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#include "tilesphere.h"
#include "tilecache.h"
#include "tile.h"
#include <qgeometrydata.h>
#include <qglscenenode.h>
#include <qglmaterial.h>
#include <qglbuilder.h>
#include <cmath>
TileSphere::TileSphere(QObject *parent, TileCache *tileCache, int zoom, double radius)
: QObject(parent),
tileCache_(tileCache),
zoom_(zoom),
radius_(radius),
viewLimited_(false)
{
viewX1_ = 0;
viewY1_ = 0;
viewX2_ = (1 << zoom_) - 1;
viewY2_ = (1 << zoom_) - 1;
sphereNode_ = new QGLSceneNode(this);
connect(tileCache_,
SIGNAL(prefetchingFinished()),
this,
SLOT(prefetchingFinished()));
}
void TileSphere::setZoom(int zoom)
{
if (zoom_ == zoom)
return;
zoom_ = zoom;
}
int TileSphere::zoom() const
{
return zoom_;
}
void TileSphere::setRadius(double radius)
{
if (radius_ == radius)
return;
radius_ = radius;
}
double TileSphere::radius() const
{
return radius_;
}
void TileSphere::limitView(int x1, int y1, int x2, int y2)
{
viewLimited_ = true;
viewX1_ = x1;
viewY1_ = y1;
viewX2_ = x2;
viewY2_ = y2;
}
void TileSphere::clearLimit()
{
if (!viewLimited_)
return;
viewLimited_ = false;
viewX1_ = 0;
viewY1_ = 0;
viewX2_ = (1 << zoom_) - 1;
viewY2_ = (1 << zoom_) - 1;
}
QGLSceneNode* TileSphere::sphereSceneNode() const
{
return sphereNode_;
}
void TileSphere::update()
{
prefetchSphere();
tileCache_->waitForPrefetchedTiles();
}
void TileSphere::prefetchingFinished()
{
qDebug() << __FUNCTION__ << "prefetching is finished";
buildSphere();
emit sphereUpdated();
}
QGeometryData TileSphere::tileSpecToSphereQuad(int x, int y) const
{
QGeometryData data;
const double pi = 3.14159265358;
double z = 1 << zoom_;
double lon1 = 2.0 * pi * x / z;
double lon2 = 2.0 * pi * (x + 1) / z;
double lat1 = pi * y / z;
double lat2 = pi * (y + 1) / z;
double cosLat1 = cos(lat1);
double cosLat2 = cos(lat2);
double cosLon1 = cos(pi/2 - lon1);
double cosLon2 = cos(pi/2 - lon2);
double sinLat1 = sin(lat1);
double sinLat2 = sin(lat2);
double sinLon1 = sin(pi/2 - lon1);
double sinLon2 = sin(pi/2 - lon2);
// y and z are flipped here to move from
// "earth" geometry to GL geometry
QVector3D v11 = QVector3D(cosLon1 * sinLat1,
cosLat1,
sinLon1 * sinLat1);
QVector3D v12 = QVector3D(cosLon1 * sinLat2,
cosLat2,
sinLon1 * sinLat2);
QVector3D v21 = QVector3D(cosLon2 * sinLat1,
cosLat1,
sinLon2 * sinLat1);
QVector3D v22 = QVector3D(cosLon2 * sinLat2,
cosLat2,
sinLon2 * sinLat2);
data.appendVertex(radius_ * v11);
data.appendNormal(v11);
data.appendTexCoord(QVector2D(0, 1));
data.appendVertex(radius_ * v12);
data.appendNormal(v12);
data.appendTexCoord(QVector2D(0, 0));
data.appendVertex(radius_ * v22);
data.appendNormal(v22);
data.appendTexCoord(QVector2D(1, 0));
data.appendVertex(radius_ * v21);
data.appendNormal(v21);
data.appendTexCoord(QVector2D(1, 1));
return data;
}
QGLSceneNode* TileSphere::tileToSceneNode(const Tile &tile) const
{
if (tile.tileSpec().zoom() == -1)
return 0;
QGLBuilder builder;
builder.addQuads(tileSpecToSphereQuad(tile.tileSpec().x(), tile.tileSpec().y()));
QGLSceneNode *node = builder.finalizedSceneNode();
QGLMaterial *mat = new QGLMaterial(node);
QGLTexture2D *tex = new QGLTexture2D(mat);
tex->setPixmap(tile.pixmap());
mat->setTexture(tex);
node->setMaterial(mat);
node->setEffect(QGL::LitDecalTexture2D);
return node;
}
void TileSphere::prefetchSphere() const
{
int z = 1 << zoom_;
int x1 = viewX1_;
int x2 = viewX2_;
if (x2 < x1)
x2 += z;
int y1 = viewY1_;
int y2 = viewY2_;
if (y2 < y1)
y2 += z;
for (int x = x1; x <= x2; ++x) {
for (int y = y1; y <= y2; ++y) {
tileCache_->prefetch(TileSpec(zoom_, x % z, y % z));
}
}
}
void TileSphere::buildSphere() const
{
sphereNode_->removeNodes(sphereNode_->children());
int z = 1 << zoom_;
int x1 = viewX1_;
int x2 = viewX2_;
if (x2 < x1)
x2 += z;
int y1 = viewY1_;
int y2 = viewY2_;
if (y2 < y1)
y2 += z;
for (int x = x1; x <= x2; ++x) {
for (int y = y1; y <= y2; ++y) {
QGLSceneNode *node = tileToSceneNode(tileCache_->get(TileSpec(zoom_, x % z, y % z)));
if (node)
sphereNode_->addNode(node);
}
}
}
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