void DocumentCanvas::zoom(double factor, bool relativezoom, double userCenterX, double userCenterY, unsigned int deviceX, unsigned int deviceY) {
LcPainter &painter = cachedPainter(VIEWER_DOCUMENT);
if ((_zoomMax <= painter.scale() && factor > 1.) || (_zoomMin >= painter.scale() && factor < 1.)) {
return;
}
if (relativezoom) {
factor = factor * painter.scale();
}
// Calculate reference device offset at device location
painter.save();
double refX = deviceX;
double refY = deviceY;
painter.reset_transformations();
painter.scale(factor);
painter.device_to_user(&refX, &refY);
painter.restore();
// Set translation
for (auto i = _cachedPainters.begin(); i != _cachedPainters.end(); i++) {
LcPainter *p = i->second;
p->reset_transformations();
p->scale(factor);
p->translate(refX - userCenterX,-refY + userCenterY);
}
}
LcPainter& DocumentCanvas::cachedPainter(PainterCacheType cacheType) {
double s = 1.;
double x = 0.;
double y = 0.;
if (_cachedPainters.size() != 0) {
LcPainter* p = _cachedPainters.begin()->second;
s = p->scale();
p->getTranslate(&x, &y);
}
if (_cachedPainters.count(cacheType) == 0) {
_cachedPainters[cacheType] = _createPainterFunctor(_deviceWidth, _deviceHeight);
_cachedPainters[cacheType]->scale(s);
_cachedPainters[cacheType]->translate(x, y);
}
return *_cachedPainters[cacheType];
}
void DocumentCanvas::newDeviceSize(unsigned int width, unsigned int height) {
if (_deviceWidth!=width && _deviceHeight!=height) {
_deviceWidth = width;
_deviceHeight = height;
double s = 1.;
double x = 0.;
double y = 0.;
if (_cachedPainters.size() != 0) {
LcPainter* p = _cachedPainters.begin()->second;
s = p->scale();
p->getTranslate(&x, &y);
}
for (auto i = _cachedPainters.begin(); i != _cachedPainters.end(); i++) {
_deletePainterFunctor(i->second);
_cachedPainters[i->first] = _createPainterFunctor(_deviceWidth, _deviceHeight);
_cachedPainters[i->first]->scale(s);
_cachedPainters[i->first]->translate(x, y);
}
}
}
