/**
* Tablet events are handled here
* @param event event info
*/
bool CanvasView::viewportEvent(QEvent *event)
{
if(event->type() == QEvent::TabletMove) {
// Stylus moved
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
const dpcore::Point point(mapToScene(tabev->pos()), tabev->pressure());
if(!_prevpoint.intSame(point)) {
if(_isdragging)
moveDrag(tabev->x(), tabev->y());
else {
if(_pendown) {
if(point.pressure()==0) {
// Missed a release event
_pendown = NOTDOWN;
onPenUp();
} else {
onPenMove(point);
}
}
updateOutline(point);
}
_prevpoint = point;
}
} else if(event->type() == QEvent::TabletPress) {
// Stylus touches the tablet surface
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
if(_dragbtndown) {
startDrag(tabev->x(), tabev->y(), _dragbtndown);
} else {
if(_pendown == NOTDOWN) {
const dpcore::Point point(mapToScene(tabev->pos()), tabev->pressure());
_pendown = TABLETDOWN;
onPenDown(point, false);
updateOutline(point);
_prevpoint = point;
}
}
} else if(event->type() == QEvent::TabletRelease) {
// Stylus lifted
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
if(_isdragging) {
stopDrag();
} else if(_pendown == TABLETDOWN) {
dpcore::Point point(mapToScene(tabev->pos()), 0);
updateOutline(point);
_prevpoint = point;
_pendown = NOTDOWN;
onPenUp();
}
} else {
return QGraphicsView::viewportEvent(event);
}
return true;
}
/**
* Tablet events are handled here
* @param event event info
*/
bool EditorView::viewportEvent(QEvent *event)
{
if(event->type() == QEvent::TabletMove) {
// Stylus moved
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
const dpcore::Point point(mapToScene(tabev->pos()), tabev->pressure());
if(!prevpoint_.intSame(point)) {
if(isdragging_)
moveDrag(tabev->x(), tabev->y());
else {
if(pendown_) {
if(point.pressure()==0) {
// Missed a release event
pendown_ = NOTDOWN;
emit penUp();
} else {
emit penMove(point);
}
}
updateOutline(point);
}
prevpoint_ = point;
}
} else if(event->type() == QEvent::TabletPress) {
// Stylus touches the tablet surface
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
if(dragbtndown_) {
startDrag(tabev->x(), tabev->y(), dragbtndown_);
} else {
if(pendown_ == NOTDOWN) {
const dpcore::Point point(mapToScene(tabev->pos()), tabev->pressure());
pendown_ = TABLETDOWN;
emit penDown(point);
updateOutline(point);
prevpoint_ = point;
}
}
} else if(event->type() == QEvent::TabletRelease) {
// Stylus lifted
QTabletEvent *tabev = static_cast<QTabletEvent*>(event);
tabev->accept();
if(isdragging_) {
stopDrag();
} else if(pendown_ == TABLETDOWN) {
dpcore::Point point(mapToScene(tabev->pos()), 0);
updateOutline(point);
prevpoint_ = point;
pendown_ = NOTDOWN;
emit penUp();
}
} else {
return QGraphicsView::viewportEvent(event);
}
return true;
}
/**
* Convert a dpcore::Point to network format. The
* reverse operation for this is in statetracker.cpp
* @param p
* @return
*/
protocol::PenPoint pointToProtocol(const dpcore::Point &p)
{
// The two least significant bits of the coordinate
// are the fractional part.
// The rest is the integer part with a bias of 128
uint16_t x = (qMax(0, p.x() + 128) << 2) | (uint16_t(p.xFrac()*4) & 3);
uint16_t y = (qMax(0, p.y() + 128) << 2) | (uint16_t(p.yFrac()*4) & 3);
return protocol::PenPoint(x, y, p.pressure() * 255);
}
/**
* @param point stroke coordinates to send
*/
void SessionState::sendStrokePoint(const dpcore::Point& point)
{
host_->sendPacket(protocol::StrokePoint(
host_->localuser_,
point.x(),
point.y(),
point.xFrac(),
point.yFrac(),
qRound(point.pressure()*255)
)
);
}
/**
* @param from point from which the line begins
* @param to point at which the line ends
* @param brush brush to draw the line with
*/
void Preview::preview(const dpcore::Point& from, const dpcore::Point& to, const dpcore::Brush& brush)
{
brush_ = brush;
from_ = from;
to_ = to;
const int rad = brush.radius(to.pressure());
QColor color = brush.color(to.pressure());
QPen pen;
if(rad==0) {
pen.setWidth(1);
color.setAlphaF(brush.opacity(to.pressure()));
} else {
pen.setWidth(rad*2);
pen.setCapStyle(Qt::RoundCap);
pen.setJoinStyle(Qt::RoundJoin);
// Approximate brush transparency
const qreal a = brush.opacity(to.pressure()) * rad * (1-brush.spacing()/100.0);
color.setAlphaF(qMin(a, 1.0));
}
pen.setColor(color);
initAppearance(pen);
}