = mapFromScene(x, y);
m_rect.setX(p1.x());
m_rect.setY(p1.y());
@@ -201,10 +201,10 @@ void PartRectangle::flip() {
emit rectChanged();
}
void PartRectangle::mirror() {
void PartRectangle::mirror(qreal axis_x) {
auto width = m_rect.width();
auto p1 = mapToScene(m_rect.x(),m_rect.y());
qreal x = ((-1.0) * p1.x()) - width;
qreal x = 2 * axis_x - p1.x() - width;
qreal y = p1.y();
p1 = mapFromScene(x, y);
m_rect.setX(p1.x());