/*!
\internal
*/
void QGeoMapPolygonGeometry::updateScreenPoints(const QGeoMap &map)
{
if (!screenDirty_)
return;
if (map.width() == 0 || map.height() == 0) {
clear();
return;
}
QPointF origin = map.coordinateToScreenPosition(srcOrigin_, false);
// Create the viewport rect in the same coordinate system
// as the actual points
QRectF viewport(0, 0, map.width(), map.height());
viewport.translate(-1 * origin);
QPainterPath vpPath;
vpPath.addRect(viewport);
QPainterPath ppi;
if (clipToViewport_)
ppi = srcPath_.intersected(vpPath); // get the clipped version of the path
else ppi = srcPath_;
clear();
// a polygon requires at least 3 points;
if (ppi.elementCount() < 3)
return;
// Intersection between the viewport and a concave polygon can create multiple polygons
// joined by a line at the viewport border, and poly2tri does not triangulate this very well
// so use the full src path if the resulting polygon is concave.
if (clipToViewport_) {
int changeInX = 0;
int changeInY = 0;
QPainterPath::Element e1 = ppi.elementAt(1);
QPainterPath::Element e = ppi.elementAt(0);
QVector2D edgeA(e1.x - e.x ,e1.y - e.y);
for (int i = 2; i <= ppi.elementCount(); ++i) {
e = ppi.elementAt(i % ppi.elementCount());
if (e.x == e1.x && e.y == e1.y)
continue;
QVector2D edgeB(e.x - e1.x, e.y - e1.y);
if ((edgeA.x() < 0) == (edgeB.x() >= 0))
changeInX++;
if ((edgeA.y() < 0) == (edgeB.y() >= 0))
changeInY++;
edgeA = edgeB;
e1 = e;
}
if (changeInX > 2 || changeInY > 2) // polygon is concave
ppi = srcPath_;
}
// translate the path into top-left-centric coordinates
QRectF bb = ppi.boundingRect();
ppi.translate(-bb.left(), -bb.top());
firstPointOffset_ = -1 * bb.topLeft();
ppi.closeSubpath();
screenOutline_ = ppi;
std::vector<p2t::Point*> curPts;
curPts.reserve(ppi.elementCount());
for (int i = 0; i < ppi.elementCount(); ++i) {
const QPainterPath::Element e = ppi.elementAt(i);
if (e.isMoveTo() || i == ppi.elementCount() - 1
|| (qAbs(e.x - curPts.front()->x) < 0.1
&& qAbs(e.y - curPts.front()->y) < 0.1)) {
if (curPts.size() > 2) {
p2t::CDT *cdt = new p2t::CDT(curPts);
cdt->Triangulate();
std::vector<p2t::Triangle*> tris = cdt->GetTriangles();
screenVertices_.reserve(screenVertices_.size() + int(tris.size()));
for (size_t i = 0; i < tris.size(); ++i) {
p2t::Triangle *t = tris.at(i);
for (int j = 0; j < 3; ++j) {
p2t::Point *p = t->GetPoint(j);
screenVertices_ << Point(p->x, p->y);
}
}
delete cdt;
}
curPts.clear();
curPts.reserve(ppi.elementCount() - i);
curPts.push_back(new p2t::Point(e.x, e.y));
} else if (e.isLineTo()) {
curPts.push_back(new p2t::Point(e.x, e.y));
} else {
qWarning("Unhandled element type in polygon painterpath");
}
}
if (curPts.size() > 0) {
qDeleteAll(curPts.begin(), curPts.end());
curPts.clear();
}
screenBounds_ = ppi.boundingRect();
}
/*!
\internal
*/
void QGeoMapPolylineGeometry::updateScreenPoints(const QGeoMap &map,
qreal strokeWidth)
{
if (!screenDirty_)
return;
QPointF origin = map.coordinateToScreenPosition(srcOrigin_, false).toPointF();
if (!qIsFinite(origin.x()) || !qIsFinite(origin.y())) {
clear();
return;
}
// Create the viewport rect in the same coordinate system
// as the actual points
QRectF viewport(0, 0, map.width(), map.height());
viewport.adjust(-strokeWidth, -strokeWidth, strokeWidth, strokeWidth);
viewport.translate(-1 * origin);
// Perform clipping to the viewport limits
QVector<qreal> points;
QVector<QPainterPath::ElementType> types;
if (clipToViewport_) {
clipPathToRect(srcPoints_, srcPointTypes_, viewport, points, types);
} else {
points = srcPoints_;
types = srcPointTypes_;
}
QVectorPath vp(points.data(), types.size(), types.data());
QTriangulatingStroker ts;
ts.process(vp, QPen(QBrush(Qt::black), strokeWidth), viewport, QPainter::Qt4CompatiblePainting);
clear();
// Nothing is on the screen
if (ts.vertexCount() == 0)
return;
// QTriangulatingStroker#vertexCount is actually the length of the array,
// not the number of vertices
screenVertices_.reserve(ts.vertexCount());
screenOutline_ = QPainterPath();
QPolygonF tri;
const float *vs = ts.vertices();
for (int i = 0; i < (ts.vertexCount()/2*2); i += 2) {
screenVertices_ << QPointF(vs[i], vs[i + 1]);
if (!qIsFinite(vs[i]) || !qIsFinite(vs[i + 1]))
break;
tri << QPointF(vs[i], vs[i + 1]);
if (tri.size() == 4) {
tri.remove(0);
screenOutline_.addPolygon(tri);
}
}
QRectF bb = screenOutline_.boundingRect();
screenBounds_ = bb;
this->translate( -1 * sourceBounds_.topLeft());
}
/*!
\internal
*/
void QGeoMapCircleGeometry::updateScreenPointsInvert(const QGeoMap &map)
{
if (!screenDirty_)
return;
if (map.width() == 0 || map.height() == 0) {
clear();
return;
}
QPointF origin = map.coordinateToItemPosition(srcOrigin_, false).toPointF();
QPainterPath ppi = srcPath_;
clear();
// a circle requires at least 3 points;
if (ppi.elementCount() < 3)
return;
// translate the path into top-left-centric coordinates
QRectF bb = ppi.boundingRect();
ppi.translate(-bb.left(), -bb.top());
firstPointOffset_ = -1 * bb.topLeft();
ppi.closeSubpath();
// calculate actual width of map on screen in pixels
QGeoCoordinate mapCenter(0, map.cameraData().center().longitude());
QDoubleVector2D midPoint = map.coordinateToItemPosition(mapCenter, false);
QDoubleVector2D midPointPlusOne = QDoubleVector2D(midPoint.x() + 1.0, midPoint.y());
QGeoCoordinate coord1 = map.itemPositionToCoordinate(midPointPlusOne, false);
double geoDistance = coord1.longitude() - map.cameraData().center().longitude();
if ( geoDistance < 0 )
geoDistance += 360.0;
double mapWidth = 360.0 / geoDistance;
qreal leftOffset = origin.x() - (map.width()/2.0 - mapWidth/2.0) - firstPointOffset_.x();
qreal topOffset = origin.y() - (midPoint.y() - mapWidth/2.0) - firstPointOffset_.y();
QPainterPath ppiBorder;
ppiBorder.moveTo(QPointF(-leftOffset, -topOffset));
ppiBorder.lineTo(QPointF(mapWidth - leftOffset, -topOffset));
ppiBorder.lineTo(QPointF(mapWidth - leftOffset, mapWidth - topOffset));
ppiBorder.lineTo(QPointF(-leftOffset, mapWidth - topOffset));
screenOutline_ = ppiBorder;
std::vector<p2t::Point*> borderPts;
borderPts.reserve(4);
std::vector<p2t::Point*> curPts;
curPts.reserve(ppi.elementCount());
for (int i = 0; i < ppi.elementCount(); ++i) {
const QPainterPath::Element e = ppi.elementAt(i);
if (e.isMoveTo() || i == ppi.elementCount() - 1
|| (qAbs(e.x - curPts.front()->x) < 0.1
&& qAbs(e.y - curPts.front()->y) < 0.1)) {
if (curPts.size() > 2) {
for (int j = 0; j < 4; ++j) {
const QPainterPath::Element e2 = ppiBorder.elementAt(j);
borderPts.push_back(new p2t::Point(e2.x, e2.y));
}
p2t::CDT *cdt = new p2t::CDT(borderPts);
cdt->AddHole(curPts);
cdt->Triangulate();
std::vector<p2t::Triangle*> tris = cdt->GetTriangles();
screenVertices_.reserve(screenVertices_.size() + int(tris.size()));
for (size_t i = 0; i < tris.size(); ++i) {
p2t::Triangle *t = tris.at(i);
for (int j = 0; j < 3; ++j) {
p2t::Point *p = t->GetPoint(j);
screenVertices_ << QPointF(p->x, p->y);
}
}
delete cdt;
}
curPts.clear();
curPts.reserve(ppi.elementCount() - i);
curPts.push_back(new p2t::Point(e.x, e.y));
} else if (e.isLineTo()) {
curPts.push_back(new p2t::Point(e.x, e.y));
} else {
qWarning("Unhandled element type in circle painterpath");
}
}
if (curPts.size() > 0) {
qDeleteAll(curPts.begin(), curPts.end());
curPts.clear();
}
if (borderPts.size() > 0) {
qDeleteAll(borderPts.begin(), borderPts.end());
borderPts.clear();
}
screenBounds_ = ppiBorder.boundingRect();
}
