void EditPolygonTool::startMoving()
{
// Move only the clicked handle, if it was not part of the selection
if (!mSelectedHandles.contains(mClickedHandle))
setSelectedHandle(mClickedHandle);
mMode = Moving;
MapRenderer *renderer = mapDocument()->renderer();
// Remember the current object positions
mOldHandlePositions.clear();
mOldPolygons.clear();
mAlignPosition = renderer->screenToPixelCoords((*mSelectedHandles.begin())->pos());
const auto &selectedHandles = mSelectedHandles;
for (PointHandle *handle : selectedHandles) {
const QPointF pos = renderer->screenToPixelCoords(handle->pos());
mOldHandlePositions.append(handle->pos());
if (pos.x() < mAlignPosition.x())
mAlignPosition.setX(pos.x());
if (pos.y() < mAlignPosition.y())
mAlignPosition.setY(pos.y());
MapObject *mapObject = handle->mapObject();
if (!mOldPolygons.contains(mapObject))
mOldPolygons.insert(mapObject, mapObject->polygon());
}
}
void EditPolygonTool::updateMovingItems(const QPointF &pos,
Qt::KeyboardModifiers modifiers)
{
MapRenderer *renderer = mapDocument()->renderer();
QPointF diff = pos - mStart;
SnapHelper snapHelper(renderer, modifiers);
if (snapHelper.snaps()) {
const QPointF alignScreenPos = renderer->pixelToScreenCoords(mAlignPosition);
const QPointF newAlignScreenPos = alignScreenPos + diff;
QPointF newAlignPixelPos = renderer->screenToPixelCoords(newAlignScreenPos);
snapHelper.snap(newAlignPixelPos);
diff = renderer->pixelToScreenCoords(newAlignPixelPos) - alignScreenPos;
}
const auto &selectedHandles = mSelectedHandles;
int i = 0;
for (PointHandle *handle : selectedHandles) {
// update handle position
const QPointF newScreenPos = mOldHandlePositions.at(i) + diff;
handle->setPos(newScreenPos);
// calculate new pixel position of polygon node
const MapObjectItem *item = handle->mapObjectItem();
const QPointF newInternalPos = item->mapFromScene(newScreenPos);
const QPointF newScenePos = item->pos() + newInternalPos;
const QPointF newPixelPos = renderer->screenToPixelCoords(newScenePos);
// update the polygon
MapObject *mapObject = item->mapObject();
QPolygonF polygon = mapObject->polygon();
polygon[handle->pointIndex()] = newPixelPos - mapObject->position();
mapDocument()->mapObjectModel()->setObjectPolygon(mapObject, polygon);
++i;
}
}