QMatrix4x4 AffineTransform::matrix(QVector3D const& _center) const {
QMatrix4x4 _m;
_m.translate(_center);
if (translationEnabled()) _m.translate(translation_);
if (rotationEnabled()) _m *= rotation_.matrix();
if (scaleEnabled()) {
_m.scale(scale());
}
_m.translate(-_center);
return _m;
}
void QgsMapCanvas::setRotation( double degrees )
{
if ( !rotationEnabled() )
return;
double current = rotation();
if ( degrees == current )
return;
mSettings.setRotation( degrees );
emit rotationChanged( degrees );
emit extentsChanged(); // visible extent changes with rotation
// notify canvas items of change (needed?)
updateCanvasItemPositions();
} // setRotation
